Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2005-12-29
2011-12-20
Lee, Benny (Department: 2817)
Communications: electrical
Selective
Interrogation response
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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Choi Gil-Young
Choi Won-Kyu
Pyo Cheol-Sig
Shin Chan-Soo
Son Hae-Won
Electronics and Telecommunications Research Institute
Lee Benny
Rabin & Berdo P.C.
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