Apparatus and method for varying the coupling of a radio frequen

Details Apparatus and method for varying the coupling of a radio frequen Apparatus and method for varying the coupling of a radio frequen

1993-05-04

1994-11-08

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333116, 333 171, H01P 518

Patent

active

053630718

ABSTRACT:
An apparatus and method for varying coupling of a radio frequency (RF) signal (408). This is advantageously used for increasing the dynamic range of a power detector (406) in an automatic power level control loop (403) of a transmission unit (404), while maintaining transmission unit efficiency at higher power levels. This is accomplished by selecting between a first operating mode of the RF coupler (405) having strong coupling, responsive to a first predetermined power level, such that the RF coupler (405) produces a first coupled RF signal (509) responsive to the RF signal (408) and a second operating mode of the RF coupler (405) having weak coupling, responsive to a second predetermined power level, such that the RF coupler (405) produces a second coupled RF signal (510) responsive to the RF signal (408).

REFERENCES:
patent: 4571545 (1986-02-01), Griffin et al.
patent: 5006821 (1991-04-01), Tam et al.
patent: 5126686 (1992-06-01), Tam

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