Communications: radio wave antennas – Antennas – Slot type
Patent
1981-02-18
1984-02-14
Lieberman, Eli
Communications: radio wave antennas
Antennas
Slot type
343836, H01Q 1310, H01Q 19185
Patent
active
044319975
ABSTRACT:
Image element antennas are well known for their relatively small size and highly directive radiation patterns. Such antennas, however, have an inherent disability in that the mechanism responsible for high directivity is inoperable at a certain angle, thereby producing a sidelobe into which relatively large amounts of power are radiated. The present invention involves an improved element for use in image element antennas which avoids radiating any substantial amounts of power into this sidelobe. A preferred embodiment of the invention provides a doublet element having a minimum of radiated power at the angle of the sidelobe, thus avoiding the need for the multiple reflection-transmission mechanism which fails at this angle.
REFERENCES:
patent: 2654842 (1953-10-01), Engelman
patent: 2877427 (1959-03-01), Butler
Von Trentini, "Partially Reflecting Sheet Arrays"; IRE Trans. on Ant. _& Prop., Oct. 1956, pp. 661-671.
Immell Raymond G.
Sasser Bill H.
Lieberman Eli
Meyer Jonathan P.
Motorola Inc.
Parsons Eugene A.
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