bluuebunny/crossref_metadata_2025_split huggingface dataset:
A 80–100 GHz image‐reject passive‐HEMT mixer
Authors: Archer John W. 
Published: September 2006

AbstractThis paper describes a single‐sideband, subharmonically pumped, passive‐HEMT integrated circuit mixer developed for use in transceivers for point‐to‐point telecommunications in the 83–87 GHz band. The gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) can readily be fabricated using a standard commercial process. The mixer performs equally well for either up‐ or down‐ conversion. For RF signals in the range 80–100 GHz, the conversion loss is typically 20 dB with LO drive in the range 40–50 GHz. Under these conditions, high rejection of the undesired sideband (>18 dB), relative to the desired signal, is achieved. For up‐conversion, 1 dB compression of the mixer gain typically occurs at −12 dBm RF output power. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2429–2433, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21953
Band‐notched ultra‐wideband slot antenna
Authors: Pan Chin‐Ju , Lee Chungnan , Huang Chih‐Yu , Lin Hsiao‐Cheng 
Published: September 2006

AbstractThis work presents a band‐notched ultra‐wideband (UWB) circular slot antenna free from interference with existing wireless systems. The antenna has an indented circular stub embedded inside the circular slot. The desired band‐notched UWB operation can be obtained by choosing the size of the pie‐slot cut in the circular stub. Details of the proposed design and experimental results of the constructed antennas are presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2444–2446, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21958
Electromagnetic interaction between resonant loop antenna and simulated biological tissue
Authors: Curto S. , Ammann M. J. 
Published: September 2006

AbstractThe electromagnetic interaction between a resonant loop antenna in proximity to biological tissue is examined in terms of field components, wave impedance, return loss, efficiency, and specific absorption rate (SAR). Various loop orientations are investigated with respect to the tissue, in order to provide the best coupling and power deposition into the body. An evaluation in terms of antenna detuning is also made. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2418–2421, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21959
CPW‐fed octave band slot antenna
Authors: Rao Patnam Hanumantha 
Published: September 2006

AbstractIn this paper, a compact coplanar waveguide‐fed slot antenna that can operate over an octaveband (1.75–3.7 GHz) is presented. The novelty of this antenna is the wideband operation with the radial stub loading. The front‐to‐back ratio of the antenna with a back plate is better than 25dB in H‐plane and better than 18 dB in E‐plane. The cross polarization level is around −20 dB over the band and the worst being at −15 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2405–2408, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21963
Efficient near‐field to far‐field transformation from plane‐polar samples
Authors: Costanzo Sandra , Di Massa Giuseppe 
Published: September 2006

AbstractThe problem of rapid far‐field computation from near‐field samples acquired on a plane‐polar geometry is addressed in this paper. A fast processing algorithm is developed which uses the fast Fourier transform and the related shift theorem, by exploiting the convolution property of the radiation integral giving the antenna far‐field pattern. Numerical and experimental examples are discussed to prove the effectiveness of the proposed procedure. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2433–2436, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21964
Band‐notched ultra‐wideband square slot antenna
Authors: Chen Horng‐Dean , Li Jui‐Ni , Huang Yuh‐Fung 
Published: September 2006

AbstractAn ultra‐wideband (UWB) square slot antenna with a band‐notched characteristic is presented. The proposed antenna has a simple configuration and is easy to construct. The ultra‐wideband operation is realized by loading an offset rectangular stub at the end of the microstrip feed line. The band‐notched characteristic is achieved by embedding an U‐like slot in the rectangular stub. The notched frequency band can be controlled by adjusting the length of the U‐like slot. A design example for an UWB (3.1–10.6 GHz) square slot antenna with a notched frequency band at 5 GHz is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2427–2429, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21966
Patch‐type radio frequency identification tag antenna mountable on metallic platforms
Authors: Kim Sung‐Joo , Yu Byunggil , Chung Young‐Seek , Harackiewicz France J. , Lee Byungje 
Published: September 2006

AbstractThe simple and compact passive radio frequency identification (RFID) tag antenna mountable on metallic platforms is proposed. Without major modification of the radiating element and for easy impedance matching with various microchip impedances, an antenna is inductively coupled to a novel feeding structure placed on the side of a radiating patch. Using the commercial RFID system, radiation pattern and maximum distance are measured. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2446–2448, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21969
A new planar circular disc‐and‐ring monopole antenna for UMTS/UWB dual‐network applications
Authors: Kang Yu‐Cheng , Chiu Cheng‐Nan , Deng Sheng‐Ming 
Published: September 2006

AbstractA new, low‐profile planar circular disc‐and‐ring monopole antenna is proposed for dual‐band and ultra‐wideband (UWB) operations. The first band is specified for the universal mobile telecommunication system (UMTS, 1.92–2.17 GHz) and the second is for the FCC‐defined UWB system (3.1–10.6 GHz). A prototype of the antenna has been constructed and demonstrates optimal performance. Measured and simulated return loss and measured radiation patterns have been obtained. Sufficient impedance bandwidth and omni‐directional radiation performance in both bands have been observed and show promise for the UMTS/UWB dual‐network applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2396–2399, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21970
Stable ns pulses generation from cladding‐pumped Yb‐doped fiber laser
Authors: Shuling Hu , Guangrong Yang , Yu Jing , Chunqing Gao , Guanghui Wei , Fuyun Lu 
Published: September 2006

AbstractIn this paper the generation of stable ns pulses by a laser diode pumped Yb‐doped double‐clad fiber laser is demonstrated. The fiber laser with two‐mirror cavity operates in a self‐Q‐switching regime, the Q‐switch mechanism of which is based on stimulated Brillouin scattering (SBS). With different reflectivity of the second mirror, stable, pulse width ranging of 10 ns to less than 2 ns pulses are obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2442–2444, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21973
Internal GSM/DCS/PCS antenna for USB dongle application
Authors: Wong Kin‐Lu , Kuo Cheng‐Hao 
Published: September 2006

AbstractA GSM/DCS/PCS internal antenna suitable to be embedded at the widened end portion of a promising USB dongle for wireless network access in a laptop computer is presented. The proposed internal antenna uses two separate resonant strips folded into a compact structure to generate two wide operating bands at about 900 and 1800 MHz to cover the GSM and DCS/PCS operations. In addition, although in a compact structure, the antenna's two resonant strips are designed to be less coupled, thus allowing the antenna's lower and upper bands to be adjusted separately, without affecting each other. Details of the USB dongle embedded with the proposed internal antenna are described, and experimental results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2408–2412, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21974
Generic microstrip structure for the realization of all‐type broadband filters
Authors: Gündüz Sibel , Çakir Gonca , Sevgi Levent 
Published: September 2006

AbstractA generic microstrip structure is used for the design of all‐type broadband filters, based on the analogy between wave and transmission line theories. A Matlab‐based lumped (LC) and scattered (microstrip line) filter design tool is developed for the automation of the filter design. Sample lowpass, highpass, bandpass, and bandstop filters are designed and their operational characteristics are validated via in‐house prepared FDTD‐based virtual microstrip circuit simulator. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2390–2393, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21975
A microstrip‐fed quasi‐rhombus shape double dipole antenna for wideband phased array applications
Authors: Eldek Abdelnasser A. , Zheng Guiping 
Published: September 2006

AbstractIn this paper, the regular microstrip dipole antenna shape is modified by adding upper and lower triangular patches, which makes it look like a rhombus. The rhombus shape is chosen because of its wideband characteristics over the rectangular one. The presented antenna provides a wide bandwidth of more than 100%. The measured and computed VSWR and radiation patterns for one element and the mutual coupling for two elements are presented in the paper. The proposed antenna provides endfire radiation patterns with wide beamwidth and low cross polarization level which make it a good candidate for phased arrays and radar systems. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2461–2464, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21978
Ultra wideband embedded planar inverted conical antenna
Authors: Gupta Sachin , Ramesh M. , Kalghatgi A. T. 
Published: September 2006

AbstractA compact CPW fed planar inverted conical antenna with coplanar ground embedding the radiator has been studied with regard to its suitability for the UWB transceivers operating over 3.1–10.6 GHz. Performance of planar inverted conical antenna embedded in a similar shaped ground plane is compared with the planar inverted conical antenna having ground in plane with the radiator. Results from the simulations have been validated through experimentations. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2465–2468, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21980
Metamaterial inclusions based on grid‐graph Hamiltonian paths
Authors: Pierro Vincenzo , McVay John , Galdi Vincenzo , Hoorfar Ahmad , Engheta Nader , Pinto Innocenzo M. 
Published: September 2006

AbstractThis article deals with a study of novel classes of metamaterial inclusions based on space‐filling curves. The graph–theoretic Hamiltonian‐path (HP) concept is exploited to construct a fairly broad class of space‐filling curve geometries that include as special cases the well‐known Hilbert an Peano curves whose application to metamaterial inclusions has recently been proposed. In this framework, the basic properties of HP are briefly reviewed, and a full‐wave study of the electromagnetic properties of representative grid‐graph HP geometries is carried out. Applications to metamaterial inclusions are explored, with focus on artificial magnetic conductors with reduced polarization‐sensitivity. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2520–2524, 2006; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.21982
Switching of electrical and magnetic resonances in Omega structures by a reflection operation experimental studies
Authors: Varadan Vasundara V. , Ro Ruyen , Penumarthy Sravanthi 
Published: September 2006

AbstractOmega shaped metallization on a dielectric substrate if appropriately designed will exhibit plasmonic resonances when excited by microwaves. We present experimental results for the complex S‐parameters for four types of metamaterial slabs constructed with discrete omega shapes in a rectangular lattice. A double layer of omega shapes in a rectangular lattice is obtained by reflecting the pattern of one strip by +180° (Omega A), the third sample is realized by reflecting one strip by −180° (Omega B) and the fourth sample (Omega C) is realized by an alternate arrangement of the Omega A and Omega B samples in a rectangular lattice. The single layer sample is asymmetric (S11 ≠ S22), the two mirror image pair samples are perfectly symmetric with S11 = S22. Plasmonic resonances and band gaps were observed. The complex S‐parameters were used to extract the complex permittivity and permeability of the symmetric samples by inverting Fresnel formulae for the reflection and transmission coefficients of a planar slab normally illuminated by a plane wave. The data of the asymmetric sample was inverted with this procedure to obtain two sets of data, one set using S11 and S21 and another set using S22 and S12 for the extraction of complex parameters. A reflection operation on the Omega geometry by ±180° results in the switching of the electric and magnetic properties in certain frequency ranges. Band gaps have been observed for both Omega A and Omega B that coincide with short circuit regions for the real part of the impedance. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2624–2629, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21984
High‐gain wideband low‐profile antenna
Authors: Mateos Rosa M. , Craeye Christophe , Toso Giovanni 
Published: September 2006

AbstractWhen trying to increase the bandwidth of antennas based on high‐impedance surfaces, the radiation pattern tends to split near the resonance frequency of the artificial perfect magnetic conductor (PMC). This problem is solved here by reducing the size of the PMC in the E‐plane and by making it nonperiodic in the H‐plane. Using a dual‐dipole as a radiating element, a 30% impedance bandwidth is achieved with directivity larger than 9 dB over the whole useful band. In view of the antenna's horizontal dimensions, this is close to the maximum achievable directivity. The total antenna height is 0.15λ, where λ corresponds to the wavelength at the highest frequency. A study of the surface currents on the patches supports the phenomena observed on the radiation patterns. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2615–2619, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21987
FMM and FDTD analysis of a woodpile 3D‐EBG superstrate for patch antennas
Authors: Frezza F. , Nocito P. , Pajewski L. , Schettini G. 
Published: September 2006

AbstractA fast and accurate modeling of the transmission and reflection properties of 3D‐EBGs can be performed by exploiting a Fourier modal method (FMM), which in the literature is regarded as the most efficient and prevailing rigorous technique for the analysis of doubly‐periodic gratings. Putting a woodpile EBG superstrate on a customary microstrip‐patch feed, an antenna with highly directional radiation pattern can be obtained. The ensemble constituted by the perfectly conducting plane and the woodpile EBG can be schematized by means of an equivalent resonating all‐dielectric structure, which has been studied by using our FMM tool for 3D‐EBGs. Subsequently, the behavior of the whole radiating device has been checked with a finite difference time domain technique. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2595–2598, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21991
Modeling of spatial gap solitons in nonlinear waveguide arrays
Authors: Armaroli A. , Valentini S. , Bellanca G. , Trillo S. 
Published: September 2006

AbstractWe discuss the modeling of self‐trapping in arrays of evanescently coupled optical waveguides with Kerr nonlinear response, contrasting two different approaches. Our results show that the coupled mode equations describe with good accuracy, in a wide range of the parameter values of physical interest, the gap soliton self‐trapped solutions that can propagate from beams interfering at Bragg angles. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2591–2595, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21992
Basic radiation properties of waveguides filled with uniaxial single‐negative metamaterials
Authors: Hrabar Silvio , Jankovic Gordan 
Published: September 2006

AbstractBasic radiation properties of miniaturized open‐ended waveguide radiators based on anisotropic, either mu‐negative (MNG) or epsilon‐negative (ENG) fillings, have been investigated experimentally. It was found that a resonant MNG filling offers a high degree of antenna miniaturization with narrowband operation and pronounced losses, a wire‐based ENG filling offers low degree of miniaturization with very low losses, while the ENG filling based on inductively loaded wires offers both high degree of miniaturization and low‐loss operation. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2587–2591, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21993
MEMS‐based high‐impedance surfaces for millimeter and submillimeter wave applications
Authors: Chicherin Dmitry , Dudorov Sergey , Lioubtchenko Dmitri , Ovchinnikov Victor , Tretyakov Sergei , Räisänen Antti V. 
Published: September 2006

AbstractThe authors propose to use microelectromechanical systems (MEMS) to produce novel phase shifters based on an electronically reconfigurable high‐impedance surface (HIS). Typically, HIS is a textured metal surface with reactive impedance varying from an initial value to a very high value. Such phase shifters can be developed with introducing a surface with variable impedance in, e.g., a rectangular metal or dielectric rod waveguide. Placed along narrow walls of the rectangular metal waveguide or adjacent to the dielectric waveguide, the HIS affects the propagation constant, which results in changing the phase of the propagating wave. The authors manufactured a prototype of the microelectromechanical systems‐based HIS consisting of a dielectric layer placed on a ground plane, and two arrays of metal patches. The gap between the upper and lower arrays of patches was fixed and filled with SiO2. The measured phase of the wave reflected from the prototype HIS varies in the range of 50°, and its insertion loss is below 0.5 dB (out of resonance). © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2570–2573, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21997
Microwave harmonic emission in MgB2 superconductor: Comparison with YBA2CU3O7
Authors: Gallitto A. Agliolo , Bonsignore G. , Di Gennaro E. , Giunchi G. , Vigni M. Li , Manfrinetti P. 
Published: September 2006

AbstractWe report results of microwave second‐harmonic generation in ceramic samples of MgB2, prepared by different methods. The SH signal has been investigated as a function of the temperature and the static magnetic field. The results are discussed in the framework of models reported in the literature. We show that the peculiarities of the SH signal are related to the specific properties of the sample. A comparison with the results obtained in ceramic and crystalline YBa2Cu3O7 shows that the second‐harmonic emission in MgB2 is weaker than that observed in ceramic YBa2Cu3O7. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2482–2486, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22001
High directivity in low‐permittivity metamaterial slabs: Ray‐optic vs. leaky‐wave models
Authors: Lovat Giampiero , Burghignoli Paolo , Capolino Filippo , Jackson David R. 
Published: September 2006

AbstractA study is presented on the directivity of grounded low‐permittivity metamaterial slab structures that achieve highly directive broadside radiation. Two‐dimensional (2D) configurations excited by electric line sources are considered, adopting a scalar plasma‐like dispersive permittivity for the metamaterial medium that suitably models a wire medium in the presence of a 2D electromagnetic field, with the electric field directed along the wire axes. The role of leaky waves in producing the high directivity attainable with such structures is illustrated by comparing it with a simple ray‐optic model for the radiation mechanism. We show how for increasing substrate heights, the leaky‐wave effect (dominant for “optimal” thicknesses, and responsible for the very high directivity) evolves into a lensing effect purely explained with ray‐optics, when losses are present. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2542–2548, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22004
Multiband planar antennas on electromagnetic bandgap substrates: Complex global optimization of the structure
Authors: Horák Jiří , Chmela Petr , Oliva Lukáš , Raida Zbyněk 
Published: September 2006

AbstractThe paper presents a complex global optimization of a four‐band planar antenna on an electromagnetic bandgap substrate. As a typical representative of such antennas, a triple U‐slot patch antenna is chosen. The full‐wave model of the antenna is developed in CST Microwave Studio. Simulation results are exported to macros in Visual Basic, and the structure is optimized by the particle swarm algorithm, which simultaneously changes parameters of the substrate and the layout. As an optimization criterion, impedance matching in the GSM bands and the Bluetooth one is considered. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2532–2534, 2006; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22006
Time‐domain characterization of antennas in metamaterial media
Authors: Raida Zbyněk , Láčík Jaroslav , Horák Jiří , Chmela Petr , Oliva Lukáš 
Published: September 2006

AbstractIn this article, a wire dipole embedded within a double‐negative medium is numerically analyzed using the time‐domain integral equation method. The antenna is excited by a narrow Gaussian pulse to obtain responses within a wider frequency band. The transient current distribution on the antenna is processed so as to obtain a time‐domain radiation pattern and to compute the gain. Time‐domain parameters are obtained by calculating mean‐value quantities, which are then compared with the conventional frequency‐domain parameters, using Parseval's theorem. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2530–2532, 2006; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22007