Communications: radio wave antennas – Antennas – Slot type
Patent
1985-09-23
1987-07-21
Nussbaum, Marvin L.
Communications: radio wave antennas
Antennas
Slot type
343873, 343783, 343785, 343909, H01Q 1318, H01Q 1510
Patent
active
046821805
ABSTRACT:
The present invention relates to a multidirectional feed which can be used by itself or preferably incorporated within a surface wave structure to form a flush-mounted antenna on, for example, a mobile unit. The feed arrangement comprises a ground plane including an annular cavity with a smaller annular slot. The annular slot is connected by multiple, spaced-apart, leads to an associated transceiver. The annular cavity is also formed to prevent both a shorting of the radio waves therein and the radio waves from propagating away from the cavity in a direction opposite the slot. A surface wave structure is disposed preferably with the feed centrally mounted and can comprise any suitable structure including annular corrugations and/or a dielectric layer to provide a flush-mounted antenna arrangement which provides radiation in azimuth in all directions with moderate elevation gain.
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American Telephone and Telegraph Company AT&T Bell Laboratories
Nussbaum Marvin L.
Pfeifle Erwin W.
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