{"628371":{"#nid":"628371","#data":{"type":"event","title":"Ph.D. Dissertation Defense - Mohammad Alhassoun","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle\u003C\/strong\u003E\u003Cem\u003E:\u0026nbsp; \u003C\/em\u003E\u003Cem\u003ETheory and Design of Next-generation Retrodirective Tags and Their Channels\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Gregory Durgin, ECE, Chair , Advisor\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Andrew Peterson, ECE\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. John Barry, ECE\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Paul Steffes, ECE\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Michael Buehrer, Virginia Polytechnic Institute\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract: \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EPassive and semi-passive backscatter communication systems such as radio-frequency identification (RFID) experience several challenges that limit their proliferation especially at microwave and millimeter-wave (mm-wave) frequencies, a consequence from the round-trip and low-powered nature of these systems. These challenges manifest themselves in the forms of backscatter-communication range reduction, deep spatial nulls caused by the rapid change in the received power within a small area, or both. To overcome these challenges, a retrodirective-array-equipped backscatter transponder (an RFID tag) is used to replace the standard single-antenna transponder. The benefits of using retrodirective tags are twofold: First, since retrodirective tags that operate at microwave and mm-wave frequencies have similar propagation properties\u0026mdash;in terms of power losses and field-of-view\u0026mdash;to the current single-antenna RFID tags, which operate at ultra-high frequency (UHF) band, the higher-frequency retrodirective tags maintain the same coverage distance as the UHF tags and permit faster data rates by leveraging the spectrum availability at microwave and mm-wave regimes. Second, retrodirective tags reduce the randomness of the backscatter RFID channel by changing the small-scale statistical behavior of the channel from\u0026nbsp; double- to single-fading statistics, much like current one-way wireless channels\u0026mdash;an\u0026nbsp; original contribution of this research.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Theory and Design of Next-generation Retrodirective Tags and Their Channels "}],"uid":"28475","created_gmt":"2019-10-30 20:25:13","changed_gmt":"2019-10-30 20:25:13","author":"Daniela Staiculescu","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2019-11-06T14:00:00-05:00","event_time_end":"2019-11-06T16:00:00-05:00","event_time_end_last":"2019-11-06T16:00:00-05:00","gmt_time_start":"2019-11-06 19:00:00","gmt_time_end":"2019-11-06 21:00:00","gmt_time_end_last":"2019-11-06 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"434381","name":"ECE Ph.D. Dissertation Defenses"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"},{"id":"1808","name":"graduate students"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}