What is not in dispute: the iPhone 4 antenna has a weak spot in the lower-left corner of the frame, marked by the black line in the frame.
毫无争议的是：iPhone 4 的天线在金属框的左下角有一个弱点，就在框上的黑线处。
The emphasis in this paper was corner reflector antenna with high-gain, narrow beam and low side-lobe.
选用方向性好、增益高、旁瓣低的角形反射器天线作为本论文的研究重点。
In this text two 3d corner reflector antenna modifications are described.
本文描述对3d角反射器天线的两处修改。
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