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Publication numberUS3471860 A
Publication typeGrant
Publication dateOct 7, 1969
Filing dateSep 21, 1967
Priority dateSep 21, 1967
Publication numberUS 3471860 A, US 3471860A, US-A-3471860, US3471860 A, US3471860A
InventorsAmburgey Floyd D
Original AssigneeAmburgey Floyd D
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Variable shape reflector
US 3471860 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct. 7, 1969 F. D- AMBURGEY VARIABLE SHAPE REFLECTOR Filed Sept. 21, 1967 FIG. 4

FIG.3

INVENTOR. FLOYD D. AMBURGEY BY kgiw,

United States Patent 3,471,860 VARIABLE SHAPE REFLECTOR Floyd D. Amburgey, P.O. Box 1275, Sierra Vista, Ariz. 35635 Filed Sept. 21, 1967, Ser. No. 669,670 Int. Cl. H01q 15/20 US. Cl. 343--915 1 Claim ABSTRACT OF THE DISCLOSURE The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment to me of any royalty thereon.

This device provides a method of obtaining temporary or permanent surfaces of variable geometry for use as radiating, receiving and reflecting surfaces for electromagnetic waves.

The variable shape reflector antenna of this invention may be a laboratory, a field or a manufacturing tool. It also provides a means of varying the geometry of an electromagnetic receiving, radiating or reflecting surface (antenna reflector) such that the maximum gain or directivity can be obtained from any given signal over any given circuit. When used as a laboratory tool it provides empirical means of determining the most eflicient means of determining the most efiicient shape of a reflector. When employed in the field or for manufacturing, it provides a convenient and inexpensive means of engineering a. reflector for a given circuit.

The variable shape reflector antenna of this invention consists of three major parts; first, there is the reflector of flexible material with a highly reflective surface; second, there is the pressure or vacuum chamber behind the reflector; and third there is the pressure or vacuum pump connected to the chamber.

In the drawing:

FIGURE 1 is a perspective view of the front of the reflector antenna;

FIGURE 2 is a similar view of the back of the reflector of FIGURE 1;

FIGURE 3 is a diagrammatical side view of the antenna with the reflector in a convex shape extended to the limit of the flexible reflector material; and

FIGURE 4 is a view similar to FIGURE 3 with the dotted lines indicating the reflector in a concave shape indicating the opposite limit of the flexible reflector material.

Referring to the drawing, in which there is shown an air chamber which may be a pressure or a vacuum chamber having a port 11 and closed at the open end with a flexible reflector material 12 sealed on the periphery of the air chamber with a band 13. The flexible reflector 12 may be of any suitable material which in this example 3,471,869 Patented Oct. 7, 1969 is Saran wrap or foil. The port 11 is connected by a hose 14 to a pressure or vacuum pump (not shown) or as shown a rubber bulb 15 which will vary the pressure in the air chamber 10 to produce the various curvatures of the reflector 12.

In operation, the variable shape reflector is sealed to the rim of the air chamber which may be evacuated or pressurized for various shapes or curvatures of the flexible reflector. Thus the desired or the most favorable shape may be obtained by calculation or by testing until the strongest available signal is obtained if the reflector is connected in a circuit under test. Under certain conditions such as the use of the variable shape reflector in the laboratory or over certain circuits it is generally more advantageous to leave the reflector surface pliable so that the shape may be changed as desired or for future tests. However, having obtained the curvature for best reception the reflector may be fixed, as by spraying a fixing agent thereon or painting the reflector external surface with a compound, such as epoxy. With the reflector in a rigid shape, it may be removed, mounted in a frame and used as the actual reflector in a system or it can be used as a mold or pattern for the fabrication of additional re flectors utilizing that particular curvature.

While a circular reflector is illustrated and described, other shapes of reflectors may be employed, such as elliptical, rectangular or polygonal, as well as a combination of shapes where for example a circular reflector facing an elliptical reflector produces an image of another circular reflector.

In the foregoing, the preferred embodiment of this invention has been disclosed. However it is not intended that this invention be so limited to the specific illustration shown in the drawing. It will be apparent to those skilled in the art, that the shape of the reflectors as well as the curvature may be varied and a variety of equivalent reflector materials may be employed without departing from the spirit of the invention or exceeding the scope of the appended claim.

What is claimed is:

1. A method of regulating an antenna for improved reception comprising, utilizing for an antenna a flexible reflector backed by an air compartment, varying the curvature of the reflector within the limits of flexibility of the reflector material, regulating the degree of curvature of the antenna for best reception by the pressure in the air compartment behind the reflector, and spraying with a fixing agent the selected curvature of the reflector to impart permanency to the preferred shape.

References Cited UNITED STATES PATENTS 2,742,387 4/1956 Giuliani 343-912 2,948,896 8/1960 Hart 343-912 XR 2,952,189 9/1960 Pajes 350-295 3,001,196 9/1961 McIlroy et al. 343-915 3.273.157 9/1966 Kirstein 343--915 ELI LIEBERMAN Primarv Examiner M. NUSSBAUM. Assistant Examiner

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2742387 *Sep 28, 1953Apr 17, 1956Lavoie Lab IncReflector for electromagnetic radiations and method of making same
US2948896 *Sep 8, 1952Aug 9, 1960Gabriel CoWeatherproof antenna and reflector and method of making the same
US2952189 *Dec 15, 1955Sep 13, 1960Pajes Wolf SzmulCurved reflector
US3001196 *Jan 16, 1959Sep 19, 1961Gen Dynamics CorpDual pattern antenna
US3273157 *Feb 21, 1964Sep 13, 1966North American Aviation IncPneumatic control system for radar antenna
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4571594 *Sep 2, 1983Feb 18, 1986The United States Of America As Represented By The Secretary Of The Air ForceDirectional antenna system having sidelobe suppression
US4741609 *Dec 12, 1986May 3, 1988Sallis Daniel VStretched membrane heliostat with integral bladder
US5202689 *Aug 23, 1991Apr 13, 1993Apti, Inc.Lightweight focusing reflector for space
US6897832May 30, 2002May 24, 2005John R. Essig, Jr.Inflatable multi-function parabolic reflector apparatus and methods of manufacture
US7382332Dec 4, 2003Jun 3, 2008Essig Jr John RaymondModular inflatable multifunction field-deployable apparatus and methods of manufacture
Classifications
U.S. Classification343/915, 52/2.15
International ClassificationH01Q3/01, H01Q3/00, H01Q15/14
Cooperative ClassificationH01Q15/147, H01Q3/01
European ClassificationH01Q3/01, H01Q15/14D