Dual band combiner arrangement

Details Dual band combiner arrangement Dual band combiner arrangement

H - Electricity

04

J

H04J 1/08 (2006.01) H01P 1/213 (2006.01)

Patent

CA 2273669

A dual band combiner for combining two frequency bands having a 2:1 relationship, e.g. 900MHz and 1800MHz. The combiner comprises and upper frequency bandpass filter section and an upper frequency bandstop filter. The bandpass filter section comprises two open-end resonations 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.

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