Ultrawideband Millimeter-Wave Oscillators Based on Two Coupled Gyro-TWTs With Helical Waveguide

Денисов, Г. Г.; Vilkov, M. N.; Zotova, I. V.; Sergeev, A. S.; Rozental, R. M.; Самсонов, С. В.; Mishakin, S. V.; Marek, Alexander; Jelonnek, John

doi:10.1109/ted.2018.2801021

Cited by 7 publications

(6 citation statements)

References 22 publications

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“…For the passive mode locked pulsed oscillator in the millimeter frequency range considered so far, only operation in soft excitation is planned. But as shown in [10], the highest pulse-to-pulse reproducibility is achieved in the hard excitation regime. Thanks to the extended feedback system, operation with hard excitation would be possible in principle (see Fig.…”

Section: Feedback System For a Passive Mode Locked Pulsed Oscillatormentioning

confidence: 90%

“…Although, strictly speaking, the Jones calculus is only valid for monochromatic waves, it allows an easy inclusion of the feedback system into interaction simulations based on the slowly varying amplitude approach (SVAA). The SVAA is common for the simulation of the electron-wave interactions in electron tubes and has been successfully used for first simulations of devices coupled in a feedback loop [10]. However, so far only simulations assuming a perfect feedback system have been performed.…”

Section: Jones Calculusmentioning

confidence: 99%

“…Particularly challenging is the demand for high bandwidth at high power. Promising technologies for both the amplifier and the absorber are gyrotron traveling-wave tubes (gyro-TWTs) with a helical interaction circuit [9], [10], [11]. This type of vacuum electron tubes provide a series of advantages compared to classical gyro-TWTs based on cylindrical interaction waveguides with dielectric losses [12], [13].…”

Section: Introductionmentioning

confidence: 99%

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Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Marek

Avramidis

Illy

et al. 2020

IEEE Trans. Electron Devices

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A new type of high-power pulsed source in the millimeter and sub-millimeter frequency range, utilizing the method of passive mode locking, was proposed in 2015 by the Institute of Applied Physics (IAP-RAS) in Nizhny Novgorod. This principle, well known from laser physics, allows the generation of a periodic series of powerful, coherent, ultra-short pulses. In the millimeter and sub-millimeter wavelength range this can be realized using an amplifier and a saturable absorber coupled in a feedback loop. For the coupling of the two devices, a sophisticated feedback system is required. Such a system, based on simple overmoded waveguide components, was previously proposed by the authors. The present article shows how the proposed feedback system can be extended, allowing for a wide range of possible operation regimes for two coupled gyro-devices. Particularly noteworthy is the application of the modified feedback system for the realization of a two-stage amplifier in the sub-THz range. Furthermore, it seems to be possible to use two helical gyrodevices coupled in the proposed way as a source of coherent pulses, as a free-running or locked CW source, and as a twostage amplifier. In all cases, no design changes of the feedback system are required. Index Terms-sub-THz, high power, ultra-short pulses, passive mode locking, feedback system, quasi-optical.

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Section: Feedback System For a Passive Mode Locked Pulsed Oscillatormentioning

confidence: 90%

Section: Jones Calculusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Marek

Avramidis

Illy

et al. 2020

IEEE Trans. Electron Devices

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“…In the following, simulations of an absorber as suggested in [8] for a feedback loop at a center frequency of 30 GHz are performed. The suggested feedback loop is designed to provide pulses with a peak-power up to 400 kW and a width of only 0.25 ns by a separation of 5-10 ns [8]. The absorber has a mean waveguide radius of 0.4 cm with a corrugation of amplitude 0.1 cm and a period of 1.0 cm.…”

Section: Simulationsmentioning

confidence: 99%

Contributions to the Joint DFG-RSF Project - Generation of Ultra-Short Microwave Pulses -

et al. 2018

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“…The greatest advantage of this is that it greatly reduces the requirement of operating magnetic field intensity. The PIC simulations predict the maximum output power of 3 kW at about 95 GHz and a 1-kW-level bandwidth of 7.2 GHz when driving by a 100 mW input signal [14][15][16][17][18]. In China, research on W-band gyro-TWTs has been receiving more and more attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Design and Preliminary Experiment of W-Band Broadband TE02 Mode Gyro-TWT

Xu¹,

Liu³

et al. 2021

Electronics

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The gyrotron travelling wave tube (gyro-TWT) is an ideal high-power, broadband vacuum electron amplifier in millimeter and sub-millimeter wave bands. It can be applied as the source of the imaging radar to improve the resolution and operating range. To satisfy the requirements of the W-band high-resolution imaging radar, the design and the experimentation of the W-band broadband TE02 mode gyro-TWT were carried out. In this paper, the designs of the key components of the vacuum tube are introduced, including the interaction area, electron optical system, and transmission system. The experimental results show that when the duty ratio is 1%, the output power is above 60 kW with a bandwidth of 8 GHz, and the saturated gain is above 32 dB. In addition, parasitic mode oscillations were observed in the experiment, which limited the increase in duty ratio and caused the measured gains to be much lower than the simulation results. For this phenomenon, the reasons and the suppression methods are under study.

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Ultrawideband Millimeter-Wave Oscillators Based on Two Coupled Gyro-TWTs With Helical Waveguide

Cited by 7 publications

References 22 publications

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Extended Feedback System for Coupled Sub-THz Gyro-Devices to Provide New Regimes of Operation

Contributions to the Joint DFG-RSF Project - Generation of Ultra-Short Microwave Pulses -

Design and Preliminary Experiment of W-Band Broadband TE02 Mode Gyro-TWT

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