Pub Date : 2013-03-04DOI: 10.1109/IWAT.2013.6518288
G. Yassin, J. Leech, B. Tan, P. Kittara
Modern ground-based radio-telescopes have stringent requirements on the receiver's feed-horn performance. These include a bandwidth covering a full atmospheric window from good sites (~ 30%), low cross polarization and high beam circularity. In addition the unprecedented sensitivity required by recent proposed experiments requires large format focal plane arrays consisting of a large number of high performance feeds. While these feeds are straightforward to fabricate at microwave frequencies, the tight tolerances required in the THz region makes the realization of a large format array both expensive and time consuming. In this paper we describe feed designs that can be fabricated cheaply and rapidly without compromising the science requirements within the operating bandwidth. We present simulated and measured far-field beam patterns showing low sidelobe levels, good beam circularity and low cross-polarization levels over a fractional bandwidth of 20%. Having demonstrated the efficacy of our horn designs and fabricating technique experimentally, we have designed, fabricated and tested a prototype focal plane array of 37 hexagonally close packed horns milled in a single block of aluminum. Experimental testing of the radiation patterns of the array feeds demonstrated that they were essentially identical to the patterns of the feeds fabricated individually and that cross coupling between adjacent feeds was negligible.
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Pub Date : 2013-03-01DOI: 10.1109/IWAT.2013.6518306
Muhammad Umar Khan, M. Sharawi
A compact 8-element MIMO antenna system which conforms to the new 802.11ac standards is designed for WLAN applications. The antenna operates in the 5 GHz band. The elements of the MIMO antenna system are patch antennas loaded with the CSRR for antenna miniaturization. The overall size of the MIMO antenna system is 100 × 50 × 0.8 mm3. The measurement results of the fabricated antenna are found to be in agreement with the simulation results of the design. The measurements show that the proposed MIMO antenna has a minimum bandwidth of 80 MHz and a minimum isolation of 10.95 dB between its antenna elements. The maximum gain for a single operating element of the proposed antenna is -0.16 dBi.
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Pub Date : 2013-03-01DOI: 10.1109/IWAT.2013.6518371
M. Martínez-Vázquez
Communication and sensing in varying wireless environments require resilient, adaptive antenna systems for reliable data transmission and seamless access to various infrastructures. The emergence of new technologies and the need for more efficient use of resources shifts antenna system design towards cross-disciplinary approaches. The COST Action IC1102 “VISTA” aims at identifying key research topics, and facilitating the networking and coordination between different R&D teams.
{"title":"COST IC1102 VISTA: Strengthening pan-European cooperation in antenna research","authors":"M. Martínez-Vázquez","doi":"10.1109/IWAT.2013.6518371","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518371","url":null,"abstract":"Communication and sensing in varying wireless environments require resilient, adaptive antenna systems for reliable data transmission and seamless access to various infrastructures. The emergence of new technologies and the need for more efficient use of resources shifts antenna system design towards cross-disciplinary approaches. The COST Action IC1102 “VISTA” aims at identifying key research topics, and facilitating the networking and coordination between different R&D teams.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133302857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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