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Experimental study of composite medium with simultaneously negative permeability and permittivity

Science China(Physics,Mechanics & Astronomy) 2004年第1期47卷 64-78页

作者： SUI Qiang1, 2 & LI Fang1 1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China 2. School of Information, Beijing Broadcasting Institute, Beijing 100024, China Correspondence should be addressed to Sui Qiang (email: suiqiang@***) Received July 28, 2003 Institute of Electronics Chinese Academy of Sciences Beijing 100080 China

This paper focuses on a composite medium structure that exhibits simultan- eously negative values of effective permeability and permittivity, and our experimental study in an anechoic chamber. The experiment results show that the artificial medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous metallic wires, can have a simultaneously negative effective permeability and permittivity within a frequency region in the microwave regime under certain linearly polarized waves.

关键词： permittivity, permeability, negative index of refraction, split ring resonator, LHM, RHM.

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A micromechanical bridge-shaped voltage-controlled oscillator

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Science China(Technological Sciences) 2004年第1期47卷 26-32页

作者： HAN Jianqiang ZHU Changchun ZHAO Hongpo LIU Junhua SHAO Jun Xi'an Jiaotong University Xi'an 710049 China Xi'an Jiaotong University Xi'an 710049 China Xi'an Jiaotong University Xi'an 710049 China Xi'an Jiaotong University Xi'an 710049 China Xi'an Jiaotong University Xi'an 710049 China

A novel micromechanical bridge-shaped voltage-controlled oscillator with high Q value was fabricated. The core of this kind of oscillators is an electrothermally excited and piezoresistively detected micromechanical bridge resonator. Its resonance frequency can be adjusted by changing the DC voltage applied to the Wheatstone bridge. Theoretical analysis and experimental data show that its resonance frequency is linear with the square of the DC voltage. The linearity is better than 0.16% and the adjustable frequency range excels 17.15%.

关键词： voltage-controlled oscillator, microbridge, resonator, MEMS.

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Theoretical and experimental researches on C-band three-cavity transit-time effect oscillator

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Science China(Physics,Mechanics & Astronomy) 2004年第3期47卷 310-329页

作者： FAN Zhikai1, LIU Qingxiang1, CHEN Daibing1, TAN Jie1 & ZHOU Haijing2 1. Institute of Applied Electronics, Chinese Academy of Engineering Physics, Mianyang 621900, China 2. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China Institute of Applied Electronics Chinese Academy of Engineering Physics Mianyang 621900 China

The C-band three-cavity transit-time effect oscillator (3C TTTO) is a novel high power microwave device based on the transit-time effect of the three-cavity (3C) resonator. The operational principle of this device is briefly expounded in this paper, and the theoretical and experimental researches on the radial insulation diode, the 3C resonator, the double-gap output cavity and the circular waveguide bevel cut radiation antenna are presented in detail. By using the analytic method, the eigen modes and their field distributions of the 3C resonator are developed, and some basic laws of the transit-time effect are obtained in non-π mode field of the 3C resonator. At last, the experimental results are given. This device generated RF peak power in excess of 400MW with 15ns FWHM, and its beam-wave power conversion efficiency is about 17%.

关键词： C-band, three-cavity (3C) resonator, transit-time effect, high power microwave, oscillator.

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