Split band filter for cellular mobile radio

Details Split band filter for cellular mobile radio Split band filter for cellular mobile radio

1986-05-23

1988-11-08

Masinick, Michael A.

Telecommunications

Carrier wave repeater or relay system

With frequency conversion

455 20, 455314, 455315, 455339, H04B 714

Patent

active

047838434

ABSTRACT:
A split band filtering scheme to reduce adjacent band interference in a communications network, such as a cellular mobile radio system, is disclosed. A repeater, interposed between a base or cell site and a mobile/portable radio, includes a down converter for converting a system operating frequency to a lower frequency signal. The lower frequency signal represents a communications band. The signal is presented to a split band filter having a narrow passband with steep skirts. The processed signal is coupled to an up converter where it is restored to the system operating frequency. In this way, the passband of the repeater is restricted to that of the desired communications band and adjacent band interference is reduced or eliminated.

REFERENCES:
patent: 2407213 (1946-09-01), Tunick
patent: 2871294 (1959-01-01), Stachiewicz
patent: 4001691 (1977-01-01), Greenberg
"Electronic Industries", pp. 58-63, 11/1965.

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