Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1994-04-25
1995-10-24
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Plural separate diverse type
343767, 343705, H01Q 2100, H01Q 2124, H01Q 1310
Patent
active
054613922
ABSTRACT:
Low frequency radiating elements are embedded in a flared notch array. The flared notch array forms a series of parallel troughs in which absorptive loads are placed to reduce the antenna radar cross section. The low frequency radiating elements are embedded in the array transverse to the troughs at or below the level of the absorptive loads, and excite several troughs. The absorptive load material is absorptive in the operating band of the flared notch array, but appears as a relatively low loss dielectric at the lower frequencies of operation of the low frequency radiating elements. The low frequency radiating elements can perform Identify Friend or Foe functions in the UHF and L-band regions of the spectrum, while the flared notch array operates at X-band.
REFERENCES:
patent: 5220330 (1993-06-01), Salvail et al.
patent: 5227808 (1993-07-01), Davis
patent: 5264860 (1993-11-01), Quan
"A Broadband Stripline Array Element," L. R. Lewis et al., IEEE AP-S Symposium, Jun. 1974, p. 35.
"Broadband Antenna Study," L. R. Lewis et al., Mar. 1975 Final Report, AFCRL-TR-75-0178, AD-A014862.
"The Taper Slot Antenna--A New Integrated Element for Millimeter-Wave Applications," K. S. Yngvesson et al., IEEE Transactions on Microwave Theory and Techniques, vol. 37, No., Feb. 1989, pp. 365-374.
"Radar Cross Section," E. F. Knott et al., Chapter 9, Artech House 1985.
Mott Charles J.
Quan Clifton
Alkov Leonard A.
Denson-Low W. K.
Hajec Donald T.
Hughes Aircraft Company
Le Hoang-anh
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