Composite bridge with frequency selection characteristic

The utility model discloses a composite bridge with frequency selection characteristic, comprising a bridge body, an input port, a straight-through port, a coupling port and an isolation port, the bridge body comprises a plurality of groups of matching lines, a plurality of groups of straight-through lines, a plurality of groups of interdigital coupling lines and at least one group of composite common lines, the input port, the straight-through port, the coupling port and the isolation port are electrically connected with the matching circuit, the matching circuit is electrically connected with the straight-through circuit and the interdigital coupling circuit, the interdigital coupling circuit is electrically connected with the straight-through circuit, and the composite common circuit is electrically connected with the straight-through circuit. The composite bridge with the frequency selection characteristic provided by the utility model has the frequency selection characteristic in a working frequency band