Dual frequency circularly polarized microwave antenna
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United States of America Patent
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Aug 31, 1993
Issued Date -
N/A
app pub date -
May 15, 1992
filing date -
May 15, 1992
priority date (Note) -
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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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