{"id":313,"date":"2021-09-10T15:00:44","date_gmt":"2021-09-10T13:00:44","guid":{"rendered":"http:\/\/blog.tomasbrincil.cz\/?p=313"},"modified":"2021-09-10T15:08:21","modified_gmt":"2021-09-10T13:08:21","slug":"meander-dipole-antenna","status":"publish","type":"post","link":"https:\/\/blog.tomasbrincil.cz\/?p=313","title":{"rendered":"Meander dipole antenna"},"content":{"rendered":"\n<p>It took some time from my first design on meander dipole antenna, but last weeks I made further progress. Meander dipole is electricaly same length as dipole antenna but meanders make it physically shorter and they are able shift impedance to the sweetpot of Smith\u00b4s diagram.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"454\" src=\"http:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32-1024x454.png\" alt=\"\" data-id=\"314\" data-full-url=\"http:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32.png\" data-link=\"http:\/\/blog.tomasbrincil.cz\/?attachment_id=314\" class=\"wp-image-314\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32-1024x454.png 1024w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32-300x133.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32-768x341.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32-1200x532.png 1200w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.32.png 1294w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\">Fig. 1 &#8211; Antenna overview.<\/figcaption><\/figure>\n\n\n\n<p>Big advantages of meander dipole antenna is near-perfect impedance match to power line and smaller size than physical. But of course there is disadvantage in lower radiation efficiency.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.qsl.net\/kk4obi\/Meander%20Pix\/Meanders%20vs%20Relative%20Length%20graph.png\" alt=\"Meanders vs Relative Length\"\/><figcaption>Fig. 2 &#8211; Number of meanders vs. length reduction.<\/figcaption><\/figure>\n\n\n\n<p>It looses about 8-12 % of efficiency which can be 0.7 &#8211; 1.2 dB which looks horribly but it certainly nulls the loss on full dipole because of impedance mismatch 73 + 43j Ohms to 50 + 0j Ohms.<\/p>\n\n\n\n<p>Further development was made on implementation of SMD baluns. Previous experiments with various types of ferrite rings were not successful. I discovered cheap wideband SMD made by MACOM [4] which is rated to 250 mW only. But if you dont mind over saturation of core it can work up to 4 W without heating HI.<\/p>\n\n\n\n<p>Model was made in AntennaDesigner toolbox from MATLAB. You can see that simulation of Impedance in Fig. 3 is nearly perfect antenna.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"761\" src=\"http:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1-1024x761.png\" alt=\"\" data-id=\"321\" data-full-url=\"http:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1.png\" data-link=\"http:\/\/blog.tomasbrincil.cz\/?attachment_id=321\" class=\"wp-image-321\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1-1024x761.png 1024w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1-300x223.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1-768x571.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1-1200x891.png 1200w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.56.53-1.png 1268w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\">Fig. 3 &#8211; Impedance of meander dipole antenna.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.57.04-2-1024x741.png\" alt=\"\" class=\"wp-image-328\" width=\"627\" height=\"453\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.57.04-2-1024x741.png 1024w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.57.04-2-300x217.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.57.04-2-768x556.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.57.04-2-1200x868.png 1200w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2020\/11\/Snimek-obrazovky-2020-11-03-v-11.57.04-2.png 1294w\" sizes=\"auto, (max-width: 627px) 100vw, 627px\" \/><figcaption>Fig. 4 &#8211; S11 parameter.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-2-1024x576.png\" alt=\"\" class=\"wp-image-458\" width=\"626\" height=\"352\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-2-1024x576.png 1024w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-2-300x169.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-2-768x432.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-2-1200x675.png 1200w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-2.png 1280w\" sizes=\"auto, (max-width: 626px) 100vw, 626px\" \/><figcaption>Fig. 5 &#8211; Radiation pattern.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1024x333.png\" alt=\"\" class=\"wp-image-456\" width=\"630\" height=\"204\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1024x333.png 1024w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-300x98.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-768x250.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image.png 1189w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><figcaption>Fig. 6 &#8211; PCB visualisation<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"767\" height=\"1024\" src=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/07\/image_2021-04-22_10-30-16-767x1024.png\" alt=\"\" class=\"wp-image-362\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/07\/image_2021-04-22_10-30-16-767x1024.png 767w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/07\/image_2021-04-22_10-30-16-225x300.png 225w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/07\/image_2021-04-22_10-30-16-768x1025.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/07\/image_2021-04-22_10-30-16.png 956w\" sizes=\"auto, (max-width: 767px) 100vw, 767px\" \/><figcaption>Fig. 7 &#8211;  Measuring S parameters on NanoVNA.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1-1024x576.png\" alt=\"\" class=\"wp-image-457\" width=\"627\" height=\"352\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1-1024x576.png 1024w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1-300x169.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1-768x432.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1-1200x675.png 1200w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-1.png 1280w\" sizes=\"auto, (max-width: 627px) 100vw, 627px\" \/><figcaption>Fig. 8 &#8211; Balun placed on meander dipole PCB antenna<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-3-1022x1024.png\" alt=\"\" class=\"wp-image-459\" width=\"628\" height=\"629\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-3-1022x1024.png 1022w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-3-300x300.png 300w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-3-150x150.png 150w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-3-768x769.png 768w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-3.png 1066w\" sizes=\"auto, (max-width: 628px) 100vw, 628px\" \/><figcaption>Fig. 9 &#8211; Trying to make rubber duck \/ donkey dick anntenna with meander dipole inside.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"799\" height=\"958\" src=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-4.png\" alt=\"\" class=\"wp-image-460\" srcset=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-4.png 799w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-4-250x300.png 250w, https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/image-4-768x921.png 768w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><figcaption>Fig. 10 &#8211; Final result looks better than it worked.<\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\"><li>https:\/\/www.mathworks.com\/help\/antenna\/ref\/dipolemeander.html<\/li><li>https:\/\/www.qsl.net\/kk4obi\/Meander%20Dipole.html<\/li><li>https:\/\/apps.dtic.mil\/sti\/pdfs\/ADA617035.pdf<\/li><li>MACOM \/ MABA-001759-000000<\/li><\/ol>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/MABA_007159_000000-318068.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of Embed of MABA_007159_000000-318068..\"><\/object><a href=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/MABA_007159_000000-318068.pdf\">MABA_007159_000000-318068<\/a><a href=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/MABA_007159_000000-318068.pdf\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n\n\n\n<div class=\"wp-block-file\"><a href=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/meander_dipol_280M.kicad_pcb.txt\">meander_dipol_280M.kicad_pcb<\/a><a href=\"https:\/\/blog.tomasbrincil.cz\/wp-content\/uploads\/2021\/09\/meander_dipol_280M.kicad_pcb.txt\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>It took some time from my first design on meander dipole antenna, but last weeks I made further progress. Meander dipole is electricaly same length as dipole antenna but meanders make it physically shorter and they are able shift impedance to the sweetpot of Smith\u00b4s diagram. Big advantages of meander dipole antenna is near-perfect impedance &hellip; <a href=\"https:\/\/blog.tomasbrincil.cz\/?p=313\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Meander dipole antenna<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16,13,6,17],"class_list":["post-313","post","type-post","status-publish","format-standard","hentry","category-blog","tag-antenna","tag-diy","tag-ham","tag-satcom"],"_links":{"self":[{"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=\/wp\/v2\/posts\/313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=313"}],"version-history":[{"count":7,"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=\/wp\/v2\/posts\/313\/revisions"}],"predecessor-version":[{"id":546,"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=\/wp\/v2\/posts\/313\/revisions\/546"}],"wp:attachment":[{"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.tomasbrincil.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}