Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1994-05-24
2000-01-04
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Spiral or helical type
343859, H01Q 136, H01Q 1108
Patent
active
060115246
ABSTRACT:
Disclosed herein is a low profile quadrifilar helix antenna system having the non-fed ends of the helix conductor arms shorted to a first ground plane, the ground plane mounted below the helix. The first ground plane is mounted perpendicularly to the central axis of the helix and extends radially outward therefrom to form an effective electromagnetic shield between the helix and adjacent ground planes. The extension of the first ground plane combined with the shorted non-fed ends of the helix arms minimize the influence of placement of the antenna system near adjacent ground conductors on the VSWR performance of the antenna. The conical frustum geometry of the helix conductors is configured to provide a low profile, resonant antenna. An integrated signal conditioning network is mounted within a cavity defined between the first ground plane and a second ground plane below the first ground plane. The conductive elements of the network are thus shielded from influencing the radiation pattern of the antenna system. The perpendicular orientation of the electronics also provides an integrated antenna system having lower overall height. A refractive dielectric dome is provided enclosing the helix and electronics. The dome thickness and dielectric constant are selected to provide increased gain for the antenna system at low elevation angles, i.e. near the horizon.
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Trimble Navigation Limited
Wimer Michael C.
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