Millimeter Wave Multi-mode Transmission Line Components
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Millimeter Wave Multi-mode Transmission Line Components Gregory G. Denisov & Alexey V. Chirkov & Vladimir I. Belousov & Alexander A. Bogdashov & Galina I. Kalynova & Dmitry I. Sobolev & Yury V. Rodin & Evgeny M. Tai & Vladimir I. Ilin & Sergey Yu. Kornishin & Maxim L. Kulygin & Vladimir I. Malygin & Elena A. Soluyanova & Vladimir V. Parshin & Michael Yu Shmelev
Received: 29 November 2010 / Accepted: 3 December 2010 / Published online: 11 January 2010 # Springer Science+Business Media, LLC 2011
Abstract The present paper reports on the recent development of several oversized millimeter wave transmission line components for different applications. The studies include a circular TE11-to-Gaussian beam mode converting horn, a TM01-to-rotating TE31 mode converter, a TE11-mode 90° bend, a series of different HE11-mode transmission line components, a notch filter and a fast laser controlled semiconductor microwave switch. Keywords Oversized transmission lines . Mode converters . Bends . HE11 mode components . Notch filters . Semi-conductor microwave switches
1 Introduction Multi-mode components are often used for transmission and control of millimeter waves [1–3]. For example, large, comparing with wavelength, component sizes are absolutely mandatory for high-power millimeter waves in gyrotron-based electron-cyclotron-wave (ECW) systems of thermonuclear plasma fusion installations. The IAP has long term (~50 years) experience in the development and use of quasioptical (QO) and multi-mode systems. Basic principles were formulated in the 1960s–70s in papers of V.I.Talanov, M.I.Petelin, N.F. Kovalev, S.N.Vlasov: General features of QO beam propagation, integral equations (Maxwell, parabolic), scalings of similar solutions, G. G. Denisov (*) : A. V. Chirkov : V. I. Belousov : A. A. Bogdashov : G. I. Kalynova : D. I. Sobolev : Y. V. Rodin : S. Y. Kornishin : M. L. Kulygin : V. I. Malygin : V. V. Parshin : M. Y. Shmelev Institute of Applied Physics (IAP), RAS, Nizhny Novgorod, Russia e-mail: [email protected] E. M. Tai : E. A. Soluyanova GYCOM Ltd, Nizhny Novgorod, Russia V. I. Ilin Tokamak Physics Institute of RRC “Kurchatov Institute”, Moscow, Russia
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J Infrared Milli Terahz Waves (2011) 32:343–357
principles of mode selection, optimal transmission through apertures, rippled mode converters for multi-mode waveguides, QO converters of high-order modes into paraxial wave beams, and others. The components developed at IAP/GYCOM operate at frequencies in the range centimeter, millimeter and sub-millimeter wavelengths with different powers. For example, for ECW systems a typical frequency is in the range of 70–170 GHz and power per unit comparable with 1 MW in pulses of 0.1 ...1000 seconds. The microwave components often used here are: matching optics, barrier windows, directional couplers, switches, loads, waveguides, mirrors, polarizers, DC-breaks, mode filters, pumping ports, and bellows. Relativistic microwave electronics devices operate with power comparable with 1 GW in short pulses 1...100 ns. In contrast there ar
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