Communications: radio wave antennas – Antennas – Slot type
Patent
1993-09-15
1995-06-20
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Slot type
H01Q 1310
Patent
active
054264413
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
This invention relates to radio engineering, microwave technology antenna-feeder devices, and, more specifically, to a planar slot antenna grid.
PRIOR ART
Work is currently under way on creating antennas of microwave design which would be compatible with modern radio-electronic equipment and ensure an efficiency factor above 0.7 at apertures lying within 15 to 30 wave lengths in free space, and at a working frequencies range of not less than 10%. Apart from that, these antennas should be simple in construction and have small mass/weight and thickness. They should have high manufacturabilty and replication or recurrence of dimensions or parameters.
Attempts to make antennas with said characteristics have materialized in the creation of a slot antenna grid of a printed circuit design ("Radio-Electronics Abroad", Summary, Publication 7(39), 1989 [SRIER, Moscow, "Planar Antennas for Direct TV Broadcasting Systems", pp. 3, 4, FIG. 1]). This slot antenna grid contains a dielectric substrate with wide slot-windows communicating with a waveguide-feeder network formed by strip-lines.
Since the slot antenna grid is obtained in its printed circuit design, it is adaptable to streamlined manufacture, is simple in construction, has small mass/weight and thickness, and high replication of dimensions and parameters.
However, the antenna grid exhibits comparatively big losses in the waveguide-feed network, and both at an aperture size lying within 15 to 30 wave lengths in free space and at working frequencies range of not less than 10%, its efficiency factor does not exceed 0.6. This is conditioned by the fact that the waveguide-feeder network of this antenna grid is produced on strip-lines exhibiting losses within the range of 0.05 to 0.1 d.b./cm.
Known in the prior art also is a waveguide-slot antenna grid on hollow or cored waveguides (D. I. Voskresenski et al. "Antennas & Microwave Devices.Designing Phased Antenna Grids", 1981, Radio and Communication, Moscow, pp. 126-128). In this antenna grid, waveguide-slot radiators and waveguide-feeder network are obtained on hollow metallic waveguides.
Under the above conditions, the slot antenna grid of this kind provides a high efficiency factor which is due to the fact that the losses in the waveguide-slot radiators and the waveguides of the waveguide-feeder network are minimal and do not exceed 0.001 d.g./cm.
Such construction of the antenna grid is, however, not easily manufacturable because its manufacturing involves a lot of unprogresive mechanical assemblage which does not provide required replication of dimensions and parameters of the antenna grid. Apart from that, the employment of hollow metallic waveguides results in that this antenna grid has large mass/weight and thickness, and a high level of metal consumption.
Known in the prior art is also a slot antenna grid ("Radio-Electronics Abroad", Summary, Publication 2(34), 1989, [SRIER, "Planar Waveguide-Slot Antenna Grids", pp. 24-26, FIG. 2]), containing a number of waveguide-slot antenna radiators having wide reverse and outer side faces in which there are obtained, respectively, exciting slots of coupling and radiating slots. The faces lie correspondingly in two parallel planes, and a waveguide-feeder network containing waveguide distributors of power and feeding waveguides is also obtained channels of which are communicating with the exciting slots of coupling.
Every waveguide-slot radiator is formed as a result of plate assembly manufactured from a metal sheet with radiating slots obtained in it. The plate representing a wide outer side face of this radiator has a base in which, under the waveguide of each waveguide-slot radiator, a rectangular groove is obtained with formation of two narrow side faces and one wide reverse side face of this waveguide-slot radiator. The waveguide-feeder network is made on hollow metallic waveguides.
Under above conditions, such a planar slot antenna grid demonstrates high efficiency factor owing to the fact that the losses in the waveguides of the waveguide-s
REFERENCES:
patent: 4243990 (1981-01-01), Nemit et al.
patent: 4851855 (1989-07-01), Tsukamoto et al.
Microwave Radio Engineering Express Information Nos. 32 and 25, 1989.
Baev Vladimir S.
Kapitsyn Alexandr P.
Khudysh Alexandr I.
Aktsionernoe Obschestvo Otkrytogo Tipa Zavod "Krasnoe Znamy"
Wimer Michael C.
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