Parallel-connected linear phase filter can be achieved when the group delays of sub-networks compensate each other.

We give the coupling and routing diagrams of four linear phase filters with self-synthesized coupling matrixes, and verified the correctness of theory data and the feasibility of the circuit design.

There are a variety of topological coupling and routing diagrams for a same order filter.

We give a reasonable arrangement of design steps for high-order parallel-coupled linear phase filter.