Miniature high-selectivity relay station

A miniature high-selectivity relay station comprises a case and a bidirectional RF signal amplifying circuit board, and further comprises a rectangular double-diplexer composed of cavity filters, wherein the double-diplexer and the case are integrated; the two side walls of the double-diplexer are integrally superposed with the two side walls of the chassis; the sealed cover plates at the front and back ends of the double-diplexer are integrally superposed with the upper and lower cover plates of the chassis; the bidirectional RF signal amplifying circuit board is mounted on the lower base plate of the double-diplexer; and the input and output terminals of the bidirectional RF signal amplifying circuit board are directly welded with the outgoing lines at the corresponding input and output terminals of the double-diplexer. The double-diplexer and the case are integrated, which is convenient for primary extrusion forming of the miniature high-selectivity relay station, which has small volume, low cost, high RF