Patent ID: 7498999

Claim:
A system for selective phase shifting, comprising: an input port configured to receive an RF signal; a straight-through path coupled to the input port and including a first RF switch; a long path of predetermined length coupled to the input port and including a second RF switch coupled to a ground, the long path comprising a first delay path and a second delay path; a delay element coupled to the first and second delay paths in series with the second RF switch; the first delay path comprising a first trace line of ¼-wavelength of the RF signal less a phase delay of the delay element; the second delay path comprising a second trace line of ¼-wavelength of the RF signal less a phase delay of the delay element; the first delay path and the second delay path selectively coupled to ground by application of a forward bias to the second RF switch; and an output port coupled to the straight-through path and the long path.