说明：  微波电路及其PCB 设计，本文主要针对通讯产品的一个前沿范畴棗微波级高频电路及其PCB 设计方面的理念及其设计原则
(Microwave circuits and their PCB designs, this paper aimed at a cutting-edge communications products areas Calligonum microwave high-frequency circuits and PCB-level design concepts and design principles)