Download or read book The Design of Impedance Matching Networks for Broadband Antennas written by S. T. Li and published by . This book was released on 1987 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interactive BASIC language computer program to aid in the design of a matching network for a broadband antenna is described. Guidelines for the design of a broadband matching network are presented. The Antenna Matching (ANTMAT) program provides a computer-aided design tool for determining network topology and component values of the networks. It improves the speed and accuracy of the broadband matching network design procedures. An optimization algorithm finds that the values of the components that minimize the input reflection coefficient. At first, the optimization algorithm with an exponential weighting function is employed for determining a list of network candidates (either a pi network for a T network) from which a network topology is selected. After a topology is specified, the optimization algorithm with other weighting function is used for finding optimum element values. Keywords include: Interactive computer program, Computer-aided design, Network topology, and Optimization algorithm.
Download or read book Antennas with Non Foster Matching Networks written by James T. Aberle and published by Morgan & Claypool Publishers. This book was released on 2007-12-01 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. The approach for making this transformation is to make use of non-Foster circuit elements in the matching network of the antenna. By doing so, we are no longer constrained by the laws of physics that apply to passive antennas. However, we must now design and construct very touchy active circuits. This new antenna technology is now in its infancy. The contributions of this lecture are (1) to summarize the current state-of-the-art in this subject, and (2) to introduce some new theoretical and practical tools for helping us to continue the advancement of this technology.
Download or read book Broadband Lossy Impedance Matching of Antennas written by Kaiming Li and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In RF applications such as transmitters, amplifiers, receivers, and antennas, a task of vital importance is the design of an impedance matching network, one that can transfer the most power from the source to the load. Lossless matching networks at a single frequency have been well studied, while the broadband impedance matching problem was only defined 70 years ago. This dissertation provides a thorough background of the theory basis and design approaches in the history of broadband impedance matching. Lossless impedance matching optimization using the MATLAB Global Optimization Toolbox is discussed, and an approach combining brute-force techniques and the Real Frequency Technique is proposed. The bandwidth of a candidate 80-meter high-frequency dipole antenna has been increased from 4.1% to at least 15.0% after the optimization, with a Voltage Standing Wave Ratio (VSWR) of 2:1. In order to match the source and load over a wide band, a tradeoff is forced between the antenna gain and its bandwidth. The lossy impedance matching problem is investigated in the dissertation as a multi-objective optimization problem. Multiple optimization algorithms are used to find the Pareto front for a given lossy network topology. With equal weight on the objectives, the bandwidth of the dipole is further increased to 16.9%. This approach was applied to conformal antennas such as a low-profile bow-tie antenna close to a ground plane and compared with the new approach of using metamaterial inserted between the antenna and the ground plane. There is considerable interest and a main goal of this dissertation to find if another approach such as this lossy matching method could compete with the metamaterial technique. With lossy matching, the unnecessarily high gain of the antenna is traded in for a decrease in the reflection, increasing the bandwidth of the bow-tie to more than 70.7%, or [200MHz, 400MHz]. Considering the high cost of manufacturing metamaterial to achieve similar performance, the approach found for the first time in this dissertation is a iv significant breakthrough in the design and practicality of making future conformal and other types of antennas. The unique and innovative techniques utilized in this dissertation include performing lossless and lossy impedance matching optimization using results from more numerical platforms like FEKO and GNEC for various antenna configurations. In this dissertation topologies have been thoroughly explored including circuits with various numbers of elements and those including the insertion of lossy components into the lossless networks. Additionally, the latest nature-inspired optimization algorithms were applied to the lossy impedance matching problem and compared with the traditional algorithms.
Download or read book Theory and Design of Broadband Matching Networks written by Wai-Kai Chen and published by Elsevier. This book was released on 2013-10-22 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory and Design of Broadband Matching Networks centers on the network theory and its applications to the design of broadband matching networks and amplifiers. Organized into five chapters, this book begins with a description of the foundation of network theory. Chapter 2 gives a fairly complete exposition of the scattering matrix associated with an n-port network. Chapter 3 considers the approximation problem along with a discussion of the approximating functions. Chapter 4 explains the Youla's theory of broadband matching by illustrating every phase of the theory with fully worked out examples. The extension of Youla's theory to active load impedance is taken up in Chapter 5. This book will be useful as a reference for practicing engineers who wish to learn how the modern network theory can be applied to the design of many practical circuits.
Download or read book The Design of Antenna Matching Networks Using a Microcomputer written by S. T. Li and published by . This book was released on 1988 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a communication system one of the primary concerns is maximum efficiency in signal transmission and reception. For maximum power transfer there must be an impedance match between the antenna and transmitter (or receiver). A basic problem is to design a coupling network between a given source and a given load so that the transfer of power from the source to the load is maximized over a given frequency band of interest. The device used to perform this impedance matching is called an antenna matching network. The number of pieces of equipment requiring an antenna connection in some applications may exceed the number of acceptable locations available for antennas. One solution is the use of broadband antennas that have a low VSWR (voltage standing-wave ratio) over the operating band. Broadband antennas are used in conjunction with multicouplers (filters with multiple inputs) to provide a sufficient number of antenna connections. Despite the aid of Smith Charts, the traditional design of an antenna matching network by engineering experience and manual calculation means is an extremely time-consuming task. This paper is intended to relieve the engineer of the tedious numerical calculation involved in the network design. (KR).
Download or read book Antenna Impedance Matching written by Wilfred N. Caron and published by Amer Radio Relay League. This book was released on 1989-01-01 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of Broadband Matching Networks for Microstrip Resonator Antennas written by Gregory Michael Corsetto and published by . This book was released on 1978 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of Ultra Wideband Antenna Matching Networks written by Binboga Siddik Yarman and published by Springer Science & Business Media. This book was released on 2008-08-25 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of Ultra Wideband Antenna Matching Networks: via Simplified Real Frequency Technique (SRFT) will open up a new horizon for design engineers, researchers, undergraduate and graduate students to construct multi-band and ultra wideband antenna matching networks for antennas which in turn will push the edge of technology to manufacture new generation of complex communication systems beyond microwave frequencies both in commercial and military line. In Design of Ultra Wideband Antenna Matching Networks, many real life examples are presented to design antenna matching networks over HF and cellular commercial multi-band frequencies. For each example, open MatLab source codes are provided so that the reader can easily generate and verify the results of the examples included in the book.
Download or read book Broadband Matching written by Wai-Kai Chen and published by World Scientific. This book was released on 2015-10-13 with total page 879 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The third edition presents a unified, up-to-date and detailed account of broadband matching theory and its applications to the design of broadband matching networks and amplifiers. A special feature is the addition of results that are of direct practical value. They are design curves, tables and explicit formulas for designing networks having Butterworth, Chebyshev or elliptic, Bessel or maximally flat group-delay response. These results are extremely useful as the design procedures can be reduced to simple arithmetic. Two case studies towards the end of the book are intended to demonstrate the applications to the practical design of modern filter circuits."--
Download or read book Microwave Filters Impedance matching Networks and Coupling Structures written by George L. Matthaei and published by . This book was released on 1964 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Broadband Direct Coupled and Matching RF Network written by Thomas Remy Cuthbert and published by . This book was released on 1999 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Analysis of Low profile Broadband Monopole Vehicle Antennas and Matching Network Synthesis written by Steven Donald Eiken and published by . This book was released on 1993 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compact and Broadband Microstrip Antennas written by Kin-Lu Wong and published by John Wiley & Sons. This book was released on 2004-04-07 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compact microstrip antennas are of great importance in meeting the miniaturization requirements of modern portable communications equipment This book is a comprehensive treatment of design techniques and test data for current compact and broadband microstrip designs Summarizes the work of the author and his graduate students who have published over 80 refereed journal articles on the subject in the past few years Advanced designs reported by various other prestigious antenna designers are incorporated as well
Download or read book The Theory and Design of Broadband Matching Networks written by Wai-Kai Chen and published by Pergamon. This book was released on 1976 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Technique for Designing Broadband Impedance Matching Networks for Complex Loads written by Masao Shimoji and published by . This book was released on 1982 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Practical Introduction to Impedance Matching written by Robert L. Thomas and published by Artech House Publishers. This book was released on 1976 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computer aided Design of Optimal Broadband Impedance matching Network written by Michael Wei-Chen Lin and published by . This book was released on 1993 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
