Microwave coupler with high isolation and high directivity

Details Microwave coupler with high isolation and high directivity Microwave coupler with high isolation and high directivity

1981-04-28

1983-03-15

Gensler, Paul L.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333238, H01P 518

Patent

active

043769217

ABSTRACT:
A loosely coupled microstrip microwave coupler with high directivity is disclosed. The coupler comprises a ground plane substrate, a dielectric layer disposed over the substrate, and a section of each of the main and coupled transmission lines disposed on the exposed surface of the dielectric layer adjacently aligned with a predetermined gap therebetween to form a coupling region. The length of the coupling region is substantially less than 1/4 wavelength of the operating microwave signal. A capacitive coupling element is disposed within the coupling region across the main and coupled transmission line sections for supplementing the dielectric capacitive coupling of the gap therebetween to increase the directivity of the microwave signal coupling. The capacitive coupling element splits the coupled transmission line section of the coupling region into two branches and is physically adjustable in size to balance the electric and magnetic field microwave coupling components of one of the branches to reduce the microwave power output thereof. As a result, the microwave power output of the other of the branches is representative of the microwave signal incident on the main transmission line section substantially.

REFERENCES:
patent: 2770779 (1956-11-01), Turner
patent: 3593208 (1971-07-01), Smith
patent: 4011528 (1977-03-01), Podell et al.
patent: 4027254 (1977-05-01), Gunton et al.
patent: 4216446 (1980-08-01), Iwer

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