Abstract An extended interaction oscillator (EIO) generating 120 GHz wave in sub-terahertz waves is studied by using the three-dimensional electromagnetic simulation software CST and PIC codes. A rectangular reentrant coupled-cavity is proposed as the slow-wave structure of EIO. By CST, the circuit parameters including frequency-phase dispersion, interaction impedance and characteristic impedance are simulated and calculated. The operation mode of EIO is chosen very close to the point where $\beta L=2\pi$ with corresponding frequency 120 GHz, the beam voltage 12 kV and the dimensions of the cavity with the period 0.5 mm, the height 3 mm and the width 1.4 mm. Simulation results of beam--wave interaction by PIC show that the exciting frequency is 120.85 GHz and output peak power 465 W with 12-period coupled-cavity with the perveance 0.17 $\mu$P. Simulation results indicate that the EIO has very wide range of the operation voltage.
Received: 14 September 2007
Revised: 16 April 2008
Accepted manuscript online:
PACS:
84.30.Ng
(Oscillators, pulse generators, and function generators)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10676110) and the
National Basic Research Program of China (Grant No 2007CB310401).
Cite this article:
Zhang Kai-Chun(张开春), Wu Zhen-Hua(吴振华), and Liu Sheng-Gang(刘盛纲) Study of a rectangular coupled cavity extendedinteraction oscillator in sub-terahertz waves 2008 Chin. Phys. B 17 3402
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