Broadband high efficiency full wave open coaxial stub loop anten

Details Broadband high efficiency full wave open coaxial stub loop anten Broadband high efficiency full wave open coaxial stub loop anten

1994-08-15

1996-01-16

Hajec, Donald T.

Communications: radio wave antennas

Antennas

High frequency type loops

343743, 343842, H01Q 1112

Patent

active

054851653

ABSTRACT:
A broadband, high-efficiency loop radiator is characterized by a coaxial loop one wavelength in circumference with a continuous center conductor fed through a coaxial T feed and a discontinuity of the outer shield next to the feed point of 50 ohms input impedance. Radiation occurs as a result of this transmission line discontinuity resulting in a reflected wave back down the shield. The one wavelength dimension of the loop generates two in phase electric dipoles spaced one diameter apart resulting in a bidirectional radiation pattern of 3 dBil and a 30% operational bandwidth due to the frequency compensation of the open stub. The open stub loop antenna acts as a low loss parallel tuned circuit appearing across a generator and the series impedance of the loop antenna resulting in increased bandwidth.

REFERENCES:
patent: 2423083 (1947-07-01), Daubaras
patent: 2495747 (1950-01-01), Lundburg
patent: 2615134 (1952-10-01), Carter
patent: 3902177 (1975-08-01), Mori et al.
patent: 4083006 (1978-04-01), Yakoshima
patent: 4983985 (1991-01-01), Beatty
patent: 5363113 (1994-11-01), Mametsa et al.
Investigation of Parasitic Loop Counterpoise Antenna, Sengupta et al, IEE ansactions on Antenna and Propagation, vol. AP-17, No. 2, Mar. 1969 pp. 180-191.

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