Waveguide/microstrip mode transducer

Details Waveguide/microstrip mode transducer Waveguide/microstrip mode transducer

1985-10-08

1987-06-16

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 21A, 333 33, H01P 5107

Patent

active

046738975

ABSTRACT:
A waveguide/microstrip mode transducer operable over a broad frequency range comprises a dielectric substrate (3) extending along an E-plane of a waveguide and having a conductive layer on each major surface, the two layers having three successive pairs of portions. A first pair (10, 11) form a microstrip line, a second pair (12, 13) form a balanced transmission line, and a third pair (14, 15) couple the portions (14, 15) of the balanced line to opposite walls (6, 7) of the waveguide. The microstrip line is coupled to the balanced line in a manner which is independent of frequency over the operating frequency range, rather than by a resonant balun; the strip conductor portion (10) and the ground plane conductor portion (11) of the microstrip line respectively are the same width as, and taper smoothly to the width of, the conductor portions (12, 13) of the balanced line connected thereto, and there are two regions (22, 23) respectively on opposite sides of the balanced line in which there is no conductor on both surfaces of the substrate (3 ) and which exhibit no resonance in the operating frequency range. In order to provide phase velocity matching between the waveguide and the transmission lines on the substrate (3), particularly when the substrate (3) has a high dielectric constant, the substrate (3) has a recess (24) of progressively increasing width along the waveguide.

REFERENCES:
patent: 3518579 (1970-06-01), Hoffman
patent: 3732508 (1973-05-01), Ito et al.
patent: 4157516 (1979-06-01), Van de Grijp
patent: 4260964 (1981-04-01), Saul
Van Heuven, J. C., "A New Integrated Waveguide-Microstrip Transition" Conference 4th European Microwave, Mortieux Switzerland (10-13 Sep. 74).

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