Communications: radio wave antennas – Antennas – Microstrip
Patent
1992-05-15
1993-08-31
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Microstrip
343848, H01Q 138
Patent
active
052413217
ABSTRACT:
An aperture coupled microwave antenna (10) for processing circularly polarized signals. The antenna (10) comprises a first planar dielectric layer (22) upon which a conductive radiating patch (12) is mounted. Attached to the radiating patch (12) are tuning means (20, 72) for converting linearly polarized signals into circularly polarized signals. The tuning means preferably takes the form of conductive tuning stubs (20). Abutting an opposite face (23) of the first dielectric layer (22) is a conductive ground plane (24) having two orthogonal elongated apertures (26, 28). The radiating patch (12) is electromagnetically coupled, through the two elongated apertures (26, 28), to two input/output ports (48, 56) by two conductive feeding circuits (38, 40). Each of the feeding circuits (38, 40) interacts with only one of the elongated apertures (26, 28, respectively). The two feeding circuits (38, 40) and the elongated apertures (26, 28) are designed to operate in isolation. This allows the antenna (10) of the present invention to simultaneously process two signals having different frequencies.
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Aksun, M. I., Chuang S. L., and Lo, Y. T., "Theory and Experiment of Electromagnetically Excited Microstrip Antennas for Circular Polarization Operation," 1989 IEEE AP-S International Symposium vol. II, Antennas and Propagation, Jun. 26-30,1989, pp. 1142-1145.
Aksun, M. I., Wang, Z. H., Chuang, S. L. and Lo, Y. T., "Ciruclar Polarization Operation of Double-Slot Fed Microstrip Antennas," 1989 IEEE AP-S International Symposium vol. II, Antennas and Propagation, Jun. 26-30, 1989, pp. 640-643.
Iwasaki, H. and Kawabata, K., "A Circularly Polarized Microstrip Antenna Using A Crossed-Slot Feed," 1990 Antennas and Propagation Symposium Digest, vol. II, May 7-11, 1990, pp. 807-810.
Radlo Edward J.
Space Systems Loral, Inc.
Wimer Michael C.
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