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| Знайдено в інших БД: | Реферативна база даних (4) |
Список видань за алфавітом назв: Авторський покажчик Покажчик назв публікацій  |
Пошуковий запит: (<.>A=Dubrovka F$<.>) | |||
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Загальна кількість знайдених документів : 2 Представлено документи з 1 до 2 |
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| 1. | 
Dubrovka F. F. Boundary problem solution for eigenmodes in coaxial quad-ridged waveguides [Електронний ресурс] / F. F. Dubrovka, S. I. Piltyay // Information and telecommunication sciences. - 2014. - Vol. 1, no. 1. - С. 48-61. - Режим доступу: http://nbuv.gov.ua/UJRN/Telnau_2014_1_1_10 The boundary problem for eigenmodes in coaxial quad-ridged waveguides has been solved by the transverse field-matching technique. The formulas obtained provide possibilities to calculate cutoff wave numbers and electric and magnetic fields distributions of TEM, TE and TM modes in the presence of the ridges either on the inner or on the outer perfectly conducting cylinder. The analysis of the dependences of cutoff wave numbers and electric field distributions convergences on the number of partial modes has been carried out. It has been shown that for calculation of cutoff wave numbers with residual error less than 0,1 % it is enough to utilize 27 partial modes, and for the correct calculation of fields distributions one should utilize more than 30 partial modes. | ||
| 2. |
Dubrovka F. F. Wideband matching the dual frequency coaxial waveguide feed [Електронний ресурс] / F. F. Dubrovka, Yu. A. Ovsianyk, P. Ya. Stepanenko, O. S. Zakharchenko // Telecommunication sciences. - 2012. - Vol. 3, no. 2. - С. 53-60. - Режим доступу: http://nbuv.gov.ua/UJRN/Telnau_2012_3_2_9 An effective technique to the design of dual band coaxial waveguide feed horn for reflector antenna excitation has been developed and tested. Matching the feed horn with free space in upper frequency range is achieved by dielectric insert disposed inside the circular waveguide fabricated in interior conductor of open ended coaxial waveguide. The presence of dielectric insert causes the high level of reflection in lower frequency range from the boundary between the open end of coaxial waveguide and free space. A novel technical solution of highly complicated matching problem has been proposed. The matching design was performed as the series of finite thickness diaphragm arranged on outer surface of interior conductor of coaxial waveguide. To obtain the rigorous solution of given electromagnetic problem for the complicated structure consisting of a great number of connected coaxial waveguide sections and dielectric insert, a new effective approach has been proposed. The distinctive feature of this approach consists in combination of rigorous procedure based on computation of generalized scattering matrices and another rigorous procedure based on the finite difference time domain method. To combine these essentially different approaches, the metallic discontinuity equivalent to overall investigated structure was employed. An optimization of equivalent matching structure has been performed by the variant of the evolution strategy method. The obtained design with metallic discontinuities was converted into real structure comprising the dielectric insert. The final calculations of real structure were performed by the finite difference time domain methods. The effectiveness of proposed technique was confirmed by the results of testing the developed feed horn in reflector antenna system. | ||
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