Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1988-02-08
1990-05-08
Hille, Rolf
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343895, H01Q 136
Patent
active
049242385
ABSTRACT:
A resonant helical antenna capable of being tuned electronically over a broad range of frequencies. The helical turns of the radiating portion of the antenna are formed of tubular material which may be in the form of a single length of tubing or may comprise a number of parallel coaxial cables with their outer conductors in electrical contact. The antenna is tuned by a series of oppositely poled pairs of diodes that are connected at spaced points to the radiating coils of the antenna. When the diodes are biased to be conducive, a section of the radiating helix is short-circuited. Bias voltages to control the diodes are provided by leads inside the radiating turns of the helix. Each lead for a pair of diodes emerges at a point electrically balanced between the two spaced points that are connected to the associated diodes. No r-f potential exists between the outer and inner conductor of the radiating runs at the point where the bias lead emerges, so no r-f current flows in the bias lead wires.
The antenna may include spaced cpacitance elements and may be in the form of a monopole helical antenna or it may be in the form of a dipole antenna with two oppositely-disposed arms.
REFERENCES:
patent: 3089140 (1963-05-01), Monola
patent: 4502025 (1985-02-01), Carl et al.
patent: 4564843 (1986-01-01), Cooper
patent: 4656483 (1987-04-01), Jaquet
Barrett E. T.
Hille Rolf
Wimer Michael C.
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