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Antennas and Wireless Propagation Letters, IEEE

Volume 4: 2005

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Displaying Results 1 - 25 of 141
  • IEEE Antennas and Wireless Propagation Letters blank page

    Publication Year: 2005 , Page(s): c4
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  • IEEE Antennas and Wireless Propagation Letters blank page

    Publication Year: 2005 , Page(s): c3
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  • IEEE copyright form

    Publication Year: 2005 , Page(s): 519 - 520
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  • 2005 Index

    Publication Year: 2005 , Page(s): 504 - 518
    Cited by:  Papers (1)
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  • 2005 Reviewers' List

    Publication Year: 2005 , Page(s): 498 - 499
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  • Reply to Dr. Hansen's Comments

    Publication Year: 2005 , Page(s): 497
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    The present authors reply to comments by Hansen on the original paper by Neto and Lee (IEEE Antennas Wireless Propag. Lett., vol.4, p.75-8, 2005). View full abstract»

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  • Comments on "'Infinite Bandwidth' Long Slot Array Antenna"

    Publication Year: 2005 , Page(s): 497
    Cited by:  Papers (1)
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    For original paper see Neto and Lee (IEEE Antennas Wireless Propag. Lett., vol.4, p.75-8, 2005). View full abstract»

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  • Correction to "Mutual Coupling Effects on the Performance of MIMO Wireless Channels"

    Publication Year: 2005 , Page(s): 496
    Cited by:  Papers (17)
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  • Correction to "The Lower Bounds on Q for Lossy Electric and Magnetic Dipole Antennas"

    Publication Year: 2005 , Page(s): 496
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  • BA-POC-based ranging method with multipath mitigation

    Publication Year: 2005 , Page(s): 492 - 495
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    Binary asymmetric-phase-only correlation (BA-POC) is investigated in this letter, and for the first time is applied into the area of ranging to help identify the line-of-sight (LOS) signal in multipath-abundant environments. Measurements made based on the 2.45-GHz wireless signal indicate that BA-POC has superior performance in mitigating multipath signals when compared with the conventional correlation method, and thus is able to increase the ranging accuracy. View full abstract»

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  • The influence of horizontally variable refractive index height profile on radio horizon range

    Publication Year: 2005 , Page(s): 489 - 491
    Cited by:  Papers (3)
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    This letter addresses refraction effects, assuming a horizontally nonhomogeneous troposphere. The influence of a range-dependent refractivity profile on a terrestrial radio link is investigated in terms of radio horizon range. The results can be used for interference analysis in metropolitan wireless networks. An analytical ray-tracing approach was employed to derive formulas for the radio horizon range calculation, considering a horizontally variable refractivity height profile. View full abstract»

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  • An optimized wideband quarter-wave patch antenna design

    Publication Year: 2005 , Page(s): 486 - 488
    Cited by:  Papers (6)
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    This letter introduces a quarter-wave patch antenna design using a newly developed jumping genes evolutionary paradigm. The impedance bandwidth is improved by the use of a trapeziform patch with a similar U-slot. Both simulated and measured results have confirmed that 80% impedance bandwidth is achievable using this design methodology. View full abstract»

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  • Numerical study of surface Integral formulations for low-contrast objects

    Publication Year: 2005 , Page(s): 482 - 485
    Cited by:  Papers (10)
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    Several surface integral formulations for electromagnetic interactions with homogeneous material bodies are studied numerically. Included are the well-known Muller and Poggio, Miller, Chang, Harrington, Wu, and Tsai (PMCHWT) formulations and two other formulations. One of the two formulations introduced gives a simple form of the Neumann series for low-contrast material bodies. The integral formulations are discretized into the matrix equations using the method of moments (MoM). The condition numbers of the matrices are evaluated using three definitions of norms and are shown as functions of combination constants. Numerical results also show the regions of the combination constants producing accurate results. View full abstract»

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  • Modulation scheme and channel dependence of ultra-wideband antenna performance

    Publication Year: 2005 , Page(s): 478 - 481
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    This letter applies a new statistical approach for the performance evaluation of ultra-wideband (UWB) communications antennas, to the comparison between time and frequency-based modulation schemes. The radio link output signal-to-noise ratio (SNR) is systematically referenced to that obtained by replacing the investigated antenna with an ideal one. This allows establishing a relative performance scale for antennas, suited to their context of use. In addition to the presentation of the method, this letter shows a few exemplary results demonstrating the antenna performance dependence on modulation and channel. View full abstract»

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  • Low-profile S-band dual-polarized antenna for SDARS application

    Publication Year: 2005 , Page(s): 475 - 477
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    This letter presents a low-form factor dual-polarized antenna incorporating a low-profile annular ring patch antenna having a 90° phase delay element for circular polarization (CP) and a reactive-loaded monopole linear polarized (LP) antenna. Both types of receiving antennas operate in the same frequency region, from 2.320 to 2.345 GHz, while different polarizations are used to take advantage of polarization diversity. The proposed CP antenna has good broadside radiation patterns, while the LP antenna reveals monopole-like radiation patterns. The gains of the antennas are measured to be 1.83 and 2.24 dBi for the CP and LP antenna, respectively. View full abstract»

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  • Application of the multilevel UV method to analyze large microstrip patch structures

    Publication Year: 2005 , Page(s): 471 - 474
    Cited by:  Papers (7)
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    The analysis of a plane wave incident on a large microstrip patch is studied using the method of moments (MoM) with the layered medium Green's functions and the rooftop basis functions. A fast numerical approach, the multilevel UV method, is employed to speed up the method of moment solution. A conjugate gradient method solver with preconditioning is applied as an iterative matrix solver to accelerate the matrix-vector multiplication. The multilevel UV method has O(N log N) complexity for CPU per iteration and memory. View full abstract»

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  • Field representations in general gyrotropic media in spherical coordinates

    Publication Year: 2005 , Page(s): 467 - 470
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB)  

    This letter presents a field expansion of the solution to three-dimensional electromagnetic problems in a material characterized by the general gyrotropic media. Both ε~ and μ~ tensors are gyrotropic, specified by six components and considered in the present analysis under spherical coordinates. Electromagnetic fields in general gyrotropic media are solved by using the method of separation of variables. Much effort is paid to the solution of a coupled set of second-order differential equations. Some specific situations of the parameters are investigated in detail. By properly grouping some terms, the electromagnetic fields are represented in a compact form. Compared to the existing results in the spherical coordinate system, the material properties investigated in this letter are more general. The general expressions of the fields are found to be reducible to those existing results for simpler cases. View full abstract»

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  • On obtaining wideband directional channel realizations from single-antenna channel sounding and simple ray tracing

    Publication Year: 2005 , Page(s): 463 - 466
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    In this letter, it is demonstrated that the dominant multipath radio waves predicted with simple ray tracing show a good match in the time domain with those obtained from complex impulse response measurements along outdoor trajectories. By combining the measured intensities and delays of these dominant multipath components with their angles-of-arrival and angles-of-departure obtained from the ray tracer, good wideband directional channel realizations can be derived. View full abstract»

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  • A miniature dielectric-loaded folded half-loop antenna and ground plane effects

    Publication Year: 2005 , Page(s): 459 - 462
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    A miniature dielectric-loaded folded half-loop antenna on a mobile terminal operating at 5.2 GHz to cover the IEEE802.11a wireless system is introduced. The length of the proposed antenna is reduced by 50% compared to the dielectric-loaded folded loop antenna in previous studies. The antenna's performance is not affected much by changing the size of the ground plane. The return loss and radiation patterns of the antenna are assessed using both a finite integration technique (FIT) simulation and experimental measurements. View full abstract»

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  • Microstrip patch antenna with defected ground structure for cross polarization suppression

    Publication Year: 2005 , Page(s): 455 - 458
    Cited by:  Papers (39)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    A defected ground structure (DGS) is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna. The proposed DGS pattern is simple and easy to etch on a commercial microstrip substrate. This will only reduce the XP radiation field without affecting the dominant mode input impedance and co-polarized radiation patterns of a conventional antenna. The new concept has been examined and verified experimentally for a particular DGS pattern employing a circular patch as the radiator. Both simulation and experimental results are presented. View full abstract»

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  • Broadband L-shaped dielectric resonator antenna

    Publication Year: 2005 , Page(s): 453 - 454
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (168 KB)  

    In this letter, a broadband inverted L-shaped dielectric resonator antenna (DRA) is proposed. The DRA with the two equiangular-triangle across sections is built on a ground plane and excited by a coaxial probe to provide broadside radiation patterns. The simulated and measured results verify that the proposed antenna offers a bandwidth of 38% (from 1.71 to 2.51 GHz) and stable broadside radiation patterns. The proposed antenna is suitable for multiband wireless communication applications as digital communication systems (DCS; 1710-1880 MHz), personal communication systems (PCS; 1850-1990 MHz), universal mobile telecommunication systems (UMTS; 1920-2170 MHz), and wireless local area networks (WLANs; 2.4-2.485 GHz). View full abstract»

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  • Efficient electromagnetic near-field computation by the multilevel fast multipole method employing mixed near-field/far-field translations

    Publication Year: 2005 , Page(s): 449 - 452
    Cited by:  Papers (12)
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    Method of moments (MoM) solutions of electromagnetic surface integral equations provide the desired amplitudes of the equivalent surface currents on the Huygens' surfaces around the involved objects, where the solution process is nowadays routinely accelerated by fast integral methods such as the multilevel fast multipole method (MLFMM). Computation of radiated or scattered electromagnetic fields produced by these currents requires integration over the Huygens' surfaces and can easily become extremely time-consuming for large numbers of observation points. In this contribution, integration of electromagnetic near-fields is accelerated by a postprocessing MLFMM approach, where near-field and far-field translations are combined in order to achieve optimum performance. The proposed approach has been applied in the postprocessing stage of a finite element boundary integral (FEBI) method with fast integral equation solution by MLFMM, saving a large amount of postprocessing computation time. The formulation of the proposed acceleration is presented and numerical results are shown. View full abstract»

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  • A novel site adaptive propagation model

    Publication Year: 2005 , Page(s): 447 - 448
    Cited by:  Papers (2)
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    A site adaptive knowledge guided neural network (KGNN) propagation model, using Hata model as knowledge base (KB) is presented. It adapts to measured data with rapid convergence. View full abstract»

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  • An ESPRIT-like algorithm for coherent DOA estimation

    Publication Year: 2005 , Page(s): 443 - 446
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    Conventionally, the approaches to coherent direction-of-arrival (DOA) estimation are to eliminate the rank loss of the spatial covariance matrix. In this letter, a new technique is presented from another point of view, which reconstructs a special antenna array model based on the Toeplitz matrix whose rank is only related to the DOA of signals and cannot be affected by the coherency between them. Therefore, the signal and noise subspaces can be estimated properly. In conjoint with the improved estimation of signal parameter via rotational invariance techniques (ESPRIT) algorithm, it is capable of resolving the DOAs of coherent signals as well as uncorrelated signals without peak searching. The numerical examples demonstrate its validity. View full abstract»

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  • Beamforming using support vector machines

    Publication Year: 2005 , Page(s): 439 - 442
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB)  

    Support vector machines (SVMs) have improved generalization performance over other classical optimization techniques. Here, we introduce an SVM-based approach for linear array processing and beamforming. The development of a modified cost function is presented and it is shown how it can be applied to the problem of linear beamforming. Finally, comparison examples are included to show the validity of the new minimization approach. 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