End launched microstrip or stripline to waveguide transition wit

Details End launched microstrip or stripline to waveguide transition wit End launched microstrip or stripline to waveguide transition wit

1994-05-23

1998-03-10

Lee, Benny T.

Communications: radio wave antennas

Antennas

With aircraft

343767, 343772, 343789, 333 26, 333 33, H01Q 128, H01P 5107

Patent

active

057266646

ABSTRACT:
A low profile, compact microstrip-to-waveguide or stripline-to-waveguide transition. The end of the waveguide is terminated in a cavity backed slot defined in a groundplane formed on a dielectric substrate. The slot is excited by a microstrip or stripline conductor defined on the opposite side of the substrate. The conductor is terminated in a T-shaped junction including two opposed arms extending along the slot, each having a length equal to one-quarter wavelength at the center frequency of operation. A cavity covers the substrate on the conductor side, and is sized so that no cavity modes resonate in the frequency band of operation. The transition is matched by appropriate selection of the length of the slot and the length and position of the microstrip.

REFERENCES:
patent: 2887429 (1959-03-01), Sommers et al.
patent: 2942263 (1960-06-01), Baldwin
patent: 3710338 (1973-01-01), Munson
patent: 4197545 (1980-04-01), Favaloro et al.
patent: 5198786 (1993-03-01), Russell et al.
patent: 5414394 (1995-05-01), Gamand et al.
IEEE Transactions on Microwave Theory and Techniques, vol. 34, No. 3, Mar. 19867 New York US, pp. 321-327, Das et al. `Excitation of waveguide by stripline-and microstrip-line-fed slots` *figure 1*.
Patent Abstracts of Japan vol. 6 No. 151 (E-124), 11 Aug. 1992 & JP-A-57 075002 (Hitachi Ltd.) 11 May 1982, *abstract*.

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