一种新型广义交叉耦合滤波器的设计

Design of a Novel Filter with General Cross-Coupling

含广义交叉耦合的N个谐振器滤波器,即含源-负载交叉耦合的滤波器能产生N个传输零点,通过给出这种滤波器的等效网络模型和传输函数,设计了两种新颖六边形结构的含源-负载交叉耦合的微带滤波器,一种为对称结构,一种为非对称结构.对其进行了仿真分析,仿真结果与理论值吻合较好.与传统两腔发夹形滤波器相比,这种两腔六边形结构的滤波器尺寸要缩小27.5%,频率选择性更高.

A new coupling direct between the source and the load to yield two additional transmission zeros. A general method is presented for synthesizing microwave filter with source-load cross coupling. The equivalent circuit of the low-pass prototype of a general lossless coupled resonator filter is proposed, and the corresponding transfer function t （s） is derived. Then, two novel hexagonal open-loop quasi-elliptic resonator microstrip filters are designed, one symmetric and the other asymmetric, are designed and simulated. Compared with the conventional cross coupling filter, the proposed filter of two pole hexagonal open-loop resonator filter acquires more than 27. 5% size reduction and provides an improved selectivity by a relatively small band-width.