Monolithic quadrifilar helix antenna
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United States of America Patent
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-
Jul 30, 1996
Issued Date -
N/A
app pub date -
Jul 7, 1994
filing date -
Oct 21, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A quadrifilar helix antenna containing a hybrid junction power divider feed circuit and a plurality of radiating elements. The radiating elements are connected on one end to the hybrid junction power divider feed circuit and are free to radiate on the other end. In a particular embodiment, the antenna includes a microstrip hybrid junction power divider feed circuit deposited on the lower rectangular section of a dielectric substrate. The hybrid junction power divider feed circuit provides both a 0 to 180 degree phase shift and impedance matching. The antenna also includes four radiating microstrip elements deposited on the upper section of the dielectric substrate at a predetermined angle to form a helical pattern upon turning the planar antenna into a cylinder. The radiating elements are connected to the microstrip hybrid junction power divider feed circuit in pairs. The first pair is connected to the hybrid junction power divider feed circuit at the location of the 0 degree phase shift whereas the other pair is located at the 180 degree phase shift location. The second element of each pair is shorter than the first element by a predetermined distance to provide a phase quadrature between them. Therefore through this method, the required phase relationships for a circularly polarized beam pattern are achieved.
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