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An Empirical Study of a Coplanar Bandpass Filter with Attenuation Poles Using Short-Ended Half-Wavelength Resonators
Kouji WADA Yoshiyuki AIHARA Osamu HASHIMOTO Hiroshi HARADA
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/02/01
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
short-ended half-wavelength resonator, tap-coupling, attenuation pole, bandpass filter, coplanar waveguide (CPW),
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Basic characteristics of a short-ended half-wavelength resonator made of a coplanar waveguide (CPW) and their applications to bandpass filters (BPFs) are discussed. The first part of this paper gives the essence for improving out-of-band characteristics of the BPF by describing the basic characteristics of a tap-coupled resonator. Secondly, a new BPF with attenuation poles using the short-ended half-wavelength CPW resonators is proposed and realized. It is confirmed that our methodology is useful for improving out-of-band characteristics of the BPF using the short-ended half-wavelength CPW resonators without complicated filter design.