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Antenna Theory and Microstrip Antennas offers a uniquely balanced analysis of antenna fundamentals and microstrip antennas. Concise and readable, it provides theoretical background, application materials, and details of recent progress. Exploring several effective design approaches, this book covers a wide scope, making it an ideal hands-on resource for professionals seeking a refresher in the fundamentals. It also provides the basic grounding in antenna essentials that is required for those new to the field. The book’s primary focus is on introducing practical techniques that will enable users to make optimal use of powerful commercial software packages and computational electromagnetics used in full wave analysis and antenna design. Going beyond particular numerical computations to teach broader concepts, the author systematically presents the all-important spectral domain approach to analyzing microstrip structures including antennas. In addition to a discussion of near-field measurement and the high-frequency method, this book also covers: Elementary linear sources, including Huygen’s planar element, and analysis and synthesis of the discrete and continuous arrays formed by these elementary sources The digital beam-forming antenna and smart antenna Cavity mode theory and related issues, including the design of irregularly shaped patches and the analysis of mutual coupling Based on much of the author’s own internationally published research, and honed by his years of teaching experience, this text is designed to bring students, engineers, and technicians up to speed as efficiently as possible. This text purposefully emphasizes principles and includes carefully selected sample problems to ease the process of understanding the often intimidating area of antenna technology. Paying close attention to this text, you will be able to confid

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IEEE Antennas and Propagation Society. International Symposium

Published: 2001

Total Pages: 908


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The near-field measurement technique has been used extensively for electrically large antennas which can not be easily tested on a far-field range. In reconstructing the far-field antenna patterns from the near-field measurements, a planar configuration may be used with a computation based on the Fast Fourier Transform (FFT). The near-field data are generally sampled over a planar grid at the Nyquist sampling rate of (lambda sub zero)/2 spacing or less. For electrically large antennas, sampling at the Nyquist rate requires long data acquisition times over which significant system electronic drift may occur. Furthermore, the computer capacity may limit the largest size of the data set. Special data filtering techniques for large data sets have been reported. However, these techniques still require sampling at (lambda sub zero)/2 spacing.
This book describes the aspects of antenna test ranges, data processing schemes and measurement schemes.
Vols. for 1978- consist of the proceedings of the 1st- National Conference on the Capabilities and Limitations of Thermal Infrared Sensing Technology in Energy Conservation Programs; for 1984-1989, the International Conference on Thermal Infrared Sensing for Diagnostics and Control; for 1990, the International Conference on Thermal Sensing and Imaging Diagnostic Applications.
This report addresses the problem of formulating planar near-field antenna measurements in the time domain, so that a single set of time-domain near-field measurements yields the far-field pattern in the time domain or over a wide range of frequencies. The time-domain planar near-field techniques are developed for both acoustic and electromagnetic fields and the space outside the region occupied by the antenna is assumed to be isotropic and homogeneous. Probe correction is ignored, that is, it is assumed that the probe is ideal so that the exact values of the field on the measurement plane are known. Two fundamentally different approaches are used in deriving time-domain formulas which give the fields in the half space z> z sub 0, in terms of their values on the plane z = z sub 0. In the first approach the time-domain formulas are obtained by inverse Fourier transforming the corresponding frequency-domain formulas. Since this approach requires extensive use of the frequency domain near-field formulas, we start by giving a rigorous derivation and review of the frequency-domain formulation that addresses a number of subtleties that have not been dealt with adequately in the literature. As part of this review, planar near-field formulas for the static electric and magnetic fields are derived for the first time. In the second approach the time-domain near-field formulas are derived directly in the time domain. The equivalence of the resulting time- domain formulas obtained by the two different approaches demonstrates the validity of the formulas and the utility of both approaches. Near-field measurements, Planar scanning, Time-domain.