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# IEEE Transactions on Antennas and Propagation

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Displaying Results 1 - 25 of 44

Publication Year: 2008, Page(s):C1 - 621
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• ### IEEE Transactions on Antennas and Propagation publication information

Publication Year: 2008, Page(s): C2
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• ### A Comparison of Two and Three Dimensional Dipole Antennas for an Implantable Retinal Prosthesis

Publication Year: 2008, Page(s):622 - 629
Cited by:  Papers (32)
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The feasibility is investigated using three dimensional folded dipole antennas as a data-telemetry implantable receiving antenna in a dual-unit retinal prosthesis to restore partial vision to the blind. Three dimensional designs are explored in an effort to enhance certain antenna characteristics such as bandwidth and maximum gain while reducing the planar footprint size in comparison to its two d... View full abstract»

• ### A Novel Single-Feed Circular Microstrip Antenna With Reconfigurable Polarization Capability

Publication Year: 2008, Page(s):630 - 638
Cited by:  Papers (93)
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A single-feed circular microstrip antenna with reconfigurable polarization capability is proposed. This antenna has a simple structure, which consists of a radiating circular patch, five switches (PIN diode), three matching stubs, and a 50 microstrip feed line. It can be switched between 4 different states: two states (low-frequency and high-frequency) for linear polarization (LP), one state for l... View full abstract»

• ### Stub-Loaded Long-Wire Monopoles Optimized for High Gain Performance

Publication Year: 2008, Page(s):639 - 644
Cited by:  Papers (6)
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A technique to realize stub-loaded monopoles with enhanced gain performance is introduced in this paper. The omnidirectional high gain is achieved by combining an electrically long monopole with stubs attached at optimal locations along the antenna. In general, the lengths of the stub-loaded monopoles presented in this paper are significantly longer than conventional quarter-wave monopoles. Long w... View full abstract»

• ### Dual-Frequency Dual-Sense Circularly-Polarized Slot Antenna Fed by Microstrip Line

Publication Year: 2008, Page(s):645 - 649
Cited by:  Papers (41)  |  Patents (4)
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A new design of a dual-frequency dual circularly-polarized slot antenna is presented. The dual-frequency is achieved using a single-layer microstrip-fed configuration coupled to a modified annular-slot antenna. The dual sense circular-polarization is obtained by four unequal linear slots which augment the annular slot. Experimental results show the proposed antenna has good circular polarization c... View full abstract»

• ### Observing the Moon at Microwave Frequencies Using a Large-Diameter Deep Space Network Antenna

Publication Year: 2008, Page(s):650 - 660
Cited by:  Papers (11)
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The Moon radiates energy at infrared and microwave wavelengths, in addition to reflecting sunlight at optical wavelengths. As a result, an antenna pointed at or near the Moon will result in an increase in system operating noise temperature, which needs to be accounted for in RF telecommunications, radio science or radiometric link calculations. The NASA Deep Space Network (DSN) may use its large-d... View full abstract»

• ### Patch Fed Planar Dielectric Slab Extended Hemi-Elliptical Lens Antenna

Publication Year: 2008, Page(s):661 - 666
Cited by:  Papers (13)
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We present the results of a parametric study devised to allow us to optimally design a patch fed planar dielectric slab waveguide extended hemi-elliptical lens antenna. The lens antenna, 11lambda times 13lambda in the lens plane and 0.6lambda thick, constructed from polystyrene and weighing only 90 g is fabricated and characterized at 28.5 GHz for both single and multiple operating configurations.... View full abstract»

• ### Low Profile GALILEO Antenna Using EBG Technology

Publication Year: 2008, Page(s):667 - 674
Cited by:  Papers (46)
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A dedicated low profile antenna for geodesic applications is presented. This type of antenna requires mitigation of multipath signals to achieve sub-centimeter level of precision. Typically, bulky and heavy choke ring structures have been used to reduce the effects of multipath interference. The antenna presented here consists of a low temperature co-fired ceramic (LTCC) patch antenna immersed in ... View full abstract»

• ### A Compact Slot Antenna Utilizing a Right/Left-Handed Transmission Line Feed

Publication Year: 2008, Page(s):675 - 683
Cited by:  Papers (9)
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A novel compact planar antenna utilizing cascaded right/left-handed transmission lines is proposed. The significance of layout planning with respect to radiation is investigated and discussed in this paper. Two segments of transmission lines of the same electrical length with opposite signs are cascaded to provide zero phase at the operation frequency. The closed-form formulas for the equivalent c... View full abstract»

• ### Power and ${rm Q}$ of a Horizontal Dipole Over a Metamaterial Coated Conducting Surface

Publication Year: 2008, Page(s):684 - 690
Cited by:  Papers (3)
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The radiation properties of an electrically small antenna attached to an infinite conducting ground plane covered by a thin sheet of a metamaterial medium are considered. Using analytical field expressions, the radiation of an electric point dipole with arbitrary constitutive parameters of the material coating is studied. Attention is paid especially to permittivity values close to zero. Finite el... View full abstract»

• ### Metamaterial-Inspired Efficient Electrically Small Antennas

Publication Year: 2008, Page(s):691 - 707
Cited by:  Papers (183)  |  Patents (4)
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Planar two-dimensional (2D) and volumetric three-dimensional (3D) metamaterial-inspired efficient electrically-small antennas that are easy to design; are easy and inexpensive to build; and are easy to test; are reported, i.e., the EZ antenna systems. The proposed 2D and 3D electrical- and magnetic-based EZ antennas are shown to be naturally matched to a 50 source, i.e., without the introduction o... View full abstract»

• ### A CPS Leaky-Wave Antenna With Reduced Beam Squinting Using NRI-TL Metamaterials

Publication Year: 2008, Page(s):708 - 721
Cited by:  Papers (44)  |  Patents (1)
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A reduced beam-squinting printed leaky-wave antenna (LWA) is proposed, comprising cascaded negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. Each NRI-TL unit cell is implemented in co-planar strip (CPS) technology and consists of a host TL loaded with series interdigitated capacitors and shunt meandered inductors. Periodic analysis is applied to the NRI-TL unit cell in ... View full abstract»

• ### Investigation of a Boundary Integral Equation ${mbi n} times {mbi H} = {mbi J}_{s}$ on Torus-Shaped Perfect Conductors

Publication Year: 2008, Page(s):722 - 727
Cited by:  Papers (2)
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We have found that a boundary integral equation n times H = Js results in an inaccurate solution on torus-shaped perfect conducting surfaces. Although, constraining a boundary condition n times H = Js automatically satisfies E x n = 0 on a closed polyhedron-shaped conductor, there exists a solution which only satisfies the boundary condition n times H = Js but not ... View full abstract»

• ### New Physical Optics Approach for an Efficient Treatment of Multiple Bounces in Curved Bodies Defined by an Impedance Boundary Condition

Publication Year: 2008, Page(s):728 - 736
Cited by:  Papers (13)
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A new physical optics (PO) formulation is presented to treat radiation and scattering problems of curved bodies, including multiple reflections between the body parts. The approach uses electric and magnetic PO currents that are expanded as exponential terms. These terms are defined by spatially slow-varying amplitude and exponent functions. All the reflections of a multiple bounce contribution ar... View full abstract»

• ### Fully Probe-Corrected Near-Field Far-Field Transformation Employing Plane Wave Expansion and Diagonal Translation Operators

Publication Year: 2008, Page(s):737 - 746
Cited by:  Papers (43)
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Near-field antenna measurements combined with a near-field far-field transformation are an established antenna characterization technique. The approach avoids far-field measurements and offers a wide area of post-processing possibilities including radiation pattern determination and diagnostic methods. In this paper, a near-field far-field transformation algorithm employing plane wave expansion is... View full abstract»

• ### Dyadic Green's Functions for an Anisotropic, Non-Local Model of Biased Graphene

Publication Year: 2008, Page(s):747 - 757
Cited by:  Papers (224)
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Dyadic Green's functions are presented for an anisotropic surface conductivity model of biased graphene. The graphene surface can be biased using either a perpendicular static electric field, or by a static magnetic field via the Hall effect. The graphene is represented by an infinitesimally-thin, two-sided, non-local anisotropic conductivity surface, and the field is obtained in terms of Sommerfe... View full abstract»

• ### Assessment of FDTD Accuracy in the Compact Hemielliptic Dielectric Lens Antenna Analysis

Publication Year: 2008, Page(s):758 - 764
Cited by:  Papers (23)
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We assess the accuracy of a standard finite-difference time-domain (FDTD) code in the analysis of the near and far-field characteristics of two-dimensional (2-D) models of small-size dielectric lens antennas made of low or high-index materials and fed by the line sources. We consider extended hemielliptic lenses and use the Muller boundary integral equations (MBIE) method as a suitable reference s... View full abstract»

• ### A 3-D Enlarged Cell Technique (ECT) for the Conformal FDTD Method

Publication Year: 2008, Page(s):765 - 773
Cited by:  Papers (22)
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In this paper, we present an enlarged cell technique (ECT) to avoid the time step reduction encountered in the conformal finite-difference time-domain (CFDTD) method due to small irregular cells truncated by metallic boundaries. We focus our efforts on the discussion of the accuracy and stability of the ECT and its comparison with other conformal methods, especially the one called the uniformly st... View full abstract»

• ### Fully Coupled Hybrid FEM-UTD Method Using NURBS for the Analysis of Radiation Problems

Publication Year: 2008, Page(s):774 - 783
Cited by:  Papers (13)
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A novel hybrid finite element method (FEM) -uniform theory of diffraction (UTD) method for the analysis of radiating structures in the presence of electrically large objects is presented. The hybridization is done in a fully coupled way taking into account mutual interactions between the FEM and UTD regions. The UTD objects are modeled using non-uniform rational B-spline (NURBS) surfaces. Ray acce... View full abstract»

• ### Application of the Characteristic Basis Function Method Utilizing a Class of Basis and Testing Functions Defined on NURBS Patches

Publication Year: 2008, Page(s):784 - 791
Cited by:  Papers (43)
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A novel implementation of the characteristic basis function method (CBFM) is given, in which the high-level basis functions, called characteristic basis functions (CBFs), are represented in terms of curved rooftops generated from nonuniform rational B-splines (NURBS) in the parametric (u,v) domain. The associated macro-testing functions are defined by using curved razor-blade functions correspondi... View full abstract»

• ### A Warning About Metamaterials for Users of Frequency-Domain Numerical Simulators

Publication Year: 2008, Page(s):792 - 798
Cited by:  Papers (11)
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It is shown that users of frequency-domain numerical simulators should be warned of the danger of using models with adjacent complementary media since such a configuration of materials can be a cause of a numerical instability which cannot be overcome by the presence of other lossy media or absorbing boundary conditions. The physical realizability at any frequency of models considering complementa... View full abstract»

• ### Stabilization of Integral-Equation Formulations for the Accurate Solution of Scattering Problems Involving Low-Contrast Dielectric Objects

Publication Year: 2008, Page(s):799 - 805
Cited by:  Papers (10)
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The solution of scattering problems involving low-contrast dielectric objects with three-dimensional arbitrary shapes is considered. Using the traditional forms of the surface integral equations, scattered fields cannot be calculated accurately if the contrast of the object is low. Therefore, we consider the stabilization of the formulations by extracting the nonradiating parts of the equivalent c... View full abstract»

• ### Terminal-to-Terminal Hybrid Full-Wave Simulation of Low-Profile, Electrically-Small, Near-Ground Antennas

Publication Year: 2008, Page(s):806 - 814
Cited by:  Papers (19)
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An investigation into the simulation and performance of low-profile, electrically-small antennas for unattended ground sensor (UGS) networks is featured in this study. Because UGS transceivers are intended for operation near the ground, ground proximity effects become extremely important for considerations related to antenna efficiency, input matching, radiation pattern, and the overall path loss ... View full abstract»

• ### 1-Min Rain Rate Statistics Predictions From 1-Hour Rain Rate Statistics Measurements

Publication Year: 2008, Page(s):815 - 824
Cited by:  Papers (10)
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A new method is presented, which allows the recovery of the cumulative distribution function (CDF) of point rain rate with 1-min integration time (P(R)1) from rain rate CDFs with longer integration time (in this case, 1-hour time average rain rate statistics P(R)60)- The method generates the scaling factors between P(R)60) ... View full abstract»

## Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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## Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo