Extended bandwidth dual-band patch antenna systems and associated methods of broadband operation

摘要: Patch antenna systems for half-duplex communications which are capable of providing a positive gain, quasi-hemispherical pattern over widely separated transmit and receive frequency bands. The according to the present invention generally comprise patch antenna, and/or circuit branches tuning resonate in separate bands, disconnection means electrically isolating branch from during periods reception transmission. Matching means, preferably implemented as part branches, may also be provided increasing operating bandwidth both In preferred embodiment, transmits receives circularly polarized waveforms, fed by single feed or quadrature via orthogonally located points.