Planar antenna with patch radiators

Communications: radio wave antennas – Antennas – Microstrip

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343770, 343771, H01Q 0000

Patent

active

047558210

ABSTRACT:
A planar antenna includes a first slotted waveguide serving as a power-feed unit, and a second slotted waveguide of planar type coupled with the power-feed waveguide, for radiating circularly polarized microwaves into space. The second waveguide has a metal plate in which a two-dimensional slot array consisting of a plurality of rows of slots is formed. An insulative layer is provided on the second waveguide to cover the slot array. A plurality of rows of metal patch radiators are provided on the insulative layer. These patch radiators are electromagnetically coupled with the slots, respectively, in such a manner that each radiator is directly excited by the corresponding slot through the insulative layer, thereby radiating circularly polarized microwaves.

REFERENCES:
patent: 2479209 (1949-08-01), Chu
patent: 4213133 (1980-07-01), Hidaka
patent: 4518965 (1985-05-01), Hidaka
patent: 4686537 (1987-08-01), Hidaka et al.
IEEE Trans. Antennas Propagation, vol. AP-33, No. 12, pp. 1347-1353, "A Radial Line Slot Antenna for, 12 GHz Satellite TV Reception", Dec. 1985.
Microwave Journal, vol. 27, No. 7, pp. 147-149, "mm-Wave Oversized Cavity Slotted Array", Jul. 1984.
Antenna Engineering Handbook, Chap. 7, "Microstrip Antennas", McGraw-Hill Book Company, 1984.
National Convention Record, 1985 the Institute of Electronics and Communication Engineers of Japan, pp. 3-279, "Experiments on a Radial Line Antenna" Mar. 5, 1985.

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