Xem 1-20 trên 362 kết quả Antenna
  • After providing the basic background in electromagnetic theory necessary to utilize the software, the author of Ebook Antenna and EM Modeling with Matlab describes the benefits and many practical uses of the Matlab. Sergey Makarov's text utilizes the widely used Matlab(r) software, which offers a more flexible and affordable alternative to other antenna and electromagnetic modeling tools currently available.

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  • The third editionof Antenna Theory is designed to meet the needs of electrical engineering and physics students at the senior undergraduate and beginning graduate levels, and those of practicing engineers.

    pdf1073p oruku2009 13-11-2013 92 27   Download

  • Textbooks on radio antennas and propagation have changed little over the last 50 years. Invariably they base themselves on the famous electromagnetic equations described by James Clerk Max- well, a great nineteenth-century genius of theoretical physics (Torrance, 1982). Maxwell's equations brilliantly encompassed all the electromagnetic phenomena known by his time (except photo- electric long-wave cut-off, which remained ...

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  • In the last 40 years, the microstrip antenna has been developed for many communication systems such as radars, sensors, wireless, satellite, broadcasting, ultra-wideband, radio frequency identifications (RFIDs), reader devices etc. The progress in modern wireless communication systems has dramatically increased the demand for microstrip antennas. In this book some recent advances in microstrip antennas are presented.

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  • As the growing demand formobile communications is constantly increasing, the need for better coverage, improved capacity and higher transmission quality rises. Thus, a more efficient use of the radio spectrum is required. Smart antenna systems are capable of efficiently utilizing the radio spectrum and, thus, is a promise for an effective solution to the present wireless systems’ problems while achieving reliable and robust high-speed high-data-rate transmission. The purpose of this book is to provide the reader a broad viewof the systemaspects of smart antennas.

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  • Kết hợp nhiều anten đơn lẻ thành một hệ thống bức xạ. Mục đích của việc này nhằm cải thiện đồ thị bức xạ, tăng độ định hướng. Trong chương này sẽ trình bày những nội dung và hình ảnh chi tiết về hệ thống bức xạ (Array Antennas), mời các bạn cùng tham khảo để nắm bắt chi tiết.

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  • dipole antenna is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other (in line with each other), with a small space between them. The radio frequency voltage is applied to the antenna at the center, between the two conductors. These antennas are the simplest practical antennas from a theoretical point of view.

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  • The book addresses practical engineering issues that antenna professionals have to deal with. It explains the immediate demands for existing systems; discusses the antenna technology for the latest and emerging applications, and gives comprehensive coverage of hot topics in the wireless industry. Issues including design considerations, engineering design, measurement setup and methodology, and practical applications are all covered in depth.

    pdf307p ken333 06-07-2012 43 6   Download

  • Most antenna engineers are likely to believe that antennas are one technology that is more or less impervious to the rapidly advancing semiconductor industry. However, as demonstrated in this lecture, there is a way to incorporate active components into an antenna and transform it into a new kind of radiating structure that can take advantage of the latest advances in analog circuit design

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  • The research, simulation and design dual band antenna which operates at 900MHz and 2.45GHz are conducted. FR4-epoxy substrate is chosen with thickness h = 1.5mm, εr = 4.4. Dual band can be achieved by using different methods of impedance’s matching for single antenna which is originally designed at 900MHz. Some dual band RFID structures are discussed in this paper.

    pdf5p tuanlocmuido 13-12-2012 36 6   Download

  • This book explores both the state-of-the-art and the latest achievements in UWB antennas and propagation. It has taken a theoretical and experimental approach to some extent, which is more useful to the reader. The book highlights the unique design issues which put the reader in good pace to be able to understand more advanced research.

    pdf0p cucdai_1 19-10-2012 32 5   Download

  • State-of-the-Art Antenna Technology: The 2008 Antenna Applications Symposium From: Vol. 52 | No. 1 | January 2009 | Page 24 by Daniel Schaubert, University of Massachusetts; Jennifer Bernhard, University of Illinois; Robert Mailloux, US Air Force Research Laboratory; W. Devereux Palmer, US Army Research Office The Antenna Applications Symposium and its predecessor, the Air Force Antenna Symposium, have for more than 50 years provided a unique forum for exchange of ideas and information about the practical aspects of antenna design, development and use in systems....

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  • This paper concentrates on studying, designing and manufacturing a dual – band and high – bandwidth antenna applied for advance mobile handsets. This antenna can work in GSM/UMTS bands by generating two resonant modes of 900 MHz and 1900 MHz frequencies. Antenna is printed on FR4 substrate with size of 58 mm x 80 mm, thickness of 1.6 mm and relative permittivity of 4.4. The propose antenna is experimentally studied. Keywords: Antenna, dual-band, monopole, microstrip antenna.

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  • The Topic of microstrip antennas is an old subject that started over 40 years ago. Microstrip antennas are low profile and easily fabricated. This subject has passed through several stages that make it survive tell now and still in continues progress. The main stage is the development of low loss low cost dielectric materials that make it possible to design an effi‐ cient low profile microstrip patches. The stage of developing analysis methods and models that helped in the design of radiating...

    pdf0p lyly_5 22-03-2013 23 2   Download

  • In this paper, a new design of pencil-beam planar dipole array antenna (PDAA) with reflector back has been designed and fabricated for IEEE 802.11ac outdoor applications. The proposed antenna is a planar array combined with a reflector.

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  • In this paper, a new amplify and forward (AF) asynchronous cooperative relay network using maximum ratio combining (MRC) and transmit antenna selection (TAS) technique is considered. In order to obtain a maximal received diversity gain, the received signal vectors from all antennas of the each relay node are jointly combined by MRC technique in the first phase. Then, one antenna of each relay node is selected for forwarding MRC signal vectors to the destination node in the second phase.

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  • This paper proposes a 8 × 1 sprout-shaped antenna array with low sidelobe level (SLL) for outdoor point to point applications. The array has the dimensions of 165 mm × 195 mm × 1.575 mm and is designed on Rogers RT/Duroid 5870tm with the thickness of 1.575 mm and permittivity of 2.33. In order to achieve low SLL, Chebyshev distribution weights corresponding to SLL preset at -30 dB has been applied to design the feed of the array.

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  • The following will be discussed in this chapter: Electric and magnetic field coupling; EM radiations; period, frequency, and wavelength; phase lag and phase lead; antennas why??? antenna analogy; why separate TX and RX antennas transmission are required; transmission line as an antenna; working of an antenna; far and near fields; antennas characteristics.

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  • The following will be discussed in this chapter: Dipole antenna, antenna gain, antenna length, radiation mechanism, radiation pattern, antenna efficiency, beam width, types of antennas, propagation modes, noise categories.

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  • The following will be discussed in this chapter: Antenna functions, isotropic antenna, radiation pattern, parabolic reflective antenna, antenna gain, signal loss in satellite communication, noise types, refraction, fading, diffraction and scattering, fast and slow fading, flat and selective fading, diversity techniques.

    ppt136p deja_vu7 10-05-2018 3 1   Download


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