{"id":2164,"date":"2016-08-01T00:00:52","date_gmt":"2016-07-31T15:00:52","guid":{"rendered":"https:\/\/micronix-jp.com\/?p=2164"},"modified":"2023-07-28T17:53:24","modified_gmt":"2023-07-28T08:53:24","slug":"dsrc-dbmeirp_e","status":"publish","type":"post","link":"https:\/\/micronix-jp.com\/english\/note\/application\/dsrc-dbmeirp_e.html","title":{"rendered":"About dBmeirp that is unit of electric field strength used in ETC\/DSRC"},"content":{"rendered":"<div class=\"wp-block-vk-blocks-table-of-contents-new vk_tableOfContents vk_tableOfContents-style-default tabs\"><div class=\"tab\"><div class=\"vk_tableOfContents_title\">\u76ee\u6b21<\/div><input type=\"checkbox\" id=\"chck1\"\/><label class=\"tab-label vk_tableOfContents_openCloseBtn button_status button_status-close\" for=\"chck1\"><\/label><ul class=\"vk_tableOfContents_list tab_content-close\"><li class=\"vk_tableOfContents_list_item vk_tableOfContents_list_item-h-2\" data-reactroot=\"\"><a href=\"#vk-htags-d301eca5-b733-49f2-a6c3-e1bef15b3aba\" class=\"vk_tableOfContents_list_item_link\"><span class=\"vk_tableOfContents_list_item_link_preNumber\">1. <\/span>Application<\/a><\/li><li class=\"vk_tableOfContents_list_item vk_tableOfContents_list_item-h-2\" data-reactroot=\"\"><a href=\"#vk-htags-ec986bd2-5f2e-43d3-b92e-06590c476fcb\" class=\"vk_tableOfContents_list_item_link\"><span class=\"vk_tableOfContents_list_item_link_preNumber\">2. <\/span>System configuration<\/a><\/li><li class=\"vk_tableOfContents_list_item vk_tableOfContents_list_item-h-2\" data-reactroot=\"\"><a href=\"#vk-htags-30410e53-f25b-49b1-be47-aaebece0a1e2\" class=\"vk_tableOfContents_list_item_link\"><span class=\"vk_tableOfContents_list_item_link_preNumber\">3. <\/span>Products introduction<\/a><\/li><\/ul><\/div><\/div><h2 class=\"wp-block-heading\" id=\"vk-htags-d301eca5-b733-49f2-a6c3-e1bef15b3aba\">Application<\/h2><p>In the ETC\/DSRC system, the unit of electric field strength is specified as dBmeirp as described in ARIB STD-75, which is a standard for dedicated short range communication (DSRC) system. Therefore, dBmeirp is used as the unit of electric field strength in DSRC communication unit ME9115 and ETC\/ITS spot electric field strength measurement system ME9200 which are our products.<\/p><p>V\/m or \u03bcV\/m (dBV\/m or dB\u03bcV\/m in the case of dB expression) is generally used as the unit of electric field strength. The relationship between these units will be explained.<\/p><p>As a preliminary step to explain this relationship, the relationship between these units and antenna gain (absolute gain) and antenna factor used for field strength measurement will be explained. \"eirp\" in dBmeirp means equivalent isotropic radiant power. The electric field strength (dBmeirp) is obtained by subtracting the antenna gain (dBi) from the output power (dBm) of the receiving antenna.<\/p><p>The expression is as follows.<\/p><p class=\"has-large-font-size\"><strong>The electric field strength (dBmeirp) \uff1d The output power (dBm) \uff0d The antenna gain (dBi) \u2026(1)<\/strong><\/p><p>As the gain increases, the output power also increases.<\/p><p>Therefore, for example, when the receiving antenna with a gain of 2dBi is connected to the spectrum analyzer and measured to be -38dBm, the electric field strength at the surface of antenna is -40dBmeirp. (The cable loss between the receiving antenna and the spectrum analyzer is assumed to be zero for simplicity.)<\/p><p>On the other hand, when the electric field strength (dB\u03bcV\/m) is also expressed as described above, the antenna factor (dB\/m) is added to the output voltage (dB\u03bcv) of the receiving antenna.<\/p><p>The expression is as follows.<\/p><p class=\"has-large-font-size\"><strong>The electric field strength (dB\u03bcV\/m) \uff1d The output voltage (dB\u03bcv) \uff0d The antenna factor (dB\/m) \u2026(2)<\/strong><\/p><p>As the antenna factor increases, the output voltage decreases.<\/p><p>Therefore, for example, when the receiving antenna with an antenna factor of 44dB\/m is connected to the spectrum analyzer and measured to be 68.5dB\u03bcV, the electric field strength at the surface of antenna is 112.5dB\u03bcV\/m. (The cable loss between the receiving antenna and the spectrum analyzer is assumed to be zero for simplicity.)<\/p><p>When the measurement is carried out with 50\u03a9 impedance, the following expression is obtained.<\/p><p class=\"has-large-font-size\"><strong>The output voltage (dB\u03bcv) \uff1d The output power (dBm) + 107 (dB) \u2026(3)<\/strong><\/p><p>Also, if 50\u03a9 impedance and radio wave frequency 5.81GHz, the following expression is obtained.<\/p><p class=\"has-large-font-size\"><strong>The output voltage (dB\u03bcv) \uff1d The output power (dBm) + 107 (dB) \u2026(3)<\/strong><\/p><p>From the expressions of (1), (2), (3) and (4), the following expression is obtained.<br><\/p><p class=\"has-large-font-size\"><strong>The electric field strength (dB\u03bcV\/m) \uff1d The electric field strength (dBmeirp) + 152.5(db\/m) (@5.81GHz)<br>{ =The output power(dBm) + 107(dB) + 45.5(dB\/m) - The antenna gain(dBi) }<\/strong><\/p><h2 class=\"vk_block-margin-lg--margin-top wp-block-heading\" id=\"vk-htags-ec986bd2-5f2e-43d3-b92e-06590c476fcb\">System configuration<\/h2><figure class=\"wp-block-flexible-table-block-table is-content-justification-left\"><table class=\"\"><tbody><tr><td><a href=\"\/english\/products\/etc\/me9115.html\">DSRC communication unit ME9115<\/a><\/td><td>\u00d71<\/td><\/tr><tr><td colspan=\"2\" style=\"text-align:center\">or<\/td><\/tr><tr><td><a href=\"\/english\/products\/etc\/me9200.html\">ETC \/ ITS spot electric field strength measurement system ME9200 <\/a><\/td><td>\u00d71<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"vk_block-margin-lg--margin-top wp-block-heading\" id=\"vk-htags-30410e53-f25b-49b1-be47-aaebece0a1e2\">Products introduction<\/h2><div class=\"wp-block-vk-blocks-select-post-list vk_posts vk_posts-postType-post vk_posts-layout-card-noborder vk_postList\"><div id=\"post-6016\" class=\"vk_post vk_post-postType-product card card-noborder vk_post-col-xs-12 vk_post-col-sm-6 vk_post-col-md-3 vk_post-col-lg-3 vk_post-col-xl-3 vk_post-col-xxl-3 post-2164 post type-post status-publish format-standard has-post-thumbnail hentry category-category-note tag-app-emc tag-app-knowledge tag-market-wireless-communication tag-application-etc\"><div class=\"vk_post_imgOuter\" style=\"background-image:url(https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9115_640x640.png)\"><a href=\"https:\/\/micronix-jp.com\/english\/products\/etc\/me9115.html\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9115_640x640-300x300.png\" class=\"vk_post_imgOuter_img card-img-top wp-post-image\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9115_640x640-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9115_640x640-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9115_640x640-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9115_640x640.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div><!-- [ \/.vk_post_imgOuter ] --><div class=\"vk_post_body card-body\"><h5 class=\"vk_post_title card-title\"><a href=\"https:\/\/micronix-jp.com\/english\/products\/etc\/me9115.html\">DSRC Communication Unit ME9115<\/a><\/h5><p class=\"vk_post_excerpt card-text\">Making it possible to read WCN of OBE and to measure electric field strength of OBE and RSU.<\/p><\/div><!-- [ \/.card-body ] --><\/div><!-- [ \/.card ] -->\n\n<div id=\"post-6021\" class=\"vk_post vk_post-postType-product card card-noborder vk_post-col-xs-12 vk_post-col-sm-6 vk_post-col-md-3 vk_post-col-lg-3 vk_post-col-xl-3 vk_post-col-xxl-3 post-2164 post type-post status-publish format-standard has-post-thumbnail hentry category-category-note tag-app-emc tag-app-knowledge tag-market-wireless-communication tag-application-etc\"><div class=\"vk_post_imgOuter\" style=\"background-image:url(https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9200_640x640.png)\"><a href=\"https:\/\/micronix-jp.com\/english\/products\/etc\/me9200.html\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9200_640x640-300x300.png\" class=\"vk_post_imgOuter_img card-img-top wp-post-image\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9200_640x640-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9200_640x640-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9200_640x640-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/me9200_640x640.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div><!-- [ \/.vk_post_imgOuter ] --><div class=\"vk_post_body card-body\"><h5 class=\"vk_post_title card-title\"><a href=\"https:\/\/micronix-jp.com\/english\/products\/etc\/me9200.html\">ETC \/ ITS Spot Electric Field Strength Measurement System ME9200<\/a><\/h5><p class=\"vk_post_excerpt card-text\">ME9200 makes possible to measure the electric field strength of the signal radiated from ETC or ITS spot in a short time. With this system, after measuring the electric field strength distribution of the ETC\/ITS spot with operation wave or CW in a short time, the electric field strength graph and the map diagram are created.<\/p><\/div><!-- [ \/.card-body ] --><\/div><!-- [ \/.card ] --><\/div><p><\/p><div class=\"wp-block-vk-blocks-button vk_button vk_button-color-custom vk_button-4c37ff1f-27c6-4110-815a-720c947e4058 vk_button-align-block\"><a href=\"\/eng\/file-download\/application\/pdf\/DSRC-dBmeirp_e.pdf\" class=\"vk_button_link btn has-background btn-lg btn-block\" role=\"button\" aria-pressed=\"true\" target=\"_blank\" rel=\"noopener\"><div class=\"vk_button_link_caption\"><i class=\"fas fa-file-pdf vk_button_link_before\" aria-hidden=\"true\"><\/i><span class=\"vk_button_link_txt\">Download This Application Note (PDF)<\/span><\/div><\/a><\/div><style type=\"text\/css\">.vk_button-4c37ff1f-27c6-4110-815a-720c947e4058 .has-background {\n\t\t\t\tbackground-color: #5b6069;\n\t\t\t\tborder: 1px solid #5b6069;\n\t\t\t} <\/style><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>In the ETC\/DSRC system, the unit of electric field strength is specified as dBmeirp as described in ARIB STD-75, which is a standard for dedicated short range communication (DSRC) system. Therefore, dBmeirp is used as the unit of electric field strength in DSRC communication unit ME9115 and ETC\/ITS spot electric field strength measurement system ME9200 which are our products.<\/p>\n","protected":false},"author":1,"featured_media":9538,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"vkexunit_cta_each_option":"","footnotes":""},"categories":[17],"tags":[44,47,68,69],"class_list":["post-2164","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-category-note","tag-app-emc","tag-app-knowledge","tag-market-wireless-communication","tag-application-etc"],"_links":{"self":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2164","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=2164"}],"version-history":[{"count":12,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2164\/revisions"}],"predecessor-version":[{"id":9539,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2164\/revisions\/9539"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/media\/9538"}],"wp:attachment":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/media?parent=2164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/categories?post=2164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/tags?post=2164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}