| 摘要 |
<p>A phase shifter (10) includes a first rat-race ring (12) having four ports (14, 16, 18, 20), an input (22) coupled to a first one of the ports (14), an output coupled to a second one of the ports (20), a first resonant circuit (32, 34) coupled to a third one of the ports (16), and a second resonant circuit (50, 52) coupled to a fourth one of the ports (18), each of the first and second resonant circuits (32, 34, 50, 52) including a tunable dielectric varactor (940, 46, 58, 64). The first rat race ring (12) can be connected to another phase shifting stage including second rat race ring (82) or a digital switched line phase shifter (196).</p> |
