System and method for increasing the isolation characteristic of

Details System and method for increasing the isolation characteristic of System and method for increasing the isolation characteristic of

1998-02-20

2000-05-30

Wong, Don

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343797, H01Q 928, H01Q 2126

Patent

active

060695900

ABSTRACT:
An antenna having feedback elements for improving the isolation characteristic of the antenna by generating a feedback signal that operates to cancel an undesired leakage signal coupling from an input port to an output port of the antenna system. The antenna can include a distribution network for electrically coupling the electromagnetic signals from and to radiating elements and a radome structure for protecting both the radiating elements and the distribution network from exposure to the operating environment of the antenna. The radome structure can include feedback elements for electrically cooperating with the radiating elements of the antenna system. Electromagnetic signals transmitted by the radiating elements can be coupled to the feedback elements, which results in the feedback elements resonating at the frequency of the transmitted electromagnetic signals. These resonating feedback elements can generate a feedback signal that, in turn, is received by the radiating elements. The feedback signal, when combined with the undesired leakage signal at the output port, cancels both signals, thereby achieving an antenna system having an improved isolation.

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Teichman, M.A., "Designing Wire Grids for Impedance Matching of Dielectric Sheets", The Microwave Journal, Apr., 1968, pp. 73-78.

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