Wide-banded base station antenna

Details Wide-banded base station antenna Wide-banded base station antenna

1996-01-11

1997-03-18

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343791, 343749, H01Q 904

Patent

active

056127057

ABSTRACT:
A base station antenna includes a matching network that broadbands transmission without requiring adjustment. Using a one-quarter wavelength (1/4 .lambda.) or less sperrtopf sleeve in a coaxial arrangement, broadbanding is achieved by adding a second conductor parallel to the transmission line center conductor. A ring inductor is tapped at one end off-center by the second conductor. The inductor's step-up end is connected to the antenna with the primary end connected to the transmission line center conductor. Mutual inductance may be present, but is not required, between the transmission line center and second conductors. Fringing capacitance between the antenna and the sleeve establishes an "L" network in conjunction with the inductor. To protect the inductor from the elements, it is placed inside the antenna near the sleeve.

REFERENCES:
patent: 2296356 (1941-07-01), Lindenblad
patent: 3315264 (1967-04-01), Brueckmann
patent: 4835539 (1989-05-01), Paschen
patent: 4968991 (1990-11-01), Yamazaki
Maxrad's catalog specification sheets for Ringo and MBS/MBX antennas. (Date is not available).
M. Taguchi et al.; "Sleeve Antenna with Ground Wires," IEEE Transactions on Antennas and Propagation; vol. 39, No. 1, Jan. 1991; pp. 1-7.
Antennas Engineering Handbook, excerpted pp. 43-27 to 43-31 (Date is not available).

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