Short Courses

Full Day Short Courses

Half Day Short Courses - July 7th (Afternoon)

Half Day Short Courses - July 13th (Morning)

Half Day Short Courses - July 13th (Afternoon)

Full Day Courses
Sunday July 7, 2013

Electromagnetic Metamaterials: Homogenization Theory and Their Applications from Radio-Frequencies to the Visible

Andrea Alu -University of Texas at Austin, USA.

This short course will provide a broad introduction to the field of electromagnetic metamaterials, covering a wide range of topics, from the theoretical approaches to study anomalous wave propagation in periodic arrays of resonant inclusions and the relevant challenges in describing the wave propagation in these arrays in terms of a homogeneous material, to their application in a variety of fields of research and over a wide spectrum of frequencies. After a background on homogenization theories and proper characterization of metamaterials, the course will focus on various exciting properties and applications of metamaterials, in order to realize electromagnetic cloaks, negative-index materials, sub-diffractive waveguides and antennas, enhanced nonlinearities, sensing, imaging and energy harvesting devices, optical nanocircuits and nanoantennas and various other exciting wave phenomena. I will discuss in detail how these concepts may be applied to overcome current technological challenges and provide breakthroughs in applied fields related to electromagnetics, radio-science and optics.

Advanced preconditioning techniques for computational electromagnetics

Francesco P. Andriulli - ENST Bretagne, France and Eric Michielssen - The University of Michigan, USA,

This course reviews the state of the art in effective preconditioning techniques for integral equations pertinent to the analysis of electromagnetic boundary value problems. The techniques covered permit the construction of rapidly convergent iterative solvers for electric and combined field integral equations and as such are a perfect complement to fast multipole and related accelerators. Applications of these techniques range from antenna analysis to the characterization of microwave devices and circuits, the analysis of electromagnetic compatibility phenomena, and the synthesis of metamaterials. The course will cover theoretical and practical issues related to the development and implementation of several preconditioners, including those that derive from Calderon identities. Moreover, the course will detail the incorporation of the presented techniques into integral equation codes and their interaction with fast matrix-vector multiplication schemes.

Antenna Arrays

Randy L. Haupt- Colorado School of Mines, USA

This course provides a broad overview of traditional and current antenna array topics with emphasis on practical implementation. The morning will be an overview and historical development of antenna arrays followed by array basics like beam steering, sidelobe control, modeling, mutual coupling, design equations, and elements. The afternoon is devoted to conformal arrays, wideband arrays, arrays in the time domain, adaptive nulling, direction finding, reconfigurable arrays, and array architectures. Array designs will be covered along with approaches to the numerical modeling of antenna arrays.

Reflector Antenna Design and Analysis

Peter Meincke- Ticra, Denmark

The course gives an introduction to the design and analysis of single and dual reflector antennas, center-fed as well as offset. After a review of the analysis methods commonly employed for space- and Earth-station reflector antennas, the basic design principles are presented. First, single and dual spot-beam antennas are considered with the relation between size, feed illumination, directivity, and sidelobe level. Second, the influence of blockage by struts, subreflector, and feed is discussed. Third, the origin of cross polarization in offset designs is addressed and it is shown how to improve the polarization characteristics in dual reflector systems by employing the Mizuguchi compensation principle. Hands-on experience in reflector antenna design is obtained during the course by using the software package GRASP (participants must bring their own laptop).

Electromagnetic Band Gap (EBG) Structures in Antenna Engineering: From Fundamentals to Recent Advances

Yahya Rahmat-Samii-University of California Los Angeles, USA, Fan Yang-Tsinghua University, Beijing, China; The University of Mississippi, USA,

This comprehensive and application-oriented short course on the state-of-the-art in electromagnetic band gap (EBG) engineering explains the theories, designs, and antenna applications of EBG structures. The course will start with an overview of the EBG research history and important discoveries. An accurate and efficient FDTD/PBC algorithm will be presented for general periodic structures analysis. Next, detailed presentations will be provided on the unique electromagnetic features and diverse functional designs of EBG structures. Furthermore, a wealth of practical antenna examples with design details will be presented to illustrate promising applications of EBG structures in antenna engineering.

Half Day Courses
Sunday July 7, 2013

4G/Multiband Handheld Device Antennas and Their High-Isolation Antenna Systems

Kin-Lu Wong- National Sun Yat-Sen University, Taiwan

Promising 4G/multiband handheld device antennas will be presented. Small-size yet wideband techniques to cover the LTE/WWAN operation such as using the printed λ/8 PIFA, λ/4 loop, λ/8 half-loop, and λ/4 slot antennas will be addressed. The ground antenna concept suitable for very slim or flexible handheld device applications to achieve very small antenna size (less than 8 x 10 mm2) for LTE/WWAN operation will be introduced. Effects of the shaped system ground plane on bandwidth enhancement of the handheld device antennas are included in the discussion. Some promising handheld device antenna structures including the high-isolation, high-efficiency antenna systems for MIMO or dual talk (dual WWAN) operation will also be presented. Future trends for the intelligent handheld device antennas including the tunable and reconfigurable antennas that can be adaptive to environmental changes or tunable to cover different bands or switched to have multi-beams will be discussed.

Advanced Impedance Matching and Impedance Analysis for Antenna Applications

Jussi Rahola- Optenni Ltd., Finland

The main topics of the course are: 1) impedance matching and matching circuit analysis using the theory of power waves, 2) estimating the obtainable antenna bandwidth using the concept of bandwidth potential and 3) estimating the worst-case isolation in multiantenna systems using the concept of electromagnetic isolation.

In part 1, the basics of impedance matching are reviewed. The theory of power waves greatly simplifies the analysis of matching circuits where complex termination impedances are used. Contrary to the generally used travelling wave theory, the power wave theory describes directly the propagation of power in microwave networks with complex termination impedances. Using just one S parameter analysis, both the impedance matching and efficiency of a matching circuit can be analyzed. For multiport systems, simultaneous multiport matching will be discussed. In part 2, the obtainable bandwidth of an antenna through a matching circuit is estimated using the concept of bandwidth potential. Contrary to the Q value analysis, the bandwidth potential gives meaningful results also when wideband resonances or multiple resonances are present. This concept can be used to select best antenna candidates in an early design stage. In part 3, it is shown how the effect of impedance matching can be removed in isolation analysis using the concept of electromagnetic isolation. This concept can be used for example to analyze the effect of metamaterials to antenna isolation, as it removes the effect of the changing input impedances of the antennas. The course is targeted for antenna and RF engineers and researchers who study new antenna concepts or need to use matching circuits in their work. It reviews the definitions of the reflection coefficient, S and Z parameters (also in the multiport case).

Wearable Antennas for Medical Applications

Albert Sabban- Ort Braude College, Israel

Biomedical industry is in continuous growth in the last few years. Low profile compact antennas are crucial in the development of wearable human biomedical systems. Several wearable antennas will be presented in the course. Design considerations, computational results and measured results on the human body of several compact wideband microstrip antennas with high efficiency will be presented in the course. The course topics are: Microstrip wearable antennas, Loop wearable antennas, Helix wearable antennas, Antennas S11 Variation as Function of Distance from Body, Tunable antennas and Applications of wearable antennas.

Half Day Courses
Saturday July 13, 2013

Natural and Metamaterial Antennas with Emphasis on Dual-, Wide-, and Extremely Wide-band Operation

Hisamatsu Nakano- Hosei University, Japan

Antennas with dual-, wide-, and extremely wide-band operation have been receiving considerable attention, in response to recent developments in communication systems, e.g., mobile, digital TV, and satellite communication systems. These antennas are categorized as either natural or metamaterial (MTM) antennas. The former have an electromagnetic property found in nature (right-handed property) and the latter have an electromagnetic property not existing in nature (left-handed property or composite right- and left-handed property) and hence are called MTM antennas. Choice of either a natural antenna or an MTM antenna depends on the requirements of the target communications system.

This course presents recent progress in natural and MTM antennas, with an emphasis on realization of dual-, wide-, and extremely wide-band operation, and is composed of three chapters. Chapter 1 describes the historical background of natural and MTM antennas, focusing on their frequency responses. Starting with the self-complementary antenna technique and leaky wave antenna technique, we proceed to novel techniques using MTMs. Broadside beam formation and tilted beam formation are also discussed. Chapter 2 summarizes the analysis methods for natural and MTM antennas. The method of moments and the finite-difference time-domain method are briefly described. In addition, an equivalent-circuit representation for MTM antennas is presented and useful design equations are explained. Chapter 3 presents the design and radiation characteristics of several representative natural and MTM antennas, including (1) a dual-band card antenna, (2) a PaSP card antenna (Patch with a Shorted Parasitic Patch) for LAN and UWB systems, (3) an extremely wide-band elliptical card antenna for USB devices, (4) a wide-band cross fan-shaped (FASH) base-station antenna, (5) a BOR-SPR base-station antenna (composite of a conducting body of revolution element and a shorted parasitic ring element) and Modified BOR-CROSS base-station antenna, (6) grid array antennas for beam-scanning, (7) an inverted-F tilted-bam antenna with an EBG reflector, (8) a spiral antenna with an EBG reflector, (9) an MTM strip-line antenna for beam-scanning, (10) an MTM curl antenna, and (11) an MTM spiral antenna. Note that the MTM antennas in (10) and (11) have dual-band and counter circularly-polarized characteristics.

Introduction to Microstrip Antennas

David R. Jackson-University of Houston, USA

This short course will present an overview of microstrip antennas, starting with the most basic aspects and leading to a review of present trends and recent developments. Topics will include an overview of the basic properties for both rectangular and circular shapes, feeding methods, equivalent-circuit models, input impedance, radiation patterns, surface-wave excitation, radiation efficiency, CAD formulas for the basic antenna properties, circular polarization, bandwidth enhancement schemes, miniaturization techniques, mutual coupling, and arrays.

State-of-the-Art in the Design of Electrically Small Antennas

Steven R Best- MITRE, USA

Syllabus: Optimization of the performance properties of electrically small antennas represents a challenging design problem for the antenna engineer. As wireless devices decrease in size, there is an increasing demand for physically smaller antennas, yet the performance requirements are rarely relaxed. This 1/2-day short course provides a detailed discussion on the theory, challenges, performance trade-offs and design approaches associated with electrically small antennas.

The short course begins with an overview of the fundamental theory and inherent limitations of small antennas. The presentation focuses on providing an understanding of small antenna performance in terms of impedance, radiation patterns, bandwidth, radiation efficiency, matching efficiency, and quality factor (Q). Techniques used to design self-resonant and impedance matched electrically small antennas are described and compared. The relationships between the small antenna's performance properties and its physical characteristics are discussed in detail. The performance of the small antenna on small finite ground planes is considered with a particular emphasis on how the antenna's location on the ground plane affects impedance, pattern and polarization properties. This short course also presents and describes practical approaches for the design of wireless device antennas. These discussions include an understanding of the basic theory of these designs, equivalent circuit analysis, and ground plane effects.

Learning Objective: Participants will understand the basic challenges and limitations associated with designing small antennas for wireless communications systems and devices. Participants will also understand the basic approaches and techniques used to design a number of practical electrically small antennas.

Presentation and Materials: The course will be presented using PowerPoint slides. Students will be provided copies of the slides.