Design and Analysis of a High-Order Mode Ladder-Type RF Circuit for Stable Operation in a &lt;inline-formula&gt; 
                     &lt;tex-math notation="LaTeX"&gt;${W}$ &lt;/tex-math&gt;
                  &lt;/inline-formula&gt;-Band Extended Interaction Oscillator

Bi, Liangjie; Meng, Lin; Yin, Yong; Xu, Che; Zhu, Sairong; Peng, Ruibin; Zeng, Fanbo; Chang, Zhiwei; Wang, Bin; Li, Hailong; Zhang, Ping

doi:10.1109/ted.2018.2882956

Cited by 36 publications

(7 citation statements)

References 17 publications

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“…The axial mode was chosen as 2π mode as it provided equal direction to the electric field at each gap for enhanced modulation of the electron beam [40]. Established beam-wave interaction theory shows that the electron beam interacts with the E z component of the electric field [15]. Therefore, the transverse mode is termed TM n,1 , where the index n is determined by the variation in the distribution pattern of the axial electric field along the transverse direction.…”

Section: 1 Thz Five-sheet Beam High-order Mode Interaction Circuitmentioning

confidence: 99%

“…A solution for operating the circuit in high-order mode is adopted to overcome the frequency limitation and output power restriction caused by the small size of the HF system. In contrast to the fundamental mode commonly used, a high-order mode can support a larger-sized HF system for a given frequency [15]. However, multiple modes coexist in a large-sized HF system.…”

Section: Introductionmentioning

confidence: 99%

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Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Yuan

et al. 2019

Nanomaterials

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Carbon nanotube (CNT) cold cathodes are proving to be compelling candidates for miniaturized terahertz (THz) vacuum electronic devices (VEDs) owning to their superior field-emission (FE) characteristics. Here, we report on the development of a multi-sheet beam CNT cold cathode electron optical system with concurrently high beam current and high current density. The microscopic FE characteristics of the CNT film emitter is captured through the development of an empirically derived macroscopic simulation model which is used to provide representative emission performance. Through parametrically optimized macroscale simulations, a five-sheet-beam triode electron gun has been designed, and has been shown to emit up to 95 mA at 3.2 kV. Through careful engineering of the electron gun geometric parameters, a low-voltage compact THz radiation source operating in high-order TM 5 , 1 mode is investigated to improve output power and suppress mode competition. Particle in cell (PIC) simulations show the average output power is 33 W at 0.1 THz, and the beam–wave interaction efficiency is approximately 10%.

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Section: 1 Thz Five-sheet Beam High-order Mode Interaction Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Yuan

et al. 2019

Nanomaterials

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“…The applications of such devices include particle accelerators, industrial and plasma heating, RADARs and active denial technologies, deep space communication, etc. [24][25][26][27][28]. A number of amplifiers and oscillators operating in the Ka-Band and other higher-frequency bands employing multiple beams and extended interaction structures are being explored globally [19,[29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Design of the Radio Frequency Section of a Ka-Band Multiple Beam Ladder-Type Extended Interaction Klystron

et al. 2022

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Ka-band frequencies are becoming increasingly popular due to their application potential in high-data-rate wireless communications relevant to 5G applications, satellite link establishment, etc. High-power amplifiers in this frequency band, offering several tens of watts of output RF power, are one of the main enabling components of these communication systems. This article reports the design studies and analysis of the radio frequency (RF) section of a multiple beam-extended interaction klystron (MB-EIK). The proposed multiple beam RF section with a ladder-type EIK structure offers several crucial features, such as a low-voltage operation, moderate operational bandwidth, and high output power. Starting from the design of the intermediate cavities, the input and output sections and the overall RF section are presented. The proposed RF section supports the operation at 28.5 GHz center frequency with about a 500 MHz 3 dB bandwidth employing four electron beams with a 4 kV DC accelerating field.

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“…In [20,21], the TM 31 mode in the transverse mode sequence of TM n1 , which is according to the nomenclature based on the number of half wavelength (n) across the cross section of the resonant system, was applied in Y-band EIKs to construct the resonant systems with large cross section for increasing power capacity. We also pursued to define a design procedure of the TM 31 mode for supporting the overmoded extended interaction oscillators [22][23][24][25]. However in all of these references, the researching subjects are the EIKs with pencil beam.…”

mentioning

confidence: 99%

“…We reported that the equivalent shorts can be built up inside the resonant system to divide the field energy into three sections, which become TM 31 mode [22][23][24][25]. The typical cut-off extended interaction TM 11 field is assumed to be distributed in the space between the shorts at the outer walls represented by y 1 and y 2 location, as shown in figure 1(a).…”

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confidence: 99%

Three-dimensional electromagnetic characteristic of overmoded coupling pattern for the cut-off extended interaction field in THz sheet beam resonant system

Meng

Gong

et al. 2020

J. Phys. D: Appl. Phys.

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The concept of overmoded coupling pattern for matching with the cut-off resonant condition in a THz sheet beam resonant system is proposed to build up super double-overmoded extended interaction field for high power THz radiation. A physical design procedure is proposed to support the matched overmoded coupling pattern. The three-dimensional electromagnetic characteristic of the super overmoded field is studied to demonstrate the effectiveness of the procedure for clarifying the relationship between the overmoded coupling pattern and cut-off resonant condition. This relationship is analyzed by focusing on (1) the distribution characteristic of the overmoded coupling pattern associated with the specific boundaries inside the structure, (2) the equivalent method for describing the interaction impedance in sheet beam system, (3) magnitude of the internal field strength, and (4) variation of the ohmic loss. The simulation results show the typical cut-off resonant condition can be established and maintained with same distribution pattern and same frequency, as in the case of the systems with the proposed overmoded coupling pattern and without it. Multiple sections of coupling patterns, which are distributed arbitrarily in coupling cavities, also have no effect on the cut-off condition only if they are based on the design procedure. The important fact is that the introduction of the proposed overmoded coupling pattern has the capability of reducing the ohmic loss and mitigating the strong field density inside the systems. This is significant for developing high power THz radiation.

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Design and Analysis of a High-Order Mode Ladder-Type RF Circuit for Stable Operation in a <inline-formula> <tex-math notation="LaTeX">${W}$ </tex-math> </inline-formula>-Band Extended Interaction Oscillator

Cited by 36 publications

References 17 publications

Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Design of the Radio Frequency Section of a Ka-Band Multiple Beam Ladder-Type Extended Interaction Klystron

Three-dimensional electromagnetic characteristic of overmoded coupling pattern for the cut-off extended interaction field in THz sheet beam resonant system

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