天线basic
1.实际应用时,按内置天线还是外置天线考虑。
内置时,净空区在 PCB 上所有层(all layer) 不能放置元件,走线和铺 GND
天线远离金属,至少要距离周围有较高的元器件 10 毫米以上;
天线必须放置在板边,放置在板内会极大削弱天线性能;
天线部分不能被金属外壳遮挡,塑料外壳需要距离天线至少 10 毫米以上;
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