Filter circuit and radio communication device

Details Filter circuit and radio communication device Filter circuit and radio communication device

2009-09-10

2011-10-18

Ham, Seungsook (Department: 2817)

Wave transmission lines and networks

Miscellaneous

Multipactor applications

C333S202000

Reexamination Certificate

active

08040203

ABSTRACT:
The present invention provides a filter circuit that can achieve both sharp bandpass characteristics and high power handling capability. The filter circuit includes: an input terminal that has a signal input; a four-port device that divides input signals; a band stop filter that has the center frequency of the input signals within the stopband, and causes the out-of-stopband signals among the input signals to pass; two bandstop resonators circuits that cause the signals passing through the band stop filters to pass, and reflect the signals; open ends that are connected in parallel to the two bandstop resonators circuits; and an output terminal that outputs the signals reflected by the band stop filters and the bandstop resonators circuits and combined at the four-port device.

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Honjoh, et al. Synthesis of Microwave Circuits by Normal Mod Expansion—Synthesis of Rectangular Waveguide Filter with Dielectric Sheet Window. IEICE Technical Report. 1982. pp. 9-16.
Kato, et al. Studies on the equivalent circuits of dual-mode rectangular waveguide filters using HFSS and MDS. IEICE Technical Report. 1998. pp. 73-80.

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