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# IEEE Transactions on Antennas and Propagation

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Displaying Results 1 - 25 of 66

Publication Year: 2012, Page(s):C1 - 1670
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• ### IEEE Transactions on Antennas and Propagation publication information

Publication Year: 2012, Page(s): C2
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• ### A Circuit Model for Electrically Small Antennas

Publication Year: 2012, Page(s):1671 - 1683
Cited by:  Papers (5)
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A circuit model for electrically small antennas is introduced that is based on their frequency-dependent polarizabilities. This model is useful for straightforwardly analyzing several different small antenna geometries. A negative permittivity sphere, shell, and spheroid are all analyzed. An inductively loaded dipole, a top-hat loaded dipole, and a spherical sheet impedance are also analyzed. The ... View full abstract»

• ### A Low-Profile Magneto-Electric Dipole Antenna

Publication Year: 2012, Page(s):1684 - 1689
Cited by:  Papers (39)
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A new low-profile magneto-electric dipole antenna composed of a horizontal planar dipole and a vertically oriented folded shorted patch antenna is presented. The antenna is simply excited by a coaxial feed without the need of an additional balun. A rectangular cavity-shaped reflector is introduced for enhancing the stability in radiation pattern over the operating frequencies. A parametric study i... View full abstract»

• ### A Robust UHF Near-Field RFID Reader Antenna

Publication Year: 2012, Page(s):1690 - 1697
Cited by:  Papers (27)  |  Patents (2)
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A novel broadband antenna for ultrahigh-frequency (UHF) near-field radio frequency identification (RFID) applications is presented. The antenna is composed of a grounded coplanar waveguide (GCPW), a coplanar stripline (CPS), a lumped balun, multiple resistors, and a finite-sized ground plane. The load impedance is equal to the characteristic impedance of the CPS, hence traveling wave can transmit ... View full abstract»

• ### Bandwidth-Enhanced Low-Profile Cavity-Backed Slot Antenna by Using Hybrid SIW Cavity Modes

Publication Year: 2012, Page(s):1698 - 1704
Cited by:  Papers (66)
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A bandwidth enhanced method of a low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna is presented in this paper. Bandwidth enhancement is achieved by simultaneously exciting two hybrid modes in the SIW-backed cavity and merging them within the required frequency range. These two hybrid modes, whose dominant fields are located in different half parts of the SIW cavity, are t... View full abstract»

• ### Bandwidth Enhancement of Small-Size Planar Tablet Computer Antenna Using a Parallel-Resonant Spiral Slit

Publication Year: 2012, Page(s):1705 - 1711
Cited by:  Papers (43)  |  Patents (1)
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An internal planar tablet computer antenna having a small size of 12 × 35 mm2 printed on a 0.8-mm thick FR4 substrate for the WWAN operation in the 824-960 and 1710-2170 MHz bands is presented. The antenna comprises a driven strip, a parasitic shorted strip and a ground pad, all printed on the small-size FR4 substrate. For bandwidth enhancement of the antenna's lower band, the an... View full abstract»

• ### Bandwidth Enhancement of a Microstrip Line-Fed Printed Wide-Slot Antenna With a Parasitic Center Patch

Publication Year: 2012, Page(s):1712 - 1716
Cited by:  Papers (54)
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A printed wide-slot antenna with a parasitic patch for bandwidth enhancement is proposed and experimentally investigated. A simple 50-Ω microstrip line is used to excite the slot. A rotated square slot resonator is considered as reference geometry. The rotated square slot antenna exhibits two resonances (f1 : lower resonant frequency, f2: higher resonant frequency). By... View full abstract»

• ### Analysis, Simulation and Measurements of CBS Antennas Loaded With Non-Uniformly Biased Ferrite Material

Publication Year: 2012, Page(s):1717 - 1726
Cited by:  Papers (7)
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When ferrite materials are used in the design of the CBS antennas, they are usually magnetized by the applied magnetic field produced by an electromagnet or permanent magnets. In modeling of such antennas, it is common practice to ignore the actual distribution of the applied field and assume it is uniform. We demonstrate that such an assumption leads to inaccurate results when the applied field i... View full abstract»

• ### Leaky-Wave Radiation Behavior From a Double Periodic Composite Right/Left-Handed Substrate Integrated Waveguide

Publication Year: 2012, Page(s):1727 - 1735
Cited by:  Papers (28)
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A double periodic composite right/left-handed ( DP-CRLH ) substrate integrated waveguide (SIW) is proposed based on the transmission line theory. A new leaky-wave radiation is observed at low frequency below the left-handed passband in addition to the composite right/left-handed property. First, the equivalent circuit of the proposed structure is analyzed, and dispersion characteristics are obtain... View full abstract»

• ### Design of Transverse Electromagnetic Horn for Concrete Penetrating Ultrawideband Radar

Publication Year: 2012, Page(s):1736 - 1743
Cited by:  Papers (9)
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We propose a design for the specific class of trans- verse electromagnetic (TEM) horn that can effectively radiate the electromagnetic signals into soil or concrete. The designed horn antenna has the same aperture height and width, resulting in a square-shaped horn aperture. A design guideline for the horn that considers return loss and radiation performance is described in this paper. The propose... View full abstract»

• ### A Millimeter-Wave Antenna Amplitude and Phase Measurement System

Publication Year: 2012, Page(s):1744 - 1757
Cited by:  Papers (5)
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We describe the design and application of a system for measuring the magnitude and phase of antenna radiation patterns in the 182-194 GHz frequency range. A heterodyne receiver comparing antenna and reference signals is designed from readily available components and incorporated into a 12-m anechoic chamber. The chamber is used with or without a compact-range reflector for compact-range or far-fie... View full abstract»

• ### Reverberation Chamber Techniques for Determining the Radiation and Total Efficiency of Antennas

Publication Year: 2012, Page(s):1758 - 1770
Cited by:  Papers (61)
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Reverberation chambers are becoming a popular alternative testing facility for a wide range of electromagnetic applications. Because of the statistical environment created inside a reverberation chamber, they offer a unique test facility. In particular, these chambers are ideally suited for performing radiated power measurements of either an antenna or device under test, and as such, it is possibl... View full abstract»

• ### Method of Synthesizing a Beam-Forming Device for the N-Beam and N-Element Array Antenna, for any N

Publication Year: 2012, Page(s):1771 - 1776
Cited by:  Papers (6)
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The possibility of forming a set of spatially dispersed and mutually orthogonal beams in an array antenna has been known long ago. The method for obtaining a device that forms a fan of beams for arrays with the number of elements and beams equal to N = 2p was suggested by Butler. Realizing a fan of mutually orthogonal beams for arrays with any N, was shown by us in "Synthesis of pattern... View full abstract»

• ### Characteristic Excitation Taper for Ultrawideband Tightly Coupled Antenna Arrays

Publication Year: 2012, Page(s):1777 - 1784
Cited by:  Papers (14)
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We propose a novel technique to calculate a quasi- optimal aperture excitation for finite size, ultrawideband arrays. The approach is based on using the characteristic modes of the array's mutual impedance matrix. Unlike standard excitation tapers, primarily used for beam shaping, the proposed characteristic mode taper provides for wideband matching of all array elements, including those at the ed... View full abstract»

• ### A Series Slot Array Antenna for 45 $^{circ}$-Inclined Linear Polarization With SIW Technology

Publication Year: 2012, Page(s):1785 - 1795
Cited by:  Papers (13)
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The design method for a standing-wave series slot array antenna with 45°-inclined linear polarization in the Ka-band is presented. The proposed 16 × 8 planar slot array antenna consisted of arrays with alternating reactance slot pairs that could achieve impedance matching and uniform field ex- citation, simultaneously. Furthermore, the grating lobes were effectively suppressed with t... View full abstract»

• ### Circular Beam-Steering Reconfigurable Antenna With Liquid Metal Parasitics

Publication Year: 2012, Page(s):1796 - 1802
Cited by:  Papers (47)  |  Patents (1)
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A novel antenna reconfiguration mechanism based on the displacement of liquid metal sections is presented. The liquid nature of the moving parts of the antenna helps avoid the main disadvantage of mechanically-actuated reconfigurable antennas which is the mechanical failure of their solid parts due to material fatigue, creep or wear. Furthermore, the displacement of liquid elements can be more eff... View full abstract»

• ### A Microstrip Patch Electronically Steerable Parasitic Array Radiator (ESPAR) Antenna With Reactance-Tuned Coupling and Maintained Resonance

Publication Year: 2012, Page(s):1803 - 1813
Cited by:  Papers (32)
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A new approach to parasitic phased-array antennas is presented. A symmetric two-layer, single-input inexpensive three-element array at 1-GHz employing varactors as tuning mechanisms are designed, fabricated, and measured. The driven element is mutually coupled to two parasitic elements in the H-plane. The varactors are used to control the mutual coupling and beam scanning and to maintain resonance... View full abstract»

• ### Floquet Modal Based Analysis of Overlapped and Interlaced Subarrays

Publication Year: 2012, Page(s):1814 - 1820
Cited by:  Papers (2)
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A methodology is presented to analyze overlapped and interlaced (interleaved) subarrays. The analysis is based on eigen vector excitation coupled with Floquet modal expansion of the subarray fields. Numerical results of interlaced and overlapped subarrays using probe-fed patch elements are presented. It is found that for wide angle scan overlapped subarrays have superior performances over interlac... View full abstract»

• ### Reconfigurable Reflectarrays Based on Optimized Spiraphase-Type Elements

Publication Year: 2012, Page(s):1821 - 1830
Cited by:  Papers (6)
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Reconfigurable spiraphase-type reflectarrays based on ring slot resonators with switchable radial stubs are presented. The mathematical model of the infinite array was used to optimize the spiraphase-type element at 36.5 GHz. The optimization goals were to minimize the dissipative loss in the p-i-n diode switches and to reduce the cross-polarization radiation. The mathematical model of the finite ... View full abstract»

• ### A Real-Valued Parallel Clonal Selection Algorithm and Its Application to the Design Optimization of Multi-Layered Frequency Selective Surfaces

Publication Year: 2012, Page(s):1831 - 1843
Cited by:  Papers (6)
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A parallelized real-valued clonal selection algorithm (CLONALG) is successfully implemented in this paper utilizing message passing interface (MPI) to reduce the computational burden of a large clone pool. CLONALG is one of the many branches of Artificial Immune System (AIS) algorithms with unique inherent properties that make it a very efficient optimization techniques for multimodal problems suc... View full abstract»

• ### The Linear Sampling Method as a Way to Quantitative Inverse Scattering

Publication Year: 2012, Page(s):1844 - 1853
Cited by:  Papers (39)
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The linear sampling method (LSM) is a simple and effective approach to image the shape of unknown targets via the solution of a linear inverse problem. In this paper, we show that the LSM can also be exploited to devise a novel effective approximation of the scattering phenomenon, that leads to a new noniterative linear inversion method for the estimation of the target's electric contrast. Since t... View full abstract»

• ### Electromagnetic Inverse Scattering Algorithm and Experiment Using Absolute Source Characterization

Publication Year: 2012, Page(s):1854 - 1867
Cited by:  Papers (7)
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We present the results of a free-space microwave inverse scattering algorithm and experiment. The inversion algorithm is based on the Born iterative method but with a new integral equation operator that directly links the material contrasts we wish to image to S-parameter measurements of a vector network analyzer. This is done with a full-wave antenna model based on the source-scattering matrix fo... View full abstract»

• ### The Reconstruction of Shape and Impedance Exploiting Space Mapping With Inverse Difference Method

Publication Year: 2012, Page(s):1868 - 1877
Cited by:  Papers (6)
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The reconstruction of shape and impedance obtained from measurements of scattered electromagnetic fields is considered for the two-dimensional case. Space mapping with inverse difference technique which is newly developed to solve inverse problem is used for this purpose. One of the advantages of this technique over other space mapping techniques is that it does not need parameter extraction durin... View full abstract»

• ### A Frequency-Domain Near-Field-to-Far-Field Transform for Planar Layered Media

Publication Year: 2012, Page(s):1878 - 1885
Cited by:  Papers (4)
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We report a frequency-domain near-field-to-far-field transform (NFFFT) for the numerical modeling of radiation and scattering in planar multilayered spaces. Although the results are equivalent to those of Demarest (1996), the formulation is more compact, more stable, and applicable to observation angles in the lower half space. Furthermore, the results are presented in a vector-potential formalism... 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