Patent ID: 7233217
Filing Date: 2007-06-19
Classification: H01P,H01Q

Abstract:
1. A dual wiper element phase shifter comprising: a first coupling arm for effecting variable electrical phase shift between outputs of a first RF feed line, a first wiper element, a first coupling ring for capacitively coupling the first coupling arm to an input of the RF feed line, and a first mid portion connecting the first coupling ring to the first wiper element, the first coupling arm being rotatable about a first axis centered relative to the first coupling ring; a second coupling arm for effecting variable electrical phase shift between outputs of a second RF feed line, a second wiper element, a second coupling ring for capacitively coupling the second coupling arm to an input of the second RF feed line, and a second mid portion connecting the second coupling ring to the second wiper element, the second coupling arm being rotatable about a second axis centered relative to the second coupling ring; and a single-mesh geared mechanical linkage coordinating rotation of the first and second coupling arms to provide coordinated electrical phase shift to RF signals propagating on the first and second RF feed lines.