Communications: radio wave antennas – Antennas – Slot type
Reexamination Certificate
1999-05-12
2001-09-04
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
Slot type
C343S771000, C343S772000
Reexamination Certificate
active
06285335
ABSTRACT:
This application claims priority under 35 U.S.C. §§119 and/or 365 to 9801667-8 filed in Sweden on May 12, 1998; the entire content of which is hereby incorporated by reference.
BACKGROUND
This invention relates to a method of manufacturing an antenna structure for the transmission and processing of electromagnetic microwave signals.
This invention also relates to an antenna structure comprising a distribution network for the transmission and processing of electromagnetic microwave signals. The antenna structure is constructed as a plate structure, in which there are cut-outs and which comprises at least one intermediate electrically-conductive plate with surrounding electrically-conductive plates attached on each side of each intermediate plate. Each side of these surrounding plates is in contact with one or the other side of each intermediate plate.
The most commonly used antenna structure for microwave signals is the reflector antenna with a three-dimensionally curved reflector, normally in the shape of a parabola, with a feeder situated at the focus. However, this type of antenna takes up a lot of room, particularly on account of its large depth in relation to its height.
Within wireless information transmission, e.g. within radio link communication, ever-increasing demands are being made for thin plate structures, which are able to fit more easily into the surroundings.
Previously flat conductor antenna have been produced based upon microstrip technology which, although it is flat, involves large losses and can lead to complicated solutions, particularly for high frequencies.
U.S. Pat. No. 3,925,883 shows a wave guide device which is formed by bending a metal plate and fixing it to other plates. A component of the wave guide device can be constructed of a plate structure with a number of plates with holes laid on each other which form a microwave flange. The holes in the plates have, however, relatively similar configuration whereby a hole in an intermediate plate is not limited to any significant degree by the surrounding plates, which thereby cannot form any wave guide structure in the principal plane of the plates. The wave conductor device is not an antenna structure.
A wave guide device which is constructed as a plate structure is known from SWEDISH PATENT DOCUMENT SE-C2-505 504. This device has a base plate in which wave conductors and wave conductor components are cut out. In this device only one surrounding plate forms the limit surface for one and the same hole. Nor does this wave guide device consist of an antenna structure.
SUMMARY
The aim of this invention is to produce an antenna structure using a simple construction technique, even in those cases where a complicated structure is to be produced.
This aim is achieved by means of a method and an antenna structure according to this invention. The method comprises making holes in at least three electrically-conductive plates by a mechanical or chemical process in order to create cut-outs in the form of through holes with electrically-conductive edge surfaces. These have a defined position and length on each plate's principal plane and also a length from one side of each plate to its other side. The method also comprises stacking the plates with the holes in a defined relative position and electrically-conductive fixing together of the sides of the plates to each other at least around the edge surfaces formed. In this way a number of holes are given electrically-conductive limit surfaces in the form of the edge surfaces and also the parts of the side surfaces of the surrounding plates facing the holes. The cut-outs in the antenna structure are made up of through holes with electrically-conductive edge surfaces which form first limit surfaces in each hole. These extend in the principal plane of each plate with a defined position and length for each plate and extend from one side of each plate to its other side. At least two of the surrounding plates form with parts of their side surfaces facing the holes in an intermediate plate second limit surfaces for the said holes in at least one intermediate plate.
Complicated structures can also be manufactured by the method and the antenna structure according to the invention with an extremely rational, cost-saving manufacturing technique whereby each plate is provided with through holes and certain surrounding plate surfaces form limit surfaces for the intermediate plate or plates.
REFERENCES:
patent: 3914861 (1975-10-01), Phillips
patent: 3925883 (1975-12-01), Cavalear
patent: 5426442 (1995-06-01), Haas
patent: 5541612 (1996-07-01), Josefsson
patent: 5568160 (1996-10-01), Collins
Johansson Sune
Snygg Goran
Svensson Bengt
Burns Doane Swecker & Mathis L.L.P.
Le Hoang-anh
Telefonaktiebolaget LM Ericsson
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