The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced.

该文从能量守恒观点出发，讨论了副面为椭圆的环焦天线的口径场分布，并导出了计算其方向图的简单表达式。

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The results show that the developed antenna choke ring can effectively reduce the multi-path effects and can improve the interference-resistant ability of the single frequency GPS receiver, NTSCGPS-1.

结果表明，研制的天线扼流圈可有效地削弱多路径效应的影响，并可明显地改善单频GPS接收机ntscgps - 1的抗干扰能力。

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Rotate the SKIM and its mounting bracket downwards and then to the side away from the steering column to slide the SKIM antenna ring from around the ignition switch lock cylinder housing.

向下旋动skim及其安装托架，然后向转向柱侧面旋转，将skim天线环滑动到点火开关锁柱插槽附近。

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On this day, the One World Trade Center workers were lowering in to place the very first ring that would support the spire, or antenna, of the tower.

FORBES: A Tour Of One World Trade Center

Inside, there's a replaceable CR2016 watch battery that's said to last more than a year, a Bluetooth module and antenna, an LED-lit ring and a piezoelectric speaker.

ENGADGET: StickNFind Bluetooth stickers let you tag and locate your goods with a smartphone (hands-on video)