Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
72
5
2013
GENERALIZED MODE-MATCHING TECHNIQUE IN THE THEORY OF GUIDED WAVE DIFFRACTION. PART 1: FRESNEL FORMULAS FOR SCATTERING OPERATORS
369-384
10.1615/TelecomRadEng.v72.i5.10
I. V.
Petrusenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine; University of Customs Affair and Finances, 8, Rogaleva St., Dnepropetrovsk 49000, Ukraine
Yuriy
Sirenko
IRE NAN Ukraine
mode-matching technique
Cayley transformation
Fresnel formulas
scattering operator
A generalization of the conventional mode-matching technique corresponding to a new formulation of the problem of wave diffraction by waveguide discontinuities is presented. The matrix-operator formalism used in the study for the modal analysis is briefly described. Fresnel formulas are derived for the sought-for operators of mode reflection and transmission in the canonical problem of step discontinuity in the guide. The correctness of the found matrix-operator model is proved analytically. It is shown that the obtained results are valid for a wide class of scalar problems of wave diffraction by step-like discontinuities in the waveguide. The developed generalization of the mode-matching technique is intended for efficient and rigorous analysis of waveguide units and microwave devices.
TWO-DIMENSIONALLY PERIODIC GRATINGS. PART 3: ELEMENTS OF THE SPECTRAL THEORY
385-392
10.1615/TelecomRadEng.v72.i5.20
L. G.
Velychko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A.A.
Kryvchikova
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
Yuriy
Sirenko
IRE NAN Ukraine
three-dimensionally periodic grating
the canonical Green function
point spectrum
uniqueness theorem
The results are presented which are necessary for development of a spectral theory of 3D periodic structures. An analytical representation has been obtained for the canonical Green function and natural variation range for the spectral parameter (complex-valued frequency) has been determined in the form of an infinite-sheeted Riemann surface. Some statements have been formulated which allow estimating the range of localization of the spectral set elements.
ELECTROMAGNETIC WAVE DIFFRACTION BY STRIP-BASED STRUCTURES: FAR AND NEAR FIELDS
393-405
10.1615/TelecomRadEng.v72.i5.30
S. N.
Vorobyov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Mystetstv St., Kharkiv 61002, Ukraine
diffraction
electromagnetic field
the Fourier integral
near- and far-field zones
The near and far scattered fields and their Fourier amplitudes are analyzed numerically for three structures of metal strips consisting, respectively, of a single, two and infinite number of plane strips. The correspondence between the amplitude and phase of the scattered field, and also its Fourier amplitude has been established for the case of the diffraction of a plane H-polarized wave. Physical features of the scattered field are considered.
USING NESTED SEMI-MARKOV PROCESSES FOR DESCRIPTION OF NON-STATIONARY SIGNALS AND FIELDS
407-419
10.1615/TelecomRadEng.v72.i5.40
V. I.
Lutsenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
I. V.
Lutsenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
S. A.
Masalov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
Stanislav I.
Khomenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
non-stationary signals and processes
backscattering
refraction coefficient
enclosed processes
compact function
A possibility of using the embedded semi-Markov processes to create statistical models of the signals reflected from the interfaces (land and sea), as well as parts of "clear" sky was considered. Their constituent parameters were determined based on the experimental data. It is shown that non-stationary season changes in the refractive index of the troposphere can be accounted for describing its statistics by the poly-Gaussian models. Model parameters for each of the seasons were derived experimentally. The proposed approach can be used to create a simulation model of behavior of the refractive index using the nested semi-Markov processes.
POWER CHARACTERISTICS OF MULTIFREQUENCY MILLIMETER AND SUBMILLIMETER WAVE SELF-OSCILLATORS BASED ON THE pn-i-pn STRUCTURES
421-434
10.1615/TelecomRadEng.v72.i5.50
K. A.
Lukin
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
P. P.
Maksymov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
semiconductor pn-i-pn structure
impact ionization
multifrequency self-oscillators
useful power density
electronic efficiency
Power characteristics are analyzed of mulifrequency millimeter and submillimeter wave self-oscillators on the basis of Si and GaAs dc reverse-biased pn−i−pn structures with abrupt p-n junctions. Mathematically, self-oscillators are described by drift-diffusion model equations for semiconductors. An algorithm is suggested for solving difference equations of the mathematical model. The volt-ampere characteristics of the pn−i−pn structures are analyzed. The dynamics in the distributions of the electric field, electric potential and total charge of mobile carriers and impurity atoms in the pn−i−pn structure is investigated. The Fourier spectrum of the useful power density and the electronic efficiency of the multifrequency self-oscillators are calculated.
RESEARCH OF NEW SOLID-STATE LASANT MEDIA ON THE BASIS OF INDUSTRIAL POLYURETHANE COMPOUNDS, ACTIVATED BY DYES
434-445
10.1615/TelecomRadEng.v72.i5.60
S. V.
Nikolaev
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. V.
Pozhar
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
M. I.
Dzyubenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine; Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
solid-state dye laser
polyurethane matrix
transverse pumping
New lasant media on the basis of industrial polyurethane systems T-809/T-863, T-813/T-863 (Italy) and EU-29-1/HU-29-1 (Taiwan), activated by several Rhodamine and oxazine laser dyes have been created and investigated. Optical characteristics of these polyurethane compounds have been analyzed, their compatibility with different dyes is determined and spectroluminescent characteristics of the received media have been investigated. Experimental samples of laser matrices on the basis of chosen polyurethanes were made and their lasing ability was investigated. Laser radiation of microsecond duration from matrixes based on T-809/T-863, T-813/T-863 compounds, activated by Rhodamine 6G, Sulforhodamine 101, Oxazine 17 and Oxazine 1 was received. It is established that the power efficiency of laser radiation depends on optical quality of the produced samples.
ASYMPTOTIC EXPANSION IN THE NONLINEAR THEORY OF ELECTRONIC BEAM MICROWAVE TWT-M DEVICES
447-460
10.1615/TelecomRadEng.v72.i5.70
G. A.
Alexeev
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
beam M-type devices
nonlinear theory
analytical solution
TWT-M
frequency multiplication
A method of constructing approximate analytical solutions to a nonlinear problem in the theory of TWT-M and BWT-M using asymptotic estimates of integral members in the equations for the HF-field amplitude and a counter expansion method are proposed. The method is developed as applicable to the TWT-M devices with taking into account the HF-energy ohmic losses and the electron kinetic energy variations in the process of interaction. An accuracy of the method is 5−10 % on different segments of the HF-signal distribution curve. Of a particular interest is the analytical investigation into multiplication properties of M-type beam devices. A possibility of creating a high performance single-section multiplier based upon the TWT-M is evidenced.