For the selectivity improvement, several compact microstrip coupled-line BPFs with capacitive or inductive cross-couplings to create multiple transmission zeros are proposed in Chapter 4.

• 在改善选择度方面,第四章提出数个微小型微带线耦合带通滤波器,并且运用电容性或电感性之交叉耦合来产生多数个传输零点。