Broadband Balance-to-Unbalance ( Balun ) Design
碩士 === 國立交通大學 === 電信工程系所 === 94 === This thesis presents three broadband balun designs which are fabricated on low dielectric substrates (eps=3.38 ) using conventional low cost PCB process. High even-mode impedances for coupled lines can be achieved by using Vertical Installed Planar ( VIP ) structu...
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ndltd-TW-094NCTU54350462016-05-27T04:18:34Z http://ndltd.ncl.edu.tw/handle/35571617266466281915 Broadband Balance-to-Unbalance ( Balun ) Design 寬頻巴倫設計 Jhe-Ching Lyu 呂哲慶 碩士 國立交通大學 電信工程系所 94 This thesis presents three broadband balun designs which are fabricated on low dielectric substrates (eps=3.38 ) using conventional low cost PCB process. High even-mode impedances for coupled lines can be achieved by using Vertical Installed Planar ( VIP ) structures. The Marchand balun with two identical coupled lines can be designed using two methods: one is via the coupling, and the other is the even-odd mode impedances. Curves of the bandwidth versus the even-odd mode impedances for the 1:1 and 1:4 baluns are shown. The multisection impedance-transforming coupled-line baluns are analyzed by the quarter-wavelength coupled-line balun, and the design theory can be derived using the even-odd mode equivalent circuits and microwave network analysis. By cascading several coupled lines to increase the effective even-mode impedances, the even-mode excitations are rejected and the broadband baluns can be achieved. Using VIP coupled sections with even-mode impedance of 200Ω, the fabricated balun achieved 1-dB amplitude balance and phase balance over 100% bandwidth. The final broadband balun is consisted of a Wilkinson power divider and a pair of bandpass phase shifters. The amplitude and phase balanced are within 1dB and +-10 degree around 120% bandwidth, respectively. Chi-Yang Chang 張志揚 2006 學位論文 ; thesis 69 zh-TW |
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碩士 === 國立交通大學 === 電信工程系所 === 94 === This thesis presents three broadband balun designs which are fabricated on low dielectric substrates (eps=3.38 ) using conventional low cost PCB process. High even-mode impedances for coupled lines can be achieved by using Vertical Installed Planar ( VIP ) structures. The Marchand balun with two identical coupled lines can be designed using two methods: one is via the coupling, and the other is the even-odd mode impedances. Curves of the bandwidth versus the even-odd mode impedances for the 1:1 and 1:4 baluns are shown. The multisection impedance-transforming coupled-line baluns are analyzed by the quarter-wavelength coupled-line balun, and the design theory can be derived using the even-odd mode equivalent circuits and microwave network analysis. By cascading several coupled lines to increase the effective even-mode impedances, the even-mode excitations are rejected and the broadband baluns can be achieved. Using VIP coupled sections with even-mode impedance of 200Ω, the fabricated balun achieved 1-dB amplitude balance and phase balance over 100% bandwidth. The final broadband balun is consisted of a Wilkinson power divider and a pair of bandpass phase shifters. The amplitude and phase balanced are within 1dB and +-10 degree around 120% bandwidth, respectively.
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Chi-Yang Chang |
author_facet |
Chi-Yang Chang Jhe-Ching Lyu 呂哲慶 |
author |
Jhe-Ching Lyu 呂哲慶 |
spellingShingle |
Jhe-Ching Lyu 呂哲慶 Broadband Balance-to-Unbalance ( Balun ) Design |
author_sort |
Jhe-Ching Lyu |
title |
Broadband Balance-to-Unbalance ( Balun ) Design |
title_short |
Broadband Balance-to-Unbalance ( Balun ) Design |
title_full |
Broadband Balance-to-Unbalance ( Balun ) Design |
title_fullStr |
Broadband Balance-to-Unbalance ( Balun ) Design |
title_full_unstemmed |
Broadband Balance-to-Unbalance ( Balun ) Design |
title_sort |
broadband balance-to-unbalance ( balun ) design |
publishDate |
2006 |
url |
http://ndltd.ncl.edu.tw/handle/35571617266466281915 |
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