Теорія та техніка антен (ICATT 2009). – 2009 р.
Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/3740
Матеріали 7-ої Міжнародної конференції
У книзі зібрано матеріали конференції, присвяченої проблемам у галузі розробки і впровадження антен.
Теорія та техніка антен = Antenna theory and techniques : матеріали 7-ої Міжнародної конференції, 9–12 червня 2009 року, Львів, Україна. – Львів : Видавництво Національного університету "Львівська політехніка", 2009. – 400 с. : іл.
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Item S-band planar strip array antennas without dielectric substrate(Видавництво Національного університету "Львівська політехніка", 2009) Martynyuk, S. Y.; Nazarenko, S. B.Novel designs of two S-band 4-elemnt (2×2) planar strip array antennas for wireless local area networks (WLAN) exploring the standard IEEE802.11b)g) are presented. The radiating elements of the proposed arrays are metal strip stacked patches, that allow to achieve frequency bandwidth more than 10%. The distinguishing feature of the designs is that strip arrays are air filled and completely free from using any dielectric substrates for holding the radiating patch elements. Manufactured prototypes of the arrays demonstrate good mechanical stability of proposed approach. Measured radiation patterns and frequency characteristic of VSWR are well agreed with theoretical models.Item Зміст до "Теорія та техніка антен"(Видавництво Національного університету "Львівська політехніка", 2009)We wish to thank the following contribution to the success of this conference.Item Enhanced transmission through below-cutoff holes and eigenoscillations of waveguide objects and periodical structures(Видавництво Національного університету "Львівська політехніка", 2009) Kirilenko, Anatoliy A.; Kolmakova (Don), Nataliya G.; Perov, Andrey O.The spectral theory is used to explain the enhanced transmission phenomenon. Eigenoscillations of corresponding waveguide and periodic open resonators have been studied. Their influence on frequency response is demonstrated for various structures. It has been found that the origin of this recently discovered effect is in the existence of the eigenoscillations of the interface between the free half-space and the metal half-space perforated with double-periodic set of channels or the eigenoscillations of the waveguide plane junction.Item Control of directional diagram of the inphase array for radiators of supershort radio impulses(Видавництво Національного університету "Львівська політехніка", 2009) Shostko, I. S.The method simultaneous excitation is considered of microwave oscillations in linear arrays of spark radiators. It is based on the voltage multiplication circuit’s usage. The influence is studied of the growing voltage along of antenna array and the switching time of dischargers in the array on performances of the directional diagram. The method of control directional diagram array is based on short-duration pulse shape properties. The beam direction depends on pulse radiators excitation parameters. The parameters experimental probing results are given for linear antenna array of spark radiators.Item Control of the radiation characteristics of a leaky-wave antenna by manipulation of the grating profile(Видавництво Національного університету "Львівська політехніка", 2009) Steshenko, S. O.; Kirilenko, A. A.A leaky-wave antenna consisting of a lamellar grating of finite extent fed by a planar dielectric waveguide is considered. The mathematical model of the antenna is improved for calculating of the apertures with large size. The possibilities of the radiation characteristics control by choosing of grating profile with linear variation of the groove depths are investigated.Item New method of graphic representation of electromagnetic fields structure(Видавництво Національного університету "Львівська політехніка", 2009) Gribanov, A. N.A method of visual graphic representation of an electromagnetic field structure, which consists in rectangular grid mapping of data calculated in a polar coordinate system, is proposed herein. As a result of the Maxwell differential equation solution, a formula is determined which allows mapping force lines of electrical component of the field radiated by a linear array in any space domain.Item Resonance near-field microwave diagnostics in dermatology(Видавництво Національного університету "Львівська політехніка", 2009) Kostrov, A. V.; Strikovskiy, A. V.; Yanin, D. V.; Smirnov, A. I.; Pantileeva, G. A.; Davoyan, Z. V.Resonance sensors for noninvasive express diagnostics of biological tissues are developed. The sensor operation is based on the method of near-field microwave sounding. The state of a tissue is estimated by its electrodynamic parameters (dielectric permittivity and conductivity). The capabilities (sensitivity, resolution, etc.) of the measuring systems employed for investigation of skin and differential diagnostics of various dermatoses.Item Direction of arrival estimation with sensor arrays(Видавництво Національного університету "Львівська політехніка", 2009) Czapska, J. M.; Yashchyshyn, Y.With recent increase of hardware capabilities, the application of sensor arrays in the Direction-Of-Arrival estimation is gaining more and more popularity. The behaviour of the array is the complex function of the geometry, sensor characteristic, signal and noise properties and other different factors. Before building the array it is essential to simulate its performance in different conditions with different algorithms. Most of the time the simulations are performed using custom ad-hoc created code. This code is error prone and difficult to maintain. Our goal was to create a reusable and extensible library that would provide the components used in the simulation process. In this paper we present the initial version of the library along with several illustrative examples.Item An effective approach to the fast, GPU-Based, Through-Wall imaging(Видавництво Національного університету "Львівська політехніка", 2009) Capozzoli, A.; Curcio, C.; D’Elia, G.; Iadarola, G.; Liseno, A.; Vinetti, P.We present an approach for the Through-Wall-Imaging based on a simple model of the scattering problem involving few unknowns, exploiting effectively the a priori information on the scenario and using a global optimization approach, relying on Legendre- Fenchel Transforms, tailored to fast, parallel implementations on Graphic Processing Units (GPUs). Experimental results are presented against X-band data collected in a realistic scenario made of a wall of Ytong concrete blocks and a metallic cylindrical scatterer.Item The new method of electronic scanning(Видавництво Національного університету "Львівська політехніка", 2009) Khludneva, A.; Mikhailov, M.; Paslyon, V.We investigate the possibility of using the reversing mediums in the antenna engineering that gives us the ability to improve characteristics of the antenna systems; particularly we can receive the adjusted form and width of the directional diagram in the microwave range and we can also command the directional diagram while scanning within the adjusted rule.