Coupling structure, resonator excitation structure and...

Wave transmission lines and networks – Resonators

Reexamination Certificate

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C333S208000, C333S204000

Reexamination Certificate

active

07397331

ABSTRACT:
A coupling structure for coupling to a circuit portion (6) in a coplanar-waveguide circuit (1) having ground conductors (2, 3) at both sides is disclosed. A signal input/output line (4) is provided at the center of the coplanar-waveguide circuit; and an inductive coupling portion (5) having an end of the signal input/output line short-circuited to one of the ground conductors and facing a part of the circuit portion via a first gap is also provided.

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patent: 6262640 (2001-07-01), Tsujiguchi
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patent: 0 431 234 (1991-06-01), None
patent: 1 562 255 (2005-08-01), None
Ma et al “Low Loss 5GHz Bandpass Filter Using HTS Coplanar Waveguide Quarter Wavelenght Resonator” 2002, IEEE MTT-S Digest, pp. 1967-1970.
Daisuke Koizumi, et al., “A 5-GHz Band Coplanar-Waveguide High Temperature Superconducting Filter Employing T-Shaped Input/Output Coupling Structure and Quarter-Wavelength Resonator”, Technical Report of IEICE, MW 2004-25, May 2004, pp. 55-60.
Tamio Kawaguchi, et al., “Design of a 5GHz Bandpass Filter Using CPW Quarter-Wavelength Spiral Resonators”, Proceedings of the 2004 IEICE Society Conference, C-2-81, Figs. 4 (a),(b), Nov. 2004, p. 97.
Tamio Kawaguchi, et al., “Design of a 5GHz Interdigital Bandpass Filter Using CPW Quarter-Wavelength Resonators”, Proceedings of the 2004 IEICE Society Conference, C-2-80, Fig. 4, Nov. 2004,p. 96.
Tamio Kawaguchi, et al., “A 5GHz Interdigital Bandpass Filter Using CPW Quarter-Wavelength Resonators”, Technical Report of IEICE, MW 2005-2, Apr. 2005, pp. 7-10 (with English Abstract).
Daisuke Koizumi, et al., “Experimental Investigation on a 5-GHz band interdigital bandpass filter using CPW quarter-wavelength resonators”, Technical Report of IEICE, MW2005-3, Apr. 2005, pp. 11-14 (with English Abstract).

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