Broad band antenna

• US 6,909,403 B2
• Filed: 10/16/2003
• Issued: 06/21/2005
• Est. Priority Date: 10/17/2002
• Status: Active Grant

• Current Assignee: RF Industries Pty Limited
• Original Assignee: RF Industries Pty Limited
• Inventors: Wang, Daniel, Daly, Robert, Jaques, Steve
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US10/687,335
• Publication Number:
  US 20050001783A1
• Time in Patent Office: 614 Days
• Field of Search: 343/702, 343/700.MS, 343/872, 343/895, 343/722, 343/795
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/40 Radiating elements coated with or embedded in protective material
• 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
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A collinear antenna segment is provided with a plurality of radiating elements and inter-element phasing sections arranged alternately on a singlesided elongated substrate. The segment has an operatively curved in-use configuration about a longitudinal axis running substantially along the length of the segment. In use, the inter-element phasing sections allow the radiating elements to radiate electromagnetic radiation substantially in phase over an intended range of frequencies. The segment may be arranged on a flexible substrate which can be operatively curved for insertion into a radome. Alternatively, the segment may be directly arranged on the curved inner surface of a radome.

Claims

1. A series collinear antenna segment, including a plurality of radiating elements and inter-element phasing sections arranged alternately on a single sided elongated substrate, wherein said segment is adapted to be operatively curved in an at use configuration about a longitudinal axis running substantially along the length of said segment, and wherein said inter-element phasing sections are operatively adapted to allow said radiating elements to radiate electromagnetic radiation substantially in phase over an intended range of frequencies.

2. A series collinear antenna segment as claimed in claim 1, wherein said substrate is flexible.

3. A series collinear antenna segment as claimed in claim 1, wherein said substrate includes an adhesive for affixing said substrate to a surface.

4. A series collinear antenna segment as claimed in claim 1, wherein said substrate is a radome and said segment is arranged on an inner surface of said radome.

5. A series collinear antenna segment as claimed in claim 1 wherein said inter-element phasing section is arranged offset laterally and to one side of a longitudinal axis running substantially along the centre of said substrate such that said radiating elements and said inter-element phasing sections are operatively facing substantially perpendicular to each other.

6. A series collinear antenna segment as claimed in claim 2 wherein said inter-element phasing section is arranged offset laterally and to one side of a longitudinal axis running substantially along the centre of said substrate such that the angle between a tangent to the curved radiating element at the element centre and said inter-element phasing section can be adjusted by varying the degree of curvature of the flexible substrate in order to adjust the degree of coupling between the inter-element phasing section and the radiating element from a minimum of 90 degrees to a larger value at less than 90 degrees.

7. A series collinear antenna segment as claimed in claim 1 wherein said inter-element phasing section includes a conductive track, said conductive track arranged to follow a serpentine path.

8. An end fed series collinear antenna incorporating at least one series collinear antenna segment as claimed in claim 1.

9. A centre-fed collinear antenna incorporating at least one series collinear antenna segment as claimed in claim 1.