bluuebunny/crossref_metadata_2025_split huggingface dataset:
The wide‐band scattering characteristics analysis of the satellite targets in different space attitude conditions
Authors: Rui Zeng , Lezhu Zhou , Mingzhi Li , Wei Wang 
Published: March 2008

AbstractWide‐band scattering properties of typical spin stabilized satellite and triaxial stabilized satellite are computed by using finite‐difference time‐domain (FDTD) in this study. Compacts of the attitudes on scattering properties are investigated. The results show the change of rolling attitude more easily arouses the variety of scattering characteristic of satellite target than pitch attitude change does. The calculation results may be helpful to the wide band radar for detecting, identifying, and tracking of the satellite targets. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1294–1300, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23353
Adaptive‐network‐based fuzzy inference system models for input resistance computation of circular microstrip antennas
Authors: Guney K. , Sarıkaya N. 
Published: March 2008

AbstractA method based on adaptive‐network‐based fuzzy inference system (ANFIS) for computing the input resistance of circular microstrip antennas (MSAs) is presented. The ANFIS is a class of adaptive networks which are functionally equivalent to fuzzy inference systems (FISs). Seven optimization algorithms, least‐squares, nelder‐mead, genetic, differential evolution, hybrid learning, particle swarm, and simulated annealing, are used to determine optimally the design parameters of the ANFIS. The results of the ANFIS models show better agreement with the experimental results, as compared with the results of previous methods available in the literature. When the performances of ANFIS models are compared with each other, the best result is obtained from the ANFIS model trained by the least‐squares algorithm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1253–1261, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23354
Investigation of a compact and broadband balun
Authors: Li Jia‐Lin , Qu Shi‐Wei , Xue Quan 
Published: March 2008

AbstractInvestigations indicate that the bandwidth and circuit size of a conventional branch‐line balun can be improved, where the bandwidth improvement is achieved by introducing a quarter‐wavelength short‐stub at one of the output ports and the size reduction is implemented by meandering the branches of a conventional balun. In this article, a planar balun with broadband bandwidth and compact size is proposed and confirmed, theoretically and experimentally. The results show that a circuit area is reduced to 47.4%, and when referring to a phase difference of ±10°, a flat coupling of over 30% is achieved from measurements, and within this phase difference, the magnitude imbalance is maintained within ±0.25 dB. Both simulated results and measured data are presented, and a good performance is observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1380–1384, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23361
Electronically tunable broadband E‐shaped patch antenna
Authors: Ansari J. A. , Brij Ram Ram 
Published: March 2008

AbstractAn electronically tunable broadband E‐shaped patch antenna (ESPA) is proposed and analyzed using equivalent circuit concept. The effects of notch parameters such as notch length, width, and position are analyzed to select the optimum values for broadband operation of ESPA. Under the optimum conditions of ESPA, the effect of bias voltage of tunnel diode on the performance of the antenna is also analyzed. The theoretical investigations of the proposed antenna reveal that the tunable band of operation between 1.055 GHz (bandwidth 42.54%) and 1.324 GHz (bandwidth 49.77%) can be achieved by adjusting the bias voltage only. It is noted that the radiative power of the proposed antenna can be enhanced up to 5.67 dB as compared with the E‐shaped patch antenna. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1341–1347, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23362
A uniform evaluation of the PO integral for 2D cylinders with arbitrary contour
Authors: Bondia Felipe Vico , Bataller Miguel Ferrando , Daviu Eva Antonio , Escuderos Daniel Sánchez 
Published: March 2008

AbstractA new 2D fast physical optics method is presented for computing the field diffracted by a conducting cylinder with arbitrary contour. This method produces a fast solution with uniform accuracy in all frequencies and incidence/observation angles. The method is a combination of different techniques such as path deformation, Morse theory, and Fourier LS continuation. The technique presented here is also valid and uniformly accurate near the caustic singularities produced by surface points with infinite curvature radius. This method also takes into account the endpoint contributions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1418–1423, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23364
Decorrelation of two closely spaced antennas with a metamaterial AMC surface
Authors: Ferrer P. J. , González‐Arbesú J. M. , Romeu J. 
Published: March 2008

AbstractA metamaterial spacer to decorrelate two closely spaced antennas has been designed and tested. The metamaterial spacer exhibits an artificial magnetic conductor (AMC) behavior around 2.6 GHz. Its performance has been checked against a simple metal spacer (PEC), providing a quasi orthogonal radiation pattern and good results in terms of decoupling and decorrelating a two‐antenna system. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1414–1417, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23365
Design of coupling structures for groove guide resonators
Authors: Bechteler Thomas F. , Kustepeli Alp , Bechteler Sevinc A. 
Published: March 2008

AbstractThree different coupling structures for a groove guide resonator operating at 10 GHz are investigated. First, propagatable modes are determined analytically. Then, the efficiency of the coupling structures is investigated by means of the method of moments and measurements. Finally, a groove guide resonator is designed and the resonance spectrum for each coupling structure is computed numerically, applying the finite‐difference time‐domain method. Numerical results are compared with experimental measurements. There is good agreement between the measured and simulated data. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1406–1410, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23372
Negative reflection in a Faraday chiral medium
Authors: Mackay Tom G. , Lakhtakia Akhlesh 
Published: March 2008

AbstractThe four wave numbers associated with planewave propagation in a Faraday chiral medium (FCM) with relatively huge magnetoelectric coupling give rise to enhanced possibilities for negative‐phase‐velocity propagation and, therefore, negative refraction. They can also give rise to the phenomenon of negative reflection. In particular, for a nondissipative example, we deduced that an incident planewave with positive/negative phase velocity can result in a negatively reflected planewave with negative/positive phase velocity, as well as a positively reflected planewave with positive/negative phase velocity. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1368–1371, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23373
Advanced design methods for a high efficiency Doherty power amplifier
Authors: Chen Xiaoqun , Guo Yuchun , Shi Xiaowei 
Published: March 2008

AbstractIn this study, a special inverted Doherty topology and uneven power drive methods are proposed to optimize the efficiency and appropriate load modulation. The amplifier is optimized at large power back‐off. The power added efficiency and adjacent channel leakage ratio (ACLR) are 33.1% and −47 dBc, which improve by 3.2% and 5 dB, respectively, and its third‐order intermodulation distortion (IMD3) has 2 .5 dB improvement compared with conventional Doherty power amplifier. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1330–1333, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23375
Design and realisation of low loss air‐filled rectangular coaxial cable with bent quarter‐wavelength supporting stubs
Authors: Ke Maolong , Wang Yi , Lancaster Michael 
Published: March 2008

AbstractA new type of rectangular coaxial cable, operating from 28 to 48 GHz, was designed and fabricated with thick SU8 photoresist technology. Two pairs of bent quarter‐wavelength supporting stubs were proposed to reduce the lateral dimension of the structure. A size reduction of 40% was achieved by using the bent supporting stubs design as compared with a similar one with straight supporting stubs design. An average insertion loss of 0.36 dB across the bandwidth of 28‐48 GHz was achieved, with return loss of better than − 14 dB. The use of bent supporting stubs did not compromise its microwave performance. The component is, therefore, particularly appealing for integrated components such as complex couplers or Butler matrix, where overall size reduction (with no loss of performance) and cost saving can be substantial. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1443–1446, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23377
Analysis of dielectric resonator antenna excited by a slot at the waveguide shorted end
Authors: Abdulla P. , Kakade Anandrao B. , Singh Y. K. , Chakrabarty A. 
Published: March 2008

AbstractHemispherical dielectric resonator (HDR) antenna excited with a slot at the short circuited end of waveguide is analyzed theoretically and verified experimentally. The analysis is based on numerical solution of coupled integral equations discretized using the method of moments (MoM). The HDR is modeled using exact magnetic field Green's function because of the equivalent magnetic current in the slot. The field inside the waveguide is expressed in terms of modal vectors and modal functions. For the analysis of HDR antenna part, the modal series is represented as a sum of particular and homogeneous solutions. The particular solution is computed efficiently using spectral domain approach. The scattering parameter for the HDR antenna loaded at the waveguide end slot is calculated and compared with measured and finite element method (FEM) results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1356–1359, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23382
Determination of metallic ring FSS scattering characteristics using WCIP method
Authors: Titaouine M. , Neto A. Gomes , Baudrand H. , Djahli F. 
Published: March 2008

AbstractWave concept iterative procedure (WCIP) is used for the determination of scattering characteristics of single and double metallic ring frequency selective surfaces (FSS). In the WCIP method, the analysis of the FSS is reduced to that of the unit cell. Basically, the WCIP method consists of scattering the incident waves at the interface and the reflection of the scattered waves by the closing ends of the periodic wall box containing the FSS unit cell. The use of the two dimensional fast Fourier transform algorithm results in a reduction of the running time and memory space. FSSs based on single and double metallic rings are analyzed by the WCIP method. A good agreement is observed between the WCIP results and the experimental results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1324–1328, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23383
Broadband differential fed integrated antenna
Authors: Mok Siu Yee , Mok Ka Tsun , Chan Wing Shing , Li Chung Wai 
Published: March 2008

AbstractA broadband differential fed integrated antenna operating between 0.9 and 2.3 GHz suitable for future software defined radios is presented in this article. Two distributed amplifiers in push‐pull configuration are connecting directly to a modified differential fed bow‐tie antenna, which also performs the dual function of signal combining and radiation. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1320–1324, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23384
Enhanced GMRES method combined with MLFMA for solving electromagnetic wave scattering problems
Authors: Rui P. L. , Chen R. S. 
Published: March 2008

AbstractFor efficiently solving large dense complex linear systems that arise in the electric field integral equation (EFIE) formulation of electromagnetic wave scattering problems, the multilevel fast multipole algorithm (MLFMA) is used to speed up the matrix vector product operations, and the sparse approximate inverse (SAI) preconditioning technique is employed to accelerate the convergence rate of the generalized minimal residual (GMRES) iterative method. We show that the convergence rate can be greatly improved by augmenting to the GMRES method a few eigenvectors associated with the smallest eigenvalues of the preconditioned system. Numerical experiments indicate that this new variant GMRES method is very effective with the MLFMA and can reduce both the iteration number and the computational time significantly. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1433–1439, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23385
Low‐loss doubly metallized CPW low‐pass filter with additional transmission zeroes
Authors: Balalem Atallah , Machac Jan , Kim‐Fai Wong , Omar Abbas 
Published: March 2008

AbstractThis article modifies the classical CPW low‐pass filter to doubly metallized CPW, by implementing metallic patches at the backside of the substrate. Moreover, transmission zeroes are introduced by using single, dual, and tri‐resonant stubs. These stubs are built on the rear side of the substrate. The filters are compact in distinction to the standard CPW low‐pass filter and have a very low loss compared with some other structures. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1431–1433, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23386
Design of a diversity antenna with stubs for UWB applications
Authors: Hong Seokjin , Chung Kyungho , Lee Jaewon , Jung Sangwook , Lee Sang‐Sun , Choi Jaehoon 
Published: March 2008

AbstractA two‐element diversity planar antenna for a multiple‐input multiple‐output application is proposed. By adopting two Y‐shaped radiators, the antenna provides wideband impedance matching characteristics over the desired frequency band. To reduce the mutual coupling between two radiating elements, three stubs are inserted in the ground plane. Good impedance matching and improved isolation characteristics are observed. The measured impedance bandwidth of the proposed antenna ranges from 2.27 GHz to 10.2 GHz for a return loss of less than 10 dB. Parametric analysis has been conducted to investigate the effect of radiator length and the insertion of stubs on the impedance bandwidth and isolation characteristics. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1352–1356, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23389
Bandpass filter with improved spurious performance using modified ring dielectric resonator in MIC environment
Authors: Srivastava Kumar Vaibhav , Mishra Vishwa V. , Biswas Animesh 
Published: March 2008

AbstractA C‐band bandpass filter is designed using modified ring dielectric resonator in microwave integrated circuit (MIC) environment for improved spurious response. The dielectric resonator (DR) filters are generally made in cavity environment because of its good spurious response in cavity environment, but its spurious performance degrades as the filter is designed in MIC environment. In MIC environment, the smaller substrate thickness makes DR closer to ground plane and affects its resonance mode spectrum which, in turn, affects closely spaced resonant frequencies. The dense resonant mode spectrum of DR in MIC environment limits its application for filter designing. This article introduces a comparative study on filter realization with modified ring DR and conventional ring DR to show the improvement of spurious response in MIC environment. The simulated and measured results of these filters are presented to demonstrate the validity of the design procedure and improvement of spurious response. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1426–1431, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23391
A modified high linearity CMOS micromixer for UWB systems
Authors: Lin Shui‐Yang , Yang Li‐Wu , Sun Xiao‐Wei 
Published: March 2008

AbstractA CMOS Micromixer for 3–5 GHz UWB receivers is presented in this article. Modified class‐AB input stage is developed to improve the LO/RF, LO/IF isolation and to reduce the mixer's noise figure. A LO buffer and an output buffer are integrated in it for on‐wafer testing. Our measurement results show that, with a 50‐Ω output loaded, it can achieve 5‐dB power conversion gain, 12.5 dB SSB NF, and 4 dBm IIP3. The mixer‐core consumes 2.6 mA of current from 1.8‐V power supply, and the on‐chip area occupied by this mixer with pads excluded is only about 350 × 400 μm2. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1463–1466, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23395
Erratum: Iterative implementation of approximate solutions for electromagnetic scattering
Authors: Nakhkash M. 
Published: March 2008

AbstractOriginally published Microwave Opt Technol Lett 49: 2425–2429, 2007. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1716, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23399
Electromagnetic smart screen for tunable transmission applications
Authors: Liu L. , Matitsine S. , Tan P. K. 
Published: March 2008

AbstractElectromagnetic smart screen containing conductive strip array loaded with pin diodes was investigated with numerical and experimental approaches. Transmission coefficient was simulated using finite element method with validation by free space measurement. Tunable EM properties are observed between 3 and 8 GHz, which can be useful for antenna applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1510–1514, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23400
Broadband parametric representation of packaged MEMS interconnects using a state space spectral model
Authors: Naishadham K. , Muldavin J. , Piou J. E. 
Published: March 2008

AbstractThis article presents a robust measurement‐based spectral model, derived from an all‐pole state‐space system representation of the scattering parameters, for the broadband characterization of low‐loss packaged MEMS circuits. The proposed method is illustrated by extracting distributed transmission line parameters of a MEMS interconnect, which accounts for discontinuities and package‐specific parasitic effects. It is shown that the state space method (SSM) effectively filters out measurement noise and facilitates extraction of frequency‐dependent parameters. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1482–1485, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23402
High‐speed divide‐by‐4/5 prescalers with merged and gates using GaInP/GaAs HBT and SiGe HBT technologies
Authors: Wei Hung‐Ju , Meng Chinchun , Chang YuWen , Lin Yi‐Chen , Huang Guo‐Wei 
Published: March 2008

AbstractThis paper demonstrates the divide‐by‐4/5 prescalers with merged AND gates in 2‐μm GaInP/GaAs heterojunction bipolar transistor (HBT) and 0.35‐μm SiGe HBT technologies. By biasing the HBT near the peak transit‐time frequency (fT), the maximum operating frequency of a D‐type flip‐flop can be promoted. At the supply voltage of 5 V, the GaInP/GaAs prescaler operates from 30 MHz to 5.2 GHz, and the SiGe prescaler has the higher‐speed performance of 1–8 GHz at the cost of power consumption. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1498–1500, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23407
IMPATT diode integrated annular ring microstrip antenna
Authors: Kanaujia Binod K. , Singh A. K. , Vishvakarma B. R. 
Published: March 2008

AbstractA theoretical investigation of IMPATT diode integrated annular ring microstrip antenna is proposed. In which the resonance frequency is controllable by means of bias voltage of IMPATT diode without altering the radii of annular ring. The investigations based on cavity model approach and results also simulated using MOM‐based IE3D simulator are carried out. The maximum frequency agility is found to be 10 MHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1491–1495, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23409
Internal ultra‐wideband slot antenna with a stepped ground plane
Authors: Lin Shun‐Yun , Huang Hong‐Ren 
Published: March 2008

AbstractThis article presents an ultra‐wideband antenna design useful for the internal application in compact mobile devices. It is a planar circular slot antenna fed by a 50‐Ω coplanar waveguide line through a circular patch. The antenna ground plane was bent and vertically connected to the system ground plane. Such fabrications make the whole ground plane like a step. The modified ground plane preserves the original ultrawide bandwidth (from 2.3 GHz to larger than 20 GHz) and radiation characteristics from the integration with the RF circuitry. Also, the experimental results indicate that the proposed antenna can be employed in very close proximity to the possible shielding metal cases for battery and associated RF circuitry, with almost no degradation in the antenna performances. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1487–1491, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23410
MZI‐SOA‐based 2R regeneration of OCDMA signals with multiaccess interference noise
Authors: Silveira T. , Teixeira A. , Kataoka N. , Ferreira A. , Wada N. , Wang X. , Miyazaki T. , Monteiro P. 
Published: March 2008

AbstractIn this work, we present 2R regeneration of coherent optical code division multiple access (OCDMA) signals with distortion provoked by multiple access interference. The regeneration scheme is based on a Mach‐Zehnder interferometer exploiting cross phase modulation in semiconductor optical amplifiers. Experimental regeneration of an 8 Chip 10 Gb/s OCDMA signal is demonstrated with improvements in the required optical signal‐to‐noise ratio and elimination of bit error rate floor. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1521–1523, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23412