Title:
IMPROVED PHASE SHIFTER WITH COMMONLY DRIVEN PHASE SHIFTERS
Document Type and Number:
WIPO Patent Application WO2005022601
Kind Code:
A8
Abstract:
A wiper-type phase shifter with a cantilever shoe that ensures that the electrical contact on the wiper arm remains in electrical communication with the transmission trace located on the antenna backplane without relying to an element, such as a spring-loaded set screw, that passes through the backplane. The cantilever shoe thus provides a wiper hold-down mechanism without requiring holes or slots through the backplane, which could allow rain or other elements to get inside the antenna enclosure. A dual-polarization antenna that includes a wiper-type phase shifter for each polarization. The wiper arms define gear portions that engage each other, which allows a single actuator, typically located on the rear of the backplane opposite the location of the wiper arms, to drive both wiper arms in a coordinated manner. The antenna is suitable for use as a wireless base station antenna.
Inventors:
JANOSCHKA DARIN N
Application Number:
PCT/US2004/028109
Publication Date:
October 12, 2006
Filing Date:
August 27, 2004
Export Citation:
Assignee:
EMS TECHNOLOGIES INC (US)
JANOSCHKA DARIN N
JANOSCHKA DARIN N
International Classes:
H01Q9/16; H01P1/20
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