In passive section , above all , i introduce theory about microstrip line . millimeter - wave band - pass filter and wave guide - to - microstrip transition . designing two type of coverer by image - reject mixer and hmc329 无源电路部分，我们首先对传输线的种类，耦合微带线的传输特性和微带波导过渡的基本原理进行了分析。
