A phase shifter comprises a differential quadrature all-pass filter (QAF) including a balanced input port and two balanced output ports. A quadrature phase shift is manifested between the balanced output ports. The phase shifter also comprises a resistance-capacitance polyphase filter (PPF) section defining two balanced input ports and two balanced output ports. The balanced input ports of the PPF are coupled to the balanced output ports of the QAF. The combination exhibits broad bandwidth and relatively low ohmic loss.
申请公布号
US8552782(B1)
申请公布日期
2013.10.08
申请号
US201113307930
申请日期
2011.11.30
申请人
TRUEHEART WILLIAM G.;DAVIS BRANDON R.;LOCKHEED MARTIN CORPORATION