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Antennas and Wireless Propagation Letters, IEEE

Date 2013

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Displaying Results 1 - 25 of 447
  • Table of contents

    Page(s): C1 - 1799
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  • IEEE Antennas and Wireless Propagation Letters publication information

    Page(s): C2
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  • Editorial: Status of AWPL

    Page(s): 1 - 2
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  • Novel Dual-Frequency Microstrip Antenna With Narrow Half-Ring and Half-Circular Patch

    Page(s): 3 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (751 KB) |  | HTML iconHTML  

    A novel dual-frequency microstrip antenna is presented. The dual-frequency is generated through a half-ring structure and a half-circular patch element. The half-ring is narrower than the conventional ring antenna, and the parameters that decide the resonant frequency of the antenna are studied. Simulation and measurement results show that the proposed antenna works at 0.9 and 1.8 GHz. View full abstract»

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  • Small-Size Wideband Monopole With Distributed Inductive Strip for Seven-Band WWAN/LTE Mobile Phone

    Page(s): 7 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (956 KB) |  | HTML iconHTML  

    An on-board coupled-fed printed monopole with a distributed inductive shorted strip for seven-band operation covering the GSM850/900/1800/1900/UMTS2100/LTE2300/2500 bands in the mobile phone is presented. The presented antenna consists of a feeding strip and a distributed inductive shorted strip (formed by a printed distributed inductor and a simple shorted strip). By the coupled-fed excitation, the proposed antenna can generate multiple resonant modes at lower and upper bands for seven-band WWAN/LTE operation covering 824-960/1710-2690-MHz bands. The proposed antenna only occupies a size of 15 × 29 mm2 and is easily printed on the top of an FR4 substrate, which makes it suitable for practical mobile applications. The proposed antenna was fabricated and tested. Measured and simulated results are presented. View full abstract»

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  • A Novel Conformal Surface Current Technique for Large Problems Based on High-Performance Parallel FDTD Method

    Page(s): 11 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (815 KB) |  | HTML iconHTML  

    Solution of electrically large problems such as scattering and diffraction by large objects-e.g., missiles, ships, and aircraft-is of considerable interest today. The finite-difference time-domain (FDTD) method is a versatile tool that has been extensively applied to the solution of these large problems. However, since the FDTD algorithm usually works with a Cartesian grid, it is not very well suited for extracting information on the induced current distribution on the surface of the object. Given this background, our objective in this letter is to describe a novel conformal technique, applied in conjunction with the high-performance parallel FDTD method, which extracts and displays the information of the surface on an arbitrarily shaped object in an accurate and efficient manner. Finally, some typical numerical examples are given to demonstrate the capability of our developed conformal technique. View full abstract»

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  • Implementation of Slotted Meander-Line Resonators for Isolation Enhancement in Microstrip Patch Antenna Arrays

    Page(s): 15 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (655 KB) |  | HTML iconHTML  

    A new approach to enhance the isolation in microstrip patch antenna arrays is described in this letter. The implementation of a slotted meander-line resonator (SMLR) is done by creating defect in the microstrip structure particularly designed for band-notch function. The resonator is designed to block the surface current at the resonant frequency of the two patch antennas coupled along H-plane and operating at a frequency of 4.8 GHz. The interelement isolation before and after the implementation of SMLR has been investigated. The proposed configuration provides an improvement in isolation by 16 dB (measured value) with a reduced edge-to-edge spacing of 7 mm (λo/9). The configuration has been designed, simulated, and validated experimentally. View full abstract»

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  • A Planar WWAN/LTE Antenna for Portable Devices

    Page(s): 19 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (974 KB) |  | HTML iconHTML  

    A Wireless Wide Area Network (WWAN) and Long Term Evolution (LTE) eight-band antenna for portable wireless devices is proposed, which consists of a direct-fed monopole with a chip inductor, a grounded strip, and a coupled-fed monopole with a distributed inductor. The fundamental modes of these three components form a low operating band from 0.66 to 1.03 GHz. The higher modes of the grounded strip and coupled-fed monopole create a high operating band from 1.7 to 2.87 GHz. Based on the 6-dB return loss, the two wide operating bands can be employed in LTE 700/GSM 850/900/1800/1900/UMTS/LTE 2300/2500 applications. The proposed antenna having dimensions 75×10×0.8 mm3 is appropriate for the top edge of a tablet computer. A 200×260 mm2 copper plate, which is about the size of a 13-in screen plate, is used as the system ground plane. View full abstract»

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  • Resonant-Type Antennas Loaded With CRLH Unit Cell

    Page(s): 23 - 26
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1003 KB) |  | HTML iconHTML  

    The concept of loading monopole antennas with composite right/left-handed (CRLH) unit cell is extended to cover other types of resonant antennas, namely loop antennas and printed inverted-F antennas (printed IFAs). By adding one unit cell, these antennas achieve three operating bands while having their sizes unmodified. The new frequencies are lower than the unloaded antenna's nominal frequency. The printed IFA is fabricated, and measurements are consistent with theoretical predictions. View full abstract»

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  • Planar Meander Monopole Antenna With Parasitic Strips and Sleeve Feed for DVB-H/LTE/GSM850/900 Operation in the Mobile Phone

    Page(s): 27 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (838 KB) |  | HTML iconHTML  

    The design and wideband performance of a planar meander monopole antenna in the mobile phone is presented. By using parasitic strips and a sleeve feed, wideband impedance characteristics are achieved. A measured impedance bandwidth for VSWR ≤3 of about 101.7% ranging from 440 to 1350 MHz is obtained. It is very suitable for DVB-H, LTE 13, GSM850, and GSM900 applications in the mobile phone. View full abstract»

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  • On MLMDA/Butterfly Compressibility of Inverse Integral Operators

    Page(s): 31 - 34
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    The multilevel matrix decomposition algorithm (MLMDA) is shown to permit effective compression of inverse integral operators pertinent to the analysis of scattering from electrically large structures. Observed compression ratios exceed those realized by low-rank (LR) compression methods, leading to substantial memory savings and a faster application of the inverse operator, and suggesting a new application for schemes traditionally used for compressing forward integral operators. View full abstract»

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  • RCS of a Microstrip Leaky-Wave Antenna

    Page(s): 35 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (545 KB) |  | HTML iconHTML  

    The monostatic radar cross section (RCS) of a microstrip leaky-wave antenna (MLWA) is investigated. Both full-wave simulation and laboratory measurement are carried out to characterize its RCS as a function of frequency and aspect angle. Three distinct scattering features in the range-aspect plane are observed. By modeling the scattering mechanisms individually, the observed features can be clearly identified as the primary antenna mode scattering, higher-order bounce antenna mode scattering and structural mode scattering. The unique range-extended return due the antenna mode scattering is further interpreted using a time-of-arrival ray picture. It is shown that the extended range delay is directly attributable to the continuous aperture of the MLWA and the frequency-dependent group velocity of the leaky wave. View full abstract»

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  • Two-Step Method for the FDTD Analysis of Long Apertures Having Depth

    Page(s): 39 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (787 KB) |  | HTML iconHTML  

    In this letter, a two-step method has been proposed for the finite-difference time-domain (FDTD) analysis of long apertures having depth. The first step is to obtain the field distribution near the slot from a simple two-dimensional high-resolution FDTD simulation of the aperture areas, and then the field distribution is fully cast into the Yee cell to derive a slot integral coefficient. At the second step, the coefficient is applied to the cells containing the aperture with the contour path law to derive the slot updating equations. The validity of the proposed method has been approved from checking the accuracy of the field distribution of the first step and the slot coupling result. It is demonstrated the method presented here is stable and numerically and computationally efficient . View full abstract»

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  • Low-Profile Substrate-Integrated Lens Antenna Using Metamaterials

    Page(s): 43 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (750 KB) |  | HTML iconHTML  

    A low-profile substrate-integrated lens antenna is designed using planar metamaterials for a broadband operation. The lens antenna is based on embedding a Vivaldi antenna source inside a parallel-plate waveguide to illuminate a half Maxwell fish-eye (HMFE) lens operating in X-band. The focusing condition of the lens, requiring a gradient refractive index is achieved through the use of complementary nonresonant metamaterial structures. Numerical simulations are performed to determine the suitable unit cells geometry with respect to the wave launcher inserted into the parallel-plate waveguide. The electric field distribution inside the antenna system has also been explored numerically. Far-field radiation patterns have been measured on a fabricated prototype in an anechoic chamber. It has been shown from both near- and far-field plots that the proposed planar antenna presents good focusing properties. View full abstract»

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  • Radiation Improvement From a Very Narrow Slotline Using a Short-Ended Double Spur-Line

    Page(s): 47 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (647 KB) |  | HTML iconHTML  

    In this letter, a simple design to improve an antenna radiation performance by adding a matching network consisting of short-ended double spur-line is proposed. By inserting a short-ended double spur-line in the slotline and connecting it with a ground plane, a parallel resonance with a bandpass characteristic occurs, and the characteristic impedance of the very narrow slotline is close to the impedance of free space. To verify this characteristic, an equivalent circuit model is presented to offer a detailed explanation, and the comparisons between the simulated and measured results are demonstrated. View full abstract»

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  • Rain Fade Slope Model in Satellite Path Based on Data Measured in Heavy Rain Zone

    Page(s): 50 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (647 KB) |  | HTML iconHTML  

    Rain fade slope has been measured in Kuala Lumpur, Malaysia, located in heavy rain zone. The data were collected from MEASAT3 with elevation angle of 77.4° at a frequency of 10.982 GHz with several time interval lengths. The measured fade slope was compared to the ITU-R P.1623 model. Tendency of probability distribution model and measured data is discrepant, and leading estimation of fade slope is inaccurate. Dominant parameters to the model are analyzed and proposed for the link. Modification of fade slope model has been proposed based on data with different time interval lengths' effects. View full abstract»

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  • Identification of Multiple Objects Using Their Natural Resonant Frequencies

    Page(s): 54 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (705 KB) |  | HTML iconHTML  

    A methodology for identification of multiple objects using their natural resonant frequencies is presented. This methodology is then applied to generate a library of poles of various objects in the frequency domain and compare them to the computed natural poles of unknown objects using the typical transient temporal late time response in the time domain. The Cauchy method is applied directly in the frequency domain to extract the Singularity Expansion Method (SEM) poles, and thus a library of poles of various perfectly conducting objects (PEC) is generated. The Matrix Pencil (MP) method is then applied to the late time response to compute the SEM poles for identification in the time domain. Simulation examples are analyzed to illustrate the potential of this proposed methodology. View full abstract»

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  • An Efficiently Preconditioned Eigenanalysis of Inhomogeneously Loaded Rectangular Cavities

    Page(s): 58 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (809 KB) |  | HTML iconHTML  

    In this letter, we demonstrate an efficient preconditioning scheme for the eigenanalysis of inhomogeneously loaded rectangular cavities. Modeling the entire structure with the finite-difference frequency-domain (FDFD) method yields a large sparse eigenvalue problem. The desired interior eigen-spectrum is sought for by Arnoldi iterations with the shift-and-invert operation, where the inversion can only be performed iteratively in large-scale applications. A preconditioner is constructed to speed up the inversion. It can effectively shrink the spectrum of the governing matrix and can be solved for by using fast discrete sine and cosine transforms (DSTs and DCTs). Several numerical examples are included to illustrate the efficiency of the preconditioned eigenanalysis. View full abstract»

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  • Series-Fed Microstrip Antenna Array With Inclined-Slot Couplers as Three-Way Power Dividers

    Page(s): 62 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (906 KB) |  | HTML iconHTML  

    A novel approach to the design of series-fed antenna arrays has been presented, in which a modified three-way slot power divider is applied. In the proposed coupler, the power division is adjusted by changing the slot inclination with respect to the transmission line, whereas coupled transmission lines are perpendicular. The proposed modification reduces electrical length of the feeding line to 1 λ, hence results in dissipation losses' reduction. The theoretical analysis and measurement results of the 2 × 8 microstrip antenna array operating within 10.5-GHz frequency range are shown in the letter, proving the novel inclined-slot power divider's capability to provide appropriate power distribution and its potential application in the large antenna arrays. View full abstract»

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  • A Compact Printed Antenna for Triple-Band WLAN/WiMAX Applications

    Page(s): 65 - 68
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (707 KB) |  | HTML iconHTML  

    In this letter, a novel compact printed antenna for triple-band WLAN/WiMAX applications is presented. The proposed antenna consists of three simple circular-arc-shaped strips, whose whole geometry looks like “ear” type. By adjusting the geometries and the sizes of these three circular-arc-shaped strips, three different resonance modes can be effectively created for three distinct frequency bands, respectively. The overall dimension of the proposed antenna can reach 18 × 37 × 1 mm3 . Measured results show that the presented antenna can cover three separated impedance bandwidths of 400 MHz (2.38-2.78 GHz), 480 MHz (3.28-3.76 GHz), and 1000 MHz (4.96-5.96 GHz), which are well applied for both 2.4/5.2/5.8-GHz WLAN bands and 2.5/3.5/5.5-GHz WiMAX bands. View full abstract»

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  • Electric Split-Ring Resonator Based on Double-Sided Parallel-Strip Line

    Page(s): 69 - 71
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (508 KB) |  | HTML iconHTML  

    A new electric split-ring resonator (ESRR) specialized for the double-sided parallel-strip line (DSPSL) is proposed. Adding a DSPSL swap to a split-ring resonator (SRR), its magnetic response becomes electrical, which is explained by even- and odd-mode analysis and resonant current distribution. Loading in a line with a series gap, it behaves similarly to the previously well-studied complementary SRR. ESRR may be useful in the design of novel DSPSL-based antennas and microwave components. View full abstract»

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  • RF MEMS Reconfigurable Two-Band Antenna

    Page(s): 72 - 75
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (884 KB) |  | HTML iconHTML  

    The design methodology, analysis, and characterization of a radio frequency microelectromechanical systems (RF MEMS)-based reconfigurable antenna operating in the United States Public Safety bands are presented. It has two modes of operation with central frequencies of 718 and 4960 MHz, providing a high reconfigurable frequency ratio of ~7. This antenna is electrically small with lateral dimensions being ~λ/10 × λ/10 at 718 MHz. The reconfigurability between the modes is achieved by a single RF MEMS switch, which enables changing the length of the current flow path, thereby the resonance frequency is changed. The measurement results for impedance and radiation characteristics of the fabricated antenna prototype agree well with the simulations. The measured bandwidths of the antenna are 2.6% and 7.6% at 718 and 4960 MHz, respectively. View full abstract»

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  • Utilizing Wideband AMC Structures for High-Gain Inkjet-Printed Antennas on Lossy Paper Substrate

    Page(s): 76 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB) |  | HTML iconHTML  

    Significant gain and bandwidth improvement of inkjet-printed antennas with integrated artificial magnetic conductor (AMC) is achieved by utilizing wideband ground-backed frequency selective surfaces (FSSs) to overcome the high losses of organic substrates such as paper. A microstrip-fed monopole mounted on an artificial magnetic conductor is demonstrated to improve the gain by 5 dB over previous works and exhibit much wider impedance bandwidth while maintaining a thin antenna profile and a 20% electrical size reduction. The effect of AMC bandwidth on substrate losses and the gain reduction caused by finite AMC array effects are investigated in an effort to produce high-gain, miniaturized, low-cost wearable and structure mount antennas. View full abstract»

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  • Broadband Direction-Finding Antenna Using Suspended Microstrip-Line Hybrid Coupler for Handheld Devices

    Page(s): 80 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (683 KB) |  | HTML iconHTML  

    A compact, wideband, vertically polarized two-element sum/difference antenna with a suspended microstrip-line hybrid coupler is proposed, designed, fabricated, and measured. The antenna array has two independent ports that provide the sum and difference pattern. Therefore, it gives opportunity to detect the direction of an unwanted signal by comparing the signal levels. The simulated and measured results show that the antenna bandwidth where S11 below -10 dB for both sum and difference ports is between 2.4 and 4 GHz. The isolation between the sum and difference ports is measured better than 14.5 dB. These features result in a wideband and compact sum/difference antenna-coupler mechanism, which is suitable for handheld terminal applications of unwanted signal detection. View full abstract»

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  • Design Guidelines for a Terahertz Silicon Micro-Lens Antenna

    Page(s): 84 - 87
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (836 KB) |  | HTML iconHTML  

    A silicon lens antenna suited for future integrated terahertz arrays has been proposed recently. The antenna consists of an extended hemispherical silicon lens fed by a leaky-wave waveguide feed. The primary advantage is that the antenna is compatible with silicon micro-fabrication techniques as only a small sector of the lens is actually used. Moreover, it can be easily integrated with other silicon micromachined front-end components. In this letter, the design and optimization details of such a micro-lens antenna is presented. The design is validated with a set of measurements at 550 GHz from a prototype that has been fabricated using laser micro-fabrication. View full abstract»

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Aims & Scope

IEEE Antennas and Wireless Propagation Letters is devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Yang Hao
School of Electronic Engineering and Computer Science
Queen Mary College, University of London