Yagi antenna with balancing tab

Details Yagi antenna with balancing tab Yagi antenna with balancing tab

2007-10-23

2007-10-23

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S810000, C343S812000, C343S813000, C343S814000, C343S815000, C343S816000, C343S817000, C343S818000, C343S819000

Reexamination Certificate

active

11449294

ABSTRACT:
An antenna minimizes radiation from the outer conductor (44) of a coaxial cable (40) that is coupled to the antenna by providing a balancing tab (90) that lies near the connection (72) of the cable outer conductor (44) to the antenna. One antenna includes a Yagi structure (12) constructed of a plate of metal that forms a long boom (20) and a plurality of directors (28) extending laterally across the boom, with an electrical coupling loop mounted at a rear region of the Yagi structure. The coupling loop includes a folded dipole in the form of a metal coupling plate that forms a loop (54) with a gap (70), the loop having a laterally elongated front loop end (60). The Yagi structure is formed with a balancing tab (90) that lies forward of the loop, that has a lateral length (D) less than half that of one of the directors, and that extends from only one side (22) of the boom which is the side to which the outer coax conductor (44) is connected to the loop. The metal coupling plate lies facewise adjacent to a face (24) of the Yagi plate, with a dielectric spacer (76) between them.

REFERENCES:
patent: 4218686 (1980-08-01), Blonder
patent: 5898410 (1999-04-01), DeMarre
patent: 6326922 (2001-12-01), Hegendoerfer
patent: 6483476 (2002-11-01), Cox
patent: 2006/0066441 (2006-03-01), Knadle et al.

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