RF coupler having non-overlapping off-set coupling lines

Details RF coupler having non-overlapping off-set coupling lines RF coupler having non-overlapping off-set coupling lines

1989-09-14

1991-04-09

Lee, Benny T.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333117, H01P 518

Patent

active

050068210

ABSTRACT:
An improved radio frequency (RF) coupler for providing two or more secondary signals from a primary RF signal. The RF coupler has a primary coupling element and two or more secondary coupling elements for providing the two or more secondary signals. The secondary RF coupling elements are offset and nonoverlapping with respect to one another along the axis of the primary coupling element so as to reduce the cross coupling and interference between the secondary elements. The offset relationship between secondary coupling elements allows for optimal design control over the coupling between each secondary coupling element and the primary coupling element. In one embodiment, the spatial area required for the coupling elements is reduced by introducing U-shaped portions in the primary coupling element and at least one of the secondary coupling elements. In another embodiment, the secondary coupling elements are provided on separate substrates to further reduce cross interference.

REFERENCES:
patent: 2531438 (1950-11-01), Jones
patent: 2775740 (1956-12-01), Oliver
patent: 3297967 (1967-01-01), Hunton
patent: 3721912 (1973-03-01), Ross
patent: 3990150 (1976-12-01), Caragliano et al.
patent: 4423392 (1983-12-01), Wolfson
patent: 4692721 (1987-09-01), Ito et al.

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