Communications: radio wave antennas – Antennas – Microstrip
Patent
1984-06-22
1986-11-18
Lieberman, Eli
Communications: radio wave antennas
Antennas
Microstrip
343727, 343776, H01Q 2128
Patent
active
046238948
ABSTRACT:
A dual band array antenna is disclosed having interleaved waveguide and dipole arrays, each operating in a different frequency band. The orientation of the waveguides and dipoles is such that polarization of the signals of the two frequency bands is perpendicular to each other, thus reducing mutual coupling. The waveguides are used for the higher frequency band and their cutoff frequency is selected to be above the lower frequency band at which the dipoles operate, in order to reduce mutual coupling into the waveguides. In one embodiment the dipoles are printed on a substrate having a dielectric constant selected so that dipole spacing is the same as the waveguide spacing. This eliminates grating lobe formation in the radiation pattern of the waveguide array. A low pass filter is included in the dipole feed circuit to reject the frequencies at which the waveguides operate. As a result of the invention, two beams of two different frequency bands are independently and simultaneously steerable in a single antenna aperture.
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J. K. Hsiao, Analysis of Interleaved Arrays of Waveguide Elements, IEEE Transactions on Antennas and Propagation, vol. AP-19, No. 6, Nov., 1971, pp. 730-735.
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Chu Ruey S.
Clark James U.
Lee Kuan M.
Tang Raymond
Wong Nam S.
Hughes Aircraft Company
Karambelas Anthony W.
Lambert Howard R.
Lieberman Eli
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