Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Patent
1998-12-29
2000-07-11
Wong, Don
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
343799, 343838, 343890, 343912, 52111, H01Q 112
Patent
active
060880023
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a novel antenna system having increased capacity, easy assembly, fewer parts, high strength and the capability of enduring high wind-loads and low temperatures. This is accomplished by an antenna system comprising a closed ring of antenna panels supporting multiple lobes. The antenna system has a modular structure with exchangeable parts for economical transportation and manufacturing. The antenna system is easily adaptable to various conditions. The structural parts have an aerodynamic design and possible de-icing means for enduring severe climatic conditions.
The invention is related to the following patent applications with the same filing date as the present application or to be filed in the near future, having the same owner as the present application and entitled:
2. Discussion of the Background
The technological status of the analog cellular mobile telephony standard of today has a history going back to the late 70-ies. The present technology is a development of the systems from the early days.
The base stations are mostly omnidirectional sites (circular cells) or trisector sites (3.times.1200 cells). At the time of design it was considered to be enough with this cell structure. The antennas used are omnidirectional or 60.degree. sectorized antennas with low antenna gain requiring high power RF (Radio Frequency) transmitters in both the base station and in the mobile unit.
Existing cellular sites typically have 3 sides and each side has two receiving and two transmitting antennas spread out at a width of typically 3-6 meters, but each antenna and cell radio is only getting an effective use of 0.3.times.2.5 m with a width/height (W/H) ratio of 0.10-0.25. Thus only three different lobes and cells cover the horizon.
For a high capacity cellular antenna system it is much more important that the antenna has a wide diameter (=width) than it has height. Traditional cellular antennas typically are 0.3 m wide and 2.5-3.5 m high at 800/900 MHz or 0.7 m wide at 450 MHz and supports one 60.degree. lobe and a 120.degree. wide cell.
Thus, the prior art antenna systems typically have is high power consumption, high back lobes and high interference levels due to the reasons stated above.
SUMMARY OF THE INVENTION
The present invention proposes an antenna system having a ring antenna modular principle consisting of coupled grid panel reflector antennas having low back lobes, very high gain and capacity and low wind drag.
The invention and further developments of the invention are set out in detail in the accompanying claims.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
FIG. 1 is an overall view of a mast provided with a phased array antenna in accordance with the invention;
FIG. 2 is a cutaway view of a panel of the antenna and its mounting arrangement to the mast;
FIG. 3 is a perspective view of a panel of the phased array antenna in accordance with the invention;
FIG. 4 is a cutaway front view of a corner of the panel of FIG. 3
FIG. 5 is a cutaway rear view of a corner of the panel of FIG. 3;
FIG. 6 is a perspective view of a dipole element mounted on a transformer beam of the invention;
FIG. 7 is a view in longitudinal cross section of a dipole and a transformer beam of the invention;
FIG. 8 is a detail view of the lower connection between two panels;
FIG. 9 is a detail view of the lower connection between two panels similar to FIG. 8 but without the horizontal strut; and
FIG. 10 is a cross-sectional view of the oval horizontal strut.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, and more particularly to FIGS. 1-10 thereof, there
REFERENCES:
patent: 2577469 (1951-12-01), Kumpf
patent: 2954559 (1960-09-01), Yurek et al.
patent: 3836977 (1974-09-01), Wheeler
patent: 4405928 (1983-09-01), Elsbernd
patent: 5200759 (1993-04-01), McGinnis
patent: 5204688 (1993-04-01), Loiseau et al.
patent: 5418545 (1995-05-01), Pantsios et al.
Berglund Jan
Johnson Torbjorn
Phan Tho
Radio Design Innovation TJ AB
Wong Don
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