Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1989-12-08
1992-02-11
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343795, 343801, 343813, 343816, 343821, 343853, H01Q 21120, H01Q 21060, H01Q 9280, H01Q 9160
Patent
active
050879227
ABSTRACT:
In a printed circuit embodiment, dielectric boards in a multilayer arrangement have their ends protruding from a ground plane. Sets of printed dipole elements are disposed along the edge of each board. Each set of dipole elements has three feed ports. Bandpass filters are provided for each feed port. Phase shifters are coupled to each of the feed ports through its respective bandpass filter. At the low band, the outer feed ports are shorted by the filters so that the two sections of dipole elements to the left of the center feed port form one lone band dipole arm, and the two sections of dipole elements to the right of the center feed port form the other low band dipole arm. The low band dipole is driven at the center feed port. At the high band, the center feed port becomes an open circuit so that the two sections to the left thereof form one high band dipole, and the two sections to the right thereof form a second high band dipole. The two outer feed ports drive the dipole array at the high band. In an MMIC embodiment, printed circuit stubs are bridged across the outer feed ports. The length of each stub is one wavelength at the low frequency band, and one-and-one-half wavelengths at the high frequency band. At the low frequency, the stubs appear to be short-circuited. At the high frequency band, the terminals of the stubs provide a 180 degree phase difference for a balun.
REFERENCES:
patent: 2409944 (1946-10-01), Loughren
patent: 2655599 (1953-10-01), Finneburgh, Jr.
patent: 3680147 (1972-07-01), Redlich
patent: 4097868 (1978-06-01), Borowick
patent: 4912481 (1990-03-01), Mace et al.
"Experimental Results of a Multifrequency Array Antenna", J. E. Boyns et al., IEEE Transactions on Antennas and Propagation, Jan. 1972, pp. 106-107.
Chu Ruey S.
Lee Kuan M.
Tang Raymond
Brown Peter Toby
Denson-Low Wanda K.
Hughes Aircraft Company
Wimer Michael C.
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