Waveguide to microstripline polarization converter having a coupling patch
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United States of America Patent
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Aug 27, 1991
Grant Date -
N/A
app pub date -
Jun 21, 1989
filing date -
Jul 8, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A capacitively coupled printed patch (3) as a high efficiency device to couple orthogonally polarized energy between a microstripline (5) and a waveguide (1). Coupling between the microstripline (5) and the patch (3) is achieved by the microstripline terminating in a narrow strip probe (4), the end of which lies close to, but not in contact with, an edge of the patch (3). Two separate probes (4) arranged mutually orthogonally are used to effect independent polarized couplings to produce independent linear orthogonal signals or independent left- and right-handed circularly polarized signals. The microstriplines (5) and patch (3) are supported on a common substrate (8) which extends transversely through the waveguide (1). The waveguide wall has a quarter-wavelength thickness (T) so that its inner edge (10) appears continuous to energy passing through the substrate (8). One application is in a satellite TV receiving system where it is required to isolate two signals sharing a common channel but having orthogonal polarizations.
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