Farfield measurement method of high power microwave in radiation field

The measurement layout of the high power microwave in radiation field, which includes measuring the distance, the integral angle range, and the equality of E-plane and H-plane, is researched with numerical methods. The influence of measurement layout on the experimental results in radiation field is studied by the X-band magnetron and 20 dB horn as well as 680 mm horn with an input power of 407 kW. And the measurement layout is validated by the X-band 9.3 GHz and 9.7 GHz relativistic back wave oscillator. Experimental results show that accurate results can be got by the integral angle control if the equality of E-plane and H-plane is well, even though the measurement distance does not satisfy the far-field condition.