{"id":2025,"date":"2019-12-08T15:20:35","date_gmt":"2019-12-08T14:20:35","guid":{"rendered":"https:\/\/www.electronic-service.de\/electronic-service-wp\/products\/absorber\/narrow-band-flat-absorber\/"},"modified":"2025-11-24T03:32:36","modified_gmt":"2025-11-24T02:32:36","slug":"narrow-band-absorbers","status":"publish","type":"page","link":"https:\/\/www.electronic-service.de\/en\/products\/hf-absorber\/narrow-band-absorbers\/","title":{"rendered":"Narrowband flat absorber"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1jb5iev-f11cc30e14a3731354764cbfa982bd05\">\n.avia-section.av-k1jb5iev-f11cc30e14a3731354764cbfa982bd05{\nbackground-repeat:no-repeat;\nbackground-image:url(https:\/\/www.electronic-service.de\/electronic-service-wp\/wp-content\/uploads\/2019\/10\/ES-Absorber_Schmalbandflachabsorber.jpg);\nbackground-position:50% 50%;\nbackground-attachment:scroll;\n}\n.avia-section.av-k1jb5iev-f11cc30e14a3731354764cbfa982bd05 .av-section-color-overlay{\nopacity:0.5;\nbackground-color:#ffffff;\n}\n<\/style>\n<div id='av_section_1'  class='avia-section av-k1jb5iev-f11cc30e14a3731354764cbfa982bd05 main_color avia-section-default avia-no-border-styling  avia-builder-el-0  el_before_av_section  avia-builder-el-first  av-mini-hide avia-full-stretch avia-bg-style-scroll av-section-color-overlay-active av-minimum-height av-minimum-height-custom av-height-custom  container_wrap sidebar_right'  data-section-bg-repeat='stretch' data-av_minimum_height_px='280'><div class=\"av-section-color-overlay-wrap\"><div class=\"av-section-color-overlay\"><\/div><div class='container av-section-cont-open' style='height:280px'><main  role=\"main\" itemprop=\"mainContentOfPage\"  class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-2025'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894\">\n#top .av-special-heading.av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894{\nmargin:20px 0 0 0;\npadding-bottom:10px;\ncolor:#004687;\n}\nbody .av-special-heading.av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894 .special-heading-inner-border{\nborder-color:#004687;\n}\n.av-special-heading.av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894 .av-subheading{\nfont-size:15px;\n}\n\n@media only screen and (min-width: 768px) and (max-width: 989px){ \n#top #wrap_all .av-special-heading.av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894 .av-special-heading-tag{\nfont-size:28px;\n}\n}\n\n@media only screen and (min-width: 480px) and (max-width: 767px){ \n#top #wrap_all .av-special-heading.av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894 .av-special-heading-tag{\nfont-size:28px;\n}\n}\n<\/style>\n<div  class='av-special-heading av-ke8dl27t-27b9fd8f4ada80b919fa64a1e95d0894 av-special-heading-h1 custom-color-heading blockquote modern-quote  avia-builder-el-1  avia-builder-el-no-sibling  av-linked-heading'><h1 class='av-special-heading-tag'  itemprop=\"headline\"  >Narrow-band absorbers &#8211; attenuate with millimeter precision, secure signals <\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<\/div><\/div><\/main><!-- close content main element --><\/div><\/div><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1jb5iev-8-3c8efee97d8caa491e8503c030215ea4\">\n.avia-section.av-k1jb5iev-8-3c8efee97d8caa491e8503c030215ea4{\nbackground-repeat:no-repeat;\nbackground-image:url(https:\/\/www.electronic-service.de\/electronic-service-wp\/wp-content\/uploads\/2019\/10\/ES-Absorber_Schmalbandflachabsorber.jpg);\nbackground-position:100% 50%;\nbackground-attachment:scroll;\n}\n.avia-section.av-k1jb5iev-8-3c8efee97d8caa491e8503c030215ea4 .av-section-color-overlay{\nopacity:0.6;\nbackground-color:#ffffff;\n}\n<\/style>\n<div id='av_section_2'  class='avia-section av-k1jb5iev-8-3c8efee97d8caa491e8503c030215ea4 main_color avia-section-small avia-no-border-styling  avia-builder-el-2  el_after_av_section  el_before_av_one_full  av-desktop-hide av-medium-hide av-small-hide avia-full-stretch avia-bg-style-scroll av-section-color-overlay-active av-minimum-height av-minimum-height-custom av-height-custom  container_wrap sidebar_right'  data-section-bg-repeat='stretch' data-av_minimum_height_px='120'><div class=\"av-section-color-overlay-wrap\"><div class=\"av-section-color-overlay\"><\/div><div class='container av-section-cont-open' style='height:120px'><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-2025'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m4tilcb5-2c047f2fa2894b28aa43a487ec675849\">\n#top .av_textblock_section.av-m4tilcb5-2c047f2fa2894b28aa43a487ec675849 .avia_textblock{\nfont-size:24px;\ncolor:#004687;\ntext-align:center;\n}\n<\/style>\n<section  class='av_textblock_section av-m4tilcb5-2c047f2fa2894b28aa43a487ec675849 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock mobile-title av_inherit_color'  itemprop=\"text\" ><p>NARROWBAND FLAT ABSORBER<\/p>\n<\/div><\/section>\n<\/div><\/div><\/div><!-- close content main div --><\/div><\/div><\/div><div id='after_section_2'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-2025'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-9199d-ddb1a74d9efa5f4bb9fead4e2ae0865e\">\n.flex_column.av-9199d-ddb1a74d9efa5f4bb9fead4e2ae0865e{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-9199d-ddb1a74d9efa5f4bb9fead4e2ae0865e av_one_full  avia-builder-el-4  el_after_av_section  el_before_av_one_full  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><section  class='av_textblock_section av-typx-16570e409f832c6f128210ed7ea15de7 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Narrow-band flat absorbers from the <strong>ESorb FTA series<\/strong> attenuate a narrow frequency window &#8211; typically <strong>-20 dB<\/strong> at 24 GHz or 77 GHz. Developed and manufactured under ISO 9001 \/ 14001, they stand for reproducible quality, minimum weight and fast availability in custom-made sizes. Without an intact, precisely tuned narrowband absorber, echo peaks, falsified measurement data and EMC limit violations occur &#8211; this delays test procedures, jeopardizes approvals and, in the worst case, leads to expensive recalls.<\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mcvya-0a26fbefe029758a387dbf289b18a6aa\">\n.flex_column.av-mcvya-0a26fbefe029758a387dbf289b18a6aa{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-mcvya-0a26fbefe029758a387dbf289b18a6aa av_one_full  avia-builder-el-6  el_after_av_one_full  el_before_av_one_full  first flex_column_div av-zero-column-padding  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1mcya-2fb820dfee2f7bef92c4cf74aa288df5\">\n#top .av-special-heading.av-1mcya-2fb820dfee2f7bef92c4cf74aa288df5{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-1mcya-2fb820dfee2f7bef92c4cf74aa288df5 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-1mcya-2fb820dfee2f7bef92c4cf74aa288df5 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-1mcya-2fb820dfee2f7bef92c4cf74aa288df5 av-special-heading-h2 blockquote modern-quote  avia-builder-el-7  el_before_av_textblock  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Precision on one frequency &#8211; what makes the narrowband absorber so special?<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-9zvw2-a2fb1ec21ca29df6a658f821768268c4 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>A narrowband absorber is the first choice when a single, critical frequency needs to be shielded. It offers an effective solution where space, weight or budget are limited &#8211; and scores points over broadband alternatives thanks to its slim design.<\/p>\n<p>That&#8217;s what sets him apart:<\/p>\n<ul>\n<li>Resonance-optimized flat absorber based on silicone or urethane &#8211; ideal for frequency-specific applications<\/li>\n<li>Typical thickness from 1.0 mm &#8211; perfect for compact radar modules or tight installation spaces<\/li>\n<li>Tested: up to -20 dB reflection attenuation at the target resonance frequency (f\u2080), e.g. in the 77 GHz range<\/li>\n<\/ul>\n<p>A quick adjustment of the target frequency is all it takes &#8211; we match the material and thickness exactly to it.<\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-xbhyy-4668442cae95cf48c3f2c5c9e2880d83\">\n.flex_column.av-xbhyy-4668442cae95cf48c3f2c5c9e2880d83{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-xbhyy-4668442cae95cf48c3f2c5c9e2880d83 av_one_full  avia-builder-el-9  el_after_av_one_full  el_before_av_one_full  first flex_column_div av-zero-column-padding  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdstrjxh-a6f8913ca3f8495428e803ac527009fb\">\n#top .av-special-heading.av-mdstrjxh-a6f8913ca3f8495428e803ac527009fb{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdstrjxh-a6f8913ca3f8495428e803ac527009fb .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdstrjxh-a6f8913ca3f8495428e803ac527009fb .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdstrjxh-a6f8913ca3f8495428e803ac527009fb av-special-heading-h2 blockquote modern-quote  avia-builder-el-10  el_before_av_textblock  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >How ESorb material works &#8211; resonance meets high-tech foam<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdstra27-3b628f16f2906713c0e49ff000aab109 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Thanks to defined permittivity and magnetic particles, the <strong>magnetic absorber layer<\/strong>can absorb the field energy and dissipate it as heat.<\/p>\n<ul>\n<li>Dielectric Absorber Foam (ARC technology) from the USA as the base material.<\/li>\n<li>Optional magnetic impregnation for increased basic damping.<\/li>\n<li>Silicone version FTA-S withstands continuous temperatures of up to 170 \u00b0C.<\/li>\n<\/ul>\n<p>We thus combine precise resonance tuning with robust automotive suitability.<\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-quboi-8d24e54368443576ab6974b004624a36\">\n.flex_column.av-quboi-8d24e54368443576ab6974b004624a36{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-quboi-8d24e54368443576ab6974b004624a36 av_one_full  avia-builder-el-12  el_after_av_one_full  el_before_av_hr  first flex_column_div av-zero-column-padding  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdstrs7b-4d3a5b483a3161d3d4a7f7d4491570ad\">\n#top .av-special-heading.av-mdstrs7b-4d3a5b483a3161d3d4a7f7d4491570ad{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdstrs7b-4d3a5b483a3161d3d4a7f7d4491570ad .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdstrs7b-4d3a5b483a3161d3d4a7f7d4491570ad .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdstrs7b-4d3a5b483a3161d3d4a7f7d4491570ad av-special-heading-h2 blockquote modern-quote  avia-builder-el-13  el_before_av_textblock  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Characteristic values that convince &#8211; flat absorber data at a glance<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdstryi5-535dab7b29ac218fa747de02d3bfc664 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Performance data at a glance &#8211; so that your EMC simulation remains reliable:<\/p>\n<ul>\n<li>Reflection: <strong>-20 dB @ f\u2080,<\/strong> harmonics mostly<\/li>\n<li>Density: &lt;100 kg\/m\u00b3 \u2192 Weight advantage over ferrite plates.<\/li>\n<li>Temperature window: -55 \u00b0C&#8230;+170 \u00b0C.<\/li>\n<li>Production: Water jet, cutting plotter, punching &#8211; all in-house.<\/li>\n<\/ul>\n<p>You can find more options in our <a class=\"hyperlink\" href=\"https:\/\/www.electronic-service.de\/en\/products\/hf-absorber\/\" rel=\"noreferrer noopener\"><strong>HF absorber<\/strong><\/a>-overview.<\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1khpjff-d558012bdc4b457d98e509bc3c8a34d3\">\n#top .hr.hr-invisible.av-k1khpjff-d558012bdc4b457d98e509bc3c8a34d3{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-k1khpjff-d558012bdc4b457d98e509bc3c8a34d3 hr-invisible  avia-builder-el-15  el_after_av_one_full  el_before_av_one_full '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-9199d-7-5b146008db69dc7263a76f6ff63d2209\">\n.flex_column.av-9199d-7-5b146008db69dc7263a76f6ff63d2209{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\nbackground-color:#2c76ae;\n}\n<\/style>\n<div  class='flex_column av-9199d-7-5b146008db69dc7263a76f6ff63d2209 av_one_full  avia-builder-el-16  el_after_av_hr  el_before_av_hr  first flex_column_div av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-typx-6-7b432e51cd7907d14ed02279b9e49d67\">\n#top .av_textblock_section.av-typx-6-7b432e51cd7907d14ed02279b9e49d67 .avia_textblock{\ncolor:#ffffff;\n}\n<\/style>\n<section  class='av_textblock_section av-typx-6-7b432e51cd7907d14ed02279b9e49d67 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p style=\"text-align: center;\">NARROWBAND FLAT ABSORBER<\/p>\n<\/div><\/section><br \/>\n<div class='avia-data-table-wrap av-62oy2x-b6d4580a577bc588d5d2c649fa9c8e9f avia_scrollable_table avia-table-1'><table  class='avia-table avia-data-table avia_pricing_default  avia-builder-el-18  el_after_av_textblock  avia-builder-el-last '  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/Table\" ><tbody><tr class=''><th class='avia-desc-col'><\/th><td class=''>Basic material<\/td><td class=''>Operating temperature (\u00b0C)<\/td><td class=''>Technical data sheets<\/td><\/tr><tr class=''><th class='avia-desc-col'>esorb FTA<\/th><td class=''>Polyurethane<\/td><td class=''>120 C\u00b0<\/td><td class=''>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1ki7a5x-f273dd4a5ac90f8acc95bcab9e1d16a3\">\n.av_font_icon.av-k1ki7a5x-f273dd4a5ac90f8acc95bcab9e1d16a3{\ncolor:#333333;\nborder-color:#333333;\n}\n.av_font_icon.av-k1ki7a5x-f273dd4a5ac90f8acc95bcab9e1d16a3 .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-k1ki7a5x-f273dd4a5ac90f8acc95bcab9e1d16a3 avia_animate_when_visible av-icon-style- avia-icon-pos-center avia-icon-animate'><a href='https:\/\/www.electronic-service.de\/electronic-service-wp\/wp-content\/uploads\/2019\/11\/ES-Electronic-Service-Datenblatt-ESORB-FTA-mit-Graph-Neu.pdf'   class='av-icon-char' aria-hidden='true' data-av_icon='\ue84b' data-av_iconfont='entypo-fontello' data-avia-icon-tooltip=\"&lt;br \/&gt;\nDownload Data Sheet&lt;br \/&gt;\n\"><\/a><\/span><\/td><\/tr><tr class=''><th class='avia-desc-col'>esorb FTA-S<\/th><td class=''>Silicone<\/td><td class=''>170 C\u00b0<\/td><td class=''>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1ki7a5x-3-a65591ea09eebdb2c9af2877af899736\">\n.av_font_icon.av-k1ki7a5x-3-a65591ea09eebdb2c9af2877af899736{\ncolor:#333333;\nborder-color:#333333;\n}\n.av_font_icon.av-k1ki7a5x-3-a65591ea09eebdb2c9af2877af899736 .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-k1ki7a5x-3-a65591ea09eebdb2c9af2877af899736 avia_animate_when_visible av-icon-style- avia-icon-pos-center avia-icon-animate'><a href='https:\/\/www.electronic-service.de\/electronic-service-wp\/wp-content\/uploads\/2019\/11\/ES-Electronic-Service-Datenblatt-ESORB-FTA-mit-Graph-Neu.pdf'   class='av-icon-char' aria-hidden='true' data-av_icon='\ue84b' data-av_iconfont='entypo-fontello' data-avia-icon-tooltip=\"&lt;br \/&gt;\nDownload Data Sheet&lt;br \/&gt;\n\"><\/a><\/span><\/td><\/tr><\/tbody><\/table><\/div><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1khpjff-5-20a25bc01e0db34d2e6beb150c781455\">\n#top .hr.hr-invisible.av-k1khpjff-5-20a25bc01e0db34d2e6beb150c781455{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-k1khpjff-5-20a25bc01e0db34d2e6beb150c781455 hr-invisible  avia-builder-el-21  el_after_av_one_full  el_before_av_one_full '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-js3oa-1fa690295aa241613509d54ab28c7aea\">\n.flex_column.av-js3oa-1fa690295aa241613509d54ab28c7aea{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-js3oa-1fa690295aa241613509d54ab28c7aea av_one_full  avia-builder-el-22  el_after_av_hr  el_before_av_one_full  first flex_column_div av-zero-column-padding  '     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdsts6sc-7f6ba137d5b4d53abf6766b38ed0a2f3\">\n#top .av-special-heading.av-mdsts6sc-7f6ba137d5b4d53abf6766b38ed0a2f3{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdsts6sc-7f6ba137d5b4d53abf6766b38ed0a2f3 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdsts6sc-7f6ba137d5b4d53abf6766b38ed0a2f3 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdsts6sc-7f6ba137d5b4d53abf6766b38ed0a2f3 av-special-heading-h2 blockquote modern-quote  avia-builder-el-23  el_before_av_textblock  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Applications &#8211; where narrowband absorbers are important<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdstsebm-a5349667fd1820bd436865970f171ba4 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>From the bumper of a premium SUV to the 5G transmission mast on the roof of a high-rise building: narrowband absorbers solve reflection problems wherever individual radar or radio bands limit system performance. In the automotive industry, they ensure constant distance measurements and reduce interference emissions in accordance with CISPR 25. Telecom operators use the lightweight foam to minimize self-reflections in millimetre-wave small cells and thus stabilize network quality in city centres. Space and satcom manufacturers benefit from the low weight and reproducible -20 dB attenuation to reliably meet link budgets in orbit.<\/p>\n<p>A brief overview of why developers choose them:<\/p>\n<ol>\n<li>Radar sensors in ADAS and <em>autonomous driving<\/em> &#8211; interference-free distance measurement.<\/li>\n<li>EMC measurement boxes for hardware-in-the-loop tests &#8211; reproducible DUT environment.<\/li>\n<li>Antenna covers for 5G small cells &#8211; less self-reflection.<\/li>\n<li>Satcom filter housing &#8211; clean link budget measurement.<\/li>\n<\/ol>\n<p>For broader spectra we recommend <a class=\"hyperlink\" href=\"https:\/\/www.electronic-service.de\/en\/products\/hf-absorber\/broadband-absorbers\/\" rel=\"noreferrer noopener\"><strong>broadband flat absorbers<\/strong><\/a>for volume resonances <a class=\"hyperlink\" href=\"https:\/\/www.electronic-service.de\/en\/products\/hf-absorber\/cavity-absorbers\/\" rel=\"noreferrer noopener\"><strong>cavity absorbers<\/strong><\/a>.<\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-fi58i-ecc01ffc939006d029ff056a5df2e235\">\n.flex_column.av-fi58i-ecc01ffc939006d029ff056a5df2e235{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-fi58i-ecc01ffc939006d029ff056a5df2e235 av_one_full  avia-builder-el-25  el_after_av_one_full  el_before_av_one_full  first flex_column_div av-zero-column-padding  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdstsp0g-5eda67e335d6b10228f217bbed1c5d11\">\n#top .av-special-heading.av-mdstsp0g-5eda67e335d6b10228f217bbed1c5d11{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdstsp0g-5eda67e335d6b10228f217bbed1c5d11 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdstsp0g-5eda67e335d6b10228f217bbed1c5d11 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdstsp0g-5eda67e335d6b10228f217bbed1c5d11 av-special-heading-h2 blockquote modern-quote  avia-builder-el-26  el_before_av_textblock  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Quick selection &#8211; how to find the right damper<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdstsvac-7f8628182f44f0f0e701bf008b119cc2 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Our experts check five parameters:<\/p>\n<ul>\n<li>Target frequency &amp; bandwidth<\/li>\n<li>Installation space &amp; maximum permissible thickness<\/li>\n<li>Temperature cycle<\/li>\n<li>Desired attenuation (dB)<\/li>\n<li>Quantity &amp; delivery date<\/li>\n<\/ul>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdsttip7-f3faa3d95039ad4d69f22b06a9d7a664\">\n#top .av-special-heading.av-mdsttip7-f3faa3d95039ad4d69f22b06a9d7a664{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdsttip7-f3faa3d95039ad4d69f22b06a9d7a664 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdsttip7-f3faa3d95039ad4d69f22b06a9d7a664 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdsttip7-f3faa3d95039ad4d69f22b06a9d7a664 av-special-heading-h3 blockquote modern-quote  avia-builder-el-28  el_after_av_textblock  el_before_av_textblock  av-linked-heading'><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >Long-standing partnership with ABS Technics &#8211; European production at the highest level.<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdsttcbi-bc528650f5ee656ea74bbc00dad3bdfc '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Our joint engineering enables short development cycles and resilient prototypes.<\/p>\n<p>ABS Technics is ISO 9001 certified and provides complete test reports.<\/p>\n<p>This means you receive special dimensions and small series without compromising on damping performance or delivery dates.<\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1kg7wpo-5d68a98c920d025ae9856d5b98895d5a\">\n.flex_column.av-k1kg7wpo-5d68a98c920d025ae9856d5b98895d5a{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:30px 30px 30px 30px;\nbackground-color:#f4f4f4;\n}\n<\/style>\n<div  class='flex_column av-k1kg7wpo-5d68a98c920d025ae9856d5b98895d5a av_one_full  avia-builder-el-30  el_after_av_one_full  el_before_av_one_full  first flex_column_div avia-full-stretch  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20\">\n#top .av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20{\npadding-bottom:5px;\ncolor:#004687;\nfont-size:35px;\n}\nbody .av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n#top #wrap_all .av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 .av-special-heading-tag{\nfont-size:35px;\n}\n.av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 .special-heading-inner-border{\nborder-color:#004687;\n}\n.av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 .av-subheading{\nfont-size:15px;\n}\n\n@media only screen and (min-width: 480px) and (max-width: 767px){ \n#top #wrap_all .av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 .av-special-heading-tag{\nfont-size:0.8em;\n}\n}\n\n@media only screen and (max-width: 479px){ \n#top #wrap_all .av-special-heading.av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 .av-special-heading-tag{\nfont-size:0.8em;\n}\n}\n<\/style>\n<div  class='av-special-heading av-b6sn6-268b7c3602f1148f7d8b9732b8d16b20 av-special-heading-h2 custom-color-heading blockquote modern-quote  avia-builder-el-31  el_before_av_textblock  avia-builder-el-first  av-inherit-size av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Get advice now: <\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-typx-4-ada40a3370a7581ae2c485f4ad068585 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Request samples or project support &#8211; <a href=\"https:\/\/www.electronic-service.de\/en\/#kontakt\">get in touch <\/a>.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k1khpjff-2-3ad746a9f3d6e2dadb50d94e0eefcc89\">\n#top .hr.hr-invisible.av-k1khpjff-2-3ad746a9f3d6e2dadb50d94e0eefcc89{\nheight:15px;\n}\n<\/style>\n<div  class='hr av-k1khpjff-2-3ad746a9f3d6e2dadb50d94e0eefcc89 hr-invisible  avia-builder-el-33  el_after_av_textblock  el_before_av_contact '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<form action=\"https:\/\/www.electronic-service.de\/en\/products\/hf-absorber\/narrow-band-absorbers\/\" method=\"post\" data-fields-with-error=\"Found errors in the following field(s):\" class=\"avia_ajax_form av-form-labels-visible   avia-builder-el-34  el_after_av_hr  el_before_av_textblock   \" data-avia-form-id=\"1\" data-avia-redirect='' ><h3 class=''>Product inquiry for:<\/h3><fieldset><p class='  first_form  form_element form_element_half' id='element_avia_1_1'><input  name=\"avia_1_1\" class=\"input_checkbox \" type=\"checkbox\" id=\"avia_1_1\" value=\"true\"\/><label class=\"input_checkbox_label\" for=\"avia_1_1\">esorb FTA<\/label><\/p><p class='  form_element form_element_half' id='element_avia_2_1'><input  name=\"avia_2_1\" class=\"input_checkbox \" type=\"checkbox\" id=\"avia_2_1\" value=\"true\"\/><label class=\"input_checkbox_label\" for=\"avia_2_1\">esorb FTA-S<\/label><\/p><p class='  first_form  form_element form_element_third' id='element_avia_3_1'><label for=\"avia_3_1\">Name<\/label> <input name=\"avia_3_1\" class=\"text_input \" type=\"text\" id=\"avia_3_1\" value=\"\" \/><\/p><p class='  form_element form_element_third' id='element_avia_4_1'><label for=\"avia_4_1\">Company<\/label> <input name=\"avia_4_1\" class=\"text_input \" type=\"text\" id=\"avia_4_1\" value=\"\" \/><\/p><p class='  form_element form_element_third' id='element_avia_5_1'><label for=\"avia_5_1\">E\u2011mail <abbr class=\"required\" title=\"required\">*<\/abbr><\/label> <input name=\"avia_5_1\" class=\"text_input is_email\" type=\"text\" id=\"avia_5_1\" value=\"\" \/><\/p><p class='  first_form  form_element form_fullwidth' id='element_avia_6_1'><label for=\"avia_6_1\" class=\"textare_label hidden textare_label_avia_6_1\">Message<\/label><textarea  name=\"avia_6_1\" class=\"text_area \" cols=\"40\" rows=\"7\" id=\"avia_6_1\" ><\/textarea><\/p><p class=\"hidden\"><input type=\"text\" name=\"avia_7_1\" class=\"hidden \" id=\"avia_7_1\" value=\"\" \/><\/p><p class='   form_element form_fullwidth' id='element_avia_8_1'><span class='value_verifier_label'>3 + 1 = ?<\/span><input name=\"avia_8_1_verifier\" type=\"hidden\" id=\"avia_8_1_verifier\" value=\"317417373\"\/><label for=\"avia_8_1\">Bitte l&ouml;sen Sie die Gleichung. Diese Ma\u00dfnahme dient der Abwehr von Spam <abbr class=\"required\" title=\"required\">*<\/abbr><\/label><input name=\"avia_8_1\" class=\"text_input captcha\" type=\"text\" id=\"avia_8_1\" value=\"\"\/><\/p><p class=\"form_element \"><input type=\"hidden\" value=\"1\" name=\"avia_generated_form1\" \/><input type=\"submit\" value=\"Send request\" class=\"button\"  data-sending-label=\"Sending\"\/><\/p><\/fieldset><\/form><div id=\"ajaxresponse_1\" class=\"ajaxresponse ajaxresponse_1 hidden\"><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-typx-1-abdb6446d110da8a21f0775fa9af4218\">\n#top .av_textblock_section.av-typx-1-abdb6446d110da8a21f0775fa9af4218 .avia_textblock{\nfont-size:14px;\n}\n<\/style>\n<section  class='av_textblock_section av-typx-1-abdb6446d110da8a21f0775fa9af4218 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Information on the processing of your personal data can be found in our privacy policy. <a href=\"https:\/\/www.electronic-service.de\/en\/privacy-notice\/\">Privacy Notice<\/a>.<\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-bu78i-7a68d445656144124174804a0aff84c0\">\n.flex_column.av-bu78i-7a68d445656144124174804a0aff84c0{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-bu78i-7a68d445656144124174804a0aff84c0 av_one_full  avia-builder-el-36  el_after_av_one_full  el_before_av_postcontent  avia-builder-el-last  first flex_column_div av-zero-column-padding  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdstvzoq-945d00cdbd6bcdcdb637d02f4c04ce1f\">\n#top .av-special-heading.av-mdstvzoq-945d00cdbd6bcdcdb637d02f4c04ce1f{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdstvzoq-945d00cdbd6bcdcdb637d02f4c04ce1f .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdstvzoq-945d00cdbd6bcdcdb637d02f4c04ce1f .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdstvzoq-945d00cdbd6bcdcdb637d02f4c04ce1f av-special-heading-h2 blockquote modern-quote  avia-builder-el-37  el_before_av_heading  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >FAQ &#8211; Answers for development teams<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdsu0b25-e3ad76a9bdd6223077a222f9aee3227b\">\n#top .av-special-heading.av-mdsu0b25-e3ad76a9bdd6223077a222f9aee3227b{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdsu0b25-e3ad76a9bdd6223077a222f9aee3227b .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdsu0b25-e3ad76a9bdd6223077a222f9aee3227b .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdsu0b25-e3ad76a9bdd6223077a222f9aee3227b av-special-heading-h3 blockquote modern-quote  avia-builder-el-38  el_after_av_heading  el_before_av_textblock  av-linked-heading'><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >How is the resonant frequency set?<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdsu0fya-b633fbbb16a02ba64184384da3f06ea9 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Our engineers first model permittivity and magnetic loss factors in RF simulation tools, then vary layer thickness and fill level, produce laboratory coupons and adjust the recipe until the test report consistently confirms -20 dB reflection at your target frequency &#8211; reliably and reproducibly.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdsu0pf4-9408182650b033e464482eaa9cdb3b21\">\n#top .av-special-heading.av-mdsu0pf4-9408182650b033e464482eaa9cdb3b21{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdsu0pf4-9408182650b033e464482eaa9cdb3b21 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdsu0pf4-9408182650b033e464482eaa9cdb3b21 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdsu0pf4-9408182650b033e464482eaa9cdb3b21 av-special-heading-h3 blockquote modern-quote  avia-builder-el-40  el_after_av_textblock  el_before_av_textblock  av-linked-heading'><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >Can the absorber reliably attenuate 77 GHz radar in the car?<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdsu1gwn-2675ad4df4bcdebede2e085f3e238b6b '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Yes, the silicone version ESorb FTA-S has been specially validated for automotive radar: -20 dB at 77 GHz with an installation height of just three millimeters, vibration-resistant, salt spray-resistant and thermally stable up to 170 \u00b0C &#8211; ideal for front radar in bumpers.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdsu0udn-62924f2ed291be6dfcfecbe0eb69622c\">\n#top .av-special-heading.av-mdsu0udn-62924f2ed291be6dfcfecbe0eb69622c{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdsu0udn-62924f2ed291be6dfcfecbe0eb69622c .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdsu0udn-62924f2ed291be6dfcfecbe0eb69622c .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdsu0udn-62924f2ed291be6dfcfecbe0eb69622c av-special-heading-h3 blockquote modern-quote  avia-builder-el-42  el_after_av_textblock  el_before_av_textblock  av-linked-heading'><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >Why is a broadband absorber not enough here?<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdsu1pcx-763e6e7a9357ea17bdf5fc0597bd2723 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>Broadband absorbers provide a moderate basic attenuation over a wide spectrum, but if you need maximum reflection suppression in a narrow radar or satcom band, a tuned narrowband absorber achieves considerably lower attenuation values &#8211; and also saves material, weight and costs.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mdsu2ca5-954c6639b06972381370221e57a4fbb4\">\n#top .av-special-heading.av-mdsu2ca5-954c6639b06972381370221e57a4fbb4{\npadding-bottom:5px;\n}\nbody .av-special-heading.av-mdsu2ca5-954c6639b06972381370221e57a4fbb4 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mdsu2ca5-954c6639b06972381370221e57a4fbb4 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mdsu2ca5-954c6639b06972381370221e57a4fbb4 av-special-heading-h3 blockquote modern-quote  avia-builder-el-44  el_after_av_textblock  el_before_av_textblock  av-linked-heading'><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >Which standards are relevant?<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-mdsu1zav-147bae0b1e3162adfdbd03157666ac69 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p>For vehicle radar, CISPR 25 (emitted interference) and ISO 11452-4 (immunity) are particularly relevant; in the aerospace environment, RTCA DO-160 and ISO 9228 apply to radomes. Our absorbers are tested and documented in accordance with these specifications.<\/p>\n<\/div><\/section><\/p><\/div>\n\n\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":2003,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2025","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Narrow-Band HF Absorbers | Electronic Service<\/title>\n<meta name=\"description\" content=\"Flexible absorbers with high frequency-specific performance tuned to your needs. 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