Electrically-controlled attenuator for multi-tube-array ridge waveguide

The utility model relates to an electrically-controlled attenuator for a multi-tube-array ridge waveguide. A diode is installed in a wideband ridge waveguide (16). The wideband ridge waveguide is divided into an upper half part (11) and a lower half part (12). A ridge (15) of a waveguide and an SMA joint output hole (14) are arranged on the lower half part (12). The upper half part (11) and the lower half part (12) form a waveguide cavity (13). A plurality of circular grooves are arranged on the cavity of the ridge waveguide. SMA joints (9) are arranged at the two sides of the ridge waveguide (16). The utility model has the advantages that the transmission characteristic is favorable and the insertion loss is small under high-frequency band, the input and output standing-wave characteristics are improved according to the fabrication technology of the ridge waveguide and the manufacturing cost is reduced.