2008 Index IEEE Transactions on Control Systems Technology Vol. 16

This index covers all technical items - papers, correspondence, reviews, etc. - that appeared in this periodical during the year, and items from previous years that were commented upon or corrected in this year. Departments and other items may also be covered if they have been judged to have archival value. The Author Index contains the primary entry for each item, listed under the first author\u27s name. The primary entry includes the coauthors\u27 names, the title of the paper or other item, and its location, specified by the publication abbreviation, year, month, and inclusive pagination. The Subject Index contains entries describing the item under all appropriate subject headings, plus the first author\u27s name, the publication abbreviation, month, and year, and inclusive pages. Note that the item title is found only under the primary entry in the Author Index

2009 Index IEEE Antennas and Wireless Propagation Letters Vol. 8

This index covers all technical items - papers, correspondence, reviews, etc. - that appeared in this periodical during the year, and items from previous years that were commented upon or corrected in this year. Departments and other items may also be covered if they have been judged to have archival value. The Author Index contains the primary entry for each item, listed under the first author\u27s name. The primary entry includes the coauthors\u27 names, the title of the paper or other item, and its location, specified by the publication abbreviation, year, month, and inclusive pagination. The Subject Index contains entries describing the item under all appropriate subject headings, plus the first author\u27s name, the publication abbreviation, month, and year, and inclusive pages. Note that the item title is found only under the primary entry in the Author Index

Metamaterial-Inspired Frequency-Selective Surfaces.

This dissertation presents a new approach to designing frequency-selective surfaces having extensive applications in communications and radar systems. Unlike conventional surfaces composed of resonance-length elements, the new structures use sub-wavelength elements, and therefore, operate in TEM mode. Consequently, their frequency response is harmonic-free up to a frequency where their elements' dimensions become comparable with the wavelength. Hence, their behavior is described through quasi-static circuit models. These surfaces, which will be referred to as miniaturized-element surfaces, are easily synthesized since filter theory and circuit simulators are utilized in their design process. The small dimensions of the elements of the surface and its TEM mode of operation decrease the surface sensitivity to the incidence angle of the excitation (plane-wave). This allows the application of such surfaces in conjunction with phased-arrays and their placement in close proximity to an antenna. These surfaces can also operate properly with smaller panel dimensions. The theory of the new surfaces is introduced in Chapter 3 where a surface consisting of an array of wavelength/12-long elements is presented. The transmission response of this surface includes a passband and a transmission zero. For this design, the first harmonic is located at a frequency six times higher than the operation frequency. Using varactors, frequency tuning of nearly an octave is shown. Chapter 4 presents multipole spatial filters. Through an accurate circuit model, dual-bandpass and maximally flat filters that are wavelength/240 thick are demonstrated. Chapter 5 introduces a reconfigurable surface that produces a frequency response with two operation modes: bandstop and bandpass. Moreover, using varactors, the center frequency and the bandwidth are tuned independently. The discussion on tunability is continued in Chapter 6 which introduces another varactor-tuned structure that operates, similar to the previous designs, without additional biasing circuitry for the varactors. However, this structure is immune to single point failure as it uses a parallel biasing method. Finally, Chapter 7 demonstrates a wavelength/10-thick, coupled filter-antenna array to achieve a high-order filtering for beamforming arrays. This design eliminates the need for integrating bulky filters required in the receive chain of array elements.Ph.D.Electrical EngineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/64588/1/farhadbp_1.pd

Switched-beam antenna array design for millimeter-wave applications

The limited coverage of wireless communication at the millimeter-wave frequency band due to large free-space path loss, i.e. large signal attenuation, has been a major problem. Furthermore, shadowing and small-scale fading may reduce the received signal even more. An array of rod antennas is designed to tackle those problems by providing high gain, broad scan range, and a shaped beam. Each patch, which couples the electromagnetic wave to the rod, is fed by a coplanar waveguide (CPW) feedline. Each rod antenna demonstrates 18 dBi realized gain and 20° half power beamwidth (HPBW). Moreover, the 4 GHz bandwidth of the antenna provides high data rate for the gigabit wireless application. Furthermore, the Radio Frequency Microelectromechanical System (RF MEMS) switch is used to realize a switched antenna with a broad scan range. The design method and the characterization of the antenna are presented. The proposed antenna system is suitable for a wide range of applications, such as wireless high definition video/audio, USB and firewire replacement, Frequency Modulated Continuous Wave (FMCW) radar, and home/office backhaul application at millimeter-wave frequency

Moniantennijärjestelmät autoympäristössä

MIMO systems have emerged in the last few years as a means to improve the quality of service and spectral efficiency of wireless communication systems. This thesis examines the use of multi-antenna systems on vehicles. The main objectives of this thesis are to develop a procedure for the design of multi-antenna systems, compare the benefits of different multi-antenna systems in automotive environment, study the suitability of the chosen electromagnetic simulation method to modelling and simulation of automotive antennas, and also to give ample references for the reader, in case a more in-depth understanding in the areas of multi-antenna techniques and automotive antennas is needed. The electromagnetic simulation of the antenna systems are based on the finite integration technique with commercial software, while link level performance simulation is performed on a MATLAB implementation of the SCME radio channel model. The finite integration technique is found to provide accurate radiation pattern results, and it can be recommended for the purpose of simulation of automotive antenna systems at the 700 MHz carrier frequency. On link level simulations the focus is on simulating 2×2 multiantenna systems. These simulations imply a noticeably improved BER when a BF MIMO system is employed, compared to the traditional MIMO system. The BF MIMO is a new concept that combines the best sides of beamforming and MIMO. This is the first study where the BF MIMO concept is applied to antennas in automotive environment. The results for the different antenna array configurations were indeterminate. In general, it can be said that the radio channel (or channel model) is one of the most significant factors in determining the performance of a multi-antenna systems, and it is highly unlikely that any single array configuration can provide optimal performance in every channel conditions. The first part of this thesis, Chapters 2 and 3, provides background of multi-antenna systems. Theoretical concepts of multi-antenna systems are introduced in Chapter 2 to enable the analysis of such systems. In the third chapter, a literature survey is presented as a summary of related studies on the areas of automotive antennas, multi-antenna systems, related information theory and electromagnetic simulation methods of antennas. In the latter part of this thesis, Chapter 4 describes the electromagnetic and link level simulation software packages and the simulation of the antennas. The results are presented in Chapter 5, and conclusions are drawn in Chapter 6. /Kir1

Characterisation of human body and environmental effects on the performance of mobile terminal antennas

PhDProvision of efficient services to the user anywhere at anytime is being a centre of research and development in Wireless Personal Area Networks (WPAN) and Wireless Body Area Networks (WBAN). Antenna is the essential part of WPAN/WBAN applications that got affected by two major factors: human body presence and nature of the surrounding environment. The presence of the human body in the proximity of the antenna causes electromagnetic (EM) reflections from the body surface and absorptions in the lossy body tissues resulting in antenna detuning, radiation pattern degradations and impedance mismatch. On the other hand, incident radio waves undergo reflections, difractions and scattering from the surrounding environment objects including buildings, trees, vehicles and ground, causing multipath fading. The thesis gives an overview of the main investigations, results and analyses accomplished in a study concerning the commercially available Bluetooth and GPS antennas working in the vicinity of the human body. Detailed numerical modelling process is adopted followed by measurements for validation. The thesis highlights the role of surface waves as a potential transmission medium in an on-body Bluetooth wireless communication link taking into account the effects of antenna-body separations and presence of the surrounding objects blocking the direct communication path. The thesis also presents a novel statistical model to evaluate the performance of GPS mobile terminal antennas in the multipath environment. This model characterises the antenna performance and identifies the key factors that can be used to enhance it, in a real working environment outside an anechoic chamber. The study also deals with presence of the human body in the multipath environment and its effects on the operation of the GPS antennas

Effect of polymeric properties on the operation of gel-type audio transducers

A novel design of a moving-coil transducer coupled with a low-hardness elastomer called “the gel surround” is presented in this thesis. This device is termed a “gel-type audio transducer”. The gel-type audio transducer has been developed to overcome the problems that conventional loudspeakers have suffered - that is, the problem with size of the audio device against the quality of sound at low frequency range. Therefore the research work presented herein aims to develop the “gel-type audio transducer” as a next-generation audio transducer for miniaturized woofers.The gel-type audio transducer consists of the magnetic and coil-drive plate assembly, and these parts are coupled by the gel surround. The transducer is driven by the electromagnetic conversion mechanism (a moving-coil transducer) and its output driving force can be greatly enhanced by applying the novel mechanism of the gel surround especially at low frequency range, resulting in the enhanced acoustic efficiency. The transducer can be attached to a stiff and light panel with both the optimized impedance matching and minimised wave collisions.The performance of the gel-type audio transducer is greatly influenced by the mass of the magnetic assembly and compliance of the “gel surround”. But as the size of the magnet and its weight have to be kept minimal for a miniaturisation of the device, the focus of the research is on the effect of the of the gel surround. As a result, the effect of the gel surround, made of the RTV (room-temperature vulcanising) silicone elastomer, TPE (thermoplastic elastomer), and the silicone foam, on generation of the output driving force, the energy transfer from the transducer to a panel to which the transducer is attached, and sound radiation from the vibrating panel, was investigated. This effect was studied by COMSOL multiphysics (FE analysis) and thereby, the simulated results were verified by experiments such as the laser scanning measurement, DMA (dynamic mechanical analyzer), and the acoustic test. Successful development of prototypes of the gel-type audio transducers, with an enhanced acoustic efficiency at reduced size and weight, was achieved. Implementation of the transducers into consumer applications was also demonstrated with their commercial values

13th Annual Review of Progress in Applied Computational Electromagnetics at the Naval Postgraduate School, Monterey, CA, March 17-21, 1997, Conference Proceedings Volumes I & II

Includes Volumes 1 &