CPC H03H 11/16 (2013.01) [H04B 3/20 (2013.01); H04L 27/0002 (2013.01)] | 20 Claims |
1. A phase shifter comprising:
a coupler including an input terminal, a thru terminal, a first coupled line connected between the input terminal and the thru terminal, an isolation terminal, a coupling terminal, and a second coupled line connected between the isolation terminal and the coupling terminal;
an input port connected to the input terminal of the coupler and configured to receive a radio frequency input signal;
an output port connected to the coupling terminal of the coupler and configured to output a radio frequency output signal having a phase shift with respect to the radio frequency input signal; and
a first controllable reflective load connected to the thru terminal of the coupler and including a transmission line and a plurality of shunt switches each connected between a ground voltage and a different point along the transmission line, the plurality of shunt switches selectable to control the phase shift, the plurality of shunt switches connected to the transmission line at a plurality of points that are non-uniformly spaced.
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