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US4825222A Omnidirectional antenna with hollow point source feed 失效
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Omnidirectional antenna with hollow point source feed
摘要:
An omnidirectional antenna comprises a ring-shaped subreflector surrounding an omnidirectional feed and a ring-shaped main reflector for redirecting radiation from the subsidiary reflector to the target zone. The feed has a focal ring and a hollow centre to accommodate supports, feeders etc which facilitates stacking of antennas.
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