{"id":2265,"date":"2015-03-01T00:00:54","date_gmt":"2015-02-28T15:00:54","guid":{"rendered":"https:\/\/micronix-jp.com\/?p=2265"},"modified":"2023-03-20T17:19:22","modified_gmt":"2023-03-20T08:19:22","slug":"field_uniformity","status":"publish","type":"post","link":"https:\/\/micronix-jp.com\/english\/note\/application\/field_uniformity.html","title":{"rendered":"Wideband field uniformity in anechoic box"},"content":{"rendered":"<p class=\"bigTitle\" style=\"margin-bottom: 1em\">Wideband anechoic box suitable for development of multi-band\/UWB radio system or EMC evaluation<\/p>\n\n\n<h2>Application<\/h2>\n<p> Demand on launching wideband radio test environment for development of multi-band\/UWB radio system or EMC evaluation at low cost has became to increase. Such environment using anechoic box contributes to reduce initial cost of launching and shorten TAT(turn around time) by debugging easily a product to be tested. <\/p>\n\n\n\n<h2>Solution<\/h2>\n<p> Wideband anechoic box with high uniformity inside, consisting of shield box and wave absorber with suitable properties, is offered. <\/p>\n<p>The following is an example that electric field at each of four points in a vertical plane of the distance 0.6 m from a transmitting antenna in an anechoic box was measured by a electric field probe. <\/p>\n<ul class=\"flexBox flexBoxDivide\">\n<li>\n<h3>Conditions<\/h3>\n<span style=\"font-weight: bold\">Measurement frequency band<\/span>\n<ul>\n<li>1GHz to 6GHz<\/li>\n<\/ul>\n<span style=\"font-weight: bold\">Anechoic box<\/span>\n<ul>\n<li>Size\uff1a about 1m x 1m x 1m<\/li>\n<li>Shielding effect\uff1a more than 60 dB @ 2.4 GHz<\/li>\n<li>Pyramid-type wave absorber\uff08Reflectivity\uff1a-20 dB @ more than 1.5 GHz)<\/li>\n<\/ul>\n<span style=\"font-weight: bold\">Transmitting antenna<\/span>\n<ul>\n<li>LPDA(Log PeriodicAntenna)<br>\n[Calculation method of electric field strength(cal_E)]<\/li>\n<li>Electric field strength is calculated from antenna input power, antenna gain(typ) and attenuation in free space.<\/li>\n<\/ul>\n<\/li>\n<li> <img loading=\"lazy\" decoding=\"async\" src=\"\/eng\/image\/application\/field_uniformity-00.gif\" alt=\"Figure:An image of anechoic box inside\" width=\"400\" height=\"271\" class=\"right\" style=\"margin-left:1em\"> <\/li>\n<\/ul>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/eng\/image\/application\/field_uniformity-01.gif\" alt=\"Graph:Measured electric field in an anechoic box\" width=\"730\" height=\"441\">\n<p>In above figure, variation of measured electric field at each point is within \u00b115 % at the frequencies over 1.5 GHz. <\/p>\n<p>Also, good agreement of the calculated and the measured shows that anechoic box inside is similar to free space in a wide band. <\/p>\n\n\n\n<h2>System configuration<\/h2>\n<table>\n<tbody>\n<tr>\n<th nowrap=\"\">Example<\/th>\n<\/tr>\n<tr>\n<td><a href=\"\/english\/products\/spectrum-analyzer\/msa500\/msa558.html\">Signal analyzer [MSA558]<\/a><\/td>\n<\/tr>\n<tr>\n<td><a href=\"\/english\/products\/shield-box\/\">Electromagnetic anechoic box<\/a><\/td>\n<\/tr>\n<tr>\n<td>Transmitting\/Receiving antenna<\/td>\n<\/tr>\n<tr>\n<td>Jigs to mount antenna and EUT<\/td>\n<\/tr>\n<tr>\n<td>Others(PC, I\/F modules, cables, etc)<\/td>\n<\/tr>\n<\/tbody>\n<tfoot>\n<\/tfoot>\n<\/table>\n\n\n\n<h2>Products introduction<\/h2>\n<div class=\"woocommerce columns-3 \"><\/div><div class=\"wp-block-vk-blocks-button vk_button vk_button-color-custom vk_button-align-block\"><a href=\"\/eng\/file-download\/application\/pdf\/field_uniformity_e.pdf\" style=\"background-color:#5b6069;border:1px solid #5b6069;color:#fff;\" class=\"vk_button_link btn btn-md btn-block white\" role=\"button\" aria-pressed=\"true\" target=\"_blank\"  rel=\"noopener\"><i class=\"fas vk_button_link_before fa-file-pdf\"><\/i><span class=\"vk_button_link_txt\">Download This Application Note (PDF) <\/span><\/a><\/div><p><\/p><div class=\"wp-block-cover is-light vk_block-margin-xl--margin-top\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-white-background-color has-background-dim\"><\/span><img class=\"wp-block-cover__image-background wp-image-8105\" alt=\"\" src=\"https:\/\/micronix-jp.com\/wp-content\/uploads\/2022\/11\/contact_cta_cover.png\" data-object-fit=\"cover\"\/><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\"><p class=\"has-text-align-center has-huge-font-size\"><strong>Please feel free to contact us.<\/strong><\/p>\n\n<p>If you want to verify 5G, customize a radio wave shield box, or need product repair, please do not hesitate to contact us about any small matter.<\/p>\n\n<div class=\"wp-block-vk-blocks-grid-column vk_gridColumn\"><div class=\"row\"><div class=\"wp-block-vk-blocks-grid-column-item vk_gridColumn_item col-12 col-sm-12 col-md-12 col-lg-12 col-xl-12 col-xxl-12\"><div class=\"wp-block-vk-blocks-button vk_button vk_button-color-custom vk_button-align-block is-style-shine\"><a href=\"https:\/\/micronix-jp.com\/english\/contact\/\" class=\"vk_button_link btn has-background has-luminous-vivid-orange-background-color btn-lg btn-block\" role=\"button\" aria-pressed=\"true\" target=\"_blank\" rel=\"noopener\"><div class=\"vk_button_link_caption\"><i class=\"far fa-envelope vk_button_link_before\" aria-hidden=\"true\"><\/i><span class=\"vk_button_link_txt\"><strong>Contact Form<\/strong><\/span><\/div><\/a><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Wideband anechoic box suitable for development of multi-band\/UWB radio system or EMC evaluation Application Demand on launching wideband radio test environment for development of multi-band\/UWB radio system or EMC evaluation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8206,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"vkexunit_cta_each_option":"","footnotes":""},"categories":[17],"tags":[36,44,58,68,73,75],"class_list":["post-2265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-category-note","tag-app-4g-5g","tag-app-emc","tag-app-uwb","tag-market-wireless-communication","tag-application-shield-box","tag-application-spectrum-analyzer"],"_links":{"self":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2265","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/comments?post=2265"}],"version-history":[{"count":1,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2265\/revisions"}],"predecessor-version":[{"id":7036,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2265\/revisions\/7036"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/media\/8206"}],"wp:attachment":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/media?parent=2265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/categories?post=2265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/tags?post=2265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}