Realization of Low Spurious Responses by Various Bandpass Filters Using Open-Ended λ/2 Resonators

Kouji WADA  Takanobu OHNO  Kouichi NAKAGAWA  Osamu HASHIMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.12   pp.2394-2402
Publication Date: 2003/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Trends on Microwave and Millimeter Wave Application Technology)
Category: Passive(Filter)
open-ended λ/2 resonator,  bandpass filter,  point-coupling technique,  low spurious responses,  attenuation poles,  

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This paper focuses on the realization of low spurious responses by various bandpass filters (BPFs) using open-ended λ/2 resonators. The first part of this paper gives the resonance characteristics of the open-ended λ/2 resonators when the excitation methods are chosen. Secondly, various BPFs obtained with our methodology are provided. For constructing the BPF, (1) point-coupled resonators, (2) comb-line resonators, (3) quasi comb-line resonators and (4) parallel-coupled resonators are used. It is verified that the presented BPFs can be used to obtain low spurious responses both theoretically and experimentally.