{"id":20774,"date":"2023-03-16T09:56:16","date_gmt":"2023-03-16T09:56:16","guid":{"rendered":"https:\/\/proxim.com\/?page_id=20774"},"modified":"2023-03-23T17:56:46","modified_gmt":"2023-03-23T17:56:46","slug":"fresnel-clearance-zone","status":"publish","type":"page","link":"https:\/\/proxim.com\/fr\/products\/network-tools\/online-calculators\/fresnel-clearance-zone\/","title":{"rendered":"Online Calculators: Fresnel Clearance Zone"},"content":{"rendered":"<header class=\"main_h fixedElement\">\n<div class=\"row-secondary__menu\">\n<div><a class=\"p-menu\" href=\"https:\/\/proxim.com\/fr\/products\/network-tools\/online-calculators\/\">Online Calculators<\/a><\/div>\n<div class=\"bx--menu__datasheet\">\n<div id=\"menu_datasheet\">\n<ul class=\"nav-menu\">\n<li><a href=\"https:\/\/proxim.com\/how-to-buy\/\" target=\"_blank\" rel=\"noopener\">How to Buy<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/header>\n<div id=\"sticky-placeholder\">\n<div class=\"navigation-branding\"><\/div>\n<\/div>\n<div class=\"content-main-wt\">\n<div id=\"contect-section\" class=\"clearfix\">\n<div class=\"pxm\">\n<div class=\"grid-box\">\n<div class=\"grid-item-two solutions\">\n<div class=\"cs-text-block pxm-solutions\">\n<div class=\"pr-big-heading\">\n<h1 class=\"padtb10\">Definition &amp; Calculation of Fresnel Clearance Zone<\/h1>\n<\/div>\n<div class=\"product-t-sec pad-null\">\n<div class=\"cs-content pr-text-blk\">\n<div class=\"product-t-sec padtb\">\n<h3 class=\"patbt-pr\">What is Fresnel Zone?<\/h3>\n<p class=\"solutions-i subtext-cs\">Unlike the popular view of a Line of Sight which a clear unobstructed clear straight line. Radio frequency line of sight is defined by Fresnel Zones which are   ellipse shaped areas between any two radios. The primary Fresnel zone is required to be at least 60% clear of any obstruction to ensure the highest performance of wireless link.<\/p>\n<div class=\"cs-content\"><img decoding=\"async\" src=\"\/scripts\/calculators\/what-is-fresnel-zone.jpg\" alt=\"What is Fresnel Zone?\" title=\"What is Fresnel Zone?\"><\/div>\n<p class=\"solutions-i\">The radius of the <i class=\"style\">Fresnel Zone<\/i> at its widest point can be calculated by<br \/>\nthe formula listed below, where <b><i>d<\/i><\/b> is the link distance in Kilometers, <b><i>f<\/i><\/b> is the frequency<br \/>\nin GHz, and <b><i>r<\/i><\/b> is the radius off of the center line of the link in feet. For further information<br \/>\non this formula, please <a href=\"#example\">review the figure below<\/a>.<\/p>\n<p class=\"solutions-i subtext-cs\"><span class=\"cs-customer\">Note: <\/span>The final value represents a first order approximation and should only be used as a guide. No guarantees or warranties are implied accordingly.<\/p>\n<div class=\"cs-content\"><\/div>\n<p><a name=\"example\"><\/a><\/p>\n<h3 class=\"padtso\">Fresnel Zone Example<\/h3>\n<div class=\"cs-content\"><img decoding=\"async\" alt=\"Fresnel Zone\" title=\"Fresnel Zone\" src=\"\/scripts\/calculators\/fresnelzone.jpg\"><\/div>\n<div class=\"cs-content padbz\">\n<p class=\"subtext-cs padbz padbz-i\"><span class=\"cs-customer\">Notes:<\/span><\/p>\n<ul class=\"stl-disc-p\">\n<li>The <strong>Fresnel Zone<\/strong> is the area around the visual line-of-sight that radio waves spread out into after they leave the antenna. You want a clear line of sight to maintain signal strength, especially for 2.4 GHz wireless systems. This is because 2.4 GHz waves are absorbed by water, like the water found in trees.<\/li>\n<li>Typically, 20% <b class=\"bold\">Fresnel Zone<\/b> blockage introduces little signal loss to the link. Beyond 40% blockage, signal loss will become significant.<\/li>\n<li>This calculation is based on a <i>flat earth<\/i>. It does not take the curvature of the earth into consideration. The effect of this is to <i>budge<\/i> the earth in the middle of the link. It is recommended for long links to have a microwave path analysis done that takes this and the topography of the terrain into account.<\/li>\n<li>The formula for determining the radius of the widest point of the fresnel zone <em>(in meters)<\/em> is:<br \/>\n<strong>17.32 * square root of (<em>d<\/em>\/4<em>f)<\/em><\/strong><br \/>\nwhere <strong><em>d<\/em><\/strong> is the distance <em>(in kilometers)<\/em> between the two antennas and <strong><em>f<\/em><\/strong> is the frequency <em>(in GHz)<\/em> at which you are transmitting.<\/li>\n<li>The formula for determining the radius of the widest point of the fresnel zone <em>(in feet)<\/em> is:<br \/>\n<strong>72.05 * square root of (<em>d<\/em>\/4<em>f)<\/em><\/strong><br \/>\nwhere <strong><em>d<\/em><\/strong> is the distance <em>(in miles)<\/em> between the two antennas and <strong><em>f<\/em><\/strong> is<br \/>\nthe frequency <em>(in GHz)<\/em> at which you are transmitting.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Online Calculators How to Buy Definition &amp; Calculation of Fresnel Clearance Zone What is Fresnel Zone? Unlike the popular view of a Line of Sight which a clear unobstructed clear straight line. Radio frequency line of sight is defined by Fresnel Zones which are ellipse shaped areas between any two radios. The primary Fresnel zone [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":20755,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-20774","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.5 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Online Calculators: Fresnel Clearance Zone - Proxim Wireless<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/proxim.com\/products\/network-tools\/online-calculators\/fresnel-clearance-zone\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Online Calculators: Fresnel Clearance Zone\" \/>\n<meta property=\"og:description\" content=\"Online Calculators How to Buy Definition &amp; Calculation of Fresnel Clearance Zone What is Fresnel Zone? 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