Do I have to protect PCB from radio frequency reflection?

For low power devices, they are probably safe even if all the power is reflected. If you generate more power than you need then feed the output through an attenuator it will reduce the effects of any reflected power.

例如, a 6dB attenuation will reduce the forward power by a factor of 4, but any reflected power will be reduced by an additional factor of 4 on the return trip, which gives a factor of 16 reduction in any reflected power.

These effects can normally be ignored on low-power devices (VCOs, PLLs, 等等) that can tolerate operating into a mismatched load with no ill-effects. They don’t need any special protection.

For special-purpose devices, the datasheet will often have limits or recommendations to protect them.

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Oliver 是一位經驗豐富的電子工程師,擅長 PCB 設計, 類比電路, 嵌入式系統, 和原型製作. 他的深厚知識涵蓋原理圖捕捉, 韌體編碼, 模擬, 佈局, 測試, 和故障排除. Oliver 擅長利用他的電氣設計才能和機械才能將項目從概念到大規模生產.


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