# IEEE Transactions on Antennas and Propagation

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Displaying Results 1 - 25 of 65

Publication Year: 2012, Page(s):C1 - 3550
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• ### IEEE Transactions on Antennas and Propagation publication information

Publication Year: 2012, Page(s): C2
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• ### Minimum $Q$ Electrically Small Antennas

Publication Year: 2012, Page(s):3551 - 3558
Cited by:  Papers (11)
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Theoretically, the minimum radiation quality factor Q of an isolated resonance can be achieved in a spherical electrically small antenna by combining TM1m and TE1m spherical modes, provided that the stored energy in the antenna spherical volume is totally suppressed. Using closed-form expressions for the stored energies obtained through the vector spherical wave theory... View full abstract»

• ### Miniaturization of Microstrip Antennas by the Novel Application of the Giuseppe Peano Fractal Geometries

Publication Year: 2012, Page(s):3559 - 3567
Cited by:  Papers (51)
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We investigate the possibilities and properties of the application of Giuseppe Peano fractal geometry for the miniaturization of microstrip patch antennas and compare its performance with those of the usual fractals, such as Koch, Tee-Type and Sierpinski. The length of the Giuseppe Peano fractal patch perimeter increases, while its surface area remains constant without any more space occupation. C... View full abstract»

• ### Miniature Scalp-Implantable Antennas for Telemetry in the MICS and ISM Bands: Design, Safety Considerations and Link Budget Analysis

Publication Year: 2012, Page(s):3568 - 3575
Cited by:  Papers (95)
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We study the design and radiation performance of novel miniature antennas for integration in head-implanted medical devices operating in the MICS (402.0-405.0 MHz) and ISM (433.1-434.8, 868.0-868.6 and 902.8-928.0 MHz) bands. A parametric model of a skin-implantable antenna is proposed, and a prototype is fabricated and tested. To speed-up antenna design, a two-step methodology is suggested. This ... View full abstract»

• ### Multiple Frequency Band and High Isolation Mobile Device Antennas Using a Capacitive Slot

Publication Year: 2012, Page(s):3576 - 3582
Cited by:  Papers (9)  |  Patents (1)
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The performance characteristics of the capacitive slot, or a slot placed between the feed and ground connections, in a planar inverted-F antenna (PIFA) are comprehensively analyzed. The PIFA capacitive slot behavior is measured inside a two antenna system within a mobile phone where the first antenna is a multiple band PIFA and the second antenna is a higher frequency band PIFA directly overlappin... View full abstract»

• ### Switched Beam Antenna Employing Metamaterial-Inspired Radiators

Publication Year: 2012, Page(s):3583 - 3593
Cited by:  Papers (14)
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We present a novel switched beam antenna (SBA) consisting of four identical metamaterial-inspired electrically short printed monopoles, vertically placed at the corners of a grounded square board. The antenna is designed to operate in the frequency range 1600-2700 MHz, with global dimensions 120 mm × 120 mm × 30 mm. The SBA has been first numerically simulated and optimized and, then... View full abstract»

• ### Design Synthesis of Metasurfaces for Broadband Hybrid-Mode Horn Antennas With Enhanced Radiation Pattern and Polarization Characteristics

Publication Year: 2012, Page(s):3594 - 3604
Cited by:  Papers (17)  |  Patents (1)
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Metamaterial surfaces (metasurfaces) with a low effective index of refraction have been recently proposed for application in the design of hybrid-mode horn antennas, such as soft and hard horns. Here we explore designs of several metasurfaces and their use as liners for coating the interior walls of horn antennas. The design process combines the genetic algorithm optimization technique with a full... View full abstract»

• ### Generation of Propagating Bessel Beams Using Leaky-Wave Modes

Publication Year: 2012, Page(s):3605 - 3613
Cited by:  Papers (47)
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The generation of Bessel beams using a leaky radial waveguide is presented. The radial waveguide consists of a capacitive sheet over a ground plane. It supports an azimuthally invariant leaky-wave mode whose normal electric-field component is a truncated, zeroth-order Bessel function. The annular spectrum and nondiffractive extent of the Bessel beam is clearly linked to the complex wavenumber of t... View full abstract»

• ### Efficient Prediction of Array Element Patterns Using Physics-Based Expansions and a Single Far-Field Measurement

Publication Year: 2012, Page(s):3614 - 3621
Cited by:  Papers (13)
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A method is proposed to predict the antenna array beam through employing a relatively small set of physics-based basis functions-called characteristic basis function patterns (CBFPs)-for modeling the embedded element patterns. The primary CBFP can be measured or extracted from numerical simulations, while additional (secondary) CBFPs are derived from the primary one. Furthermore, each numerically ... View full abstract»

• ### An Effective Approach to the Synthesis of Phase-Only Reconfigurable Linear Arrays

Publication Year: 2012, Page(s):3622 - 3631
Cited by:  Papers (32)
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We present an effective approach to the optimal mask-constrained power pattern synthesis of uniformly spaced array antennas able to dynamically reconfigure their radiation pattern by modifying only the excitation phases. The proposed approach results in a design procedure having a very low computational burden and, by exploiting at best the knowledge available in the separate synthesis of each pat... View full abstract»

• ### SIW-Based Array Antennas With Sequential Feeding for X-Band Satellite Communication

Publication Year: 2012, Page(s):3632 - 3639
Cited by:  Papers (20)
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Novel phased array antennas suitable for X-band satellite communication are introduced and investigated for right-handed circular polarization (RHCP) in a multi-layered fabrication. The primary function of the proposed antennas is to transmit high quality data obtained from satellites and the ground station systems with the lowest amount of loss. For accurate data transmission, the important param... View full abstract»

• ### A 45$^circ$ Linearly Polarized Hollow-Waveguide Corporate-Feed Slot Array Antenna in the 60-GHz Band

Publication Year: 2012, Page(s):3640 - 3646
Cited by:  Papers (23)  |  Patents (1)
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A 45° linearly polarized hollow-waveguide slot array antenna has been proposed to achieve low sidelobes in the E- and H-planes by a diamond-shaped array arrangement. A layer for radiating slots was added into the conventional plate-laminated antenna. The 2 × 2-element sub-array was designed to suppress grating lobes and low cross-polarization. The 16 ×... View full abstract»

• ### Micro-Fabricated 130–180 GHz Frequency Scanning Waveguide Arrays

Publication Year: 2012, Page(s):3647 - 3653
Cited by:  Papers (30)  |  Patents (6)
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This paper describes frequency scanning slot arrays operating from 130 to 180 GHz. The arrays are micro-fabricated using the PolyStrata sequential copper deposition process. Measured reflection coefficient and radiation patterns agree with HFSS full-wave simulations. The voltage standing wave ratio is less than 1.75:1 over the entire frequency range, and the measured scanning is 1.04°<... View full abstract»

• ### Analysis and Design of Slitted Waveguides With Suppressed Slot-Mode Using Periodic FDTD

Publication Year: 2012, Page(s):3654 - 3660
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The characteristics of the slot- and perturbed TE10 modes in a slitted waveguide are studied for the purpose of suppressing the undesired slot-mode. The use of the finite difference time domain (FDTD) with periodic boundary conditions allows the extraction of the individual complex wavenumbers of the two modes, and thus the tracking of the modes as modifications are made to the structur... View full abstract»

• ### A Broadband Three-Dimensionally Isotropic Negative-Refractive-Index Medium

Publication Year: 2012, Page(s):3661 - 3669
Cited by:  Papers (15)
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When designing negative-refractive-index (NRI) metamaterials, scientists have struggled to overcome three primary obstacles: polarization dependence, narrow bandwidth, and fabrication challenges. Here, we address these issues with the design of a three-dimensional, fully isotropic, broadband NRI medium that can be produced on a large scale. The simulated structure exhibits a NRI bandwidth of 24.1%... View full abstract»

• ### Cut-Wire Metamaterial Design Based on Simplified Equivalent Circuit Models

Publication Year: 2012, Page(s):3670 - 3678
Cited by:  Papers (11)
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Effective equivalent circuits are used for the prediction of resonant and absorbing behavior of cut-wire-based (CW-based) metamaterials. Firstly, an equivalent circuit applicable to electric resonance frequencies of single CW metamaterial arrays is considered. Secondly, the equivalent circuit is extended for prediction of magnetic resonance frequencies of symmetrically paired CW metamaterial array... View full abstract»

• ### A Study on the Effective Permittivity of Carbon/PI Honeycomb Composites for Radar Absorbing Design

Publication Year: 2012, Page(s):3679 - 3683
Cited by:  Papers (11)
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Radar absorbing honeycomb composites with different coating thicknesses are prepared by impregnation of aramid paper frame with solutions containing conductive carbon blacks (non-magnetic) and PI (polyimide). Expressions for the effective permittivity of the composites are studied and validated both in theory and experiment. It is found that a theoretical equivalent panel with given permittivity c... View full abstract»

• ### Technique to Decompose Near-Field Reflection Data Generated From an Object Consisting of Thin Dielectric Layers

Publication Year: 2012, Page(s):3684 - 3692
Cited by:  Papers (9)
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Extracting properties of hidden structures using ultra-wideband (UWB) radar is evolving into a promising technology. For these applications, a short-duration electromagnetic wave is transmitted into an object or structure of interest and the backscattered fields that arise due to dielectric contrasts at interfaces are measured. The time-of-arrival (TOA) between reflections and the amplitude of the... View full abstract»

• ### Introduction of Oblique Incidence Plane Wave to Stratified Lossy Dispersive Media for FDTD Analysis

Publication Year: 2012, Page(s):3693 - 3705
Cited by:  Papers (3)
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In the application of finite-difference time-domain (FDTD) method to the wideband plane wave scattering analysis of objects embedded in stratified lossy dispersive media, it is a challenge to solve the obliquely incident wave. In this work, a novel configuration of auxiliary one-dimensional (1-D) FDTD grids is proposed to provide the obliquely incident plane wave at the total-field scattered-field... View full abstract»

• ### Shifted Pixel Method for Through-Wall Radar Imaging

Publication Year: 2012, Page(s):3706 - 3716
Cited by:  Papers (7)
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The current approach for accurate localization of targets behind walls using radar involves coupling of wall properties estimation and target location estimation. This involves the solution of a transcendental equation using approximations over several iterations. A new approach for through-wall target localization proposed in this paper which decouples the through-wall localization problem into t... View full abstract»

• ### Wavelet-Based Adaptive Multiresolution Inversion for Quantitative Microwave Imaging of Breast Tissues

Publication Year: 2012, Page(s):3717 - 3726
Cited by:  Papers (25)
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Microwave imaging is a feasible tool for medical imaging owing to the different electric properties of tissues. To this end, it is important to devise inversion procedures capable of achieving a reliable quantitative estimate of the tissues under test. With respect to breast screening, we propose a full-wave inversion method, which takes advantage of the adaptive multiresolution features of the wa... View full abstract»

• ### Enhanced Detection of On-Metal Retro-Reflective Tags in Cluttered Environments Using a Polarimetric Technique

Publication Year: 2012, Page(s):3727 - 3735
Cited by:  Papers (5)
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The detection and tracking of targets in highly cluttered environments poses a challenge due to the strong clutter backscatter present in the scene. A design concept based on a planar retro-reflective array to aide in the standoff detection and tracking of large metallic objects in a warehouse setting is presented. While traditional methods to achieve enhanced detection involve an increase in gain... View full abstract»

• ### An Efficient Framework for Using Higher-Order Curved Div-Conforming Elements With Cancellation of Weak Singularities in Local Space for Surface Integral Equation

Publication Year: 2012, Page(s):3736 - 3743
Cited by:  Papers (4)
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A reliable scheme for using higher-order curved div-conforming elements is presented. This procedure takes advantage of tangential basis functions developed for finite-element applications. Throughout the theorem of trace, the Helmholtz decomposition into solenoidal and nonsolenoidal subspaces is converted into a Hodge decomposition for the surface currents. Furthermore, a cancellation of the sing... View full abstract»

• ### E-MFIE Formulation for Arbitrary PEC Sheets

Publication Year: 2012, Page(s):3744 - 3753
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The scattering of an electromagnetic wave by a perfectly conducting sheet of arbitrary shape can be solved with the Method of Moments (MoM), but the solution obtained with the electric field integral equation (EFIE) yields the sum of the electric current densities on every opposite faces of the sheet, while the magnetic field integral equation (MFIE) cannot be used. In this paper, we first explain... 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