Airborne antenna platform

• US 4,797,680 A
• Filed: 09/16/1985
• Issued: 01/10/1989
• Est. Priority Date: 09/16/1985
• Status: Expired due to Fees

• Current Assignee: Union Carbide Coatings Service Corporation
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Smethers, Rollo G. Jr.
• Primary Examiner(s): Blum, Theodore M.
• Assistant Examiner(s): Issing, Gregory C.
• Application Number:
  US06/776,264
• Time in Patent Office: 1,212 Days
• Field of Search: 343/705-708, 343/718, 343/741, 343/757, 343/866, 343/872, 343/887, 343/892
• US Class Current: 343/705
• CPC Class Codes: H01Q 1/28 Adaptation for use in or on aircraft, missiles, satellites, or balloons

Abstract

An airborne antenna platform is disclosed capable of providing near-continuous spherical coverage of the volume surrounding the airborne platform.

Claims

1. An airborne antenna platform comprising:

(a) an aircraft having wing structural elements for the attachment of external equipment;

(b) an antenna housing having a substantially circular configuration and a substantially elliptical cross-section, said antenna housing cross-section having a major axis L and a minor axis D, the ratio of L to D being on the order of about 2.6 to 1;

(c) a plurality of attachment members for flexibly affixing said antenna housing to said aircraft, said attachment members comprising;

(1) a pair of fasteners having a predetermined length such that the distance of the antenna housing beneath the wing of said aircraft minimizes the possibility that said housing will contact the ground during takeoff or landing, each of said fasteners being adapted for pivotal attachment to said wing structural elements and to said housing, said fasteners having at least a load bearing support;

(2) strut extensions for attaching said antenna housing to the nose of said aircraft; and

(3) fastener means for fastening said antenna housing to the afterbody of the fuselage of said aircraft; and

(d) an antenna, housed within said antenna housing, for transmitting and receiving electromagnetic energy.

2. An airborne antenna platform according to claim 1, wherein the outward facing portion of said antenna housing is constructed from a material which is essentially transparent to electromagnetic energy.

3. An airborne antenna platform according to claim 2, wherein the inward facing portion of said antenna housing is constructed from a material having a high strength to weight ratio.

4. An airborne antenna platform according to claim 3, wherein said antenna comprises

(a) an array of dipole stations, each station comprising at least one dipole for transmitting and receiving electromagnetic energy;

and

(b) a dipole ground plane extending the circumferential length of the interior of said antenna housing, and having an outward facing electromagnetic energy reflector, each of said dipoles being affixed to said dipole ground plane.

5. An airborne antenna platform according to claim 4, wherein:

(a) each of said dipoles is spaced approximately 3/8 of a wavelength of the wavelength of the electromagnetic energy transmitted by said antenna; and

(b) each dipole station is spaced approximately 1/2 of a wavelength of the wavelength of the electromagnetic energy transmitted by said antenna.

6. An airborne antenna platform according to claim 5, wherein each dipole station comprises:

(a) a plurality of vertically aligned dipoles; and

(b) two sets of horizontally aligned dipole pairs, one pair being positioned above said vertically aligned dipoles and one set positioned beneath.

7. An airborne antenna platform according to claim 6, wherein each dipole has a transmitter/receiver module for transmitting and receiving electromagnetic energy.

8. An airborne antenna platform according to claim 7, wherein said antenna is an electromagnetically steerable phased array antenna.