{"id":43171,"date":"2020-11-18T11:06:22","date_gmt":"2020-11-18T09:06:22","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=43171"},"modified":"2020-11-24T17:21:45","modified_gmt":"2020-11-24T15:21:45","slug":"brevet","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/brevet.html","title":{"rendered":"Dispositif \u00e0 ondes acoustiques de surface ajustable en fr\u00e9quence"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13nfo5f-1769d5536c6735472374724890eab630\">\n.flex_column.av-13nfo5f-1769d5536c6735472374724890eab630{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-13nfo5f-1769d5536c6735472374724890eab630 av_one_full  avia-builder-el-0  el_before_av_one_fifth  avia-builder-el-first  first flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-m5ahhf-f940023686974a8b41c96cea72b0edb9'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h3 style=\"text-align: center;\">Dispositif \u00e0 ondes acoustiques de surface ajustable en fr\u00e9quence<\/h3>\n<hr \/>\n<p style=\"text-align: left;\">Dans le cadre des t\u00e9l\u00e9communications, un grand nombre de bandes de Radio-Fr\u00e9quences (RF) sont utilis\u00e9es afin de transmettre ou de recevoir l&rsquo;information. Chaque bande d\u00e9finit un canal pour lequel des fonctions de filtrages sont n\u00e9cessaires afin de restituer l&rsquo;information.<br \/>\nLes filtres de fr\u00e9quence passifs \u00e0 ondes acoustiques de surface (SAW) occupent une place cruciale dans les syst\u00e8mes de t\u00e9l\u00e9communication radiofr\u00e9quence. Toutefois, ces dispositifs ne permettent pas un ajustement command\u00e9 en tension de leur fr\u00e9quence de travail ni de leur bande passante.<\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1imnyqr-1eb622bf1fea0728fec46450a766a89a\">\n.flex_column.av-1imnyqr-1eb622bf1fea0728fec46450a766a89a{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-1imnyqr-1eb622bf1fea0728fec46450a766a89a av_one_fifth  avia-builder-el-2  el_after_av_one_full  el_before_av_four_fifth  first flex_column_div av-zero-column-padding  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-khn7bjdr-e1df4b4684ee3d1cf031f7b6889185a2\">\n.av_font_icon.av-khn7bjdr-e1df4b4684ee3d1cf031f7b6889185a2{\ncolor:#b02b2c;\nborder-color:#b02b2c;\n}\n.av_font_icon.av-khn7bjdr-e1df4b4684ee3d1cf031f7b6889185a2 .av-icon-char{\nfont-size:40px;\nline-height:40px;\n}\n<\/style>\n<span  class='av_font_icon av-khn7bjdr-e1df4b4684ee3d1cf031f7b6889185a2 avia_animate_when_visible av-icon-style- avia-icon-pos-right avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue889' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-148oug3-5a2dfca6c008779b902cc9fef45d3ce7\">\n.flex_column.av-148oug3-5a2dfca6c008779b902cc9fef45d3ce7{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-148oug3-5a2dfca6c008779b902cc9fef45d3ce7 av_four_fifth  avia-builder-el-4  el_after_av_one_fifth  el_before_av_one_fifth  flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-khn7c1p5-95158721bff39bed81a4ba5a4504bc78'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><blockquote>\n<p><strong>La solution propos\u00e9e consiste \u00e0 modifier les conditions \u00e9lectriques au sein des dispositifs SAW afin de faire varier leur fr\u00e9quence de fonctionnement, c&rsquo;est-\u00e0-dire rendre les filtres SAW agiles en fr\u00e9quence tout en pr\u00e9servant l&rsquo;int\u00e9grit\u00e9 de la fonction de filtrage. La modification et le contr\u00f4le des fr\u00e9quences de fonctionnement des dispositifs sont r\u00e9alis\u00e9s par une commande \u00e9lectrique ext\u00e9rieure.<\/strong><br \/>\n<strong> L&rsquo;agilit\u00e9 en fr\u00e9quence permet de ne consid\u00e9rer qu\u2019un seul dispositif pour investiguer plusieurs bandes de fr\u00e9quences pour une m\u00eame fonctionnalit\u00e9 de filtrage.<\/strong><\/p>\n<\/blockquote>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-v4gkn7-0ff107f3a694f99cf3a0f7d928fc5e6b\">\n.flex_column.av-v4gkn7-0ff107f3a694f99cf3a0f7d928fc5e6b{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-v4gkn7-0ff107f3a694f99cf3a0f7d928fc5e6b av_one_fifth  avia-builder-el-6  el_after_av_four_fifth  el_before_av_one_third  first flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-khn7khn0-f35c177c9a3c6410f008800d5f0ef78a'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"color: #ffffff;\">&#8211;<\/span><\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-4rhrj7-358fce8bae435b5ebb1064a0ac33e792\">\n.flex_column.av-4rhrj7-358fce8bae435b5ebb1064a0ac33e792{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-4rhrj7-358fce8bae435b5ebb1064a0ac33e792 av_one_third  avia-builder-el-8  el_after_av_one_fifth  el_before_av_one_third  flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-khn6v3qm-6f0c5ee1f3eb1b480303b70b88fa31f5'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-43178 aligncenter\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_2.jpg\" alt=\"\" width=\"200\" height=\"102\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_2.jpg 200w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_2-16x8.jpg 16w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a>Sch\u00e9ma de principe : r\u00e9sonateur (en rouge le transducteur, en bleu les miroirs). Les \u00e9lectrodes des miroirs sont classiquement reli\u00e9es \u00e0 la masse. Ici, on propose une connexion des \u00e9lectrodes des miroirs ou \u00e0 la masse ou en circuit ouvert<\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-pb4kcj-a4d7035f9487f734aa985a73aac79f1c\">\n.flex_column.av-pb4kcj-a4d7035f9487f734aa985a73aac79f1c{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-pb4kcj-a4d7035f9487f734aa985a73aac79f1c av_one_third  avia-builder-el-10  el_after_av_one_third  el_before_av_one_fifth  flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-khn6vh9d-a477edd0dd86e7d0240e7a3dd0bb3216'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"text-align: center;\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-43179\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_1-211x300.jpg\" alt=\"\" width=\"211\" height=\"300\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_1-211x300.jpg 211w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_1-8x12.jpg 8w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2020\/11\/croquis_brevet_1.jpg 450w\" sizes=\"auto, (max-width: 211px) 100vw, 211px\" \/><\/a>R\u00e9sultat sur un r\u00e9sonateur avec changement des connexions : tout CC (tout court circuit = tout \u00e0 la masse), puis 10 \u00e9lectrodes en CO (circuit ouvert), puis 30 en CO puis 50 en CO puis tout en CO : on voit le d\u00e9calage de la fr\u00e9quence de fonctionnement du r\u00e9sonateur.<\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1gf4gbn-9a282c3490261e4db6fda65b8f5203cf\">\n.flex_column.av-1gf4gbn-9a282c3490261e4db6fda65b8f5203cf{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-1gf4gbn-9a282c3490261e4db6fda65b8f5203cf av_one_fifth  avia-builder-el-12  el_after_av_one_third  el_before_av_one_third  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-khn7xehw-5329af102e128fc1dceaa3d6bbfb18e5'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"color: #ffffff;\">&#8211;<\/span><\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-14j3xj7-5a6b8fcbe3047b8cf229a9ad79ffc9e8\">\n.flex_column.av-14j3xj7-5a6b8fcbe3047b8cf229a9ad79ffc9e8{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-14j3xj7-5a6b8fcbe3047b8cf229a9ad79ffc9e8 av_one_third  avia-builder-el-14  el_after_av_one_fifth  el_before_av_one_third  flex_column_div av-zero-column-padding  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-khn8063n-fd95c738ff5dea948f14bd70cf23252f\">\n.av_font_icon.av-khn8063n-fd95c738ff5dea948f14bd70cf23252f{\ncolor:#b02b2c;\nborder-color:#b02b2c;\n}\n.av_font_icon.av-khn8063n-fd95c738ff5dea948f14bd70cf23252f .av-icon-char{\nfont-size:40px;\nline-height:40px;\n}\n<\/style>\n<span  class='av_font_icon av-khn8063n-fd95c738ff5dea948f14bd70cf23252f avia_animate_when_visible av-icon-style- avia-icon-pos-right avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue826' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m296ar-95a0776a49af4a8db69322f720cd4594\">\n.flex_column.av-m296ar-95a0776a49af4a8db69322f720cd4594{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-m296ar-95a0776a49af4a8db69322f720cd4594 av_one_third  avia-builder-el-16  el_after_av_one_third  avia-builder-el-last  flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-khn81f39-2eee0148c8d0538d71b1110073e27b1b'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h5><strong><span style=\"color: #800000;\"><span style=\"color: #ffffff;\">______________________________________________________________________________________<\/span><br \/>\n<\/span><a href=\"https:\/\/worldwide.espacenet.com\/publicationDetails\/biblio?FT=D&amp;date=20200702&amp;DB=EPODOC&amp;locale=fr_EP&amp;CC=WO&amp;NR=2020136262A1&amp;KC=A1&amp;ND=5\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #800000;\">En savoir +<\/span><\/a><\/strong><\/h5>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-43171","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/43171","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=43171"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/43171\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=43171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=43171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=43171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}