給出了Ka 波段相對論繞射輻射振蕩器(RDG)的輻射功率測量方法和實驗結(jié)果。器件采用帶反射器兩段式過模慢波結(jié)構(gòu)，由于器件的過模結(jié)構(gòu)特點，實驗選擇用空間積分方法測試輻射功率。在準確標定測量系統(tǒng)的基礎上進行了熱測實驗，得到了輻射模式圖和輻射總功率。測試結(jié)果表明：微波輻射功率超過300 MW，信號脈寬大于10 ns，輻射頻率介于34～38 GHz之間，輻射模式為TM0n模。
關 鍵 詞 繞射輻射振蕩器; 輻射場測量; 輻射模式; 方向圖

Abstract This paper presents the method and results of measurement of radiation power for Ka-band relativistic diffraction generator. The RDG device has two section slow wave structure. For the character of complete overmoded SWS, the spatial integral method of the radiation power measurement is carried out. The radiation mode image and total power are obtained by hot test, which is based on precisely calibrating of the measurement system. The measurement results show that the radiation power exceeds 300 MW with a frequency of 34~38 GHz and a pulse width exceeds 10 ns, and the radition mode is TM0n mode.
Key words relativistic diffraction generator; radiation field measurement; radiation mode; radiation pattern