Apparatus and method for matching radiator and feedline impedances and for isolating the radiator from the feedline United States Patent 04940989

04940989 is referenced by 26 patents and cites 2 patents.

A method of feeding a high impedance point of an antenna, such as the end of a 1/2 wave radiator. A resonant cavity is used for making an impedance match between the antenna and the feed line and forming a decoupling mechanism for forming the high impedance. Simultaneously, the cavity choke is formed with the open end facing toward the feed point for allowing a feed point impedance transformation between the feed line and the high impedance at the end of the 1/2 wave element and forming a high impedance point by its resonance for preventing the feed from flowing down along the outer surface of the choke and feed line.

Title
Apparatus and method for matching radiator and feedline impedances and for isolating the radiator from the feedline
Application Number
856236
Publication Number
4940989
Application Date
December 12, 1988
Publication Date
July 10, 1990
Inventor
Richard A Austin
Powder House Rd., R.D. #1, Sandown, 03873
NH, US
Agent
Ross Ross & Flavin
IPC
H01Q 9/40
View Original Source

Citations: 26 (view full list)

  1. Mitsuya Makino: Antenna used for a plurality of frequencies in common. Nippon Antenna, Flynn Thiel Boutell & Tanis, September 28, 1993: US05248988 (71 worldwide citation)
  2. Dean Kitchener, Ronald Harvey Johnston: Multi-resonant antenna. Northern Telecom, Lee Mann Smith McWilliams Sweeney & Ohlson, December 7, 1999: US05999132 (46 worldwide citation)
  3. David Maldonado: Dual band antenna. Qualcomm Incorporated, Russell B Miller, Roger W Martin, September 22, 1998: US05812097 (44 worldwide citation)
  4. Eric B Rodal: Dual frequency vertical antenna. Trimble Navigation, David R Gildea, February 18, 1997: US05604506 (43 worldwide citation)
  5. Glen J Seward, Paul E Miller: Multiband antenna system. R A Miller, Varnum Riddering Schmidt & Howlett, March 31, 1998: US05734352 (34 worldwide citation)
  6. Glen J Seward, Paul A Bogdans: Radio frequency multiplexer for coupling antennas to AM/FM/WB, CB/WB, and cellular telephone apparatus. R A Miller, Rader Fishman Grauer & McGarry, October 2, 2001: US06297711 (29 worldwide citation)
  7. Glen J Seward, Paul E Miller: Multiband antenna system. R A Millier, Rader Fishman Grauer & McGarry an office of Rader Fishman & Grauer PLLC, August 22, 2000: US06107972 (19 worldwide citation)
  8. Dean Kitchener, Julius George Robson: Dual radio antenna. Nortel Networks Corporation, John D Crane, November 30, 1999: US05995065 (12 worldwide citation)
  9. Yew S Tay, Danny O McCoy, Quirino Balzano: Broadband end fed dipole antenna with a double resonant transformer. Motorola, M Mansour Ghomeshi, Juliana Agon, October 8, 1996: US05563615 (12 worldwide citation)
  10. Donn V Campbell, Carlton H Walter, Robert V DeVore: Charge collector equipped, open-sleeve antennas. TRW, Michael S Yatsko, July 29, 1997: US05652598 (9 worldwide citation)

References: 2

  1. George Ploussios: Multi-frequency antenna employing tuned sleeve chokes. April 2, 1985: US04509056 (65 worldwide citation)
  2. June, 1971: US3588903