Band-pass filter having a ring resonator

Details Band-pass filter having a ring resonator Band-pass filter having a ring resonator

2011-05-17

2011-05-17

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S204000

Reexamination Certificate

active

07944327

ABSTRACT:
A bandpass filter is described herein. The bandpass filter has two parallel signal branches, each connected, on an input side, to an input node and, on an output side, to an output node. The two signal branches form a ring resonator, having a wave mode with a complex amplitude of {right arrow over (U)}CW=|{right arrow over (U)}CW|exp{−jφCW} propagating in a clockwise direction and a wave mode with a complex amplitude of {right arrow over (U)}CCW=|{right arrow over (U)}CCW|exp{−jφCCW} propagating in a counterclockwise direction. The vector sum of a resulting wave {right arrow over (U)}outat the output node of the bandpass filter at two or more stop frequencies is: {right arrow over (U)}out={right arrow over (U)}CW+{right arrow over (U)}CCW=0, and |{right arrow over (U)}CW|=|{right arrow over (U)}CCW| and |φCW−φCCW|=180°. The stop frequencies are arranged such that a passband is formed between two stop frequencies.

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