Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1997-07-15
1999-11-02
Wong, Don
Communications: radio wave antennas
Antennas
Spiral or helical type
343872, 29600, H01Q 136
Patent
active
059779314
ABSTRACT:
A low visibility, field-diverse antenna provides cross-polarized fields enhancing signal communications. A generally flat, but helical, antenna is achieved in conjunction with a core substrate about which the antenna is wrapped, wound, or fixed. The core substrate, pitch or angle of the helix, and length of the transmitting antenna are chosen for a specific resonant frequency. The length and width of the helix are chosen in order to dimension the helical antenna between its linear and circular polarization modes to thereby deliver field-diverse and cross-polarized transmission modes. In order to optimize the manufacturing process, holes may be created within the substrate. These holes are plated with conducting material so that conducting foil on opposite faces of the substrate may be electrically connected. The holes may be offset according to the pitch of the helix. Once the transmitting antenna has been fabricated upon the core substrate, the margin between the plated-through holes and the edge of the substrate may be separated by cutting, sawing, or stamping.
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Antenex, Inc.
Ho Tan
Wong Don
LandOfFree
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