A Mode Converter with Multi-waveguide Output from the TE 01 Circular Waveguide Mode to the TE 10 Rectangular Mode for Mi
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A Mode Converter with Multi-waveguide Output from the TE01 Circular Waveguide Mode to the TE10 Rectangular Mode for Millimeter Wave Gyro-device Applications Yin Li & Chongqing Jiao & Jirun Luo
Received: 6 July 2007 / Accepted: 17 September 2007 / Published online: 10 October 2007 # Springer Science + Business Media, LLC 2007
Abstract A mode converter with multi-waveguide output for millimeter wave gyro-device applications is proposed in this article, which is used to convert the TE01 circular waveguide mode into the TE10 rectangular waveguide mode. Computer simulations with Ansoft HFSS code show that the energy transmission coefficient of larger than 95.96% may be reached in the frequency range from 34.094 GHz to 35.8 GHz (a bandwidth of 1.706 GHz) at a VSWR of lower than 1.5 for the input operating mode. Keywords Gyro-device . Mode converter . VSWR . Multi-waveguide output
1 Introduction Based on electron cyclotron maser instability, gyro-devices can generate high power electromagnetic radiation in millimeter and sub-millimeter wavelength ranges [1–3]. To achieve higher power capacity, gyro-devices usually operate at high order mode of circular waveguide. Therefore, mode converter plays an important role in the gyro-device applications. Usually, it is used to converts an input wave into the operating mode in gyro-device interaction circuit or couples the output operating mode into some expected mode for further applications. The characteristics of the mode converter have direct impacts on the stability and reliability of the gyro-device operation [4, 5]. There are usually two ways for gyro-device power output, first, the high order mode is directly output from axial direction; the second, the high order mode is converted to a quasi-optical Gaussian-beam with inner- or outer- quasi-optical mode converter [6–8]. High order mode is not usually a linear polarized one, its propagation in an overmoded Y. Li (*) : C. Jiao : J. Luo Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China e-mail: [email protected] Y. Li : C. Jiao Graduate University of Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
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Int J Infrared Milli Waves (2007) 28:1155–1160
waveguide may excite many other modes because of any unhomogeneity. Therefore, it’s not appropriate to use a high order mode for long distance propagation. In addition, single mode with linear polarization is required in a radar system. In this article, the design of a mode converter for gyro-device power output is presented. With the converter, the operating mode (TE01 circular waveguide mode) in a gyro-amplifier can be efficiently converted into the TE10 rectangular waveguide mode with four coupling holes distributed uniformly on a circular waveguide wall. Such output conversion way can bring some practical benefits. First, the TE10 mode has very good characteristics in a single mode propagation way; second, by dividing the output power of the gyro-amplifier into four equal parts, the problem resulted fr
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