Multiband microwave small-sized mixed bridge

The utility model relates to a multi-frequency and small-sized microwave bridge, consisting of three dielectric slabs, namely 5, 7 and 9, two layers of coupled circuit boards, namely 6 and 8, a RF input port 1, a mainline output port 2, an isolation port 3 and a coupled output port 4. Wherein, the dielectric slabs and the coupled circuit boards are in alternative distribution, with the two layers of coupled circuit boards sandwiched respectively among the three layers of dielectric slabs. Moreover, the RF input port 1 and the mainline output port 2 are connected with the coupled circuit board (8), and the isolation port 3 and the coupled output port 4 are connected with the coupled circuit board (6), with the output amplitude of both the coupled output port 4 and the mainline output port 2 as 3dB but the phase position 90-degree away, and thereby various connections of the four ports can make of components of various purposes. The Bridge has the advantages of small volume, light weight, selectable bandwidth and favorable performance in a plurality of microwave regions, and thereby can widely be used for the wiring system in mobile communication base station or repeater station.