Filter device for transmitter-receiver antenna

Details Filter device for transmitter-receiver antenna Filter device for transmitter-receiver antenna

1993-07-27

1994-12-20

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333206, 333222, H01P 1213

Patent

active

053749065

ABSTRACT:
A filter device for a transmitter-receiver antenna includes a transmission side filter having resonators and a reception side filter having resonators. Each of the transmission side resonators has a first characteristic impedance ratio other than one. On the other hand, each of the reception side resonators has a second characteristic impedance ratio being set to a value which prevents spurious resonance of the reception side filter at an integral multiple of a fundamental resonance frequency of the transmission side filter, so as to avoid the situation where spurious components increase at the above-noted integral multiple in a frequency characteristic of the transmission side filter being affected by a frequency characteristic of the reception side filter.

REFERENCES:
patent: 4506241 (1985-03-01), Makimoto et al.
patent: 4985690 (1991-01-01), Eguchi et al.
patent: 5065119 (1991-11-01), Jackowski
patent: 5124676 (1992-06-01), Ueno
patent: 5250916 (1993-10-01), Zakman

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