发明授权
- 专利标题: Locator antenna with conductive bobbin
- 专利标题(中): 定位天线带导电线轴
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申请号: US12367254申请日: 2009-02-06
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公开(公告)号: US08400154B1公开(公告)日: 2013-03-19
- 发明人: Mark S. Olsson , Stephen M. Bench , Ryan B. Levin , Ray Merewether
- 申请人: Mark S. Olsson , Stephen M. Bench , Ryan B. Levin , Ray Merewether
- 申请人地址: US CA San Diego
- 专利权人: SeekTech, Inc.
- 当前专利权人: SeekTech, Inc.
- 当前专利权人地址: US CA San Diego
- 代理商 Steven C. Tietsworth
- 主分类号: G01V3/08
- IPC分类号: G01V3/08
摘要:
An antenna useful in an antenna array of a man-portable buried utility locator includes a flexible bobbin made of copper foil. The bobbin has a plurality of axially spaced grooves and an axially extending gap formed therein. A layer of insulation surrounds an outer surface of the bobbin. A conductive wire is disposed in the grooves and wound around the bobbin over the layer of insulation to form a plurality of axially spaced sub-coils. A layer of copper-foil tape having an insulating backing is wound about the conductive wire and has a second gap aligned with the gap in the bobbin. A layer of a low dielectric material is wound about the copper-foil tape. The antenna provides more antenna wire surface for an equivalent coil cross-sectional area, compared to prior art antennas, thus yielding greater sensitivity. The construction of the antenna provides a series of Faraday-shielded sub-coils, which yield a greater useful antenna bandwidth by moving the inherent resonance of each coil to a higher frequency. The construction of the antenna also reduces inherent winding capacitance and provides a self-shielding effect that further improves sensitivity.