Location of Multiple Transmission Zeros by Tap-Coupling Technique for Bandpass Filters and Duplexers Using Short-Ended λ/2 Resonators(Passive(Filter))(<Special Issue>Recent Trends on Microwave and Millimeter Wave Application Technology)
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概要
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In this paper, the method of locating multiple transmission zeros by the tap-coupling technique is described for bandpass filters (BPFs), using short-ended λ/2 resonators and its application to a duplexer. First, the method of locating the transmission zero using the short-ended λ/2 resonators is examined with various excitation methods. We focus on four types of short-ended λ/2 resonators: the end-coupling type, tap-coupling type, capacitive tap-coupling type and inductive tap-coupling type. Secondly, the BPFs based on the basic characteristics of the respective resonators are proposed and designed on the basis of a general filter theory with narrow band approximation. Lastly, we propose and design new duplexers consisting of the proposed BPFs. The results lead to the conclusion that the basic characteristics of the short-ended λ/2 resonators are useful for realizing a BPF with multiple transmission zeros and a high-performance duplexer fabricated without increasing the number of elements.
- 社団法人電子情報通信学会の論文
- 2003-12-01
著者
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HASHIMOTO Osamu
Aoyama Gakuin University
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Hashimoto Osamu
Aoyama Gakuin Univ. Sagamihara‐shi Jpn
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Wada Kouji
Aoyama Gakuin University
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Wada K
Department Of Bioscience And Biotechnology Faculty Of Agriculture University Of The Ryukyus
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Wada K
Univ. Electro‐communications Chofu‐shi Jpn
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Hashimoto O
Department Of Electrical And Electronic Engineering Aoyama Gakuin University
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AIHARA Yoshiyuki
Aoyama Gakuin University
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KAMIYAMA Tomohide
Aoyama Gakuin University
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Wada Koji
Department Of Bioscience And Biotechnology Faculty Of Agriculture University Of The Ryukyus
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Wada Koji
Faculty Of Agriculture University Of The Ryukyus
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Hashimoto Osamu
Department of Electrical and Electronic Engineering, Aoyama Gakuin University
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