Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1998-03-22
2000-05-09
Le, Hoanganh
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
343700MS, 343770, H01Q 2100
Patent
active
060610352
ABSTRACT:
A frequency-scanned end-fire phased-array antenna includes a board, a sinuous transmission line formed on the board, a plurality of end-fire antennas, and a plurality of couplers corresponding to the end-fire antennas, such that the transmission line is selectively coupled to the plurality of end-fire antennas via the plurality of couplers, for selectively coupling energy within the transmission line to the end-fire antennas. By varying the input frequency to the antenna over a narrow range, the direction of a main radiation beam emitted by the antenna can be scanned .+-.90 degrees from broadside. A single antenna board produces a frequency-scanned fan beam. Stacked antenna boards can produce a frequency-scanned pencil beam, or several independent frequency-scanned fan beams at different frequencies. The present antenna can operate in the microwave, millimeter-wave, terahertz, infrared, or optical frequency range. Because this frequency-scanned phased-array can be mass produced by planar fabrication techniques, it can be much smaller and less expensive than conventional "hollow pipe" waveguide frequency-scanned phased-array antennas.
REFERENCES:
patent: 3434139 (1969-03-01), Algeo
patent: 5227808 (1993-07-01), Davis
patent: 5519408 (1996-05-01), Schnetzer
patent: 5557291 (1996-09-01), Chu et al.
"Frequency Scanning Microstrip Antennas", by Magnus Danielsen and Rolf Jonsen, in IEEE Transactions on Antennas and Propagation, vol. AP-27, No. 2, Mar. 1979, pp. 146-150.
"Microwave Scanning Antennas", by R.C. Hansen, vol. 3, chapter two by N.A. Begovich, Academic press, 1966.
"Microwave Circuits and Antennas", by D.S. Sazonov, MIR Publishers, Moscow, 1990, pp. 22-29.
"Phased-Array Radars", by Eli Brookner, Scientific American, unspecified date, pp. 94-102.
DiDomenico Leo
Kinasewitz Robert T.
Le Hoang-anh
Moran John F.
Sachs Michael C.
The United States of America as represented by the Secretary of
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