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# IEEE Transactions on Antennas and Propagation

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Publication Year: 2004, Page(s): c1
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• ### IEEE Transactions on Antennas and Propagation publication information

Publication Year: 2004, Page(s): c2
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• ### A review of antennas and propagation for MIMO wireless communications

Publication Year: 2004, Page(s):2810 - 2824
Cited by:  Papers (377)  |  Patents (3)
| | PDF (640 KB) | HTML

Multiple-input-multiple-output (MIMO) wireless systems use multiple antenna elements at transmit and receive to offer improved capacity over single antenna topologies in multipath channels. In such systems, the antenna properties as well as the multipath channel characteristics play a key role in determining communication performance. This paper reviews recent research findings concerning antennas... View full abstract»

• ### Harmonic radar transceiver design: miniature tags for insect tracking

Publication Year: 2004, Page(s):2825 - 2832
Cited by:  Papers (82)  |  Patents (5)
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The design and operation along with verifying measurements of a harmonic radar transceiver, or tag, developed for insect tracking are presented. A short length of wire formed the antenna while a beam lead Schottky diode across a resonant loop formed the frequency doubler circuit yielding a total tag mass of less than 3 mg. Simulators using the method-of-moments for the antenna, finite-integral tim... View full abstract»

• ### Study of ultrawide-band transmission in the extremely high frequency (EHF) band

Publication Year: 2004, Page(s):2833 - 2842
Cited by:  Papers (17)
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The growing demand for broad-band wireless communication links and the lack of wide frequency bands within the conventional spectrum, causes us to seek bandwidth in the higher microwave and millimeter-wave spectrum at extremely high frequencies (EHF) above 30 GHz. One of the principal challenges in realizing modern wireless communication links in the EHF band are phenomena occuring during electrom... View full abstract»

• ### Propagation of electromagnetic waves at MHz frequencies through seawater

Publication Year: 2004, Page(s):2843 - 2849
Cited by:  Papers (59)
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The nature of the ocean environment and its vast size has necessitated the development of sophisticated equipment and techniques for various underwater applications including diver-to-diver communications, ROV/AUV docking, communications and oil and gas explorations. To facilitate scientific exploration a wide variety of systems and vehicles have been developed to operate within the shallow contin... View full abstract»

• ### A novel horn radiator with high aperture efficiency and low cross-polarization and applications in arrays and multibeam reflector antennas

Publication Year: 2004, Page(s):2850 - 2859
Cited by:  Papers (25)  |  Patents (2)
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A step horn structure is presented that yields about 90% aperture efficiency with low cross-polar radiation. It is found that for obtaining high aperture efficiency, the horn aperture should consist of only the TEz type of modes in appropriate amplitudes and phases. The desired TEz modes are produced using multiple steps in the horn walls. The distances between the steps are ... View full abstract»

• ### A reconfigurable slot aperture design over a broad-band substrate/feed structure

Publication Year: 2004, Page(s):2860 - 2870
Cited by:  Papers (14)
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A novel dual-band reconfigurable aperture (RECAP) design is introduced for operation over a two-octave bandwidth. The proposed RECAP consists of interleaved crossed-slot elements for dual-polarized and broad-band array operation without grating lobes. The dimensions of the array elements can be reconfigured by using radio-frequency switches such as microelectromechanical systems or PIN diodes. The... View full abstract»

• ### A C/ka dual frequency dual Layer circularly polarized reflectarray antenna with microstrip ring elements

Publication Year: 2004, Page(s):2871 - 2876
Cited by:  Papers (62)  |  Patents (4)
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This paper reports a dual frequency dual layer circularly polarized reflectarray operating in the C and Ka bands. A 0.5-m right-hand circularly polarized planar reflectarray antenna is designed using microstrip ring elements of variable rotations to achieve a cophasal beam at broadside. The microstrip ring elements are more compact than the traditional reflectarray elements and can minimize blocka... View full abstract»

• ### Shorting strap tunable stacked patch PIFA

Publication Year: 2004, Page(s):2877 - 2884
Cited by:  Papers (47)  |  Patents (6)
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An oppositely shorted dual-band stacked patch planar inverted-F antenna (PIFA) is developed. RF switches are integrated to the shorting straps of the stacked patches to make a tunable PIFA. The L band switch yields 0.45-dB insertion loss and 10-dB isolation bandwidth (BW) of 108% at 1.8 GHz. The tunable PIFA yields 10% frequency tunability BW at 745 MHz when the number of upper radiating patch's s... View full abstract»

• ### Analysis of injection-locked antenna array including mutual coupling effects

Publication Year: 2004, Page(s):2885 - 2890
Cited by:  Papers (10)
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In this paper, the injection locking performance analysis of dipole antenna array with each element loaded with a two-terminal oscillator is presented. The analysis is based on the nonlinear model of oscillator and the linear model of antenna array considering mutual coupling effects. The locking range of injection signal and the array radiated power are obtained by solving an equivalent multiport... View full abstract»

• ### Null steering in phased arrays by controlling the positions of selected elements

Publication Year: 2004, Page(s):2891 - 2895
Cited by:  Papers (25)
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A new technique is presented that is capable of steering s in the antenna pattern in the directions of strong interference signals without affecting the main beam. The technique is based on the element position perturbations of selected elements of the antenna array. This technique frees the phase shifters to be used solely for steering the main beam toward the direction of the desired signal. It ... View full abstract»

• ### Efficient electromagnetic analysis of line-fed aperture antennas in thick conducting screens

Publication Year: 2004, Page(s):2896 - 2903
Cited by:  Papers (9)
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This paper presents a numerical and experimental verification of an approximate but efficient integral equation technique for the scattering by apertures in conducting planes with finite thicknesses. The approach is based on a perturbation method and modified Green's functions that take into account the finite metallization thickness. The computational effort and time needed for solving the proble... View full abstract»

• ### Circular aperture pattern synthesis from collapsed equivalent line-source distributions

Publication Year: 2004, Page(s):2904 - 2911
Cited by:  Papers (1)
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A novel circular aperture pattern synthesis technique is presented, which enables a linear line-source distribution to be converted to a rotationally symmetric circular aperture distribution, of which any φ-cut radiation pattern is ideally the same as the principal plane pattern of the line-source distribution. Line-source pattern synthesis techniques are numerous and versatile and the techniq... View full abstract»

• ### A hybrid approach for the optimal synthesis of pencil beams through array antennas

Publication Year: 2004, Page(s):2912 - 2918
Cited by:  Papers (55)  |  Patents (1)
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A hybrid approach to the synthesis of excitations and locations of nonuniformly spaced arrays in order to achieve optimal focusing in any given direction is proposed and discussed. The approach takes definite advantage from the convexity of the problem with respect to excitation variables, and exploits a Simulated Annealing procedure as far as location variables are concerned. The corresponding sy... View full abstract»

• ### Planar antenna array control with genetic algorithms and adaptive array theory

Publication Year: 2004, Page(s):2919 - 2924
Cited by:  Papers (20)
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Planar arrays are successfully employed in radar and communication systems in order to allow three-dimensional-scanning. In the framework of real-time control of antenna arrays, starting from the Applebaum theory, this paper presents an approach based on a customized genetic algorithm aimed at adaptively eliminating interfering signals. Successful applications are presented in order to evaluate th... View full abstract»

• ### Multiband single-layer frequency selective surface designed by combination of genetic algorithm and geometry-refinement technique

Publication Year: 2004, Page(s):2925 - 2931
Cited by:  Papers (72)
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This paper proposes an optimization-design method for the frequency selective surface (FSS) based on the genetic algorithm (GA) incorporated with a geometry-refinement technique. The present method takes the connectivity condition of the elements into consideration, thereby resulting in an easy fabrication. As an example, we design the multiband single-layer FSS for transmitting L band (1.5 GHz ba... View full abstract»

• ### Comparison of fitness landscapes for evolutionary design of dipole antennas

Publication Year: 2004, Page(s):2932 - 2940
Cited by:  Papers (1)
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Evolutionary algorithms are powerful optimization and design tools, and the design of fitness function is their crucial phase. The ruggedness of a fitness function landscape has a profound effect on optimization speed. The choice of objectives and penalty coefficients are important problems for evolutionary antenna design, because these parameters influence the ruggedness of the fitness function l... View full abstract»

• ### The treatment of thin wires in the FDTD method using a weighted residuals approach

Publication Year: 2004, Page(s):2941 - 2949
Cited by:  Papers (9)
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In this contribution, the problem of accurately representing thin wires within the finite-difference time-domain (FDTD) mesh is addressed by means of a method based on the weighted residual (WR) interpretation of the FDTD algorithm. Results for wire dipoles and wire transmission lines, obtained using the proposed method, are presented and compared to those obtained using existing techniques. It is... View full abstract»

• ### Z-transform theory and FDTD stability

Publication Year: 2004, Page(s):2950 - 2954
Cited by:  Papers (2)
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In this paper we analyze the stability and the accuracy of finite-difference time-domain (FDTD) algorithms using Z-transform technique. Conventional time-staggered approximation of the time-derivative is replaced by a rational transfer function discrete-time filter. Then a generalized formulation of the FDTD time-stepping is presented. Finally, we show that it is possible significantly reduce the ... View full abstract»

• ### Finite-difference and pseudospectral time-domain methods applied to backward-wave metamaterials

Publication Year: 2004, Page(s):2955 - 2962
Cited by:  Papers (32)
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Backward-wave (BW) materials that have simultaneously negative real parts of their electric permittivity and magnetic permeability can support waves where phase and power propagation occur in opposite directions. These materials were predicted to have many unusual electromagnetic properties, among them amplification of the near-field of a point source, which could lead to the perfect reconstructio... View full abstract»

• ### Approximate Crank-Nicolson schemes for the 2-D finite-difference time-domain method for TEz waves

Publication Year: 2004, Page(s):2963 - 2972
Cited by:  Papers (62)
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Two implicit finite-difference time-domain (FDTD) methods are presented in this paper for a two-dimensional TEz wave, which are based on the unconditionally-stable Crank-Nicolson scheme. To treat PEC boundaries efficiently, the methods deal with the electric field components rather than the magnetic field. The "approximate-decoupling method" solves two tridiagonal matrices and computes ... View full abstract»

• ### An accurate scheme for the solution of the time-domain Integral equations of electromagnetics using higher order vector bases and bandlimited extrapolation

Publication Year: 2004, Page(s):2973 - 2984
Cited by:  Papers (28)
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Despite the numerous advances made in increasing the computational efficiency of time-domain integral equation (TDIE)-based solvers, the stability and accuracy of TDIE solvers remain problematic. This paper introduces a new numerical method for the accurate solution of TDIEs for scattering from arbitrary perfectly conducting surfaces. The work described in this paper uses the higher order divergen... View full abstract»

• ### Higher order hierarchical Legendre basis functions for electromagnetic modeling

Publication Year: 2004, Page(s):2985 - 2995
Cited by:  Papers (134)
| | PDF (800 KB) | HTML

This paper presents a new hierarchical basis of arbitrary order for integral equations solved with the method of moments (MoM). The basis is derived from orthogonal Legendre polynomials which are modified to impose continuity of vector quantities between neighboring elements while maintaining most of their desirable features. Expressions are presented for wire, surface, and volume elements but emp... View full abstract»

• ### Study of mixed-order basis functions for the locally corrected Nyström method

Publication Year: 2004, Page(s):2996 - 3004
Cited by:  Papers (28)
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A high-order locally corrected Nyström (LCN) method employing the mixed-order basis functions proposed by C$80alιs$80kan and Peterson is presented for the electromagnetic scattering by targets composed of both dielectric and conducting bodies. An integral operator based on a combined field formulation for conducting surfaces and a Müller formulation for dielectric surfaces is used. ... 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