UHF截断单极子天线及其匹配网络设计 - 应用科学学报.PDFVIP

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UHF截断单极子天线及其匹配网络设计 - 应用科学学报.PDF

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UHF截断单极子天线及其匹配网络设计 - 应用科学学报

29 4 Vol. 29 No. 4 20117 JOURNAL OF APPLIED SCIENCES — Electronics and Information Engineering Jul. 2011 DOI: 10.3969/j.issn.0255-8297.2011.04.015 UHF 610054 UHF. LC100400 MHz. CST2009 . . 100350 MHz 0 dBi350400 MHz 0 dBi. 100400 MHz10 dB 60%. TN821 .3 0255-8297(2011)04-0423-05 Design of UHF Truncated Monopole Antenna and Its Matching Network ZHANG Jun-rui, XIAO Shao-qiu, DING Xiao, TANG Ming-chun, BAI Yan-ying School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China Abstract: A broadband monopole antenna working in UHF band is designed. A monopole antenna is cut into two parts. They are connected in series. This step improves the horizontal gain in the upper part of the operating band. A lossless LC ladder is then used to match the antenna impedance from 100 MHz to 400 MHz. The truncating position and circuit element parameters in the matching network are obtained using CST2009 optimization. Reﬂection coeﬃcients of the truncated antennas both with and without the matching network are measured, showing good agreement with the simulation results. The following conclusions are drawn. The gain in the horizontal direction of the antenna with matching network is more than 0 dBi between 100 MHz and 350 MHz, and stays within 0 dBi from 350 MHz to 400 MHz. The simulated reﬂection coeﬃcient of the antenna is below 10 dB within 100 MHz and 400 MHz. The eﬃciency is over 60% within the operating band. Keywords: truncation, broa