Antenna Theory: Analysis And Design
Antenna Theory: Analysis and Design, Fourth Edition is designed to meet the needs of senior undergraduate and beginning graduate level students in electrical engineering and physics, as well as practicing engineers and antenna designers.Constantine A. Balanis received his BSEE degree from the Virginia Tech in 1964, his MEE degree from the University of Virginia in 1966, his PhD in Electrical Engineering from The Ohio State University in 1969, and an Honorary Doctorate from the Aristotle University of Thessaloniki in 2004. From 1964 to 1970, he was with the NASA Langley Research Center in Hampton, VA, and from 1970 to 1983, he was with the Department of Electrical Engineering of West Virginia University. In 1983 he joined Arizona State University and is now Regents' Professor of Electrical Engineering. Dr. Balanis is also a life fellow of the IEEE.
Antenna Theory: Analysis and Design
Slotted waveguide antenna arrays are used in radar, communication and remote sensing systems for high frequencies. They have linear polarization with low cross-polarization and low losses but can also be designed for dual polarizations and phase steered beams. Slotted Waveguide Array Antennas is the first comprehensive treatment of these antennas from an engineering perspective. It provides readers with a thorough foundation in applicable theories as well as hands-on instruction for practical analysis, design, manufacture and use of important types of waveguide slot arrays. It goes beyond some of the commonly discussed topics and ventures into areas that include higher order mode coupling and edge effects; performance optimisation in terms of bandwidth and pattern performance and manufacturing tolerances. With specific examples of waveguide array designs, accompanied by detailed illustrations and antenna characteristics, the book is a must-have reference for engineers involved in antenna design, development and applications.
Based on the analysis of the single-slot antenna in the previous chapters we can now approach the problem of designing linear and planar slot arrays. We will first study longitudinal slot arrays and start with the simple case with one row of slots in a rectangular waveguide. For this case mutual coupling appears mainly in the H-plane and can in many cases be neglected. Some examples of computed and measured performance will be presented. Procedures for designing linear arrays of slots, including some examples, will be discussed.
In this chapter, we will present Elliott's design procedure for planar standing wave slot arrays including a detailed design example with computed and measured results. For large planar arrays a modification to Elliott's design procedure using an infinite array model is sometimes preferred. Large standing wave arrays can be broken up into sub-arrays with a parallel feed network to improve bandwidth. Important parameters are the total normalised slot conductance of radiating waveguides and the total normalised resistance of feed waveguides. Additional examples of slot array designs will be presented, including a procedure for designing a travelling wave feed to excite radiating waveguides with either standing wave or travelling wave slot arrays. Other design and analysis methods in the literature will also be reviewed.
In this chapter we will discuss a number of concepts and models used in advanced design and optimisation of slot arrays. Models for coupling slots will be presented followed by a discussion of the edge wall slot and the compound radiating slot. Iris-excited longitudinal slot arrays, slot arrays in ridge waveguides and slot arrays covered by a dielectric layer will also be discussed. Higher-order mode coupling between adjacent coupling slots and that between a coupling slot and radiating slots in its immediate vicinity will be presented. A method of incorporating the finite ground plane effects in the design and analysis will be described. The MoM solution to the coupled integral equations for the apertures of all slots in a planar array will be discussed. Some examples employing the moment method solutions of slot arrays for improved designs will be presented.
In this book we have analysed the design of several types of slotted waveguide array antennas, from theories and optimisation to applications and manufacturing techniques. In this last chapter we will discuss the current status in the field and look at new technologies and new applications recently presented and researched. Still, in this short overview it is not possible to mention all the details of the evolving field; the reader is referred to the respective chapters and the references for more information.
The discipline of antenna theory has experienced vast technological changes. In response, Constantine Balanis has updated his classic text, Antenna Theory, offering the most recent look at all the necessary topics. Like the previous editions, Antenna Theory, Third Edition 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 as well. The text assumes that the readers have a knowledge of basic undergraduate electromagnetic theory, including Maxwell's equations and the wave equation, introductory physics, and differential and integral calculus.
Antenna Theory: Analysis and Design, Fourth Edition is designed to meet the needs of senior undergraduate and beginning graduate level students in electrical engineering and physics, as well as practicing engineers and antenna designers.
In this study an eight-channel active analog beamforming structure is designed and developed in subsystems by using a Applied Wave Research (AWR) simulation program. This structure works in S-band and contains true-time-delay (TTD) systems. The simulation results and the results obtained from the manufactured structure are compared. In the comparison, the TTD values for different time delay steps and phase difference measurements between channels are analyzed and interpreted. The test results show that desired performance is obtained from the designed and manufactured PCB. However, it is observed that feeding each antenna element with single channel beamforming board would be more appropriate.
The teaching activities include lessons carried out using multimedia presentations and images (38 hours). In addition, practice lessons (10 hours) are carried out using software for the analysis and the design of microwave antennas and devices.Further information about the lessons will be provided just before the beginning of the course.Videos of the lessons will be uploaded to the Elly web-site of the course, so that students can follow them in an asynchronous modeAdditional teaching material used during the lessons is uploaded to the Elly web site. The registration to the course is necessary to download the slides.Students who are not attending to the course should periodically check the teaching material and the information provided by the professor on the Elly web site.
This paper presents the design of microstrip antennas for L, S and C band applications. The rectangular microstrip patch antennas are designed at a frequency of 2GHz and have been simulated using Mentor Graphics IE3D simulation software. The substrate used in the design is FR-4 glass epoxy which has a dielectric constant of 4.2. The operating frequency range is 1-7 GHz. The modified microstrip antenna with plus shaped slot at the centre of the patch yields an overall bandwidth of 10.47 % and lowest resonant frequency of 1.71 GHz. This antenna provides the size reduction of 13.63 %. 041b061a72