Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-12-30
1986-01-21
LaRoche, Eugene R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343422, 343 74, 333113, 333 21R, 333109, 333137, 333 21A, H01P 518, H04B 710
Patent
active
045660123
ABSTRACT:
A microwave coupler for coupling microwave energy from a first waveguide to a second waveguide disposed side by side along a propagation length includes a common coupling means, and specifically, orifices along the propagation length wherein the coupling orifices are sized to promote coupling of a favored field mode of electromagnetic energy according to a Bessel function distribution of energy along the length of the waveguide. The Bessel function distribution provides for wideband, low-loss coupling of the favored field mode and maximal isolation from non-favored field modes. The invention is particularly useful for extracting a type TE.sub.21 circular mode signal from a signal containing TE.sub.11 and TE.sub.21 circular modes wherein the TE.sub.21 mode signals are used for generating elevational and azimuthal tracking signals.
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Miller, "Coupled Wave Theory and Waveguide Applications." The Bell System Technical Journal, May 1954, pp. 661-719.
Miller, "On Solutions for Two Waves with Periodic Coupling," The Bell System Technical Journal, Oct. 1968, pp. 1801-1822.
Y. Choung et al., "Ku-Band Tracking Feed for Earth Terminal Operation," 1982 APS Symposium Digest, May 24-28, 1982, pp. 632-635.
Choung Younho
Goudey Kenneth R.
Allen Kenneth R.
Ford Aerospace & Communications Corporation
LaRoche Eugene R.
Lee Benny T.
Radlo Edward J.
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