By Topic

# IEEE Antennas and Wireless Propagation Letters

## Filter Results

Displaying Results 1 - 25 of 155
• ### Accuracy Compensation in Direction Finding Using Patch Antenna Array With EBG Structure

Publication Year: 2006, Page(s):1 - 3
Cited by:  Papers (5)
| | PDF (164 KB) | HTML

This letter discusses a direction finding using a patch antenna array with an electromagnetic band-gap (EBG) structure. The super-resolution algorithm MUSIC is considered as an example of an adaptive nulling. Our numerical investigation shows the accuracy and depth of MUSIC spectrum is degraded due to the perturbation of surface wave, which is attributed to the insertion of EBG structure. Then, a ... View full abstract»

• ### A compact dual-band cavity-backed slot antenna

Publication Year: 2006, Page(s):4 - 6
Cited by:  Papers (34)
| | PDF (141 KB) | HTML

A compact design for dual- and wide-band cavity-backed slot antenna is presented in this letter. The slot antenna is fed by two microstrip lines on the top of the substrate for 900- and 1800-MHz bands, respectively. With the use of a U-type slot and a ridged slot backed by one rectangular cavity, a compact design is realized for a dual- and wide-band slot antenna. A prototype is fabricated and tes... View full abstract»

• ### Measured Results of a Dual-Band Dual-Mode Millimeter Wave Analog EMXT Waveguide Phase Shifter Electronically Scanned Antenna (ESA)

Publication Year: 2006, Page(s):7 - 10
Cited by:  Papers (2)
| | PDF (566 KB) | HTML

A proof-of-concept dual-band dual-mode 25/44-GHz electronically scanned array (ESA) is realized using electromagnetic crystal (EMXT) waveguide sidewalls developed at the Rockwell Scientific Company (RSC) and Rockwell Collins, Inc. (RCI). A 15-element one-dimensional (1-D) linear array was tested at the RCI near field antenna range to show frequency independence and beam steering capability. The re... View full abstract»

• ### A Novel Method for Estimating the Power Azimuth Spectrum of the Wireless Channel

Publication Year: 2006, Page(s):11 - 14
Cited by:  Papers (4)
| | PDF (181 KB) | HTML

A simple and novel method for estimating the power azimuth spectrum (PAS) is presented in this letter. Analysis shows that the expected power received by the directional antenna can be expressed as the integral of the PAS multiplied by the antenna pattern. Therefore, the PAS can be estimated by conducting azimuth-scanning power measurements with directional antenna and solving the integral equatio... View full abstract»

• ### Bandwidth Enhancement of Wide-Slot Antenna Fed by CPW and Microstrip Line

Publication Year: 2006, Page(s):15 - 17
Cited by:  Papers (66)
| | PDF (328 KB) | HTML

Two printed wide-slot antennas with square patches within an arc-shape slot are proposed in this letter. They are fed by a coplanar waveguide (CPW) and a microstrip line with almost the same performances. Their impedance bandwidths for $S_11leq -10~ dB$ are enhanced largely to more than 158%. The radiation patterns are given at 2, 6, and 10 GHz. View full abstract»

• ### A Folded Planar Inverted-F Antenna for GSM/DCS/Bluetooth Triple-Band Application

Publication Year: 2006, Page(s):18 - 21
Cited by:  Papers (23)
| | PDF (282 KB) | HTML

A new internal triple-band planar inverted-F antenna (PIFA) is presented. It is implemented by printing radiating conductors over both sides of an FR4 board. The geometrical parameters and electrical performances of the antenna can be obtained by cutting embedded slots on the patch surfaces and realizing electric via holes between two layers of the patch. This antenna covers GSM (880-960 MHz), DCS... View full abstract»

• ### The design of miniature three-element stochastic Yagi-Uda arrays using particle swarm optimization

Publication Year: 2006, Page(s):22 - 26
Cited by:  Papers (29)
| | PDF (312 KB) | HTML

A fixed grid structure of reduced length is employed to generate three-element miniature stochastic Yagi-Uda arrays. Particle swarm optimization (PSO) is utilized to alter the shape and the element distances for optimum forward gain, good front-to-back ratio, and 2:1 or better voltage standing wave ratio (VSWR). Simulation results of PSO are compared with binary valued genetic algorithm (GA) optim... View full abstract»

• ### Compact Designs of Waveguide Butler Matrices

Publication Year: 2006, Page(s):27 - 31
Cited by:  Papers (4)  |  Patents (1)
| | PDF (1219 KB) | HTML

Architectures of waveguide Butler matrices, for linear and planar arrays, utilizing both short-slot and top-wall hybrids, yield short path from input to output, minimize losses, save flanges, and reduces network size and weight. Novel three-dimensional (3-D) Butler matrix beamformer for volumetric multibeam from planar array is also presented. View full abstract»

• ### A Novel Reflective Surface for an UHF Spiral Antenna

Publication Year: 2006, Page(s):32 - 34
Cited by:  Papers (29)
| | PDF (621 KB) | HTML

As is well known, metallic cavity backings reduce antenna gain particularly for broadband configurations at low frequencies. This letter presents a novel reflective surface consisting of a ferrite tile with variable conductive coating as a backing for a conformal UHF spiral antenna. The ferrite material is used in the outer region to preserve the free-space antenna gain at low frequencies. Toward ... View full abstract»

• ### Pair-Matching Method for Estimating 2-D Angle of Arrival With a Cross-Correlation Matrix

Publication Year: 2006, Page(s):35 - 40
Cited by:  Papers (85)
| | PDF (238 KB) | HTML

This letter presents a novel method for pair matching of elevation and azimuth angles in two-dimensional (2-D) angles-of-arrival estimation employing two uniform linear arrays (ULAs). The proposed pair-matching method exploits the cross-correlation matrix of two received signals impinging on each ULA that shows the characteristics of the corresponding angle pairs, and is conducted by combining it ... View full abstract»

• ### A Method for Designing Fixed Multibeam Antenna Arrays in WCDMA Systems

Publication Year: 2006, Page(s):41 - 44
Cited by:  Papers (6)
| | PDF (222 KB) | HTML

In this letter, simulated annealing (SA) is used for designing a fixed multibeam antenna array (AA) in a multiuser radio wide-band code-division multiple-access (WCDMA) system. The method can be used dynamically in a real system and/or in a radio planning tool. The proposed method is applied on a linear array by designing the antenna element (AE) pattern, the number of fixed beams, the AE spacing,... View full abstract»

• ### High-accuracy neural-network-based array synthesis including element coupling

Publication Year: 2006, Page(s):45 - 48
Cited by:  Papers (6)
| | PDF (440 KB) | HTML

A novel neural-network (NN)-based technique for antenna array synthesis and a prototype of antenna array designed using it are presented. This technique is able to calculate the voltages that must be applied to the radiating elements considering all the physical properties of each element of the array and the coupling effects between all of them. View full abstract»

• ### Linear and Nonlinear Microwave Tomography Approaches for Subsurface Prospecting: Validation on Real Data

Publication Year: 2006, Page(s):49 - 53
Cited by:  Papers (13)
| | PDF (1001 KB) | HTML

In this letter, the capabilities of two tomographic approaches for subsurface prospecting have been tested against laboratory-controlled data. The first approach is a noniterative method based on the Born approximation, while the second one is a nonlinear iterative approach. Despite some simplifications adopted in modeling the scenario, both approaches have provided satisfying results. View full abstract»

• ### A Multivariate Autoregressive Model of Rain Attenuation on Multiple Short Radio Links

Publication Year: 2006, Page(s):54 - 57
Cited by:  Papers (8)
| | PDF (174 KB) | HTML

A multivariate autoregressive (AR) model for rain attenuation on a network of radio links is presented. Underlying assumptions are discussed, including the stationarity of rainfall rate in space and time within the region enclosing the links. Formulation of the model is described, together with some considerations for its application in assessing performance of a network of radio links. An example... View full abstract»

• ### An Indoor Pathloss Model at 60 GHz Based on Transport Theory

Publication Year: 2006, Page(s):58 - 60
Cited by:  Papers (16)
| | PDF (111 KB) | HTML

New analytical shadow loss model is presented that takes into account absorption and scattering of incident waves by obstacles. The input parameters for the model are the obstacle occupational density, obstacle number density, and mean geometric cross section of the obstacles. The model yields a closed-form expression for the mean excess loss in a typical office environment. Comparison with measur... View full abstract»

• ### An Inexact Newton Method for Microwave Reconstruction of Strong Scatterers

Publication Year: 2006, Page(s):61 - 64
Cited by:  Papers (41)
| | PDF (216 KB) | HTML

An approach to solve the inverse scattering problem for imaging applications is presented. The proposed algorithm is based on an inexact Newton method applied to the Lippmann-Schwinger integral equation. Inhomogeneous dielectric scatterers with high contrast in a tomographic arrangement are considered. The capabilities of the approach are assessed with reference to several different unknown object... View full abstract»

• ### A Pattern-Frequency-Dependent Wide-Band Slot Antenna

Publication Year: 2006, Page(s):65 - 68
Cited by:  Papers (9)
| | PDF (368 KB) | HTML

A new design for a coplanar waveguide (CPW)-fed wide-band slot antenna is presented in this letter. The basis for achieving such a broadband operation is to create a multiresonator in a slot cavity. By using a modified fork-like feeding structure, several different equivalent magnetic current paths are alternatively excited when the operated frequency is changed. Due to different radiation regions... View full abstract»

• ### An Unconditionally Stable Laguerre-Based S-MRTD Time-Domain Scheme

Publication Year: 2006, Page(s):69 - 72
Cited by:  Papers (8)
| | PDF (245 KB) | HTML

A time-domain method that combines the scaling function-based multiresolution time domain (S-MRTD) technique with a Laguerre polynomial-based time-integration scheme is formulated, applied, and evaluated in this letter. The motivation for this work stems from the fact that the disadvantages of each of these two techniques can be compensated for by the strength of the other. Namely, while S-MRTD su... View full abstract»

• ### On closely coupled dipoles in a random field

Publication Year: 2006, Page(s):73 - 75
Cited by:  Papers (32)  |  Patents (18)
| | PDF (132 KB) | HTML

Reception of partially correlated fields by two closely coupled electrical dipoles is discussed as a function of load impedances and open-circuit correlations. Two local maxima of the power may be achieved for two different load impedances, but in those cases the output correlations are high. Choosing the loads to give zero output correlations is possible for almost any real-valued open-circuit co... View full abstract»

• ### Analysis of Resonance Problems of Arbitrarily Complicated Transmission Line Cavities by Using Complex Phase Angle Theory

Publication Year: 2006, Page(s):76 - 79
| | PDF (141 KB) | HTML

A novel theory of complex phase angle is presented to deal with the resonance problems of an arbitrarily complicated transmission line cavity effectively, which merges various losses of transmission lines (including source and load losses) in the imaginary part of the complex phase angle. This letter shows that the real part of the complex phase angle $theta ^prime$ determines the resonant frequ... View full abstract»

• ### Fade Dynamics on Earth-Space Paths at Ku-Band in Fukuoka, Japan Fade-Slope Evaluation, Comparison, and Model

Publication Year: 2006, Page(s):80 - 83
Cited by:  Papers (6)
| | PDF (353 KB) | HTML

Using an efficient approach for data analysis, we discuss the evaluation of the fade slope as a function of sampling rate. From our analysis, we found that the standard deviation of the fade slope, as a function of attenuation, has a maximum and does not match the model recommended in ITU-R P.1623. Based on this observation, an improved fade-slope model is proposed. View full abstract»

• ### Bandwidth and gain improvement of a circularly polarized dual-rhombic loop antenna

Publication Year: 2006, Page(s):84 - 87
Cited by:  Papers (21)
| | PDF (474 KB) | HTML

We present a novel way to improve the performance of a circularly polarized (CP) dual-rhombic loop antenna. The bandwidth is enhanced by adding a pair of parasitic rhombic loops inside the dual-rhombic loop while the gain is increased with the help of a short backfire antenna (SBA). Good impedance matching is obtained by introducing a broadband balun. The addition of the parasitic elements leads t... View full abstract»

• ### Broadband DOA Estimation Using Optimal Array Pattern Synthesis Technique

Publication Year: 2006, Page(s):88 - 90
Cited by:  Papers (4)
| | PDF (180 KB) | HTML

An approach to direction-of-arrival (DOA) estimation for multiple broadband farfield signals is proposed. The approach uses a beamspace preprocessing structure based on frequency domain frequency-invariant beamforming. The frequency-invariant beamformers are designed using the optimal array pattern synthesis technique based on second-order cone programming (SOCP). The proposed method only ensure t... View full abstract»

• ### Extracting geometrical information of closely packed random media from multiply scattered light via a cross-correlation analysis

Publication Year: 2006, Page(s):91 - 94
Cited by:  Papers (1)
| | PDF (201 KB) | HTML

We have implemented a two-dimensional (2-D) pseudospectral time-domain (PSTD) numerical solution of Maxwell's equations to calculate the total scattering cross-section (TSCS) spectrum of a macroscopic, closely packed, random medium consisting of dielectric cylinders. Results reported in this letter show that a TSCS spectral signature is identified, revealing structural information of the random me... View full abstract»

• ### A Vertical Patch Antenna for Dual-Band Operation

Publication Year: 2006, Page(s):95 - 97
Cited by:  Papers (8)
| | PDF (171 KB) | HTML

A new dual-band vertical patch antenna for broadside radiation is described. The antenna is fed by a proximity-coupled probe, which maintains the advantages of the original single-band vertical patch antenna, such as small size, wide bandwidth and simple structure. The achieved bandwidths are 7% and 26%, respectively, at the lower and upper frequency bands. View full abstract»

## 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
Christophe Fumeaux
School of Electrical and Electronic Engineering