Simulating a wavelength-size 2-D lens with an accurate numerical method

The effect of a localized light source directivity improvement due to an arbitrarily shaped dielectric cylinder taken as a 2-D model of a dielectric lens is studied. The source is simulated by the field of a complex source-point (CSP). An efficient algorithm for the solution of 2-D problem of wave scattering by a smooth dielectric cylinder is developed, based on the concept of analytical regularization. The basic properties of the algorithm are studied. Numerical results for the accuracy of the algorithm and sample far-field characteristics such as the total radiated power, directivity and radiation patterns for various lens parameters are presented. © 2001 IEEE

Resonance lens antenna analysis for MM-wave applications

We report what is to our knowledge the first accurate theoretical investigation of the electromagnetic behavior of 2-D elliptical lenses of finite wavelength-scale size. The role of internal resonances in the focal domain formation is studied. A proposal of a narrow-band receiver based on a hemielliptic lens tuned to a resonance is discussed. Possible features of such a lens-coupled receiver are stability of the resonance field with respect to the angle of arrival of incident wave and several times greater values of the peak field intensity that may potentially lead to higher sensitivity and better scanning performance. In the analysis, we use the Muller boundary integral equation (BIE) technique. This full-wave mathematically rigorous method is combined with trigonometric Galerkin discretization to result in the efficient numerical solution for an arbitrary set of the electrical, geometrical, and material parameters. Numerical results are generated for a quartz elliptical lens (ε= 3.8) with dimensions typical to mm-wave radar applications. Near field analysis, lens-focusing properties and lens frequency-dependent performance are presented

Lens or resonator? Electromagnetic behavior of an extended hemielliptic lens for a sub-millimeter-wave receiver

The behavior of a 2D model of an extended hemielliptic silicon lens of a size typical for THz applications is accurately studied for the case of a plane E-wave illumination. The full-wave analysis of the scattering problem is based on the Mutter's boundary integral-equations (MB1E) that are uniquely solvable. A Calerkin discretization scheme with a trigonometric basis leads tu a very efficient numerical algorithm. The numerical results related to the focusability of the lens versus its rear-side extension and the angle of the plane-wave incidence, as well as near-field profiles, demonstrate strong resonances. Such effects can change the principles of optimal design of lens-based receivers. © 2004 Wiley Periodicals, Inc

Temperature control system of two section electron LINAC-40

The temperature control system of the accelerator provides thermal stabilization of the two accelerating sections and the injector. The system consists of 7 temperature-sensitive elements, up to 8 transducers of water flow through the objects being cooled and the detector of the water level in the tank. The microprocessor complex ADAM 5511 and the commercial thyristor controllers are used for analysis of signals from the transducers and for temperature control. Information of the process parameters is displayed on the local control desk, as well as, via the RS-485 port is transferred to the accelerator control room.Система термостатирования ускорителя ЛУЭ-40, обеспечивает термостабилизацию двух ускоряющих секций и инжектора. В системе термостатирования имеется 7 датчиков измерения температуры, до 8 датчиков протока воды через охлаждаемые объекты и датчик уровня воды в баке. Для анализа сигналов от датчиков и регулирования температуры используется микропроцессорный комплекс АДАМ 5511 и тиристорные регуляторы РОТ-63. Информация о параметрах процессов выдается на местный пульт управления, а также через порт RS-485 в РС оператора ускорителя.Система термостатування прискорювача ЛПЕ-40, забезпечує термостабілізацію двох прискорюючих секцій та інжектора. У системі термостатування є 7 датчиків вимірювання температури, до 8 датчиків протоку води крізь охолоджувані об’єкти та датчик рівня води у баці. Для аналізу сигналів від датчиків та регулювання температури використовується мікропроцесорний комплекс АДАМ 5511 та тиристорні регулятори РОТ-63. Інформація о параметрах процесів видається на локальний пульт управління, а також через порт RS-485 у РС оператора прискорювача

Aperture antennas for millimeter and sub-millimeter wave applications

International audienc

Near fields of elliptic dielectric lenses

The focusing properties of an elliptic dielectric cylinder taken as a 2D model of dielectric lens are studied for the plane wave illumination. An algorithm based on the concept of analytical regularization is applied for the numerical solution of the corresponding wave scattering problem. Numerical results for the near-field patterns are presented

Integrated lens antennas

International audienceThis chapter presents the Integrated Lens Antenna (ILA) technology as it evolved since its introduction aiming to respond to the needs of emerging applications such as high-data-rate communication, intelligent transport, and mm-wave imaging. The topics covered include the ILA design concepts as well as the electromagnetic phenomena intrinsic to dielectric lenses that may affect ILA performance. The aspects of the ILA technology related to selection of the primary feeds, lens materials, and fabrication methods are also revised. A few practical examples are provided to illustrate the current and future trends of this technology. © Springer International Publishing AG 2018

Improvement of the Scanning Performance of the Extended Hemispherical Integrated Lens Antenna Using a Double Lens Focusing System

International audienceWe demonstrate that an integrated lens antenna (ILA) with a double lens (DL) focusing system can provide simultaneously a high broadside directivity and a low scan loss over a wide angular range. The proposed DL ILA system consists of a hemispherical substrate lens and a planoconvex objective lens. A prototype of a high-gain DL ILA with lenses made of a low permittivity dielectric material is fabricated and characterized in the frequency range of 75-79 GHz. The realized scan loss in terms of gain within a ±30° field of view is <1.1 dB in both planes. The performance of the DL ILA is compared with that of two hemispherical ILAs designed to provide the best broadside directivity and the lowest scan loss, respectively. © 2016 IEEE