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Antennas and Propagation Magazine, IEEE

Issue 1 • Date Feb. 2013

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Displaying Results 1 - 25 of 81
  • [Front cover]

    Publication Year: 2013 , Page(s): c1
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  • [Advertisement]

    Publication Year: 2013 , Page(s): c2
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  • Table of contents

    Publication Year: 2013 , Page(s): 3 - 4
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  • Information for contributors

    Publication Year: 2013 , Page(s): 5
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  • Magazine Staff

    Publication Year: 2013 , Page(s): 6 - 9
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  • AP-S Officers and Administrative Committee

    Publication Year: 2013 , Page(s): 10
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  • Feature Articles and Contributions Solicited

    Publication Year: 2013 , Page(s): 10
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  • President's message

    Publication Year: 2013 , Page(s): 11 - 12
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  • Design of Chipless UWB RFID System Using A CPW Multi-Resonator

    Publication Year: 2013 , Page(s): 13 - 31
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (9189 KB) |  | HTML iconHTML  

    In this paper, the design of a novel chipless ultra-wideband radio-frequency identification (UWB RFID) system is proposed. The system employs printable uniplanar chipless tags and a pair of high-gain reader antennas. The chipless tag is composed of two UWB monopole antennas, connected by a coplanar waveguide (CPW). The tag's ID is represented by a spectral signature in the UWB frequency range, and is created by a multi-resonator embedded on the coplanar waveguide. The detection of the tag's ID is based on using only the amplitude of the spectral signature, which significantly simplifies the complexity of detection. The reader employs two separate Vivaldi antennas - one for transmitting a vertically polarized signal, and the other for receiving a horizontally polarized signal - to reduce the mutual coupling between the uplink and downlink signals. Further reduction of mutual coupling is achieved by using a copper plate at the reader to separate the uplink and downlink signals. These two proposed methods together reduced the mutual coupling by 20 dB. The chipless RFID tag with eight coplanar waveguide resonators in a group and the reader antennas were designed using computer simulation, and fabricated on Rogers substrates for measurement. The results of studies in an anechoic chamber showed that the proposed UWB RFID system could achieve a reading range of larger than 30 cm, at least three times longer than the maximum distance of a similar system reported by others. This indicated that the proposed system has great potential for short-range item tracking at low cost. View full abstract»

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  • AP-S Election Results

    Publication Year: 2013 , Page(s): 31
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  • Changes of Address or Delivery Problems

    Publication Year: 2013 , Page(s): 31
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  • Implementation of an Antenna Array for Satellite Communications with the Capability of Canceling Jammers

    Publication Year: 2013 , Page(s): 32 - 48
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7062 KB) |  | HTML iconHTML  

    This paper introduces an anti-jamming technology for satellite communication that can cancel terrestrial jammers. In this paper, we first consider the Conjugate Gradient Method (CGM) as the first adaptive algorithm. Using this method, the attainment of the depth of the nulls and the rate of convergence are shown to be excellent. We also introduce a second novel adaptive algorithm, the hardware complexity of which for real-time implementation remains within the capacity of an off-the-shelf serial processor. A simulator based on the proposed adaptive algorithms is then illustrated to verify the performance of an adaptive system designed for implementation on a geostationary satellite. Finally, we demonstrate a hardware implementation of the adaptive system for canceling terrestrial jammers. Detailed hardware descriptions of an implemented adaptive system - such as the antenna array module, the beamforming module, and the controller module - are illustrated, along with the results of the performance obtained in laboratory tests. View full abstract»

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  • Reconfigurable Antennas

    Publication Year: 2013 , Page(s): 49 - 61
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3057 KB) |  | HTML iconHTML  

    Reconfigurable antennas change polarization, operating frequency, or far-field pattern in order to cope with changing system parameters. This paper reviews some of the past and current technology applicable to reconfigurable antennas, with several examples of implementations. Mechanically movable parts and arrays are discussed, as well as more-recent semiconductor-component and tunable-material technologies applicable to reconfigurable antennas. View full abstract»

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  • Theoretical Methods for the Impedance and Bandwidth of the Thin Dipole

    Publication Year: 2013 , Page(s): 62 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7563 KB) |  | HTML iconHTML  

    The dipole is the fundamental elemental antenna, and the wire electric dipole and its monopole equivalent are still widely used in practice. Despite the long history of dipole research, its complete impedance behavior remains elusive, because of long-standing shortfalls in modeling the feed. The available analytic approaches are the wave-structure method and the induced-EMF method. The wave-structure method does not lend itself to feed-gap detail. However, it reveals the impact of the dipole's thickness and length on the impedance of dipoles, which is not readily available from other approaches. The method is restricted to an infinitesimal feed gap, i.e., different from a practical dipole antenna. The induced-EMF method is accurate for short and impracticably thin (for self-supporting) wire antennas. Numerical techniques can be used for practical dipole thicknesses, but no theory is available to benchmark the results. Here, the induced-EMF method with a finite feed gap is solved, and the impedance of the thin dipole is presented. The bandwidth is the critical parameter, and other methods are also applied for calculating the theoretical bandwidth. It is of particular interest that the lossless, thin dipole with a finite gap is a structure that has an extremely wide bandwidth. This paper includes a brief review of previous work to acknowledge the rich history and provide context for current research. However, it mostly presents new analysis and new impedance-bandwidth results for a range of dipole lengths. View full abstract»

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  • Getting the Magazine by Air Freight

    Publication Year: 2013 , Page(s): 81
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  • Spherical-wave and plane-wave propagators

    Publication Year: 2013 , Page(s): 82 - 91
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2832 KB) |  | HTML iconHTML  

    This paper explores the equivalence between spherical-wave and plane-wave propagators. Spherical-wave propagators are intimately part of diffraction and boundary scattering theory. They consequently are used almost exclusively in introductory presentations of electromagnetic theory. However, equivalent representations can be constructed from superpositions of propagating plane waves. This leads to two different approaches to diffraction theory. Spherical-wave computations are initiated by induced point sources. Plane-wave computations are initiated by an equivalent-aperture plane field. Subsequent propagation can be computed with Fourier transformations. Sampling requirements ultimately limit the utility of Fourier-domain computations. Examples are presented. View full abstract»

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  • [Advertisement]

    Publication Year: 2013 , Page(s): 91
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  • Accurate Evaluation of Green's Functions for a Lossy Layered Medium by Fast Extraction of Surface- and Leaky-Wave Modes

    Publication Year: 2013 , Page(s): 92 - 102
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2655 KB) |  | HTML iconHTML  

    In this paper, a method based on consecutive perturbation for the fast and accurate extraction of all useful surface- and leaky-wave modes for a lossy layered medium is proposed. The algorithm consists of two perturbation stages. In the first stage, according to the relationship for the frequency variation between the surface- and leaky-wave modes, the leaky-wave modes for a lossless medium can be tracked by consecutive frequency perturbation, with the surface-wave modes at a proper high frequency as starting points. All the surface-wave modes are extracted by a modified dichotomy method. In the second stage, a consecutive loss perturbation is performed, in which the medium's loss is increased step by step. In each perturbation step of both of the two stages, Newton-Raphson iterations are employed to update the modes on the corresponding Riemann sheet. With these discrete modes accurately extracted, a combination of the Discrete Complex-Image Method (DCIM) and the All-Modes Method can be realized for accurate evaluation of the Green's functions in the near-field and non-near-field regions, respectively. Several numerical examples demonstrated the high accuracy and efficiency of this method. View full abstract»

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  • Review of Rain Attenuation Studies in Tropical and Equatorial Regions in Malaysia: An Overview

    Publication Year: 2013 , Page(s): 103 - 113
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    Rain is a major source of attenuation for microwave propagation above 10 GHz. In tropical and equatorial regions, the rain intensity is high. Therefore, designing terrestrial and Earth-to-satellite microwave links is very critical and challenging. The raindrop-size distribution and the rain-rate distribution are two important parameters used for attenuation prediction. Both are proposed based on measured data and the rain-rate conversion technique. In this paper, rain attenuation was directly measured at different frequencies for terrestrial and Earth-to-satellite links, in order to investigate prediction models. The reduction factor and frequency scaling were investigated and proposed to predict total attenuation. Worst-month and annual statistics were also analyzed, based on measurements. Moreover, this paper summarizes all contributions related to rain-caused attenuation for microwave propagation in Malaysia's tropical climate. View full abstract»

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  • In Memoriam: Mario Sorolla Ayza

    Publication Year: 2013 , Page(s): 114 - 115
    Cited by:  Papers (1)
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  • Chapter News

    Publication Year: 2013 , Page(s): 116 - 120
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  • A Note from the Distinguished Lecturers' Chair

    Publication Year: 2013 , Page(s): 120
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  • IEEE AP-S Chapter and Joint Chapter Chairs

    Publication Year: 2013 , Page(s): 121
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  • AP-S Distinguished Lecturer Program

    Publication Year: 2013 , Page(s): 122 - 123
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  • In Memoriam: Doren W. Hess

    Publication Year: 2013 , Page(s): 124
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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
Mahta Moghaddam