Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1995-01-09
1996-04-30
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343792, 343830, H04Q 2100
Patent
active
055129145
ABSTRACT:
An omni-directional, collinear, vertical base station antenna having an adjustable or variable radiation beam tilt capability. Terminations at the drive or feed points are provided by an adjustable, capacitive coupling structure at the feed points between the conductive elements of a feed structure and a radiator assembly for adjusting the physical position of the feed points and thereby the phase of the feed points relative to the upper and lower portions of the antenna to alter the deflection angle of the radiation produced. A signal feed, having first and second conductive feed elements, is connectable to a signal feed line to couple a signal between the feed line and the radiator assembly. An adjustable support and control mechanism supports said elongated radiator assembly and said signal feed for relative movement therebetween to effect selective adjustment of the feed points of said capacitive coupling structure along the length of said elongated di-pole radiator assembly to thereby effect adjustment of the beam angle of the radiation pattern.
REFERENCES:
patent: 2486597 (1949-11-01), Greene
patent: 3623113 (1971-11-01), Faigen et al.
patent: 3750181 (1973-07-01), Kuecken
patent: 4460896 (1984-07-01), Shmitka
patent: 4907008 (1990-03-01), Dienes
Vehicular Technology Society 42nd VTS Conference Frontiers of Technology; Electrical Downtilt Through Beam-Steering Versus Mechanical Downtilt; Gary Wilson; Feb. 1992 pp. 1-4.
Proceedings of the National Communications Forum; Antenna Pattern Considerations in Optimizing Cellular RF Designs; Michael E. Maragoudakis; Sep. 30-Oct. 2, 1991 pp. 624-630.
International Symposium; Low Sidelobe and Tilted Beam Base-Station Antennas for Smaller Cell Systems; Yamada and Kijima; IEEE Catalog No. CH 2654-Feb. 1989; Jun 26-Jun. 30, 1989 pp. 1-4.
Hadzoglou James
Stevens Harold E.
Warner Michael E.
Hajec Donald T.
Ho Tan
Orion Industries, Inc.
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