{"id":17271,"date":"2026-06-03T18:13:26","date_gmt":"2026-06-03T12:43:26","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=17271"},"modified":"2026-06-03T18:13:27","modified_gmt":"2026-06-03T12:43:27","slug":"working-principle-and-radiation-pattern-of-a-j-pole-antenna","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\/","title":{"rendered":"Working Principle and Radiation Pattern of a J-Pole Antenna"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/gzTuF_F0lRk?si=h7Aa80tLUTw1YpCQ\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">The J-Pole antenna is a popular, practical, and highly efficient omnidirectional antenna. At its core, it is an <strong>end-fed half-wave dipole<\/strong> that uses a clever impedance-matching trick to connect to standard coaxial cable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is a breakdown of how it works and how it radiates your signal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. The Working Principle: Impedance Matching<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The fundamental challenge of an end-fed half-wave antenna is that the end of a half-wave wire has a very high impedance (often between 2,000 to 3,000 ohms). Standard radio equipment and coaxial cables operate at a low impedance of 50 ohms. If you connect 50-ohm coax directly to a 3,000-ohm antenna, most of your RF energy will reflect back to the radio, resulting in a terrible Standing Wave Ratio (SWR).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The J-Pole solves this by adding a <strong>quarter-wave shorted matching stub<\/strong> (the &#8220;hook&#8221; of the J).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is how the sections function together:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Radiator (Top Section):<\/strong> This is a half-wavelength (\u03bb\/2) piece of wire or tubing. It is the part of the antenna that actually radiates the RF energy into the air.<\/li>\n\n\n\n<li><strong>The Matching Stub (Bottom Section):<\/strong> This is a quarter-wavelength (\u03bb\/4) transmission line that is shorted at the very bottom.\n<ul class=\"wp-block-list\">\n<li>At the <strong>shorted bottom<\/strong>, the voltage is zero and the current is maximized, meaning the impedance is nearly <strong>0 ohms<\/strong>.<\/li>\n\n\n\n<li>At the <strong>open top<\/strong> of this stub (where it connects to the radiator), the voltage is high and current is low, meaning the impedance is <strong>thousands of ohms<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>The Feedpoint:<\/strong> Because the impedance of the matching stub smoothly rises from 0 ohms at the bottom to thousands of ohms at the top, there is a specific &#8220;sweet spot&#8221; slightly up from the shorted base where the impedance is exactly <strong>50 ohms<\/strong>. You attach your coaxial feedline (center conductor to the main element, shield to the shorter stub) exactly at this point to achieve a perfect 1:1 match.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. The Radiation Pattern<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The J-Pole is an excellent choice for local, line-of-sight communications (like VHF\/UHF operations) because of how it shapes the RF energy.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Azimuth Plane (Horizontal):<\/strong> Looking down at the antenna from above, the radiation pattern is <strong>omnidirectional<\/strong>. It radiates energy nearly equally in a 360-degree circle. Note that the presence of the parallel matching stub can cause a very slight &#8220;skew&#8221; or directional pull (usually 1 to 2 dB) away from a perfect circle, but for practical purposes, it performs identically in all directions.<\/li>\n\n\n\n<li><strong>Elevation Plane (Vertical):<\/strong> Looking at the antenna from the side, the J-Pole has a <strong>low angle of radiation<\/strong>. Instead of wasting energy shooting straight up into the sky, it compresses the RF energy down toward the horizon, resembling a squashed donut. This low takeoff angle maximizes your signal&#8217;s reach across the ground to distant repeaters or other stations.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Summary of Key Dimensions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To visualize the physical structure for a specific frequency, the J-Pole is roughly 3\/4 of a wavelength tall in total:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Total Height:<\/strong> ~ \u03bb\/2 (radiator) + \u03bb\/4 (matching section)<\/li>\n\n\n\n<li><strong>Stub Length:<\/strong> ~ \u03bb\/4<\/li>\n\n\n\n<li><strong>Gap\/Spacing:<\/strong> The parallel elements are typically spaced about 2% to 3% of a wavelength apart.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The J-Pole antenna is a popular, practical, and highly efficient omnidirectional antenna. At its core, it is an end-fed half-wave dipole that uses a clever impedance-matching trick to connect to standard coaxial cable. Here is a breakdown of how it works and how it radiates your signal. 1. The Working Principle: Impedance Matching The fundamental [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17272,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-17271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Working Principle and Radiation Pattern of a J-Pole Antenna - Johnson&#039;s Techworld<\/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:\/\/johnsonfrancis.org\/techworld\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Working Principle and Radiation Pattern of a J-Pole Antenna - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The J-Pole antenna is a popular, practical, and highly efficient omnidirectional antenna. 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The Working Principle: Impedance Matching The fundamental [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-03T12:43:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-03T12:43:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2026\/06\/Working-Principle-and-Radiation-Pattern-of-a-J-Pole-Antenna.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"676\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"Working Principle and Radiation Pattern of a J-Pole Antenna\",\"datePublished\":\"2026-06-03T12:43:26+00:00\",\"dateModified\":\"2026-06-03T12:43:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\\\/\"},\"wordCount\":499,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Working-Principle-and-Radiation-Pattern-of-a-J-Pole-Antenna.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/working-principle-and-radiation-pattern-of-a-j-pole-antenna\\\/\",\"name\":\"Working Principle and Radiation Pattern of a J-Pole Antenna - 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