Broad band antenna structure
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 14, 1996
Grant Date -
N/A
app pub date -
Jul 30, 1991
filing date -
Jul 30, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna structure is provided having one or more spiral antenna arms extending outwardly from a lateral center axis. Each arm is defined by an antenna element disposed in a zig-zag configuration to provide reactive loading to the arm, wherein each arm receives or transmits radio frequency waves about a longitudinal center axis of the arm and the zig-zag element configuration. Thus, the antenna structure has a broader bandwidth than other antennas requiring the same amount of space. The antenna structure also has a substantially omni-directional radiation pattern and a low profile. Each antenna element can be metallisation disposed on a support structure or can be one or more cable conductors. A feed means is provided which can be connected to the elements proximate to the lateral center axis and positioned along or coincident with the longitudinal center axis of one arm or can be connected to one of the elements distal to the lateral center axis. In both methods of feeding the antenna arms, the antenna elements function as part of an infinite balun. In one application, the antenna structure is secured within the non-metallic roof structure of an automobile.
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