High-reliability and wide-band horizontal transition structure

The invention discloses a high-reliability and wide-band horizontal transition structure. The high-reliability and wide-band horizontal transition structure is characterized by comprising a box body,a soft matrix transmission line and a high- and low-frequency composite substrate, wherein the soft matrix transmission line is pasted onto an upper surface of the box body and is cascaded with a transmission line on an upper surface of the high- and low-frequency composite substrate by a plurality of gold wires, and a lower surface of the box body is cascaded with a lower surface of the high- andlow-frequency composite substrate by a plurality of gold belts. Horizontal electrical connection between the lower surface of the box body and the lower surface of the high- and low-frequency composite substrate is performed by the gold belts, the impedance discontinuity is reduced, low-loss transmission of a millimeter-wave signal is further achieved, and the problem that the low-loss transmission of the millimeter-wave