Dual-band bandpass filter

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

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Details

C333S202000, C333S204000, C333S222000, C333S02400C

Reexamination Certificate

active

07116186

ABSTRACT:
A dual-band bandpass filter having a first pass band and a second pass band respectively corresponding to a first frequency and a second frequency. The filter includes a first pair of resonators, a second pair of resonators and a first coupling element. The first pair of resonators includes a first resonator and a second resonator, which share a first grounding transmission line and are grounded through the first grounding transmission line to generate coupling. The second pair of resonators includes a third resonator and a fourth resonator, which share a second grounding transmission line and are grounded through the second grounding transmission line to generate coupling. The first coupling element connected between the first and second pairs of resonators makes the first and second pairs of resonators produce coupling such that the dual-band bandpass filter has the first and second pass bands.

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