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/content/aip/journal/adva/6/8/10.1063/1.4962150
1.
C. Baker, W.R. Tribe, T. Lo, B.E. Cole, S. Chandler, and M.C. Kemp, “People Screening using Terahertz Technology,” Proc. SPIE 5790, 110 (2005).
2.
A. Lewis, “A Review of Terahertz Sources,” J. Phys. D: Appl. Phys 47, 374001-1-11 (2014).
http://dx.doi.org/10.1088/0022-3727/47/37/374001
3.
B.A. Knyazev, G.N. Kulipanov, and N.A. Vinokurov, “Novosibirsk Terahertz Free Electron Laser: Instrumentation Development and Experimental Achievements,” Meas. Sci. Technol. 21, 054017-1-13 (2010).
http://dx.doi.org/10.1088/0957-0233/21/5/054017
4.
M.Yu. Glyavin, G.G. Denisov, V.E. Zapevalov, A.N. Kuftin, A.G. Luchinin, V.N. Manuilov, M.V. Morozkin, A.S. Sedov, and A.V. Chirkov, “Terahertz Gyrotrons: State of the Art and Prospects,” J. Commun. Technol. El. 59, 792797 (2014).
http://dx.doi.org/10.1134/S1064226914080075
5.
J. Benford, J.A. Swegle, and E. Schamiloglu, High Power Microwaves, 3rd ed. (CRC Press, Boca Raton, FL, 2016).
6.
A.M. Elfrgani, “Relativitic Backward Wave Oscillator with a Gaussian Radiation Pattern and Related Technologies,” Ph.D. Dissertation, Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, 2015.
7.
A.A. El’chaninov, A.I. Klimov, O.B. Koval’chuk, G.A. Mesyats, I.V. Pegel, I.V. Romanchenko, V.V. Rostov, K.A. Sharypov, and M.I. Yalandin, “Coherent Summation of Power of Nanosecond Relativistic Microwave Oscillators,” Tech. Phys. 56, 121126 (2011).
http://dx.doi.org/10.1134/S1063784211010099
8.
V.V. Rostov, A.A. El’chaninov, I.V. Romanchenko, and M.I. Yalandin, “A Coherent Two-Channel Source of Cherenkov Superradiance Pulses,” Appl. Phys. Lett. 100, 224102-1-4 (2012).
http://dx.doi.org/10.1063/1.4723845
9.
M.I. Yalandin, S.A. Shunailov, M.R. Ul’maskulov, K.A. Sharypov, V.G. Shpak, V.V. Rostov, I.V. Romanchenko, A.A. El’chaninov, and A.I. Klimov, “Synphase Operation of Nanosecond Relativistic 37-GHz Backward-Wave Oscillators without Electrodynamic Coupling,” Tech. Phys. 38, 917920 (2012).
http://dx.doi.org/10.1134/S1063785012100264
10.
Q. Xue, K.J. Song, and C.H. Chan, “China: Power Combiners/Dividers,” IEEE Microwave Magazine, no. 5, 96–106 (May 2011).
11.
N.S. Ginzburg, A.W. Cross, A.A. Golovanov, G.A. Mesyats, M.S. Pedos, A.D.R. Phelps, I.V. Romanchenko, V.V. Rostov, S.N. Rukin, K.A. Sharypov, V.G. Shpak, S.A. Shunailov, M.R. Ulmaskulov, M.I. Yalandin, and I.V. Zotova, “Generation of Electromagnetic Fields of Extremely High Intensity by Coherent Summation of Cherenkov Superradiance Pulses,” Phys. Rev. Lett. 115, 114802-1-5 (2015).
http://dx.doi.org/10.1103/PhysRevLett.115.114802
12.
D. V. Pozar, “Transmission Lines and Waveguides,” Microwave Engineering, 4th ed. (John Wiley and Sons: Hoboken, New Jersey, USA).
13.
Y.T. Lo and S.W. Lee, Antenna Handbook: Antenna Theory (Van Nostrand Reinhold Co, New York, NY, 1988).
14.
B.Z. Katsenelenbaum, L. Mercader del Rio, M. Pereyaslavets, M. Sorolla Ayza, and M. Thumm, “Theory of Nonuniform Waveguides: The Cross-Section Method,” The Institution of Engineering and Technology: Edison, NJ, USA.
15.
E.B. Abubakirov, M.I. Fuks, and N.F. Kovalev, “High-Selectivity Resonator For Powerful Microwave,” Proc. BEAM’s-96 1, 410413Prague, Czech Republic (1996).
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/content/aip/journal/adva/6/8/10.1063/1.4962150
2016-08-29
2016-12-10

Abstract

Most dangerous explosive materials, both toxic and radioactive, contain nitrogen salts with resonant absorption lines in the frequency range 0.3-10 THz. Therefore, there has been growing interest in remotely detecting such materials by observing the spectrum of reflected signals when the suspicious material is interrogated by THz radiation. Practical portable THz sources available today generate only 20–40 mW output power. This power level is too low to interrogate suspicious material from a safe distance, especially if the material is concealed. Hence, there is a need for sources that can provide greater power in the THz spectrum. Generating and extracting high output power from THz sources is complicated and inefficient. The efficiency of vacuum electronic microwave sources is very low when scaled to the THz range and THz sources based on scaling down semiconductor laser sources have low efficiency as well, resulting in the well known “THz gap.” The reason for such low efficiencies for both source types is material losses in the THz band. In this article an efficient power combiner is described that is based on scaling to higher frequencies a microwave combiner that increases the output power in the THz range of interest in simulation studies. The proposed power combiner not only combines the THz power output from several sources, but can also form a Gaussian wavebeam output. A minimum conversion efficiency of 89% with cophased inputs in a lossy copper power combiner and maximum efficiency of 100% in a Perfect Electric Conductor (PEC)-made power combiner were achieved in simulations. Also, it is shown that the TE output mode is a reasonable option for THz applications due to the fact that conductive loss decreases for this mode as frequency increases.

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