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    • 8. 发明授权
    • Locator antenna with conductive bobbin
    • 定位天线带导电线轴
    • US08400154B1
    • 2013-03-19
    • US12367254
    • 2009-02-06
    • Mark S. OlssonStephen M. BenchRyan B. LevinRay Merewether
    • Mark S. OlssonStephen M. BenchRyan B. LevinRay Merewether
    • G01V3/08
    • G01V15/00
    • 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.
    • 用于便携式埋地式实用定位器的天线阵列中的天线包括由铜箔制成的柔性线轴。 线轴具有多个轴向隔开的槽和在其中形成的轴向延伸间隙。 绝缘层围绕线轴的外表面。 导线布置在沟槽中并围绕线轴缠绕在绝缘层上以形成多个轴向隔开的子线圈。 具有绝缘背衬的一层铜箔带卷绕在导线上,并且具有与线轴中的间隙对准的第二间隙。 一层低介电材料缠绕在铜箔带上。 与现有技术的天线相比,天线为等效线圈横截面积提供更多的天线导线表面,从而产生更高的灵敏度。 天线的结构提供了一系列法拉第屏蔽子线圈,通过将每个线圈的固有谐振移动到更高的频率,产生更大的有用的天线带宽。 天线的结构也降低固有的绕组电容,并提供进一步提高灵敏度的自屏蔽效果。