Dual band combiner arrangement

Details Dual band combiner arrangement Dual band combiner arrangement

1999-06-08

2000-09-12

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333204, H01P 1213

Patent

active

061183555

ABSTRACT:
A dual band combiner for combining two frequency bands having a 2:1 relationship, e.g. 900 MHz and 1800 MHz. The combiner comprises an upper frequency bandpass filter section and an upper frequency bandstop filter. The bandpass filter section comprises two open-end resonators whose lengths are 1/2 wavelength of the upper frequency band, and the bandstop filter comprises three open-end resonators whose lengths are 1/4 wavelength of the upper frequency band. Because of the 2:1 frequency relationship pronounced selectivity-enhancing transmission zeros are produced at the lower frequency band, thereby providing a combiner that has high isolation between ports while maintaining low insertion loss.

REFERENCES:
patent: 2965752 (1960-12-01), Medford et al.
patent: 5023866 (1991-06-01), De Muro
patent: 5281934 (1994-01-01), Shiau et al.
patent: 5652599 (1997-07-01), Pitta et al.

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