Antenna system

• US 5,999,145 A
• Filed: 06/26/1998
• Issued: 12/07/1999
• Est. Priority Date: 06/26/1998
• Status: Expired due to Term

• Current Assignee: SPX Corporation
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Niekamp, Rex Leonard
• Primary Examiner(s): Le, Hoanganh
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US09/105,829
• Time in Patent Office: 529 Days
• Field of Search: 343/890, 343/878, 343/892, 343/800, 343/795, 343/767
• US Class Current: 343/890
• CPC Class Codes: H01Q 1/1242 Rigid masts specially adapted for supporting an aerial
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/061 Two dimensional planar arrays
• CPC Class Codes: H01Q 21/062 using dipole aerials; H01Q21/067, H01Q21/068 take precedence
• CPC Class Codes: H01Q 21/20 the units being spaced along or adjacent to a curvilinear path slotted waveguide arrays H01Q21/005; circularly or helically slotted waveguides H01Q21/0062
• CPC Class Codes: H01Q 21/205 providing an omnidirectional coverage turnstile aerials H01Q21/26
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 21/293 one unit or more being an array of identical aerial elements adaptive arrays H01Q3/2605

Abstract

An antenna system is presented herein for radiating RF energy. This system includes a vertical mast having N vertically oriented faces which surround a vertically extending mast and wherein N is equal to at least 3. A plurality of vertically spaced antenna bays is provided with each bay having an array of N antennas carried by the mast. Each antenna includes radiating means located substantially in a plane parallel to one of the N faces. Each face is oriented at a given angle ##EQU1## from an adjacent face. The mast has N corners, each corner being located intermediate a pair of faces. N fins are provided with each fin being associated with one of the corners and extending radially outward of the axis beyond the associated corner.

Claims

1. An antenna system for use in radiating RF energy and comprising:

a vertical mast having N vertically oriented faces surrounding a vertically extending axis, and wherein N is at least 3;

a plurality of vertically spaced antenna bays, each bay having an array of N antennas carried by said mast, with each antenna including radiating means located substantially in a plane parallel to one of said N faces, each said face being oriented at a given angle of ##EQU3## from an adjacent said face;

said mast having N corners, each said corner being located intermediate a pair of adjacent said faces; and

,

N fins, each associated with one of said corners, each said fin extending radially outward of said axis beyond the associated said corner.

2. An antenna system as set forth in claim 1 wherein each said face has a radially extending flange and means for securing said flange to one of said fins.

3. An antenna system as set forth in claim 2 wherein the radially extending flanges of adjacent faces extend radially outward of said mast and are spaced from each other on opposite sides of a said radially extending fin.

4. An antenna system as set forth in claim 3 wherein each said fin has a distal end, a cylindrical radome coaxially encircles said mast, and means for securing the distal end of each said fin to said radome.

5. An antenna system as set forth in claim 4 wherein said means for said securing includes a mounting plate secured to the distal end of each said fin and means for fastening said mounting plate to said radome.

6. An antenna system as set forth in claim 3 wherein each said fin has an proximal end spaced radially inward toward said axis away from said distal end and extending inwardly of a said corner.

7. An antenna system as set forth in claim 6 including vertically extending support means located within said mast, said support means being secured to the proximal ends of said fins.

8. An antenna system as set forth in claim 7 wherein said support means includes a vertically extending centrally located hollow tube which surrounds said axis.

9. An antenna system as set forth in claim 8 wherein said tube is a cylindrical tube which coaxially surrounds said axis.

10. An antenna system as set forth in claim 7 wherein said support means includes N vertically extending corner support members each located within said mast at one of the corners therein, each said support member being secured to a selected one of said N fins.

11. An antenna system as set forth in claim 10 wherein each said corner support member is V shaped in cross section.

12. A television antenna bay composing:

at least three panel antennas, each including radiating elements secured to a back reflector arranged about an antenna bay axis to provide an omnidirectional radiation pattern for television signals;

a signal feed arrangement coupled to the panel antennas for applying television signals thereto;

a plurality of a combined support member and fin arrangements, each of the support members extending vertically within the antenna bay and coextensive therewith with the fins extending radially outward from the antenna bay between separate panel antennas, and

means for securing the back reflectors of the panel antenna to the support member and fin arrangements provide support for the panel antennas within the antenna bay.

13. A television antenna bay as set forth in claim 12 wherein:

the signal feed arrangement includes a rigid tube extending within the antenna bay that carries the signal coaxial cables within the tube, and

the support member and fin arrangements extend inwardly within the antenna bay and attach to the rigid tube.

14. A television antenna bay as set forth in claim 12 wherein:

the thickness of the fins and the extent to which the fins extend beyond the panel antenna is selected to enhance the omnidirectional pattern circularity.

15. A television antenna bay as set forth in claim 12 wherein:

the back reflectors have a generally rectangular shape with the ends thereof bent outwardly to form a shallow cavity for the reflective element, and

the securing means secures the bent edges to the fins.

16. A television antenna bay as sot forth in claim 15 including:

a radome surrounding all of the antenna panels, and

the end of each fin extending from the support means is secured to the radome.

17. A television antenna section comprising:

a plurality of vertically stacked antenna bays;

at least three panel antennas included in each bay, each panel antenna including a radiating element secured to a back reflector and arranged about the vertical antenna bay axis to provide an omnidirectional radiation pattern for television signals;

a signal feed arrangement coupled to each of the panel antennas in each antenna bay for applying separate television signals to each antenna bay;

a plurality of a combined support member and fin arrangements, each of the support members extending vertically within the antenna bays and coextensive with the antenna section with the fins extending radially outward from the antenna bay between separate panel antennas, and

means for securing the back reflectors of the panel antennas to the support member and fin arrangements provide support for the panel antennas within the antenna section.

18. A television antenna section as set forth in claim 17 wherein:

the signal feed arrangement includes a rigid tube arrangement extending within the antenna bays and coextensive with the antenna section that carries the signal coaxial cables within the tube arrangement, and

the support member and fin arrangements extend inwardly within the antenna bays and attach to the rigid tube.

19. A television antenna section as set forth in claim 17 wherein:

the thickness of the fins and the extent to which the fins extend beyond the panel antenna is selected to enhance the omnidirectional pattern circularity.

20. A television antenna section as set forth in claim 19 wherein:

the back reflectors have a generally rectangular shape with the ends thereof bent outwardly to form a shallow cavity for the reflective element, and

the securing means secures the bent edges to the fins.

21. A television antenna section as set form in claim 20:

including a radome surrounding all of the antenna panels, and

wherein the ends of the fins extending from the support means are secured to the radome.

22. A television antenna section as set forth in claim 17 wherein:

the antenna section is adapted to be connected to another antenna section to provide a multiple section vertical antenna structure whereby the support members in both antenna sections provide support for the combined multiple section antenna structure.

23. In a television antenna bay including at least three panel antennas, each including radiating elements secured to a back reflector and arranged about an antenna bay axis to provide an omnidirectional radiation pattern for television signals, a signal feed arrangement coupled to the panel antennas for applying television signals thereto, a plurality of support members with each of the support members extending vertically within the antenna bay and coextensive therewith, a method of providing added support for the antenna bay as well as improving the omnidirectional pattern circularity comprising the steps of:

connecting a fin to each of the support members so as to extend outward from the antenna bay between separate panel antennas so as to provide a combined support member and fin arrangement to provide added structural strength for supporting the panel antennas in the antenna bay,

securing the back reflectors of the panel antenna to the combined support member and fin arrangement, and

selecting the thickness of the fins and the extent to which the fins extend from the support member so as to improve the omnidirectional pattern circularity on the antenna bay.

24. A method as defined in claim 23 including:

providing a rigid tube within the antenna bay and coextensive with the antenna bay to carry coaxial signal cables within the tube for the signal feed arrangement,

extending the support member and fin arrangements inwardly within the antenna bay, and

attaching the support and fin arrangement to the rigid tube.

25. In a television antenna section including a plurality of vertically stacked antenna bays, at least three panel antennas included in each bay, each panel antenna including a radiating element secured to a back reflector and arranged about the vertical antenna bay axis to provide an omnidirectional radiation pattern for television signals, a signal feed arrangement coupled to each of the panel antennas in each antenna bay for applying separate television signals to each antenna bay, a plurality of support members extending vertically within the antenna bays and coextensive with the antenna section a method of providing added support for the antenna bays within the antenna section as well as improving the omnidirectional pattern circularity comprising the steps of:

connecting a fin to each of the support members so as to extend outward between separate panel antennas so as to provide a combined support member and fin arrangement to provide added structural strength to the support the panel antennas in the antenna section;

securing the back reflectors of the panel antennas to the combined support member and fin arrangement to provide support for the panel antennas within the antenna section and,

selecting the thickness of the fins and the extent to which the fins extend from the support member so as to improve the omnidirectional pattern circularity on the antenna bay.

26. A method as defined in claim 25 including:

providing a rigid tube arrangement extending within the antenna bays and coextensive with the antenna section to carry coaxial signal cables within the tube for the signal feed arrangement,

extending the support member and fin arrangements inwardly within the antenna bay, and

attaching the support and fin arrangement to the rigid tube.