Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 67, Issue 6, Pages 2573-2579Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2020.2983585
Keywords
Asymmetric modes suppression; coaxial slow wave structure (SWS); high power microwave (HPM); millimeter-wave; V-band
Funding
- National Natural Science Foundation of China (NSFC) [61771482]
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In the design of the coaxial millimeter-wave Cerenkov devices due to the low starting current and high temporal growth, asymmetric quasi-TEv1 modes are always preferentially excited. This article proposes a new method of hybrid modes coupling to suppress the asymmetric modes. The results show that when the quasi-TEM (N-1)pi/N mode couples with the TM01 (N-3) pi/N mode, the asymmetric modes can be suppressed effectively. The external Q-factor, electric field distribution, and the beam conductance of the hybrid modes are analyzed theoretically to explain the mechanism of the asymmetric modes suppression. According to this method, a coaxial V-band millimeter-wave oscillator is proposed. The 3-D particle-incell simulation results show that the symmetric modes are generated and all the asymmetric modes are suppressed successfully. When the diode voltage is 355 kV and beam current is 3 kA, the dominant frequency is 62.6 GHz and the output power is 322 MW, corresponding to a beam-wave conversion efficiency of 30.2%.
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