Communications: radio wave antennas – Antennas – Slot type
Patent
1995-11-27
1997-07-15
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Slot type
343767, 3437925, H01Q 1310, H01Q 1110
Patent
active
056487860
ABSTRACT:
A cavity-backed slot array antenna is provided which offers wide frequency bandwidth in a conformal structure and further offers forward horizon coverage and wide angle beam scanning. The slot array antenna has a plurality of cavity-backed slot arrays. Each array contains a plurality of conductive cavities and radiating slots. The conductive cavities have varying size length and width in accordance with a log-periodic scale and, some conductive cavities have a maximum constant width. The slots are preferably formed in a folded configuration extending along a substantial portion of the width of the conductive cavity and further extend along a portion of the length of the conductive cavity one or more times. For a conductive cavity at maximum width, the corresponding slots are further extended in the effective overall length so as to further extend the frequency bandwidth, while maintaining a compact antenna structure.
REFERENCES:
patent: 3369243 (1968-02-01), Greiser
patent: 3633207 (1972-01-01), Ingerson
patent: 4594595 (1986-06-01), Struckman
patent: 4922262 (1990-05-01), Chow
patent: 5068670 (1991-11-01), Maoz
patent: 5337065 (1994-08-01), Bonnet et al.
patent: 5502453 (1996-03-01), Tsukamoto et al.
Paul G. Ingerson and Paul E. Mayes, "Log Periodic Antennas with Modulated Impedance Feeders", IEEE Transactions on Antennas and Propagation, vol. AP-16, No. 6, Nov. 6, Nov. 1968, pp. 633-642.
Chung Hsin-Hsien
Douglass Jeffrey A.
Hajec Donald T.
Ho Tan
TRW Inc.
Yatsko Michael S.
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