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42. 发明授权

US5128686A Reactance buffered loop antenna and method for making the same 失效
标题翻译：电抗缓冲环形天线及其制作方法
公开(公告)号：US5128686A
公开(公告)日：1992-07-07
申请号：US572306
申请日：1990-08-27
申请人： William Tan , Robert Kurcbart
发明人： William Tan , Robert Kurcbart
IPC分类号： H01Q1/27 , H01Q7/02
CPC分类号： H01Q1/273 , H01Q7/02
摘要： A reactance buffer maintains a substantially constant reasonant frequency for an adjustable size loop antenna having first and second antenna segments. Each segment has first and second ends, the first ends being coupled to a receiver, and the second ends providing loop size adjustment. The reactance buffer comprises a reactance buffer input coupled to the second end of the first antenna segment. A plurality of taps are linearly disposed along a longitudinal axis of the first wristband section, and has a predetermined length between the outermost taps corresponding to the loop antenna size adjustment required. The taps provide selectable reactance buffer outputs for coupling to the second end of the second antenna segment. A plurality of reactance elements are arranged non-serially and couple the reactance buffer input to each of the plurality of taps and provide a substantially constant reactance measured between the reactance buffer input and each of the plurality of taps.
摘要翻译：电抗缓冲器为具有第一和第二天线段的可调节尺寸的环形天线保持基本恒定的归一化频率。每个段具有第一和第二端，第一端耦合到接收器，并且第二端提供环尺寸调节。电抗缓冲器包括耦合到第一天线段的第二端的电抗缓冲器输入端。沿着第一腕带部分的纵向轴线线性地设置多个抽头，并且在与所需的环形天线尺寸调整相对应的最外部抽头之间具有预定的长度。抽头提供用于耦合到第二天线段的第二端的可选择的电抗缓冲器输出。多个电抗元件非串联地布置并且将电抗缓冲器输入耦合到多个抽头中的每一个，并提供在电抗缓冲器输入和多个抽头中的每一个之间测量的基本上恒定的电抗。

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