Patent ID: 8344826

Claim:
A phased-array antenna filter and diplexer for a cellular communication system, comprising: a signal divider tee diplexer including a tee branch point, an antenna port, a diplexer transmit port and a diplexer receive port; a receive filter including a maximally-flat, multi-pole bandpass filter, a receive input port and a receive output port, the receive input port coupled to the diplexer receive port to define a receive signal path, from the tee branch point to the receive input port, having a length of approximately one quarter receive wavelength; and a transmit filter including a folded, multi-pole bandpass filter, a transmit input port and a transmit output port, the transmit output port coupled to the diplexer transmit port to define a transmit signal path, from the tee branch point to the transmit output port, having a length of approximately one quarter transmit wavelength, wherein the antenna port transfers signal energy bidirectionally with at least one radiator stack of an antenna.