{"id":2343,"date":"2021-02-18T21:40:59","date_gmt":"2021-02-18T21:40:59","guid":{"rendered":"http:\/\/dh5ym.hopto.org\/wiki\/?p=2343"},"modified":"2021-02-18T21:47:40","modified_gmt":"2021-02-18T21:47:40","slug":"some-more-about-saw-filtered-lna","status":"publish","type":"post","link":"http:\/\/dh5ym.hopto.org\/wiki\/?p=2343","title":{"rendered":"Some more about SAW filtered LNA"},"content":{"rendered":"<p>The 1090MHz filters arrived and i measured this variant plus one without filter.<\/p>\n<p>Closer to the filter the response looks quite ok:<br \/>\n<div id=\"attachment_2344\" style=\"width: 638px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_1090M.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2344\" src=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_1090M.jpg\" alt=\"\" width=\"628\" height=\"449\" class=\"size-full wp-image-2344\" \/><\/a><p id=\"caption-attachment-2344\" class=\"wp-caption-text\">LNA 1090MHz<\/p><\/div><\/p>\n<p>Far away from the passband the supression degrades. Especially very high frequencies pass the filter quite well.<br \/>\n<div id=\"attachment_2345\" style=\"width: 647px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_1090M_span3G.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2345\" src=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_1090M_span3G.png\" alt=\"\" width=\"637\" height=\"451\" class=\"size-full wp-image-2345\" \/><\/a><p id=\"caption-attachment-2345\" class=\"wp-caption-text\">LNA 1090M span 3GHz<\/p><\/div><\/p>\n<p>This is the assembly with 47pF capacitors and a 27nH coil for supply of the MMIC. Below 200MHz does not pass the capacitors well. There is even some remaining gain at 3.4GHz although its a 1.6mm thick FR4 PCB.<br \/>\n<div id=\"attachment_2347\" style=\"width: 639px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_no_filter_full.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2347\" src=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2021\/02\/LNA_no_filter_full.png\" alt=\"\" width=\"629\" height=\"450\" class=\"size-full wp-image-2347\" \/><\/a><p id=\"caption-attachment-2347\" class=\"wp-caption-text\">LNA without filter<\/p><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The 1090MHz filters arrived and i measured this variant plus one without filter. Closer to the filter the response looks quite ok: Far away from the passband the supression degrades. Especially very high frequencies pass the filter quite well. This &hellip; <a href=\"http:\/\/dh5ym.hopto.org\/wiki\/?p=2343\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,27],"tags":[],"class_list":["post-2343","post","type-post","status-publish","format-standard","hentry","category-electronics","category-microwave"],"_links":{"self":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/2343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2343"}],"version-history":[{"count":3,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/2343\/revisions"}],"predecessor-version":[{"id":2350,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/2343\/revisions\/2350"}],"wp:attachment":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2343"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}