Design and Experiment of a Q-band Gyro-TWT Loaded With Lossy Dielectric

“…In another development, there has been a growing interest in millimeter wave gyro-TWTs [18][19][20][21][22][23][24][25][26][27][28][29][30][31], ranging from the Ku-band [29], Ka-band [19,[21][22][23]28], Q-band [24,26], W-band [18,20,25,30,31] to as high as 250 GHz [27]. These activities will also be highlighted along with a W band gyro-TWT's role in a state-of-the-art space radar [32].…”

Section: Gyro-twt Amplifiers and A Radar Applicationmentioning

confidence: 99%

Some recent progresses on electron cyclotron maser research

Chu

2015

2015 IEEE International Vacuum Electronics Conference (IVEC)

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Over a span of five decades, the electron cyclotron maser (ECM) has undergone a remarkably successful evolution from basic research to a poweiful millimeter, sub-millimeter, and THz wave generator called the gyrotron, while continuously being enriched by major advances. Below we discuss the ECM principle and its significance, followed by an overview of recent progresses made in two specific areas: THz gyrotron oscillators and millimeter-wave gyro-TWT ampltfiers. Topics �f the talk will include selected examples of device performances, ongoing/potential applications, and relevant physics issues.Each class of vacuum electronic devices is distinguishable by its characteristic bunching mechanism to convert an electron current from DC to AC. The ECM interaction [1][2][3][4] features a simple relativistic bunching mechanism. As shown in Fig. 1, in an applied DC magnetic field (Ba) andin the presence of a perpendicular RF electric field, the relativistic cyclotron frequency (Qc) decreases (increases) for energy-gaining (losing) electrons, which results in electron bunching along the cyclotron orbit. The ECM interaction takes place in a smooth fast-wave structure, as well as allowing the resonant excitation of a very high order mode (Fig. 2). It can thus generate output powers orders of magnitude greater than previously achievable. gain energy, eB � Q c = � azimuthal / bunching .

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“…Gyrotron traveling wave amplifiers (gyro-TWAs) have been proved to be very promising vacuum electronic sources in the microwave, millimeter, and terahertz wavelengths due to their high output power and broad operating bandwidth [1]. During the last several decades, different beam-wave interaction configurations for the gyro-TWAs have been explored, such as the dielectric loaded (DL) circuit [2][3][4][5][6], helically corrugated waveguide [7][8][9][10], confocal [11], and photonic band gaps waveguides [12]. Of all the beam-wave interaction configurations, high loss DL circuit has been widely used to design the gyro-TWA because of its merits of strong attenuation ability to parasitic modes, which allows the gyro-TWA operating with a very high gain [13,14].…”

Section: Introductionmentioning

confidence: 99%

Theory, Simulation and Millimeterwave Measurement of the Operating and Parasitic Modes in a High Loss Dielectric Loaded Gyrotron Traveling Wave Amplifier (Invited)

Wang¹,

Jiang²,

Yao³

et al. 2021

PIER C

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In the gyrotron traveling wave amplifier (gyro-TWA), high loss dielectric materials loaded in a cylindrical waveguide are adopted to suppress the unwanted parasitic oscillations. It is of great importance to accurately understand the relative permittivity r and tan δ for studying the microwave and millimeter wave dispersion, and loss properties of a specific mode. The high lossy dielectric loaded circuits of the gyro-TWAs made of the BeO-SiC ceramic are theoretical calculated, simulated, and measured. The field distribution, dispersion, and loss properties of three different dielectric loaded circular HE d 12 , HE d 22 , and TE d 02 modes (corresponding to the TE 11 , TE 21 , and TE 01 modes in the smooth hollow cylindrical waveguide respectively) in different frequency bands are respectively investigated. The theoretical analysis, simulation, and measurement results have a good agreement. This work has clear guiding significance for the stable work of gyro-TWAs.

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Design and Experiment of a Q-band Gyro-TWT Loaded With Lossy Dielectric

Cited by 67 publications

References 15 publications

Millimetre‐wave design and verification of a meta‐surface dielectric window made of polytetrafluoroethylene in Ka‐ and Q‐band

Millimetre‐wave design and verification of a meta‐surface dielectric window made of polytetrafluoroethylene in Ka‐ and Q‐band

Some recent progresses on electron cyclotron maser research

Theory, Simulation and Millimeterwave Measurement of the Operating and Parasitic Modes in a High Loss Dielectric Loaded Gyrotron Traveling Wave Amplifier (Invited)

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