International Journal of Infrared and Millimeter Waves

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Investigation of the Dielectric-Loaded Folded Waveguide Traveling-Wave Tube Amplifier
International Journal of Infrared and Millimeter Waves - Tập 30 Số 10 - Trang 1027-1037 - 2009
Zhang, Changqing, Gong, Yubin, Gong, Huarong, Wei, Yanyu, Wang, Wenxiang
The cold-test characteristics of the dielectric-loaded folded waveguide traveling-wave tube (FWTWT) amplifier are investigated theoretically and the Pierce small-signal theory is employed to confirm the results. For the purpose of analysis, the discussions are separated into symmetric case and unsymmetrical case according to the loading form of the dielectrics. The calculation results indicate tha...... hiện toàn bộ
Study of coupling between circular groove guide and rectangular groove guide
International Journal of Infrared and Millimeter Waves - Tập 13 - Trang 933-938 - 1992
Ma Jianglei, Yang Hong-sheng, Lu Zhong-zou
On the basis of the studies of single circular groove guide and single rectangular groove guide, the coupling of the two waveguides has been researched and the characteristic equation of circular—rectangular groove guide has been given in this paper.
A New Piecewise Approach for Nonuniformity Correction in IRFPA
International Journal of Infrared and Millimeter Waves - Tập 25 - Trang 959-972 - 2004
Yan Shi, Tianxu Zhang, Zhiguo Cao
Considering different detector in IRFPA has different nonlinear response characteristic, a novel piecewise linear connection scheme for nonuniformity correction in IRFPA is proposed in this paper. Comparing to the widely used piecewise linear correction, the proposed scheme tries to find the n-segment piecewise straight-line which strives for going near (not always through) all available calibrati...... hiện toàn bộ
The Development of a Dual Channel SIS Receiver of Trao Telescope
International Journal of Infrared and Millimeter Waves - Tập 20 - Trang 2039-2047 - 1999
Jong-Ae Park, Seog-Tae Han, Tai-Seong Kim, Kwang-Dong Kim, Hyo-Ryong Kim, Hyun-Soo Chung, Se-Hyung Cho, Chang-Hoon Lee, Jongmann Yang
We developed a low noise dual channel receiver with 100GHz and 150GHz band, which is used to make the simultaneous observation with two bands. The SIS mixers are used in both bands. The constructed dewar for the receiver has a performance with a vacuum of 10−8torr and a temperature of 4.2K. The receiver noise temperature is 50K(DSB) for 100GHz band and 80K(DSB) for 150GHz band, respectively. In or...... hiện toàn bộ
Production of high quality Nb/Al-oxide/Nb SIS trilayers for submillimeter wave mixers
International Journal of Infrared and Millimeter Waves - Tập 18 - Trang 2177-2190 - 1997
E. E. Bloemhof
Owing to a very sharp nonlinearity in the quasiparticle currentvoltage characteristic, which fortuitously occurs on the scale of a few millivolts rather than a few volts as with semiconductor devices, superconductor/insulator/superconductor (SIS) tunnel junctions are the most sensitive detectors for heterodyne mixing at millimeter and submillimeter wavelengths. They can also provide sources of coh...... hiện toàn bộ
Instability of Two-stream Free-electron Laser with an Axial Guiding Magnetic Field
International Journal of Infrared and Millimeter Waves - Tập 27 - Trang 1073-1085 - 2006
Wenxin Liu, Ziqiang Yang, Zheng Liang
A model of two-stream Free-Electron Lasers (FEL) with an axial guiding magnetic field (AGMF) is proposed and investigated in this paper. The dispersion relation is derived employing linear fluid theory. The characteristics of dispersion relation are analyzed in detail by numerical solutions, which show that the growth rate can be considerably enhanced and the operation frequency is significantly b...... hiện toàn bộ
Quasioptical Transmission Lines for ECRH at TJ-II Stellarator
International Journal of Infrared and Millimeter Waves - Tập 21 - Trang 1945-1957 - 2000
Ángela Fernández, Konstantin M. Likin, Pedro Turullols, Jorge Teniente, Ramón Gonzalo, Carlos del Río, Javier Martí-Canales, Mario Sorolla, Romualdo Martín
Two mirror lines have been used to transmit the microwave power from the powerful microwave generators to the TJ-II plasmas. Both lines have been tested at nominal power level and they are in operation now. This paper deals with the final design of the transmission lines and their testing. Before starting operation at high power level, measurements of the wave beam parameters at low power level we...... hiện toàn bộ
Dual-Wavelength Pulse Train Generation Based on Silicon-on-Insulator Optical Waveguides
International Journal of Infrared and Millimeter Waves - Tập 31 - Trang 481-489 - 2009
Jianwei Wu, Haibo Bao
In this paper, we present and numerically study a method with pump-probe configuration to generate ∼4.17-THz dual-wavelength ultrahigh-repetition-rate pulse train from the continuous-waves (CW) based on the submicron silicon-on-insulator (SOI) optical waveguides. An original ∼4.17 THz repetition rate pulsed pump, with femtosecond pulse duration, at 2900 nm (mid-wave infrared wavelength-MWIR) and 2...... hiện toàn bộ
Experimental Examination of Gyrokinetics of Electron Cyclotron Maser
International Journal of Infrared and Millimeter Waves - Tập 19 - Trang 1343-1351 - 1998
Shi-Chang Zhang
In this paper the linear and quasi-linear kinetic theories of the electron cyclotron maser are introduced and experimantal examination is made. It is indicated that the transverse momentum spread of the electron beam has critical value; as it grows upto the critical value in the process of the beam-wave interaction, the electron cyclotron maser runs to saturation. Comparison shows good agreement b...... hiện toàn bộ
Generation of mm- and Sub mm-wave Bessel Beams Using DOE’s Designed by BOR-FDTD Method and MGA
International Journal of Infrared and Millimeter Waves - Tập 30 - Trang 172-182 - 2008
Y. Z. Yu, W. B. Dou
A new way for generating Bessel beams at mm and sub mm-wavelengths is presented in this paper, in which diffractive optical elements (DOE’s) are designed for converting incident Gaussian beams into Bessel beams. In order to reduce the computational burden and therefore improve the design efficiency, two measures are adopted in our design. One is a body-of-revolution finite-difference time-domain (...... hiện toàn bộ
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