Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1997-01-27
1998-07-21
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Spiral or helical type
343872, H01Q 136
Patent
active
057840342
ABSTRACT:
Herein is revealed a helical antenna apparatus wherein the direction of beam radiation hardly changes even if the frequency in use changes. Two helical antennas which are wound with two conductive wires spirally, respectively, at equal intervals with a specified pitch .alpha. in the form of a cylinder are disposed along the length of the helical antennas so that the axes thereof substantially coincide with each other. By determining the lengths of the feeders of the respective helical antennas appropriately in order to set the phase of supplied power, it is possible to form the beam of signals radiated into space in the shape of conical beam having a directivity oriented obliquely upward. Additionally, it is possible to obtain the conical beam in which the direction of beam radiation does not change even if the frequency in use is changed.
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Chatani Yoshiyuki
Katagi Takashi
Konishi Yoshihiko
Matsunaga Makoto
Ohtsuka Masataka
Hajec Donald T.
Mitsubishi Denki & Kabushiki Kaisha
Phan Tho
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