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Antennas and Propagation Magazine, IEEE

Issue 3 • Date June 2012

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Displaying Results 1 - 25 of 68
  • [Front cover]

    Page(s): c1
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  • Table of contents

    Page(s): 3
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  • Information for Contributors

    Page(s): 4
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  • Magazine Staff

    Page(s): 5 - 6
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  • AP-S Officers and Administrative Committee

    Page(s): 7
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  • Feature Articles and Contributions Solicited

    Page(s): 7
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  • President's Message

    Page(s): 8 - 9
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  • Editor's comments

    Page(s): 8, 302 - 305
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  • Challenges with Optically Transparent Patch Antennas

    Page(s): 10 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1677 KB) |  | HTML iconHTML  

    In this paper, antennas made out of transparent conducting oxides (TCOs) are explored. The optical transparency of transparent conducting oxides is achieved through thin-film depositions on substrates. However, thin-film depositions create a new set of electrical challenges that require a full understanding of semiconductor physics. This work looks into the governing equations that limit light transmission, absorption, and reflection through a transparent conductor, along with the electrical conductivity and antenna efficiency of transparent-conducting-oxide thin-film patch antennas. View full abstract»

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  • The Effect of Mutual Coupling on the Nulling Performance of Adaptive Antennas

    Page(s): 17 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7684 KB) |  | HTML iconHTML  

    The effect of mutual coupling on the performance of adaptive antennas has been a topic of considerable interest for the last three decades. The general conclusion of the work reported in the open literature is that mutual coupling degrades the performance of adaptive antennas. We have carried out an in-depth study of the effects of mutual coupling on the performance of adaptive antennas. Our studies show that this conclusion is not entirely correct. Yes, one does need the in-situ array manifold to obtain the fixed response in the desired signal direction. Otherwise, adaptive weights can also suppress the desired signal. Note that for adaptive antennas based on minimizing the mean squared error between the array output and a locally generated reference signal, this is not an issue. However, mutual coupling between antenna elements hardly affects the nulling performance of adaptive antennas. In fact, in a given size aperture, as the number of antenna elements is increased, one obtains better nulling performance, irrespective of the increased mutual coupling between antenna elements. Also, as expected, for strong wideband interfering signals, one should carry out space-time adaptive processing (STAP). View full abstract»

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  • Using the physical structure of a passive aerodynamic attitude-stabilization system as a multi-frequency antenna on nano-satellites

    Page(s): 39 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5791 KB) |  | HTML iconHTML  

    The feasibility of using the physical structure of a passive aerodynamic attitude-stabilization system on a nano-satellite as a multi-frequency antenna is shown. Four metallic strips that deploy from the rear of the satellite provide drag torques that stabilize pitch and yaw. These metallic strips are simultaneously used as an antenna for radio communication. The antenna uses physical band-stop filters on the metallic strips to allow the antenna to resonate at different frequencies. An impedance-matching network provides a 50 ohm match to a single coaxial connector. Full-wave electromagnetic analyses of the complete antenna structure on a three-unit CubeSat are presented, together with measured results. View full abstract»

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  • Addendum

    Page(s): 49
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  • A Study of the Performance of Wireless Sensor Networks Operating with Smart Antennas

    Page(s): 50 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3857 KB) |  | HTML iconHTML  

    Wireless sensor networks (WSNs) have attracted a great deal of research interest during the last few years, with potential applications making them ideal for the development of the envisioned world of ubiquitous and pervasive computing. Energy and computational efficiency constraints are the main key issues when dealing with this type of network. The main research effort has been channeled towards routing and distributed processing, in order to achieve better quality of service (QoS) provisions, lower interference, and a lower power-consumption rate while data dissemination is carried out. The embedment of smart antennas on wireless-sensor nodes is proposed herein as an alternative and novel approach at the physical layer, with the potential for relieving traditional challenges faced by current wireless-sensor-network architectures. Studying the behavior of wireless sensor networks consisting of different types of antennas (omnidirectional or adaptive directional) yielded unexpectedly favorable results that improved the operation of networking systems of this type. In the test cases presented herein, the incorporation of smart antennas resulted in approximate improvements in the quality of service by 20%, the efficiency by 50%, the percentage of active nodes by 20%, and the energy consumption by 50%, depending on the simulation setup. View full abstract»

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  • Changes of Address or Delivery Problems

    Page(s): 67
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  • Getting the Magazine by Air Freight

    Page(s): 67
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  • Space-Curve Types of Distributions and Sources

    Page(s): 68 - 85
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    Space-curve types of distributions and electromagnetic sources are introduced in a Schwartz-Sobolev space setting, in a tutorial style. The features of the investigation are the derivation and employment of i) three line vector operators acting on a regular singular function; ii) distributional derivatives of first-order space-curve types of singularities; and iii) the distributional investigation of the electromagnetic field's behavior in the presence of first- and second-order (“free” and “polarized”) arbitrary and impulse-radiating space-curve types of sources. View full abstract»

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  • Some Electromagnetic Equivalence Theorems Unifi ed by a Single Theorem and Generalized to a Nonlinear Case

    Page(s): 86 - 99
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    Love's theorem, the induction theorem, and the physical equivalence theorem are combined into a single theorem, and then proven in terms of the previously known electromagnetic principles and theorems. From the proof, the new theorem is seen to be applicable even in the inhomogeneous and nonlinear case. We also suggest some procedures for utilization of the new theorem in practice, for engineers having little experience with the equivalence theorems. We demonstrate that the new theorem not only unifies the conventional equivalence theorems, but is also versatile in obtaining equivalent problems in alternative forms. Some forms of the equivalent problems established in examples do not exist in the literature. View full abstract»

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  • Fundamentals of Electromagnetic Units and Constants

    Page(s): 100 - 114
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    Measurements are fundamental to the advancement of knowledge. In turn, measurements in general need equations that relate measurable physical quantities. The requirement that measured results be widely understandable needs the employment of units, and hence constants. An understanding of the concept of units can thus be of significant help in appreciating the fundamentals of science. With this background, this paper discusses units within the overall context of measurements, and presents the fundamentals of electromagnetic units. The discussion naturally involves a consideration of the electromagnetic constants, namely ε0 (generally called the permittivity of free space), μ0 (generally called the permeability of free space), and c (the velocity of light). View full abstract»

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  • [Advertisement]

    Page(s): 115
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  • Summer AdCom Meeting Sunday, July 3, 2011 Spokane, WA [AP-S AdCom Minutes]

    Page(s): 116 - 126
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  • National Radio Science Meeting

    Page(s): 127 - 128
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  • Chapter News

    Page(s): 129 - 132
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1586 KB)  

    Some of our readers of this column have commented that many of our Chapters have been more active in the recent months. This may be due to the dedicated services of our Chapter officers around the world, and more financial resources made available from the Antennas and Propagation Society. It is hoped that this trend can continue, and more of our members may benefit from the technical and social activities local Chapters organize. View full abstract»

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  • A Note from the Distinguished Lecturers' Chair

    Page(s): 132
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  • IEEE AP-S Chapter and Joint Chapter Chairs

    Page(s): 133
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  • AP-S Distinguished Lecturer Program for 2011–2012

    Page(s): 134
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Aims & Scope

The IEEE Antennas and Propagation Magazine covers all areas relating to antenna theory, design, and practice.

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Meet Our Editors

Editor-in-Chief
W. Ross Stone