{"id":54508,"date":"2022-09-02T10:31:41","date_gmt":"2022-09-02T08:31:41","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=54508"},"modified":"2022-09-20T08:05:15","modified_gmt":"2022-09-20T06:05:15","slug":"switchability-of-a-single-port-saw-resonator-using-the-electric-bragg-bandgap","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/switchability-of-a-single-port-saw-resonator-using-the-electric-bragg-bandgap.html","title":{"rendered":"Switchability of a single-port SAW resonator using the electric Bragg bandgap"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-p2i0to-01a86a881e93787dec5ce361f013bdef\">\n.flex_column.av-p2i0to-01a86a881e93787dec5ce361f013bdef{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-p2i0to-01a86a881e93787dec5ce361f013bdef av_one_full  avia-builder-el-0  avia-builder-el-no-sibling  first flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-l7k74vey-cb0943489c7ac4a3296e5f81c6beff04'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h4>Switchability of a single-port SAW resonator using the electric Bragg bandgap<\/h4>\n<p>Surface acoustic wave filters play a crucial role in radio frequency communication systems. A joint work between Thales Research Technology and IEMN demonstrates that it is possible to tune these filters electrically by exploiting the electrical bandgap concept.<\/p>\n<p>Surface acoustic wave filters play a crucial role in radio frequency communication systems. However, these devices do not currently allow voltage-controlled adjustment of their working frequency or bandwidth. Whatever the application, the ability to tune these filters in an efficient and deterministic way is a significant issue for the improvement of embedded RF signal processing modules.<\/p>\n<p>To this end, the research activities presented in this APL paper aim at exploring the concept of electrical bandgap for surface acoustic wave filtering devices (see Patent). In particular, one of the classical components for RF communications is the single port resonator, a piezoelectric block with a central transducer (interdigitated combs) on its surface and mirrors on both sides (figure 1). \u00a0The assembly of several resonators forms bandpass filters, classical components present in cell phones.<\/p>\n<div id=\"attachment_54472\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-54472\" class=\"wp-image-54472 size-full\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH1.jpg\" alt=\"\" width=\"500\" height=\"306\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH1.jpg 500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH1-300x184.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH1-18x12.jpg 18w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><p id=\"caption-attachment-54472\" class=\"wp-caption-text\">Figure 1: Surface wave resonator, consisting of a central transducer (red) between two electrode-based mirrors, on a piezoelectric substrate. The electrodes of the mirrors are conventionally connected to ground and are here progressively open-circuited (from the electrodes closest to the central transducer in red to the outside)<\/p><\/div>\n<p>In this APL paper, it was shown that changing the electrical connection of the mirror electrodes from \u00ab\u00a0grounded\u00a0\u00bb to \u00ab\u00a0open circuit\u00a0\u00bb from the electrodes closest to the central transducer to the electrodes furthest from it, allows the control of wave propagation by changing the frequency of the band gap of the mirrors, the band of frequencies in which the waves are reflected, depending on the electrical connection. Based on this observation, a resonator was designed with several operating points, at different frequencies (Figure 2)<\/p>\n<div id=\"attachment_54483\" style=\"width: 460px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH.jpeg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-54483\" class=\"wp-image-54483 size-full\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH.jpeg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH.jpeg 450w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH-300x300.jpeg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH-80x80.jpeg 80w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH-12x12.jpeg 12w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH-36x36.jpeg 36w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH-180x180.jpeg 180w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><p id=\"caption-attachment-54483\" class=\"wp-caption-text\">Figure 2: Parameter S11 of the LiNbO3 resonator (transducer + two mirrors with 72 electrodes on each side) if the mirror electrodes are progressively set from the \u00ab\u00a0grounded\u00a0\u00bb condition to the \u00ab\u00a0floating potential\u00a0\u00bb condition. Resonances are marked by the bright color. They vary according to the number of electrodes in floating potential (NOC, the electrodes of the two mirrors are put in floating potential symmetrically).<\/p><\/div>\n<p>In collaboration with project partner Thales Research Technology, device fabrication, characterization and testing have effectively shown a device agility of about 3% (Figure 3). This first result serves as a building block for the assembly of future agile components. Further studies will focus on the simplification of the electrical connection between the different states (grounding \/ open circuit) to consider the integration of these agile resonators in real devices.<\/p>\n<div id=\"attachment_54479\" style=\"width: 560px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH4-1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-54479\" class=\"wp-image-54479 size-full\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH4-1.jpg\" alt=\"\" width=\"550\" height=\"333\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH4-1.jpg 550w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH4-1-300x182.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/AH4-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/a><p id=\"caption-attachment-54479\" class=\"wp-caption-text\">Figure 3: S11 parameter of the LiNbO3 resonator (transducer + two mirrors with 72 electrodes on each side) if the mirror electrodes are partially put in floating potential condition (0 \/ 10 \/ 30 \/ 50 and 72). Left: images of the fabricated resonators, right: measured (blue) and simulated (green) responses.<\/p><\/div>\n<p>The research was carried out in the framework of the ANR Astrid Maturation FORMOSA (MicrO-fabricated Radiofrequency phOnonic Filters) 2019-2022.<\/p>\n<p>Patent : \u00a0\u00bb SURFACE ACOUSTICAL WAVE DEVICE \u00ab\u00a0, 02\/07\/2020 (IEMN, Thales RT and Frec&rsquo;N&rsquo;Sys)<\/p>\n<p>Papier\u00a0:<br \/>\n<a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2022\/09\/SAWCommutableResonator_V15_reprint.pdf\" target=\"_blank\" rel=\"noopener\">Switchability of a single port SAW resonator using the electrical Bragg band gap<\/a><br \/>\nAppl. Phys. Lett. 120, 203504 (2022); https:\/\/doi.org\/10.1063\/5.0093357<\/p>\n<div  class='avia-button-wrap av-rpqvoq-e9b3566697fdf6138ce505cd6a9eafd7-wrap avia-button-left  avia-builder-el-2  avia-builder-el-no-sibling'><a href='mailto:anne-christine.hladky@isen.fr'  class='avia-button av-rpqvoq-e9b3566697fdf6138ce505cd6a9eafd7 av-link-btn avia-icon_select-yes-left-icon avia-size-small avia-position-left avia-color-silver'   aria-label=\"anne-christine.hladky@isen.fr\"><span class='avia_button_icon avia_button_icon_left' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >anne-christine.hladky@isen.fr<\/span><\/a><\/div>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-54508","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/54508","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\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=54508"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/54508\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=54508"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=54508"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=54508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}