應用於Wi-Fi分享器之雙極天線陣列設計;Design of Printed Dipole Antenna Array for Wi-Fi Access Point Application

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Title:	應用於Wi-Fi分享器之雙極天線陣列設計;Design of Printed Dipole Antenna Array for Wi-Fi Access Point Application
Authors:	王志祥;Wang, Chih-Hsiang
Contributors:	電機工程學系
Keywords:	天線陣列;雙極天線;全向性輻射;antenna array;dipole antenna;Omnidirectional radiation
Date:	2018-07-23
Issue Date:	2018-08-31 14:51:44 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文針對串並聯線性天線陣列與主波瓣偏轉改善做設計與探討。在天線陣列部分，我們採用平面式雙極天線，各單元之間使用PPL (Parallel plate line)串聯，將兩路串聯天線陣列使用100 Ω之PPL與四分之一阻抗轉換器來進行並聯饋入，並在100 Ω之PPL中鑽孔使用50 Ω同軸電纜做為整體天線饋入。此串並聯饋入方法可以有效抑制主波瓣偏轉現象，使頻段內之偏轉角度維持在正負5度內。本天線陣列分別設計於FR4與Kappa 438基板上，主要觀察板材的介質損耗對於天線增益的影響程度，並討論串聯能量均分的成效。天線頻寬以-10 dB以下的反射係數定義下，在5.15 GHz至5.85 GHz皆可涵蓋，可滿足5 GHz頻段之Wi-Fi應用與WHDI應用要求。在Kappa 438製作之十二個天線單元之天線陣列中，可達到頻帶內的峰值增益差異在1 dB內，量測平均峰值增益為7.26 dBi，最大峰值增益達7.70 dBi。本論文使用全波模擬軟體為HFSS，電路模擬軟體為ADS。 ;Designs of series-parallel linear antenna array with parallel plate line (PPL) are discussed in the thesis. In the section regarding the antenna array, two series antenna arrays are fed in parallel by using a 100-Ω PPL and a quarter-wavelength impedance transformer. In addition, a 50 Ω coaxial cable is used as the overall antenna feed. The serial-parallel feeding method can suppress the frequency scanning and maintain the deflection angle in frequency band within 5 degrees. The antenna array is respectively designed on the FR4 and Kappa 438 substrates. The influence of the dielectric loss on the antenna gain and the effect of series energy sharing among elements are observed and discussed. The specified frequency band is from 5.15 GHz to 5.85 GHz, which is for the Wi-Fi and WHDI applications. In the antenna array of twelve elements produced on the Kappa 438 substrate, the gain deviation within 1 dB in the band has been achieved, with a measured average peak gain of 7.26 dBi and a maximum peak gain of 7.70 dBi. The full-wave simulation software used in the thesis is HFSS, and the circuit simulation software is ADS.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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