The application relates to a high-power directional coupler for real-time measurement of high-power
circular waveguide transmission energy. The design comprises a
circular waveguide, two
coupling holes and two rectangular waveguides vertically connected with the
circular waveguide. High-power microwaves are transmitted in the circular
waveguide, the two
coupling holes are arranged on the wall surface of the circular
waveguide, and the center distance is
lambda / 4+n*
lambda / 2 (
lambda is the transmission
wavelength, and n is a non-negative integer). The rectangular
waveguide is vertically connected with the circular waveguide through the
coupling hole, and the short side of the rectangular waveguide is parallel to the axial direction of the circular waveguide, which is used for receiving coupled energy and measuring transmission power through a
power sensor. By averaging the transmission energy at the two coupling holes, the interference error caused by the echo is eliminated, and the forward transmission energy is accurately measured. The design effectively avoids the fluctuation problem in single-hole measurement, has the advantages of wide
frequency band, low coupling coefficient, high reliability and high power resistance, and is suitable for real-time measurement and monitoring of high-power
microwave system energy.