Wide relative frequency band and reduced size-to-wavelength ratio antenna

• US 3,987,456 A
• Filed: 07/21/1975
• Issued: 10/19/1976
• Est. Priority Date: 08/01/1974
• Status: Expired due to Term

• Current Assignee: Societe Lignes Telegraphiques et Telephoniques
• Original Assignee: Societe Lignes Telegraphiques et Telephoniques
• Inventors: Gelin, Jean
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Chin, Tommy P.
• Application Number:
  US05/597,679
• Time in Patent Office: 456 Days
• Field of Search: 343/795, 343/797, 343/799, 343/804, 343/845, 343/846, 343/773, 343/790, 343/791, 343/774, 343/703, 343/861, 343/775, 343/830, 343/831
• US Class Current: 343/830
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 13/206 Microstrip transmission line antennas
• 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 wide relative frequency band and reduced size-to-wavelength ratio antenna comprising essentially a first part in the form of a conductor ring and a second part in the form of a skirt respectively connected to the central and outer conductors of a coaxial feeder. The first part has a conductive path in the form of a circumference and one of its diameters; the central conductor of the feeder is connected to the mid-point of the said diameter. The second part is in the form of a skirt and has a conductive path formed by a circular ring connected to one of the ends of each one of a plurality of conducting strands having the form of broken lines inscribed in isosceles trapezoid forming an assembly defining the faces of a frusto-pyramid, while an annular and conical end member is connected to the feeder outer conductor and is in contact with the other ends of the strands.

Claims

1. A wide relative frequency band and reduced size-to-wavelength ratio antenna comprising

a coaxial feeder,

a first conducting part in the form of a ring and a second conducting part in the form of a frusto-pyramidal skirt respectively connected to the central and outer conductors of said coaxial feeder, in which said first conducting part includes a conductive path in the form of a circumference and one of its diameters, said central conductor of said feeder to said conducting path being connected to said path at the center of the one of said diameters, in which said second conducting part includes a further conductive path including conducting strands, said further conducting path having the form of a circumference and connected to one of the ends of each one of said conducting strands, and the edges of said conducting strands being respectively inscribed in each one of a plurality of isosceles trapezoids constituting the side faces of said frusto-pyramid;

and an annular and conical end member which is connected to said feeder outer conductor and to the other end of said each one of said strands, the assembly of which forms said skirt.

2. An antenna according to claim 1, in which said conductive paths are made of metal wires embedded in a dielectric material.

3. An antenna according to claim 1, in which at least part of said conductive paths are made of printed-circuit conductors.

4. An antenna according to claim 1, in which said frusto-pyramidal skirt has six side faces.

5. An antenna according to claim 1, the conical end member of which has an apex angle close to and greater than that of said frusto-pyramid.

6. An antenna according to claim 1, in which said further conductive path in the form of a circumference is circumscribed on the polygon formed by the base sides of said trapezoid.

7. An antenna according to claim 1, in which said further conductive path in the form of a circumference is inscribed in the polygon formed by the base sides of said trapezoid.

8. An antenna according to claim 1, in which said frusto-pyramid has an apex angle substantially equal to 60°

and in which said annular conical end member has an apex angle substantially equal to 80°

.

9. An antenna according to claim 1, in which said frusto-pyramid has an apex angle substantially equal to 60°

and in which said annular conical end member has an apex angle substantially equal to 90°

.