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Antennas and Wireless Propagation Letters, IEEE

Volume 9: 2010

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Displaying Results 1 - 25 of 339
  • Blank page

    Publication Year: 2010 , Page(s): C3 - C4
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    Freely Available from IEEE
  • IEEE copyright form

    Publication Year: 2010 , Page(s): 1355 - 1356
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    Freely Available from IEEE
  • Advertisement - IEEE Foundation

    Publication Year: 2010 , Page(s): 1354
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    Freely Available from IEEE
  • 2010 Index IEEE Antennas and Wireless Propagation Letters Vol. 9

    Publication Year: 2010 , Page(s): 1292 - 1342
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    Freely Available from IEEE
  • 2010 List of Reviewers

    Publication Year: 2010 , Page(s): 1287 - 1291
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  • Correction to “A Singly Fed Rectangular Dielectric Resonator Antenna With a Wideband Circular Polarization” [2010 615-618]

    Publication Year: 2010 , Page(s): 1286
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (78 KB) |  | HTML iconHTML  

    In the above titled letter (ibid., vol. 9, pp. 615-618, 2010), the authors have reported a singly fed rectangular dielectric resonator with a circular polarization bandwidth of 14%. This is incorrect owing to an error in processing the computed and measured axial ratio data. As a result, Fig. 4 needs to be replaced by the figure presented here, which illustrates a 3-dB axial ratio bandwidth of 7%. The conclusions remain valid as the achieved bandwidth is still significantly higher than the typical bandwidths of less than 3% for singly fed rectangular dielectric resonator antennas. View full abstract»

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  • Correction to “Time-Domain UTD-PO Analysis of a UWB Pulse Distortion by Multiple-Building Diffraction” [2010 795-798]

    Publication Year: 2010 , Page(s): 1285
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (61 KB)  

    In the above titled paper (ibid., vol. 9, pp. 795-798, 2010), some text requires revision and another reference should be added. These changes are presented here. View full abstract»

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  • Correction to "Compact Differentially Fed Inverted Microstrip Circular Patch With an Integrated Coupler" [2010 627-630]

    Publication Year: 2010 , Page(s): 1285
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (61 KB)  

    In the above titled paper (ibid., vol. 9, pp. 627-630, 2010), the y-axis nomenclature of Fig. 3 is incorrect. The corrected figure is presented here. View full abstract»

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  • Correction to “Path-Loss and Time-Dispersion Parameters of UWB Signals in a Military Airplane” [2009 790-793]

    Publication Year: 2010 , Page(s): 1285
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (61 KB)  

    In the above titled paper (ibid., vol. 8, pp. 790-793, 2009), the following error was made: On p. 792, right column, the fifth line of the second paragraph should read "for a threshold value of 70 db." View full abstract»

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  • Comments on “Numerical Study of Microwave Scattering in Breast Tissue via Coupled Dielectric and Elastic Contrasts”

    Publication Year: 2010 , Page(s): 1283 - 1284
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB) |  | HTML iconHTML  

    The article comments on the original article by M.Zhao et al, which presented the numerical analysis of microwave scattering in breast tissue via coupled dielectric and elastic contrasts. Fuqiang et al claim that some validations were incorrect and present amended versions. View full abstract»

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  • Reply to “Comments on “A High-Gain Antenna Consisting of Two Slot Elements With a Space Larger Than a Wavelength””

    Publication Year: 2010 , Page(s): 1280 - 1283
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (85 KB) |  | HTML iconHTML  

    First, the authors want to state the importance of slot dipole resonance in the design of light and thin waveguide-end arrayed slots antenna once again. The arrayed slots antenna flanked with grooves is based on the slot dipole resonance and offers the advantage of low profile reaching about 1/4 wavelength, which is much smaller, which has a thickness larger than 1/2 wavelength. This point was proved in Beruete et al.'s latter work. Furthermore, arrayed slots antenna with grooves not only realizes beaming effect in the E-plane, but also helps to achieve the narrow beam in the H-plane. These results are the main topics and originalities of our work are not embodied in Beruete et al.'s work. View full abstract»

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  • Comments on “A High-Gain Antenna Consisting of Two Slot Elements With a Space Larger Than a Wavelength”

    Publication Year: 2010 , Page(s): 1279 - 1280
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (46 KB) |  | HTML iconHTML  

    This paper presents a comment on the paper titled " a high gain antenna consisting of two slot elements with a space larger than a wavelength". It is observed that both slot resonances have similar current distribution and demonstrated that gain can be enhanced using any of them. Thus, implicit in this approach is that the study of the saturation of gain with the number of grooves could be applied to any of those resonances. View full abstract»

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  • Optimization of Printed Yagi Antenna Using Invasive Weed Optimization (IWO)

    Publication Year: 2010 , Page(s): 1275 - 1278
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (345 KB) |  | HTML iconHTML  

    In this letter, the Invasive Weed Optimization (IWO) method is applied to design and optimize a printed Yagi antenna. The optimization goals are set to reach an antenna with a VSWR less than 1.5 and a high-gain radiation pattern. The fitness function is calculated by FEKO, which uses the method of moments for evaluating the structures. By implementing this simple closed-loop algorithm, the best available structure has been achieved compared to the results of the previous studies. Finally, a C-band optimized version of the antenna is fabricated and tested. The experimental data are in good agreement with the simulation results, which verifies the performance of the IWO method. View full abstract»

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  • A Type of Planar Array-Antenna Feeding Network With Single/Multiband Filtering Capability

    Publication Year: 2010 , Page(s): 1271 - 1274
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (489 KB) |  | HTML iconHTML  

    A dual-function circuit carrying out both the RF power-division and single/multiband filtering action is presented. It is used as building element to develop highly frequency-selective power-distribution networks for planar array-type antennas. The operating principle of this filtering/feeding circuit, exploiting transversal signal-interference techniques, is described. Also, formulas and guidelines helping in its theoretical design are given. As proof of concept, microstrip prototypes of four-way single- and triple-band filtering/feeding networks are built and tested. View full abstract»

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  • Spherical Vector Wave Method for Analysis and Design of MIMO Antenna Systems

    Publication Year: 2010 , Page(s): 1267 - 1270
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    In this letter, spherical vector wave approach is employed to investigate the electromagnetic aspects of multiple-input-multiple-output (MIMO) antennas. The correlation coefficient is introduced as the design and optimization criterion, and a systematic approach is proposed for MIMO antenna analysis and design. The proposed method is utilized to maximize the system capacity for the given MIMO antenna structure. View full abstract»

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  • Characterization of Ultrawideband Antennas Using Noise

    Publication Year: 2010 , Page(s): 1263 - 1266
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (677 KB) |  | HTML iconHTML  

    The theory of antenna measurement will be presented using noise, and a comparison to ultrawideband (UWB) frequency-domain method will be given. Experimental results will show that the noise method of antenna measurement and vector network analyzer (VNA) method are the same. The approach using the noise method provides a low-cost alternative to the frequency-domain method. View full abstract»

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  • Blind Calibration for a Linear Array With Gain and Phase Error Using Independent Component Analysis

    Publication Year: 2010 , Page(s): 1259 - 1262
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (177 KB) |  | HTML iconHTML  

    A novel gain and phase blind calibration method for a linear array with non-Gaussian sources is proposed. In the proposed method, independent component analysis is used to estimate the product of the array error matrix and the array response matrix. From this estimated matrix, the array gain and phase are estimated in the sense that the squared estimation error of the direction of arrivals (DOAs) of the sources can be minimized. Simulation results demonstrate that the proposed method is superior to conventional methods for a wide range of phase error. View full abstract»

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  • Compact, Low-Cost, Surface-Mount Active Antenna

    Publication Year: 2010 , Page(s): 1255 - 1258
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (540 KB) |  | HTML iconHTML  

    A very simple surface-mount dual-polarized active antenna module consists of up/down converter ICs mounted directly on top of a patch antenna radiator. By incorporating ICs on the patch surface, the design saves space, an important feature in phased arrays where wide scanning range requires half-wave spacing. The module is fabricated on a soft substrate and contains only one dielectric layer, no cutouts, and no blind vias. Measurements of both single- and dual-polarized 10-GHz prototypes show a normal copolarized radiation pattern and less than - 12 dB of cross polarization. View full abstract»

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  • Analytically Expressed Dispersion Diagram of Unit Cells for a Novel Type of Holographic Surface

    Publication Year: 2010 , Page(s): 1251 - 1254
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (503 KB) |  | HTML iconHTML  

    A novel type of surface-impedance modulation mechanism for designing of microstrip-technology-based surface-wave-excited holographic antennas is proposed. The advanced radiating geometry consists of quasi-periodic arrangement of unit cells operating in the leaky-wave region. Flexible design requires a considerable numerical effort determining the dispersion characteristics of any possible unit cell present in the geometry. In this context, an analytic determination of the dispersion diagram for a unit cell with a sinusoidal modulation of the effective dielectric constant in its inside is presented. In this particular case, the solution is expressed in terms of Mathieu functions. The good agreement between numerical data and analytic solutions for an open, unbounded microstrip structure allows introducing the principle of a novel type of holographic surface obtained by cascading unit cells with different modulation parameters, where the phase of the radiating field can be geometrically controlled. View full abstract»

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  • A Small Broadband Folded-Loop Antenna With Disk-Loaded Monopole

    Publication Year: 2010 , Page(s): 1248 - 1250
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB) |  | HTML iconHTML  

    A small broadband folded-loop antenna with a disk-loaded monopole is designed and measured. Its size is 0.08 λ × 0.1 λ × 0.1 λ at the center frequency of 1.5 GHz. The measured fractional bandwidth is 11.2% with the voltage standing-wave ratio (VSWR) less than 2. It has an omnidirectional radiation pattern of vertical polarization in the horizontal plane. View full abstract»

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  • Modeling of ESD-Induced Ultrawideband Noise Propagating on the Human Body

    Publication Year: 2010 , Page(s): 1245 - 1247
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (310 KB) |  | HTML iconHTML  

    Impulsive electromagnetic waves are produced when a grounded human touches a conducting object with different potential. An experimental setup was designed to measure electromagnetic fields on humans caused by sparks. The measured and computed waveforms are in good agreement. Specifically, measured and computed rise times of a discharge current were approximately 100 ps for a charge voltage of 1 kV. The generated electromagnetic pulses were distorted and dissipated with propagation due to dispersive characteristics of the biological tissues and multireflection in the human body. Computational results suggest that the pulse propagates over the body and is emitted from the top of the head in 10 ns. View full abstract»

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  • An Electronically Tunable Single-Layer Reflectarray Antenna Element With Improved Bandwidth

    Publication Year: 2010 , Page(s): 1241 - 1244
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (446 KB) |  | HTML iconHTML  

    This letter presents a varactor diode-tuned reflectarray element that achieves an improved element phase bandwidth relative to designs that employ a single resonance for phase tuning. This is accomplished by introducing two resonances in the element while maintaining a single-layer structure. Simulation results based on full-wave simulations compare favorably to experimental measurements inside a waveguide. The unit cell exhibits over 380° of phase agility, 3.5 dB of peak cell loss, and a 2.4% phase bandwidth at 5.4 GHz. In addition, it has the attractive features of using only a single control voltage as well as having a quasi-linear phase versus voltage characteristic. View full abstract»

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  • A Novel Colocated Cross-Polarized Two-Loop PCB Antenna in the ISM 2.4-GHz Band

    Publication Year: 2010 , Page(s): 1237 - 1240
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1330 KB) |  | HTML iconHTML  

    This letter outlines the design of a colocated cross-polarized two-loop antenna for the ISM 2.4-GHz band. This antenna may be of interest to radar applications in the problem of finding the direction of arrival of a signal and in wireless applications that exploit polarization diversity. This antenna is an initial result toward the design of an electromagnetic vector sensor. View full abstract»

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  • Frequency-Tunable Waveguide Antenna With Miniaturized Aperture Using a Varactor-Loaded Split-Ring Resonator

    Publication Year: 2010 , Page(s): 1233 - 1236
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    We propose a frequency-tunable waveguide antenna with a size-reduced aperture. Up to now, waveguide antennas with split-ring resonators have exhibited narrow-frequency bandwidths. To expand the operating frequency band, the resonant frequency of a split-ring resonator is tuned by adjusting the capacitance of the gap. A capacitor-loaded split-ring resonator is simulated and experimentally tested to validate its performance, and a varactor-loaded split-ring resonator is then investigated. The effective capacitance of the varactor-loaded split-ring resonator is changed by varying the external dc voltage. The tunable frequency range extends from 1.96 to 2.36 GHz (a fractional frequency range of 18.5%). The simulations and experiments yield good results for the reflection coefficient, radiation pattern, and gain. The proposed antenna retains the 70% aperture reduction of previously developed split-ring-resonator-loaded waveguide antennas. View full abstract»

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  • Strain Imaging of the Breast by Compression Microwave Imaging

    Publication Year: 2010 , Page(s): 1229 - 1232
    Cited by:  Papers (29)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    A method that uses microwave pulses to achieve strain imaging of the breast is presented. In the proposed method, the breast is inserted in an enclosure that defines the boundary conditions for the breast deformation under the influence of external pressure. The upper plate of the enclosure, which also includes an antenna array, is attached to a compression tool, whereas the lower and the front plates are fixed. The breast is allowed to extend in the lateral direction when pressed by the top plate. Each of the antennas at the top plate is used to send an ultrawideband pulse to penetrate the breast and measure the backscattered pulse. Two sets of measurements are taken: one pre- and another post-compression of the breast. A sliding window of cross correlation is then performed on the two sets of data to establish the time delay of each segment of the scattered pulse due to compression. That time delay is then employed to get a three-dimensional strain image of the breast. As lesion tissue is typically much stiffer than normal breast tissue, then regions of low or zero strain indicate areas in need of further diagnostic checks. Full-wave simulations are used to validate the presented imaging method. 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.

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Meet Our Editors

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