Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2005-07-05
2005-07-05
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S741000
Reexamination Certificate
active
06914580
ABSTRACT:
A dielectrically-loaded loop antenna with a cylindrical dielectric core, a feeder structure passing axially through the core, a sleeve balun encircling one end portion of the core and helical antenna elements extending from a feed connection with the feeder structure at the other end of the core to the rim of the balun. The antenna elements are arranged as a pair of laterally opposed groups of conductive elongate helical elements each having at least first and second conductive elements of different electrical lengths to form a plurality of looped conductive paths. By forming at least one of the conductive elements in each group as a conductive strip with one or both edges meandered, such that the edges of the strip are non-parallel and have different electrical lengths, additional modes of resonance arc created, yielding an improvement in bandwidth.
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Search Report Under Section 17(5), Patents Act of 1977, British Patent Office, issued in connection with Application No. GB 0307251.9 issued on Jul. 18, 2003.
John Bruckner PC
Phan Tho
Sarantel Limited
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