Method of manufacturing linear-circular polarizer

• US 5,937,509 A
• Filed: 04/23/1997
• Issued: 08/17/1999
• Est. Priority Date: 09/12/1994
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yoshimura, Yoshikazu, Nagatsu, Tatsuya, Tokuda, Katsuhiko
• Primary Examiner(s): Arbes, Carl J.
• Application Number:
  US08/844,983
• Time in Patent Office: 846 Days
• Field of Search: 29/600, 29/601, 29/602.1, 333/21 A, 333/157
• US Class Current: 29/600
• CPC Class Codes: H01P 1/173 using a conductive element
• CPC Class Codes: H01P 11/00 Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
• CPC Class Codes: H01Q 1/247 with frequency mixer, e.g. for direct satellite reception or Doppler radar
• CPC Class Codes: H01Q 13/0208 Corrugated horns waveguide mouth antenna with corrugated flange H01Q13/065; manufacturing details H01Q13/0283
• CPC Class Codes: H01Q 15/244 converting a linear polarised wave into a circular polarised wave guided wave H01P1/17
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A linear-circular polarizer used for the transmission in the microwave band, which provides excellent impedance characteristics and stabilized cross polarization characteristics by having 1/4 wavelength phase plates and the inner surface of a circular waveguide made in one-piece for the purpose of cost and production step reduction. The linear-circular polarizer includes a pair of 1/4 wavelength phase plates of a specified width and height formed opposite to each other and symmetric with respect to the waveguides central axis. The 1/4 wavelength phase plates are formed on the inner surface of a circular waveguide at a closed end opposite to an end where a primary radiator is located.

Claims

1. A method of manufacturing a linear-circular polarizer comprising:

the step of molding at least 1/4 wavelength phase plates together with a waveguide in one-piece.

2. A method of manufacturing a linear-circular polarizer comprising:

the step of molding at least 1/4 wavelength phase plates and a separator together with a waveguide in one-piece.