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Turnstile slot antennaA turnstile slot antenna is disclosed, the antenna being for and integral with a spacecraft having a substantially cylindrical body portion. The antenna comprises a circumferential slot about the periphery of the spacecraft body portion with an annular wave guide cavity defining a radial transmission line disposed within the spacecraft body portion behind and in communication with the circumferential slot. Feed stubs and associated transmission apparatus are provided to excite the annular cavity in quadrature phase such that an omnidirectional, circularly polarized, rotating radiation pattern is generated. The antenna of the instant invention has utility both as a transmitting and receiving device, and ensures continuous telemetry and command coverage with the spacecraft.
Document ID
19740012751
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Munson, R. E. (Ball Brothers Res. Corp. Boulder, Colo., United States)
Date Acquired
September 3, 2013
Publication Date
April 16, 1974
Subject Category
Structural Mechanics
Accession Number
74N20864
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,805,266|NASA-CASE-GSC-11428-1
Patent Application
US-PATENT-APPL-SN-292685

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