Capacitatively shunted quadrifilar helix antenna

Details Capacitatively shunted quadrifilar helix antenna Capacitatively shunted quadrifilar helix antenna

2011-07-12

2011-07-12

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S745000, C343S749000

Reissue Patent

active

RE042533

ABSTRACT:
A quadrifilar helix antenna is provided having a feedpoint for the antenna connecting to individual helical antenna elements. A capacitive network, distributed along the length of the antenna, constitutes a variable frequency shunting network. At each position a first capacitive structure, that may comprise a single capacitor or multiple capacitors in series, interconnects a first pair of opposite antenna elements; a second capacitive structure interconnects the second pair of opposite antenna elements. As an applied frequency increases, the capacitive structures progressively short the opposite antenna elements thereby electrically reducing the antenna length.

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