| 1 | Mode Competition of Low Voltage Backward Wave Oscillator near 500 GHz with Parallel Multi-Beam显示文摘A backward wave oscillator with parallel multiple beams and multi-pin slow-wave structure(SWS)operating at the frequency above 500 GHz is studied.Both the cold-cavity dispersion characteristics and CST Particle Studio simulation results reveal that there are obvious mode competition problems in this kind of terahertz source.Considering that the structure of the multi-pin SWS is similar to that of two-dimensional photonic crystals,we introduce the defects of photonic crystal with the property of filtering into the SWS to suppress high-order modes.Furthermore,a detailed study of the effect of suppressing higher-order modes is carried out in the process of changing location and arrangement pattern of the point defects.The stable,single-mode operation of the terahertz source is realized.The simulation results show that the ratio of the output peak power of the higher-order modes to that of the fundamental mode is less than 1.9%.Also,the source can provide the output peak power of 44.8 mW at the frequency of 502.2 GHz in the case of low beam voltage of 4.7 kV. | Xiaoyan ZHAO Jincheng HUI Haoran ZHANG Sidou GUO Yuming FENG Lin TANG Kaichun ZHANG Diwei LIU | 2024 | Chinese Journal of Electronics2024，33，2： | 0 |
| 2 | Coupling Enhancement of THz Metamaterials Source with Parallel Multiple Beams显示文摘In this paper,we propose a terahertz radiation source over the R-band(220-325 GHz)based on metamaterials(MTMs)structure and parallel multiple beams.The effective permittivity and permeability of the slow-wave structure can be obtained through the S-parameter retrieval approach,using numerical simulation.Additionally,the electromagnetic properties of the MTMs structure are analyzed,including the dispersion and the coupling impedance.Furthermore,we simulate the beam-wave interaction of the backward oscillator(BWO)with MTMs structure and parallel multiple beams by 3-D particle-in-cell code.It is observed that parallel multiple beams can highly enhance the beam-wave interaction and greatly enlarge the output power.These results indicate that the saturated(peak)output power is approximately 63W with the efficiency of roughly 6%at the operating frequency of 231 GHz,under the beam voltage of 35 kV and total current of 30 mA(6-beam)respectively.Meanwhile,the BWO can generate power of 10-80 W in the tunable frequency of 220-240 GHz. | ZHANG Kaichun FENG Yuming ZHAO Xiaoyan HU Jincheng XIONG Neng GUO Sidou TANG Lin LIU Diwei | 2023 | Chinese Journal of Electronics2023，32，4： | 0 |
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