Design and Microwave Measurement of a Broadband Compact Power Coupler for Sheet Beam Traveling Wave Tubes

作者：Wang, Jianxun^*; Liu, Guo^*; Shu, Guoxiang^*; Yang, Liya^*; Luo, Yong^*

来源：IEEE Transactions on Electron Devices, 2016, 63(2): 814-818.

DOI：10.1109/TED.2015.2508480

• Curved Bragg resonator
• microwave measurement
• multistage stepped waveguide
• novel input and output couplers for broadband power coupler
• sheet beam traveling wave tube (TWT)

Novel compact input and output couplers for broadband operation of sheet beam traveling wave tubes are analyzed, designed, and cold tested. Multistage stepped waveguide and cascaded Bragg resonators are proposed and applied to improve the performance and extend the operating bandwidth. Optimized curve-Bragg resonators are studied to correct the phase between the reflector and H-bend waveguide, which bring about a further enhancement of the coupler behavior. HFSS simulations predict a -3 dB transmission bandwidth about 38% and 34% are achieved, respectively, in Ku and Q band. Besides, the large beam tunnel property of this kind of coupler benefit the beam transport of sheet beam devices. Different components as the input and output couplers for Ku-and Q-band SB-TWT are manufactured and cold tested. Results of vector network analyzer measurement and simulation present an excellent agreement.

• 出版日期2016-2
• 单位电子科技大学