{"id":467408,"date":"2022-06-24T20:49:48","date_gmt":"2022-06-24T17:49:48","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/efficient-satellite-downlink-with-a-ka-band-dual-circular-polarization-transmitter\/"},"modified":"2022-06-24T20:49:48","modified_gmt":"2022-06-24T17:49:48","slug":"efficient-satellite-downlink-with-a-ka-band-dual-circular-polarization-transmitter","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/efficient-satellite-downlink-with-a-ka-band-dual-circular-polarization-transmitter\/","title":{"rendered":"#Efficient satellite downlink with a Ka band dual circular polarization transmitter"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6af281094076b\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #dd3333;color:#dd3333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #dd3333;color:#dd3333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6af281094076b\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/buradabiliyorum.com\/en\/efficient-satellite-downlink-with-a-ka-band-dual-circular-polarization-transmitter\/#%E2%80%9CEfficient_satellite_downlink_with_a_Ka_band_dual_circular_polarization_transmitter%E2%80%9D\" >&#8220;Efficient satellite downlink with a Ka band dual circular polarization transmitter&#8221;<\/a><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"%E2%80%9CEfficient_satellite_downlink_with_a_Ka_band_dual_circular_polarization_transmitter%E2%80%9D\"><\/span>&#8220;Efficient satellite downlink with a Ka band dual circular polarization transmitter&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2022\/efficient-satellite-do.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2022\/efficient-satellite-do.jpg\" data-sub-html=\"Credit: Tokyo Tech\">\n<figure class=\"article-img\">\n            <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/scx1.b-cdn.net\/csz\/news\/800a\/2022\/efficient-satellite-do.jpg\" alt=\"Efficient satellite downlink with a Ka band dual circular polarization transmitter\" title=\"Credit: Tokyo Tech\" width=\"800\" height=\"530\"\/><figcaption class=\"text-darken text-low-up text-truncate-js text-truncate mt-3\">\n                Credit: Tokyo Tech<br \/>\n            <\/figcaption><\/figure>\n<\/p><\/div>\n<\/div>\n<p>Low earth orbit (LEO) satellites are being increasingly used for environmental monitoring of the earth, as well as for logistic purposes, such as the navigation of maritime vessels. The data transmitted from the satellite terminals to the receivers on Earth, known as &#8220;downlink,&#8221; is steadily increasing and, as a result, requires new frequency domains.<\/p>\n<p>                                                                                In this regard, the Ka band for satellite communication in the microwave frequency range between 17\u201331 GHz offers several advantages. The Ka band allows for smaller antennas than those for conventional downlink frequencies and a phased array-based transmission, which enables transmission link control independent of the satellite position. However, transmission devices in the Ka range have so far been largely inefficient owing to a degradation of the signal beam polarization with the transmitter changing direction. The degraded polarization <a href=\"https:\/\/buradabiliyorum.com\/en\/category\/download-scripts-themes-apps\/\" data-internallinksmanager029f6b8e52c=\"9\" title=\"Download Scripts &amp; Themes &amp; Apps\" target=\"_blank\" rel=\"noopener\">app<\/a>ears as noise in the receiver, reducing the signal-to-noise ratio.<\/p>\n<p>Against this backdrop, researchers from Tokyo Institute of <a href=\"https:\/\/buradabiliyorum.com\/en\/category\/technology\/\" data-internallinksmanager029f6b8e52c=\"4\" title=\"Technology\" target=\"_blank\" rel=\"noopener\">Technology<\/a> (Tokyo Tech), Japan have now proposed, in a new study, what is the first reported dual circular polarization transmitter for satellites in the Ka band based on a standard silicon CMOS process. Their work was presented in the <i>IEEE Radio Frequency Integrated Circuits Symposium<\/i> and published in the conference proceedings. <\/p>\n<p>&#8220;In our study, we were able to lower the losses and increase the transmission efficiency by using an adaptive impedance tuning circuitry, realized with a low-loss pi-type transformer-based load tuner. With this innovation, a satellite will be able to transmit to a receiver on earth for a wide range of angles,&#8221; explains Associate Professor Atsushi Shirane, one of the authors in the study.<\/p>\n<p>In addition to the adaptive impedance circuity, a circular polarization detection circuitry was also integrated to calibrate the circular polarization upon beam steering. &#8220;As the load is tuned and the transmitter forms a larger angle with the receiver, the circular polarization deteriorates. This has been a fundamental limitation of using dual circular polarization. But, with our internal calibration for deterioration, this traditional constraint is lifted. This could enable a practical device based on our technology,&#8221; says Dr. Shirane.<\/p>\n<p>Indeed, as the researchers demonstrated, their innovative transmitter design showed a high power efficiency as well as a high equivalent isotropically radiated power over a wide range of angles (from -60\u00b0 to +60\u00b0).<\/p>\n<p>These findings could pave the way for a significant leap in downlink technology. Further, with growing environmental concerns, low-orbit earth monitoring is likely to become more important. In this light, these results highlight the Ka frequency band as a strong candidate for satellites communication in the years to come.\n                                                                                                                        <\/p>\n<hr\/>\n<div class=\"article-main__explore my-4 d-print-none\">\n<p>                                            Electricity and data over-the-air: The simultaneous transmission of 5G and power\n                                        <\/p><\/div>\n<hr class=\"mb-4\"\/>\n<div class=\"article-main__more p-4\">\n                                                                                                <strong>More information:<\/strong><br \/>\n                                                A Ka-Band Dual Circularly Polarized CMOS Transmitter with Adaptive Scan Impedance Tuner and Active XPD Calibration Technique for Satellite Terminal, <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/rfic-ieee.org\/\"><i>IEEE Radio Frequency Integrated Circuits Symposium<\/i><\/a><\/p><\/div>\n<div class=\"d-inline-block text-medium my-4\">\n                                                Provided by<br \/>\n                                                                                                    Tokyo Institute of Technology<br \/>\n                                                                                                        <a rel=\"nofollow noopener\" target=\"_blank\" class=\"icon_open\" href=\"http:\/\/www.titech.ac.jp\/\"><br \/>\n                                                        <svg>\n                                                            <use href=\"https:\/\/techx.b-cdn.net\/tmpl\/v2\/img\/svg\/sprite.svg#icon_open\" x=\"0\" y=\"0\"\/>\n                                                        <\/svg><br \/>\n                                                    <\/a><\/p><\/div>\n<p>                                        <!-- print only --><\/p>\n<div class=\"d-none d-print-block\">\n<p>                                                 <strong>Citation<\/strong>:<br \/>\n                                                 Efficient satellite downlink with a Ka band dual circular polarization transmitter (2022, June 24)<br \/>\n                                                 retrieved 25 June 2022<br \/>\n                                                 from https:\/\/techxplore.com\/<a href=\"https:\/\/buradabiliyorum.com\/en\/category\/news\/\" data-internallinksmanager029f6b8e52c=\"2\" title=\"News\" target=\"_blank\" rel=\"noopener\">news<\/a>\/2022-06-efficient-satellite-downlink-ka-band.html<\/p>\n<p>                                            This document is subject to copyright. 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The data transmitted from the satellite terminals to the receivers on Earth, known&#8230;<\/p>\n","protected":false},"author":1,"featured_media":467409,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2022\/efficient-satellite-do.jpg","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[],"class_list":["post-467408","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sciencee"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/467408","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=467408"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/467408\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media\/467409"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=467408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=467408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=467408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}