Broadband diamond-shaped antenna

• US 4,485,385 A
• Filed: 06/15/1982
• Issued: 11/27/1984
• Est. Priority Date: 06/15/1982
• Status: Expired due to Fees

• Current Assignee: General Signal Corporation (SPX Corporation)
• Original Assignee: RCA Corporation
• Inventors: Ralston, Margarete A.
• Primary Examiner(s): Lieberman, Eli
• Assistant Examiner(s): Ohralik, K.
• Application Number:
  US06/388,688
• Time in Patent Office: 896 Days
• Field of Search: 343/795, 343/794, 343/793, 343/809, 343/890, 343/797, 343/891
• US Class Current: 343/795
• CPC Class Codes: H01Q 19/10 using reflecting surfaces
• CPC Class Codes: H01Q 21/205 providing an omnidirectional coverage turnstile aerials H01Q21/26
• CPC Class Codes: H01Q 21/26 Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00

Abstract

A broadband antenna features a diamond-shaped radiator. The radiator can be bent to form a selected dihedral angle to achieve omnidirectivity when a plurality of antennas having reflector screens are used. Two pairs of radiators can be placed in the turnstile configuration. A pair of shorted tubes can be used as a combination feed means and balun to avoid a separate balun.

Claims

1. An antenna, comprising:

planar reflector means;

first and second straight elongated conductive support members spaced from and parallel to said planar reflector means, said first and second support members being mutually parallel;

support member shorting means coupled to said first and second support members for conductively coupling said first and second support members together at first and second locations along said support members;

first and second generally planar conductive dipole elements conductively coupled to and supported by said first and second support members, respectively, at a location centered between said shorting means, each of said first and second planar dipole elements being substantially parallel with said planar reflector means and extending perpendicularly from said support members by distances measured perpendicularly from said support members which are a maximum at a location half-way between said first and second shorting means and which distances are less at locations removed from said half-way location; and

feed means electrically coupled to said first and second support members at said location half-way between said first and second shorting means.

2. An antenna according to claim 1, wherein the spacing between said first and second shorting means is about 0.67 wavelengths at a selected design center frequency.

3. An antenna according to claim 2, wherein the spacing of the mutually facing surfaces of said first and second support members is about 0.031 wavelength at said selected design center frequency.

4. An antenna according to claim 1, wherein said first and second dipole elements have a dihedral angle of about 160°

therebetween.

5. An antenna according to claim 2, wherein said first and second dipole elements have a dihedral angle of about 160°

therebetween.

6. An antenna, comprising:

first and second elongated straight mutually parallel conductive support means lying in a first plane;

first and second conductive shorting means coupling said first and second support means together at first and second locations, respectively, which first and second locations are equidistant from a central transverse second plane which is transverse to the longitudinal direction of said elongated support means;

feed means coupled to said first and second support means at said transverse second plane; and

planar radiating means electrically coupled to and supported by said second support means, said planar radiating means lying in said first plane and extending away from said first and second support means, said planar radiating means extending from said second support means by distances measured perpendicularly from said second support means, which distances differ from location to location along the length of said support means, said distances being a maximum at the location of said transverse second plane and being less than said maximum and decreasing linearly from said maximum distance at locations along the length of said support means removed from said transverse second plane.

7. An antenna according to claim 6 wherein said first and second elongated mutually parallel conductive support means comprise equal-diameter tubes.

8. An antenna according to claim 7 further comprising a second planar radiating means electrically coupled to and supported by said first support means, said second planar radiating means being substantially coplanar with said first-mentioned radiating means, said antenna further having a plane of symmetry lying between said first and second elongated mutually parallel conductive support means.