Transmit/receive antenna system having offset feed points...

Communications: electrical – Selective – Interrogation response

Reexamination Certificate

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C340S572700, C343S756000, C333S117000, C333S02100R

Reexamination Certificate

active

08081062

ABSTRACT:
Provided is an antenna system with high isolation. The high-isolation antenna has transmission ports of a transmission antenna and reception ports of a reception antenna highly isolated from each other by using quadrature hybrid couplers. The antenna system includes: a transmission antenna having two feed points for transmitting signals; a reception antenna having two feed points for receiving signals; a transmission hybrid coupler which is connected to the two feed points of the transmission antenna and transmits transmission signals which have a phase difference of 90° with each other; and a reception hybrid coupler which is connected to the two feed points of the reception antenna and receives reception signals which have a phase difference of 90° with each other. The signals leaking from the two feed points of the transmission antenna to the two feed points of the reception antenna are offset.

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Parker et al., “Dual Polarized Microstrip Ring Antenna with Good Isolation” Electronic Letters, vol. 34, No. 11, pp. 1043-1044, May 1998.

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