Journal of Electromagnetic Waves and Applications (J ELECTROMAGNET WAVE )

Publisher: Brill Academic Publishers

Description

This journal covers all aspects of electromagnetic wave theory and its various applications. The journal publishes original papers and review articles on new theories, methodology and computational techniques, and interpretations of both theoretical and experimental results. The aim is to report advancement and progress in the modern development of electromagnetic wave theory and to report new and exciting applications. The journal's scope is broad and includes the following topics: Wave propagation theory, Remote sensing, Inverse scattering, Geophysical subsurface probing, inversion techniques, Propagation in random media, Oceanography-radar reflection, Meteorology, Ionospheric effects on wave propagation, Ionospheric modifications and heating, Atmospherics, Antenna theory and applications, Transients, Radar measurements and applications, Active experiments using space vehicles, Extra-terrestrial remote sensing, Electromagnetic interferometry, Ground-based remote sensing, Agricultural remote sensing, Microelectronic, integrated circuits, EM wave transmission in VLSI, Electromagnetic pulse transmission and coupling, Electromagnetic compatibility, Optical and millimeter wave techniques, Integrated optics, Fiber optics, Communication systems, Solid state devices and circuits, Medical applications, biological effects, Ferrite devices, Field and network theory, High power devices and systems, Submicron structures, Waves in composite and amorphous materials, Expert systems in remote sensing, Numerical methods.

  • Impact factor
    1.40
    Show impact factor history
     
    Impact factor
  • 5-year impact
    1.59
  • Cited half-life
    2.50
  • Immediacy index
    0.34
  • Eigenfactor
    0.01
  • Article influence
    0.38
  • Website
    Journal of Electromagnetic Waves and Applications website
  • Other titles
    Journal of electromagnetic waves and applications (Online)
  • ISSN
    0920-5071
  • OCLC
    51038926
  • Material type
    Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Brill Academic Publishers

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Pre-print can only be deposited after acceptance for peer-review
    • Author may post on authors own website only
    • Publisher version may be posted on authors own website
    • Institution may post on institutional website/ repository only
    • Publisher's version/PDF cannot be used in institutional repository
    • Must link to publisher version
    • Published source must be acknowledged
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: We propose the design of a dual-anode electron gun, so named due to the presence of an additional electrode, namely, the control anode in the vicinity of the cathode in addition to the ion-barrier anode and the ground anode. We found the potential of the control anode to play an important role in enhancing the life of a space traveling- wave tube. By a telemetric command, one could control the control anode potential with a view to enhancing the cathode current that would otherwise deteriorate with the progress of time. Further, due care was taken in the thermal design by providing a heat shielding of the cathode of the proposed dual-anode gun to ensure that the cathode, which is operated at a lower temperature for a longer cathode life, does not further suffer a decrease in temperatures due to heat dissipation. Furthermore, to compensate for the deterioration of the cathode current with the progress of time, we propose the application of a nominal change in the control anode potential by a telemetric command. The electrostatic and thermal simulations of the proposed dual-anode gun were carried out by the commercial simulation codes EGUN and ANSYS, respectively. The paper presents the effect of heat shield thickness and material property on the cathode temperature as well as the effect of the structural deformation caused by the axial and radial expansion of the cathode on electron beam optics, a demountable dual-
    Journal of Electromagnetic Waves and Applications 09/2014;
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    ABSTRACT: Consider a cylindrical structure with an arbitrary core coated by a radially inhomogeneous layer in a general case. The core of the structure may be PEC, PMC, PEMC, impedance boundary, dielectric, or metamaterial. Contrary to the scattering problems of homogeneous media, scattering problems of inhomogeneous media do not have exact solutions except for special inhomogeneous profiles. In this paper, a general frequency domain method is proposed to analyze scattering from such structures on the basis of Taylor’s series concept for obliquely incident electromagnetic (EM) waves with arbitrary polarizations. The validity of the suggested method is verified by comparison with the exact solutions of some special profiles for the coating layer. Furthermore, a comparison is made between the proposed method and other commonly used methods in the literature, which confirms that the proposed method is general, fast, and has good convergence toward the solution. Moreover, as an application, we employed the method for optimization of the scattering echo width of a PEC cylinder.
    Journal of Electromagnetic Waves and Applications 07/2014;
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    ABSTRACT: In this article, a novel complementary triangular split ring resonator (CTSRR) using defected ground structure (DGS) is introduced. The unit is implemented in microstrip technology. The CTSRR has unique filter characteristics, including six dimension-dependent finite attenuation poles with wide bandgap, very high attenuation rate, and very low level of passband ripples. CTSRR units with different dimensions CTSRR units are cascaded together to design a high-performance low-pass filter (LPF) with a cutoff frequency (f c ) of 1.80 GHz. The designed LPF exhibits an attenuation rate of 250 dB/GHz and passband ripples of less than 0.30 dB. Moreover, it has a wide 20-dB stopband at up to 16.5 times f c . To our knowledge, this is the best obtained stopband value among the published results until now. The designed filter has been fabricated and validated using small signal parameter measurements. Excellent agreement is noticed between transmission coefficient measurements and its simulated counterpart using electromagnetic simulator.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(4):542-550.
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    ABSTRACT: Cavity model analysis is performed for 30°–60°–90° triangular microstrip antenna. Field expressions for various modes are given. Current is modeled as one dimensional ribbon to find the input impedance. Far field radiation patterns for fundamental mode are evaluated using equivalence principle. Results are verified with measures and/or 3D simulated data. It is found that our theory shows close agreement with measured and/or simulated data. It is much less complex and generalized in terms of modal analysis but at the same time more accurate than the other reported analytical techniques for the structure. It is believed that the results can be efficiently utilized to design broad-side 30°–60°–90° triangular microstrip antenna.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(1).
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    ABSTRACT: In this paper, a coplanar waveguide (CPW)-fed planar antenna with frequency tuning capability and broadband characteristic is proposed. The antenna consists of a CPW feeding line, an arrow-shaped stub, a rectangular aperture, and two symmetric square apertures carved on the ground plane. Based on the narrow slot etched out, two varactors are employed as tunable elements to load into the slot. With the configuration adopted, the low frequency narrow band and the high frequency wide band are obtained. Results show that the low frequency tunable channel ranging from 1.5 to 2.05 GHz is achieved while the high frequency wide band maintaining. Further, the measured radiation patterns and gains exhibit relatively stable characteristics.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(10).
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    ABSTRACT: A universal methodology for designing a ultra-wideband (UWB) diversity antenna is presented in this paper. The main advantage of the methodology is that by using only a familiar symmetrical UWB antenna, a UWB diversity antenna with a compact size, wide impedance bandwidth and good isolation between two feeding ports can be designed conventionally. Another advantage of the methodology is that the distance between two radiators is almost equal to the distance between two feeding lines, thus a complicated structure to decouple the mutual interaction between two radiators is not necessary in the antenna design, and the configuration of the UWB diversity antenna is simple. As an example, a UWB diversity antenna with a compact size of 36 mm × 36 mm operating at a frequency range of 3.1–10.6 GHz designed by using a circular disc monopole UWB antenna is constructed, measured and analysed. The simulated and measured results show that across the UWB, the antenna can achieve a broad impedance bandwidth with good isolation of Keywords: diversity antenna; mutual coupling; spatial diversity; ultra-wideband (UWB) Document Type: Research Article DOI: http://dx.doi.org/10.1080/09205071.2014.911667 Affiliations: 1: National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi’an, Shaanxi Province, 710071, P.R. China 2: Department of Radar Engineering School of Air and Missile Institute, Air Force Engineering University, Xi’an, Shaanxi Province, 710051, P.R. China Publication date: July 3, 2014 $(document).ready(function() { var shortdescription = $(".originaldescription").text().replace(/\\&/g, '&').replace(/\\, '<').replace(/\\>/g, '>').replace(/\\t/g, ' ').replace(/\\n/g, ''); if (shortdescription.length > 350){ shortdescription = "" + shortdescription.substring(0,250) + "... more"; } $(".descriptionitem").prepend(shortdescription); $(".shortdescription a").click(function() { $(".shortdescription").hide(); $(".originaldescription").slideDown(); return false; }); }); Related content In this: publication By this: publisher In this Subject: Engineering/Technology , Electricity & Magnetism , Physics (General) By this author: Zhao, Hui ; Zhang, Fushun ; Wang, Chunyang ; Zhang, Xiaokuan GA_googleFillSlot("Horizontal_banner_bottom");
    Journal of Electromagnetic Waves and Applications 01/2014; 28(10).
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    ABSTRACT: The performance of high frequency weather radars becomes questionable when the antenna system is enclosed by a radome because losses are more at higher frequency. To achieve high performance and accuracy, the radome wall and joints should be designed and optimized properly. Current manuscript presents the detailed study of A-sandwich radome wall and joint characteristics derived for polarimetric Doppler Weather Radar reflector antenna at X-band frequency. The diameter of the reflector antenna is 2.4 m which will be protected by a spherical A-sandwich radome of diameter 4.2 m. Radome wall is optimized by parametric variation of skin and core thickness using Floquet’s modal analysis in Ansoft HFSS Software package. Performances of radome panel with three different joint cross-sections have been compared in terms of insertion loss and phase variation and the best one is proposed for X-band antenna radome. Measurement was carried out at Compact Antenna Test Facility where the joint of two flat rectangular radome panels was hanged vertically in front of reflector antenna. Simulated results are compared with measured results to validate the proposed design.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(10).
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    ABSTRACT: In this paper, performance efficiency analysis of compressive inverse synthetic aperture radar (ISAR) imaging for a complex, electrically large target is presented. In this context, physical optics (PO) is used as a high-frequency scattered field prediction technique and compressive sensing (CS) theory is applied to ISAR imaging by exploiting the sparse point scatterer structure of the target. Results prove that CS provides high resolution and accuracy in ISAR imaging even under the Nyquist sampling rate and linearly decreases computational time.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(10).
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    ABSTRACT: In this work, a new approach for the optimization of the locking range of rationally synchronized oscillators (RSO) is presented. The proposed method is based on a non-linear optimization setup, easily implementable on commercial harmonic balance software packages, which involves two copies of the circuit. An auxiliary generator (AG) is connected to each copy. The AGs are used to set the working points of the two circuit copies around the limits of the locking range, through the control of the phase of the autonomous signals. A conventional optimization process is then used to increase the synchronization bandwidth by changing the working frequency of one or both AGs. The synchronization loci of the RSO will be calculated to determine the achieved locking range and to analyze its dependence with the amplitudes of the synchronizing harmonics.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(9).
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    ABSTRACT: This study presents a novel time-reversal approach to locate targets based on the spatial information from the space-frequency multistatic data matrix plus the maximum detection and signal subtraction. The cancellation operator enables us to cancel the echoes coming from preliminarily detected targets, and we can transfer the multitarget imaging program into a series of single-target ones. Therefore, the targets can be accurately focused in the new environment. The advantages of the new algorithm over the conventional multitarget imaging algorithm are demonstrated by several numerical simulations.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(3).
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    ABSTRACT: In this paper, equivalence principle algorithm (EPA) with grid-robust higher order vector basis (GRHOVB) is proposed to solve the multiscale problems. The EPA is a kind of domain decomposition method which transforms the interaction of objects into the interaction between virtual equivalence surfaces. Compared with traditional Curvilinear Rao–Wilton–Glisson function, GRHOVB can be used on the equivalence surface to reduce the number of unknowns and also to improve the accuracy. The tap basis is utilized to deal with current continuity when the object is intercepted by an equivalence surface. The equations are simplified further to improve the tap basis scheme. Moreover, to accelerate the solution, multilevel fast multipole algorithm is utilized in EPA. Numerical results are shown to demonstrate the accuracy and efficiency of the proposed method.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(11).
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    ABSTRACT: The characteristic basis function method (CBFM) is an efficient approach to analyze electromagnetic problems through the size reduction of the original matrix in the method of moments equation. However, adequate plane waves (PWs) must be set in each sub-block to construct characteristic basis functions (CBFs), thus increasing the number of CBFs and causing higher time consumption in singular value decomposition. In addition, the reduced matrix calculation procedure is time-consuming because numerous vector–matrix–vector products (VMVPs) are contained. To mitigate these problems, an improved CBFM is presented. This method fully considers the mutual coupling effects among sub-blocks to obtain the secondary level characteristic basis function (SCBF). Therefore, the number of PWs, as well as the number of CBFs, is significantly reduced. The fast dipole method is also used to accelerate the matrix–vector products in the construction of SCBFs and VMVPs in the calculation of the reduced matrix. Numerical results demonstrate that the proposed method is accurate and efficient.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(7).
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    ABSTRACT: In this paper, the surface plasmon modes and switching gaps of three-dimensional (3D) photonic crystals (PCs) with diamond lattices, which are composed of core isotropic dielectric spheres surrounded by plasma shells inserted in air, are theoretically investigated in detail based on a modified plane wave expansion method. The equations for computing band structures for such 3D PCs are presented. Our analyses show that the proposed double-shell structure can produce the complete photonic band gaps (PBGs) which can be worked as an optical switching by manipulating the parameters of such PCs. However, the switching state cannot be tuned by the plasma collision frequency. Numerical results also demonstrate that a flatbands region and the stop band gaps (SBGs) in the (1 0 0) and (1 1 1) directions which are above the flatbands region can be achieved. The SBGs also can be tuned by the parameters as mentioned above. There is also a threshold value for the thickness of plasma shell, which can make the band structures of the 3D PCs with double-shell structures similar to those obtained from the same PC structure containing the pure plasma spheres. In this case, the dielectric function of the inserted core sphere will not affect the band structures. It means that the PBGs can be achieved by replacing the pure plasma spheres with such double-shell structures to make fabrication possible and save the material in the realization. It is also noticed that the flatbands region is determined by the existence of surface plasmon modes, and the upper edge of flatbands region does not depend on the topology of lattice.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(11).
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    ABSTRACT: This paper introduces the class-E power amplifier with only the MOSFET nonlinear drain-to-source parasitic capacitance as a shunt capacitance for the class-E sub-nominal condition, i.e., zero-voltage-switching (ZVS) condition at any grading coefficient m of the MOSFET body junction diode and any duty ratio D. The obtained analytical expressions for waveforms and design equations show that the grading coefficient m and the duty ratio D can be used as the adjustment parameters, which increases the degree of the design freedom by two. The switch-voltage waveform does not satisfy the class-E switching condition when the grading coefficient m is different from the design specifications, which resulted in the power conversion efficiency degradation. On the other hand, the duty ratio D is determines the location of the class-E switching conditions. Therefore, the grading coefficient m and the duty ratio D are important parameters to satisfy the class-E sub-nominal condition. Although, the maximum operating frequency and the output power capability are affected by the duty ratio D, only the maximum operating frequency is affected by the grading coefficient m. We obtained the analytical expressions, which are validated by PSpice simulations and laboratory experiments that the grading coefficient m is considered. The measurement and PSpice simulation results agreed with the analytical expressions quantitatively, which show the validity of our analytical expressions.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(5).
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    ABSTRACT: This article, presents a reliability-based design optimization (RBDO) study for designing electromagnetic shielding structures. The existing deterministic design approaches do not integrate the uncertainty involved in the design variables or problem parameters of such shielding structures thereby, the ignorance of uncertainty provides variation in the expected shielding effectiveness (SE) in the optimized design solution. The application of RBDO allows determining the best design solution, while explicitly considering the inevitable effects of uncertainty in the design variables and problem parameters. The proposed approach employs a nested optimization approach for solving the RBDO formulation for the shielding structure under uncertainty. The real-coded genetic algorithm is being used to handle deterministic constraints (outer loop) whereas hybrid mean-value method is employed to evaluate probabilistic constraints in the RBDO formulation (inner loops). The approach is illustrated with an example considering three-layered shielding structures’ design for the SE requirement of ~80 dB in 8–12.5 GHz frequency range.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(6).
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    ABSTRACT: In this paper, a novel design of wideband compact patch antenna is proposed for the handheld application of global navigation satellite system (GNSS). In order to meet the size requirement of the handheld application, the shorting load is employed as the miniaturization technique and the overall size of the proposed antenna is only 70 mm (length) × 70 mm (width) × 25 mm (height). Due to the narrow bandwidth of the shorting loaded patch antenna, shorting probe with enlarged width, as well as the air substrate, is adopted to enhance the bandwidth of the proposed antenna and make it fulfil the GNSS bandwidth requirement. Simulation and measured results show that the proposed antenna has a bandwidth of 41.5% for VSWR Keywords: circularly polarization; global navigation satellite system; shorting probe loaded patch antenna; wideband antenna Document Type: Research Article DOI: http://dx.doi.org/10.1080/09205071.2014.932259 Affiliations: Science and Technology on Antennas and Microwaves Laboratory, Xidian University, Xi’an, Shaanxi, 710071, P.R. China Publication date: August 13, 2014 $(document).ready(function() { var shortdescription = $(".originaldescription").text().replace(/\\&/g, '&').replace(/\\, '<').replace(/\\>/g, '>').replace(/\\t/g, ' ').replace(/\\n/g, ''); if (shortdescription.length > 350){ shortdescription = "" + shortdescription.substring(0,250) + "... more"; } $(".descriptionitem").prepend(shortdescription); $(".shortdescription a").click(function() { $(".shortdescription").hide(); $(".originaldescription").slideDown(); return false; }); }); Related content In this: publication By this: publisher In this Subject: Engineering/Technology , Electricity & Magnetism , Physics (General) By this author: Sun, Chao ; Zheng, Huili ; Zhang, Lingfei ; Liu, Ying GA_googleFillSlot("Horizontal_banner_bottom");
    Journal of Electromagnetic Waves and Applications 01/2014; 28(12).
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    ABSTRACT: Antenna array synthesis sometimes involves both real and integer parameters as a mixed integer optimization problem. In this paper, a modified particle swam optimization (PSO) algorithm is proposed in order to deal with real and integer variables in a unified manner. Two major modifications are made compared to the classical PSO algorithm. First a unified vector having continuous values between 0 and 1 is defined, and at each iteration this vector (or part of it) is mapped to real variables and/or rounded to integer variables, which makes the updating process unified for any type of parameters. Second, random ternary variables are introduced to compensate quantization errors caused by the rounding-off operations, which could accelerate the speed of convergence and lead to improved topology exploration capability. In order to demonstrate the effectiveness of the proposed method, three previous examples about antenna array synthesis are revisited, and better results than those in the existing literatures are obtained in all these examples.
    Journal of Electromagnetic Waves and Applications 01/2014; 28(6).

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