Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1996-12-24
2000-02-15
Wong, Don
Communications: radio wave antennas
Antennas
Spiral or helical type
343700MS, 343702, H01Q 124, H01Q 136
Patent
active
060258160
ABSTRACT:
An antenna operable in two disparate frequency bands is disclosed as including a first quadrifilar helix having four conductive elements arranged helically to define a cylinder of substantially constant radius, where the first quadrifilar helix is formed of two bifilar helices arranged orthogonally and excited in phase quadrature. A quadrature feed network is connected to the first quadrifilar helix, wherein one end of a coupling element thereof is connected to a first end of each conductive element. The quadrature feed network also includes a first feedpoint for operation of the antenna with circular polarization in a first frequency band and a second feedpoint for operation of the antenna with linear polarization in a second frequency band. The antenna may include a second quadrifilar helix connected to the quadrature feed network and having four conductive elements arranged helically to define a cylinder of substantially constant radius, where the second quadrifilar helix is formed by two bifilar helices arranged orthogonally and excited in phase quadrature. The second quadrifilar helix is wound in opposite sense with respect to the first quadrifilar helix so as to be conductively coupled therewith.
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Dent Paul
Hassan Amer
Ma Yawei
MacDonald James
Davidson James P.
Ericsson Inc.
Nguyen Hoang
Wong Don
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