Communications: radio wave antennas – Antennas – Microstrip
Patent
1989-01-23
1990-04-17
Hille, Rolf
Communications: radio wave antennas
Antennas
Microstrip
343853, H01Q 138
Patent
active
049184571
ABSTRACT:
A generally planar antenna formed in strip transmission line comprises a two-dimensional array of antenna elements (11) coupled to a plurality of secondary feeders (10) each coupled at at least one end to a primary feeder (4). In order that the level of coupling between the primary feeder (4) and each secondary feeder (10) should be well-defined and, when there is a large number of elements, suitably low, the coupling means therebetween are shielded and non-conductive, suitably a directional coupler (17). To provide the shielding, the primary feeder (4) and coupling means may be formed in double-ground-plane line. In an arrangement suitable for an antenna wherein power may be supplied to either end of the primary feeder (4) to give radiation patterns having single main lobes with different angular orientations, for example for a Doppler navigation system, one port of each directional coupler (17) may have an open-circuit reflective termination. For a simple design in which the proportion of power coupled into the secondary feeders (10) varies along the primary feeder (4), the coupling value of the coupling means may vary step-wise from one group of adjacent secondary feeders (10) to another.
REFERENCES:
patent: 4203116 (1980-05-01), Lewin
patent: 4376921 (1983-03-01), Dickens et al.
patent: 4423392 (1983-12-01), Wolfson
patent: 4475107 (1984-10-01), Makimoto et al.
McDonough, J. A., "Recent Developments in the Study of Printed Antennas", IRE National Convention Record, 5, pt. 1, pp. 173-176, 1957.
Bazire, T. W. et al., "A Printed Antenna/Radome (Radant) for Airborn Doppler Navigations Radar", IEE Conference on Antennas for Aircraft and Spacecraft.
London, IEE Conf. Pub. No. 128, pp. 35-40, Jun. 1975.
Scorer, M., Adams, B. J., "Printed Circuit Antenna for a Doppler Navigator", Colloquium on Advances in Printed Antenna Design and Manufacture, IEE Colloquium Digest n 1982/19., pp. 7.1-7.8, 1982.
Hille Rolf
Johnson Doris J.
Kraus Robert J.
U.S. Philips Corporation
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