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# IEEE Transactions on Antennas and Propagation

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Displaying Results 1 - 25 of 52

Publication Year: 2008, Page(s):C1 - 1509
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• ### IEEE Transactions on Antennas and Propagation publication information

Publication Year: 2008, Page(s): C2
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• ### A Dual-Mode Millimeter-Wave Folded Microstrip Reflectarray Antenna

Publication Year: 2008, Page(s):1510 - 1517
Cited by:  Papers (12)
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A dual-mode folded microstrip reflectarray antenna was developed and demonstrated in this paper. The proposed folded reflectarray antenna contains three parts: a planar main reflector, a planar subreflector, and printed feed antennas. The main reflector is used to produce twisted reradiated fields and to provide phase compensation for focusing. The subreflector parallel with the main reflector is ... View full abstract»

• ### Multifed Printed Reflectarray With Three Simultaneous Shaped Beams for LMDS Central Station Antenna

Publication Year: 2008, Page(s):1518 - 1527
Cited by:  Papers (38)
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A two-layer reflectarray is proposed as a central station antenna for a local multipoint distribution system (LMDS) in the 24.5-26.5 GHz band. The antenna produces three independent beams in an alternate linear polarization that are shaped both in azimuth (sectored) and in elevation (squared cosecant). The design process is divided into several stages. First, the positions of the three feeds are e... View full abstract»

• ### Mechanically Tunable Multiband Compact Quadrifilar Helix Antenna With Dual Mode Operation

Publication Year: 2008, Page(s):1528 - 1532
Cited by:  Papers (10)
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We show that by introducing a gap at the center of the helical sections (where the current is minimum) of a lambda/2 quadrifilar helix antenna (QHA) and varying the axial length and radial gap between the overlapping volutes, the antenna gives a 28% impedance bandwidth which is nine times the bandwidth of a conventional QHA. A 16% bandwidth with a front to back ratio of ges 14 dB is achievable wit... View full abstract»

• ### Low Profile Miniaturized Planar Antenna With Omnidirectional Vertically Polarized Radiation

Publication Year: 2008, Page(s):1533 - 1540
Cited by:  Papers (20)
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A novel miniaturized cavity-backed composite slot loop antenna (CBCSLA) with low profile and omnidirectional radiation similar to a short dipole is presented. The antenna displays vertical polarization while having less than lambda/100 dimension in height. The geometry of the antenna is inspired from a small magnetic loop which is realized using a slot configuration on metallic ground. Since a sma... View full abstract»

• ### Two-Layer Dielectric Rod Antenna

Publication Year: 2008, Page(s):1541 - 1547
Cited by:  Papers (18)  |  Patents (1)
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A dielectric rod antenna (DRA) design that consists of two concentric dielectric cylinders and achieves more than 4:1 bandwidth is described. The new DRA is composed of a launcher section, followed by a waveguide section and ends in a radiation section. The utilization of two-layer structure avoids the excitation of high-order modes, thus extending the operational bandwidth. Properly chosen radii ... View full abstract»

• ### Bloch Wave Analysis of Long Leaky Coaxial Cables

Publication Year: 2008, Page(s):1548 - 1554
Cited by:  Papers (12)
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Leaky coaxial cables can be used as distributed radiators for indoor communications. When the number of slots is large, as it is often the case, the application of a full-wave analysis method is very demanding in terms of both memory and CPU time. In this paper an analysis technique, based on Bloch wave theory is presented. Slots are viewed as discontinuities in an open waveguide and a suitable ba... View full abstract»

• ### Reconfigurability and Beam Scanning With Phase-Only Control for Antenna Arrays

Publication Year: 2008, Page(s):1555 - 1565
Cited by:  Papers (27)
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A new method is presented on constrained power synthesis for reconfigurable arrays of arbitrary geometry. Given a number of suitable masks, the algorithm yields excitation vectors whose array patterns belong to such masks, and for each array element the excitation amplitude holds constant during the pattern reconfiguration, so as to ensure phase-only control. Each excitation amplitude is optimized... View full abstract»

• ### A Double Rhombus Antenna Fed by 180$^{circ}$ Phase Shifter for Ultrawideband Phased Array Applications

Publication Year: 2008, Page(s):1566 - 1572
Cited by:  Papers (3)
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A double rhombus antenna fed through a microstrip 180deg phase shifter is presented. The 180deg phase shifter is a novel design of microstrip-to-coplanar waveguide (CPW)-to-microstrip transition. The proposed phase shifter is obtained without changing the layer of the second microstrip line for an easy embedding into the feedline. Via holes are used to transfer the current from the top to the bott... View full abstract»

• ### Linear Retro-Directive Antenna Array Using 90$^{circ}$ Hybrids

Publication Year: 2008, Page(s):1573 - 1580
Cited by:  Papers (10)  |  Patents (1)
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A novel approach is developed to design linear passive retro-directive antenna arrays by properly making use of 90deg hybrids. For a 90deg hybrid, when its direct port and coupled port are terminated with the same reflection coefficient, the phase difference of the reflected signals at the other two ports are reversed to that of the incident signals. This then becomes to be a phase difference reve... View full abstract»

• ### Grating Lobe Reduction in a Phased Array of Limited Scanning

Publication Year: 2008, Page(s):1581 - 1586
Cited by:  Papers (23)  |  Patents (1)
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Amplitude and phase weighting at the subarray outputs alone causes grating lobes (GLs) in the array factor. A combined approach to disrupt the periodicity in the array is proposed to reduce the GLs. In this approach, three measures are simultaneously used. They are: (1) the optimized amplitude weighting at the subarray ports; (2) using the random subarray; and (3) the random staggering of the rows... View full abstract»

• ### Port Decoupling for Small Arrays by Means of an Eigenmode Feed Network

Publication Year: 2008, Page(s):1587 - 1593
Cited by:  Papers (61)  |  Patents (2)
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An alternative approach to port decoupling and matching of arrays with tightly coupled elements is proposed. The method is based on the inherent decoupling effect obtained by feeding the orthogonal eigenmodes of the array. For this purpose, a modal feed network is connected to the array. The decoupled external ports of the feed network may then be matched independently by using conventional matchi... View full abstract»

• ### Optically Beamformed Wideband Array Performance

Publication Year: 2008, Page(s):1594 - 1604
Cited by:  Papers (20)
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Optical beamforming networks (OBFNs) are an interesting alternative for the design of wideband antenna arrays, mainly due to their low losses and weight, their high parallel processing capabilities and their electromagnetic immunity. Nevertheless, for a practical implementation, different technological and architectural tradeoffs need to be assessed. In this paper, the performance of an OBFN syste... View full abstract»

• ### Singular Value Decomposition of the Radiation Operator—Application to Model-Order and Far-Field Reduction

Publication Year: 2008, Page(s):1605 - 1615
Cited by:  Papers (7)
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The time-harmonic electromagnetic scattering or radiation problem is considered. The singular value decomposition (SVD) is applied to the radiation operator that maps the set of electric and magnetic currents defined on the surface of an inhomogeneous object onto the set of the far-fields scattered (or radiated) from this object. The SVD yields orthonormal bases for both sets. Because the radiatio... View full abstract»

• ### Analytical-Numerical Calculation of Diffraction Coefficients for a Circular Impedance Cone

Publication Year: 2008, Page(s):1616 - 1623
Cited by:  Papers (12)
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An analytical-numerical computation of diffraction coefficients is described for a semi-infinite impedance cone of circular cross section illuminated by an electromagnetic plane wave. To enable an incomplete separation of variables, both the incident and scattered fields are expressed in terms of the Kontorovich-Lebedev (KL) integrals; an inversion of the Leontovich condition on the cone's surface... View full abstract»

• ### Simple and Accurate Analytical Model of Planar Grids and High-Impedance Surfaces Comprising Metal Strips or Patches

Publication Year: 2008, Page(s):1624 - 1632
Cited by:  Papers (245)  |  Patents (6)
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Simple analytical formulas are introduced for the grid impedance of electrically dense arrays of square patches and for the surface impedance of high-impedance surfaces based on the dense arrays of metal strips or square patches over ground planes. Emphasis is on the oblique-incidence excitation. The approach is based on the known analytical models for strip grids combined with the approximate Bab... View full abstract»

• ### Double $phi$-Step $theta$-Scanning Technique for Spherical Near-Field Antenna Measurements

Publication Year: 2008, Page(s):1633 - 1639
Cited by:  Papers (7)
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Probe-corrected spherical near-field antenna measurements with an arbitrary probe set certain requirements on an applicable scanning technique. The computational complexity of the general high-order probe correction technique for an arbitrary probe, that is based on the Phi scanning, is O(N4), where N is proportional to the radius of the antenna under test (AUT) minimum sphere in wavele... View full abstract»

• ### Design of Miniaturized Metamaterial Patch Antennas With $mu$-Negative Loading

Publication Year: 2008, Page(s):1640 - 1647
Cited by:  Papers (106)  |  Patents (1)
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Recent theoretical studies have shown that circular patch antennas loaded by an inhomogeneous substrate partially filled with a mu-negative (MNG) metamaterial may in principle support a resonant radiating mode, even if the total size of the radiator is significantly smaller than the wavelength of operation. In those theoretical analyses, MNG metamaterials have been assumed as continuous, isotropic... View full abstract»

• ### Mutual Coupling Reduction in Patch Antenna Arrays by Using a Planar EBG Structure and a Multilayer Dielectric Substrate

Publication Year: 2008, Page(s):1648 - 1655
Cited by:  Papers (98)
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Periodic structures can help in the reduction of mutual coupling by using their capability of suppressing surface waves propagation in a given frequency range. The purpose of this work is to show the viability of using a planar electromagnetic band gap (EBG) structure based on a truncated frequency selective surface (FSS) grounded slab to this aim. The goal is to use it in patch antenna arrays, ke... View full abstract»

• ### A Novel Compact Spiral Electromagnetic Band-Gap (EBG) Structure

Publication Year: 2008, Page(s):1656 - 1660
Cited by:  Papers (32)
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A novel compact electromagnetic band-gap (EBG) structure in a spiral shape is presented and investigated. This structure significantly enlarges the capacitance between neighboring elements. The simulations and experimental results have proved that the size of the spiral structure is only 30.9% of the conventional EBG structure. Two applications have been shown, including patch antenna with the spi... View full abstract»

• ### A W-Band Low-Loss Dual-Polarization Quasi-TEM Waveguide

Publication Year: 2008, Page(s):1661 - 1668
Cited by:  Papers (1)
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As an enabling feed/interconnect element for various millimeter wave components, dual polarization quasi-transverse electromagnetic (TEM) waveguides at W-band (75-110 GHz) are investigated with two-dimensional electromagnetic crystal (EMXT) surfaces as the four boundary walls instead of the regular metallic walls. A 2.54 mm x 2.54 mm quasi-TEM square waveguide prototype with a length of 2 mm is fa... View full abstract»

• ### Efficient Analysis of Phased Arrays of Microstrip Patches Using a Hybrid Generalized Forward Backward Method/Green's Function Technique With a DFT Based Acceleration Algorithm

Publication Year: 2008, Page(s):1669 - 1678
Cited by:  Papers (5)
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A hybrid method based on the combination of generalized forward backward method (GFBM) and Green's function for the grounded dielectric slab together with the acceleration of the combination via a discrete Fourier transform (DFT) based algorithm is developed for the efficient and accurate analysis of electromagnetic radiation/scattering from electrically large, irregularly contoured two-dimensiona... View full abstract»

• ### Hybrid FEM/Floquet Modes/PO Technique for Multi-Incidence RCS Prediction of Array Antennas

Publication Year: 2008, Page(s):1679 - 1686
Cited by:  Papers (4)
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An original method is proposed which associates rigorous 3D finite element methods (FEM) with Floquet modes through FACTOPO multidomain formalism for computing the radar cross section (RCS) of large array antennas. The most original aspect of the method is the fact that the source unit cell is characterized by a generalized scattering matrix (GSM) which does not depend on the plane wave incidence ... View full abstract»

• ### A Mesh-Adapted Closed-Form Regular Kernel for 3D Singular Integral Equations

Publication Year: 2008, Page(s):1687 - 1698
Cited by:  Papers (14)
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The Green's functions employed in the method of moments (MoM) diverge when observation and source points coincide; this is at the origin of the difficulties in computing the MoM matrix entries, and in handling the near-field interactions in fast Fourier transform (FFT)-based fast methods and other sampling-based methods. In this paper, we show that this singularity can be avoided, and a modified r... 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