HELICAL LAUNCHER

• US 3,569,979 A
• Filed: 12/05/1968
• Issued: 03/09/1971
• Est. Priority Date: 12/05/1968
• Status: Expired due to Term

• Current Assignee: Edward K. Damon, Leon Peters Jr, Munk Benedikt Aa
• Original Assignee: Edward K. Damon, Leon Peters Jr, Munk Benedikt Aa
• Inventors: MUNK BENEDIKT AA, Peters, Leon Jr., Damon, Edward K.
• Application Number:
  US04/781,319
• Time in Patent Office: 824 Days
• US Class Current: 343/895
• CPC Class Codes: H01Q 11/08 Helical antennas

Abstract

The invention is for a helical antenna assembly which utilizes a coaxial cable as a means of electrical excitation and provides a gradual transition from the coaxial cable to the helix wire to permit higher power excitation and elimination of a flat ground plane.

Claims

1. A helical antenna including a coaxial cable as the means of electrical excitation of said antenna'"'"''"'"'s helix, the improvement comprising said helix fixedly attached to the inner conductor of said coaxial cable, said coaxial cable having removed a predetermined length of the metal in said coaxial cable'"'"''"'"'s outer conductor at the end of said cable coincident with said attachment of said helix, and said inner conductor having said predetermined length of said outer conductor of said coaxial cable removed therefrom formed into a helical shape conforming to that of said antenna'"'"''"'"'s helix.

2. A helical antenna as set forth in claim 1 wherein said metal is removed in a tapered configuration from said outer conductor.

3. A helical antenna as set forth in claim 1 wherein said metal is linearly removed from said outer conductor.

4. A helical antenna as set forth in claim 1 wherein said metal is exponentially removed from said outer conductor.

5. A helical antenna as set forth in claim 1 wherein said outer conductor of said coaxial cable is tapered over a length of approximately one-half the wavelength of the operating frequency in that portion of said conductor which is internal to said antenna'"'"''"'"'s helix.

6. A helical antenna as set forth in claim 1 wherein said outer conductor of said coaxial cable is tapered over a length of approximately 1 1/2 the wavelength of the operating frequency in that portion of said conductor which is external to said antenna'"'"''"'"'s helix.