|
For Full-Text PDF, please login, if you are a member of IEICE,
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
|
Miniaturized High-Temperature Superconductor Bandpass Filters Using Microstrip S-Type Spiral Resonators
Zhewang MA Tamio KAWAGUCHI Yoshio KOBAYASHI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E88-C
No.1
pp.57-61 Publication Date: 2005/01/01 Online ISSN:
DOI: 10.1093/ietele/e88-c.1.57 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics) Category: Keyword: high-temperature superconductor, microstrip spiral resonator, bandpass filter,
Full Text: PDF>>
Summary:
At frequencies currently used by mobile communications, many of the microstrip half-wavelength resonators are too large to realize miniaturized filters. For this reason, very small-sized microstrip spiral resonators and filters, using high-temperature superconductors (HTS), have been studied recently. In this paper, the resonant and coupling characteristics of microstrip G-type and S-type spiral resonators are investigated first by using an electromagnetic simulator. Then small-sized 4-pole, 8-pole, and 16-pole Chebyshev bandpass filters using S-type spirals are designed, respectively, with a midband frequency f0 = 1.93 GHz. The frequency responses of the filters satisfy well the desired specifications, and the measured frequency response of the 8-pole HTS filter agrees well with the theoretical prediction.
|
|