High frequency filter having a solid circular shape...

Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – High frequency waveguides – resonators – electrical networks,...

Reexamination Certificate

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C333S0990MP, C333S204000, C333S205000, C333S219000

Reexamination Certificate

active

07907984

ABSTRACT:
A resonance pattern (21) made of conductive material and having a circular plan shape is formed over the principal surface of a dielectric substrate. First and second virtual straight lines mutually crossing at a right angle are defined. A first input port (22) and a first output port (23) are electromagnetically coupled to the resonance pattern at two cross points between the first virtual straight line and an outer circumference line of the resonance pattern. A second input port (24) and a second output port (25) are electromagnetically coupled to the resonance pattern at two cross points between the second virtual straight line and the outer circumference line of the resonance pattern. A first inter-port waveguide (26) propagates a high frequency signal output to the first output port to the second input port.

REFERENCES:
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patent: 5400002 (1995-03-01), Takahashi et al.
patent: 5512539 (1996-04-01), Matsuura et al.
patent: 5748059 (1998-05-01), Yabuki et al.
patent: 6360112 (2002-03-01), Mizuno et al.
patent: 6546266 (2003-04-01), Okazaki et al.
patent: 6980841 (2005-12-01), Kai et al.
patent: 2007/0229183 (2007-10-01), Akasegawa et al.
patent: 2006-115416 (2006-04-01), None

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