bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parallel ANI‐FDTD implementation for electromagnetic scattering by both electric and magnetic anisotropic medium
Authors: Yang L. X. , Wang G. , Yan S. 
Published: March 2008

AbstractA three‐dimensional anisotropic medium FDTD (ANI‐FDTD) of dyadic constitutive parameters ε, μ, σ, and σm is discussed. A 28 field component grid model is given showing the relation of computation grid of a field component in ANI‐FDTD with its neighboring grids. Based on this model, an FDTD parallel computing algorithm for lossy anisotropic medium is proposed. Some numerical results are given to exemplify the feasibility of presented algorithm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1165–1168, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23318
Low‐power fully‐differential 3.5‐GHz wideband CMOS LNA
Authors: Wei M. D. , Chang S. F. 
Published: March 2008

AbstractThis article presents a low‐power fully‐differential 3.5‐GHz wideband complementary metal oxide semiconductor (CMOS) low‐noise amplifier (LNA) based on the LC‐ladder match network approach. To have low power consumption and high power gain, two common‐source stages are cascaded for reusing the bias current. To have wideband low noise figure, the gate width of the input transistor is determined from the wideband optimization of noise contribution. The implemented 0.18‐μm CMOS differential LNA achieves a power gain of 12 dB, a minimum noise figure of 3.0 dB, an input‐referred third‐order intercept point of −3.2 dBm, and a 3‐dB bandwidth of 2.5–4.5 GHz, while consuming 12.9 mW. Compared with the other wideband differential LNAs tailored for the same frequency range, a very high figure‐of‐merit of 0.36 is achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1196–1198, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23321
Optical mm‐wave DWDM signal generation with photonic frequency quadruple by only one external modulator
Authors: Li Ying , Chen Lin , Wen Shuangchun , Fan Dianyuan 
Published: March 2008

AbstractWe have proposed a novel scheme to generate optical mm‐wave DWDM signals with four time frequency of the local oscillator by using only one external modulator. By incorporating the proper direct current (DC) bias on the external modulator to suppress the first order sideband in central office (CO), and using optical filtering technique to separate the optical mm‐wave and optical carrier in the base station, the dense wavelength division multiplexing (DWDM) optical millimeter‐wave (mm‐wave) signals are generated with four times frequency of the LO signal. We have experimentally demonstrated four‐channel DWDM optical mm‐wave signal generation with a repetitive frequency up to 40 GHz by 10 GHz LO, and down‐stream signal delivery over 20‐km fiber with 0.7‐dB power penalty. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1152–1155, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23328
A K‐band low‐noise amplifier using shunt RC‐feedback and series inductive‐peaking techniques
Authors: Chen Chi‐Chen , Lin Yo‐Sheng , Chang Jin‐Fa , Lee Jen‐How 
Published: March 2008

AbstractA 28.2 GHz (K‐band) low‐noise amplifier (LNA) using standard 0.18‐μm CMOS technology was designed and implemented. To achieve sufficient gain, this LNA was composed of three cascaded common‐source stages, and a peaking inductor (Lg3) was added in the input terminal of the third stage to boost the peak gain (S21) of 34.9% (simulation). Shunt RC feedback was adopted in the second and the third stage, respectively, for achieving good input and output impedance matching. At 28.2 GHz, this LNA achieved input return loss (S11) of −13.4 dB, output return loss (S22) of −20.5 dB, forward gain (S21) of 12.9 dB, reverse isolation (S12) of −50.2 dB, noise figure of 6.07 dB and input‐referred 1‐dB compression point (P1dB‐in) of −10.8 dBm. The minimum noise figure was 5.75 dB at 28.8 GHz. The chip area was only 950 μm × 590 μm excluding the test pads. The power consumption was 30.56 mW from a 1.8‐V power supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1148–1152, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23332
A high‐performance wideband cmos low‐noise amplifier using inductive series and parallel peaking techniques
Authors: Lee Jen‐How , Chen Chi‐Chen , Lin Yo‐Sheng 
Published: March 2008

AbstractA 1–11 GHz wideband low‐noise amplifier (LNA) with good phase linearity properties (group‐delay variation is only ±35.56 ps across the 3.1–10.6 GHz band of interest) using standard 0.18 μm CMOS technology is reported. To enhance the bandwidth for achieving both high and flat gain and small group‐delay variation, the inductive shunt‐peaking technique is adopted in the load of the input stage, while the inductive series‐peaking technique is adopted in the input terminal of the output stage. The wideband LNA dissipates 29.46 mW power and achieves input return loss (S11) of −9.32 to −9.98 dB, flat forward gain (S21) of 11 ± 1 dB, reverse isolation (S12) of −46 to −60 dB, and noise figure of 4.15–4.85 dB over the 3.1–10.6 GHz band of interest. Good 1‐dB compression point (P1 dB) of −14 dBm and input third‐order inter‐modulation point (IIP3) of −3 dBm are achieved at 6.4 GHz. The chip area is only 675 μm × 632 μm excluding the test pads. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1240–1244, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23338
Miniaturized microstrip cross‐coupled bandpass filter using novel stepped impedance resonators with a desirable upper stopband
Authors: Zhao Guohua , Liu Changjun 
Published: March 2008

AbstractA miniaturized microstrip cross‐coupling bandpass filter using new stepped impedance resonators (SIRs) with simultaneous suppression of the 2nd harmonic passband response is presented. Four improved and miniaturized SIRs constitute the compact filter, which exhibits a sharp transition band due to two transmission zeros at both sides of the passband. Two quarter‐wavelength open‐ended stub resonators are applied to provide extra transmission zeros for suppressing the 2nd harmonic passband. A bandpass filter with a center frequency at 2.5 GHz was designed and fabricated, of which experimental results validated the proposed filter design. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1270–1273, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23343
Analysis of frequency division in microstrip circuits by using the FDTD method
Authors: González Oscar , Pereda José A. , Suárez Almudena , Grande Ana , Vegas Ángel 
Published: March 2008

AbstractThe accurate time‐domain simulation of the nonlinear dynamics of circuits containing distributed elements is of great interest. Specially at high frequencies, it is essential to consider phenomena, such as crosstalk, packaging effects, and electromagnetic interaction between active and passive elements. These effects are mainly due to the distribute components of the circuit. Therefore, the accuracy in the instability or oscillation analysis of nonlinear circuits is often limited by the models used for such elements. Commercial simulators based on the equivalent‐circuit approach hardly take into account the mentioned effects. In this work, the finite‐difference time‐domain (FDTD) method is applied to the nonlinear simulation of a diode‐based microstrip circuit exhibiting a parametric frequency division by two. The FDTD method rigorously solves Maxwell's curl equations in the time domain providing a full‐wave characterization of the distributed elements of the circuit. In the example considered, a relatively low operating frequency has been selected to allow a reliable comparison between the results obtained by the proposed technique and those provided by a circuit‐based commercial simulator. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1300–1302, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23352
New compact microstrip stacked slotted resonators bandpass filter with transmission zeros using high‐permittivity ceramics substrate
Authors: Huang Cheng‐Liang , Chen Yuan‐Bin , Tasi Chia‐Feng 
Published: March 2008

AbstractThe miniaturization of hairpin band‐pass filters by employing two high‐permittivity ceramic substrates (with respective dielectric constants of 9.7 and 26.1) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. With the advantages of compact size, high‐permittivity ceramics can be used as the substrate for band‐pass filters. Moreover, the fundamental characteristics of newly developed slotted resonators. In this article, the designed vertically stacked slotted resonators structures are simulated using an IE3D simulator. The responses of the fabricated filters using Al2O3 (εr = 9.7, Q × f = 350,000 GHz) and 0.8(Mg0.95Zn0.05)TiO3‐0.2Ca0.61Nd0.26TiO3 (εr = 26.1, Q × f = 46,000 GHz) ceramic substrates are designed at a center frequency of 2.45 GHz. This vertically stacked slotted resonators and sharp cutoff frequency response band‐pass filter should be useful in many wireless communication systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1377–1379, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23366
Erratum: A compact ultrawideband slot antenna with multiple frequency bands
Authors: Ding Jiechen , Lin Zhili , Ying Zhinong , He Sailing 
Published: March 2008

Abstract© 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1446, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23370
Dual‐band omni‐directional antenna for WLAN application
Authors: Wu Y.‐J. , Fan J.‐W. , Sun B.‐H. 
Published: March 2008

AbstractA dual‐band omni‐directional antenna that comprises two pairs of dipoles placed back‐to‐back and printed on a dielectric substrate is presented. A prototype is constructed and tested. The experimental results show that the 10‐dB return loss bandwidths (VSWR < 2.0) reach as much as 120 MHz at the lower band and 1750 MHz at the upper band. Moreover, the radiation patterns are almost omni‐directional in the azimuthal plane. Peak antenna gain is 1.45, 3.89, and 4.36 dBi at 2.4, 5.2, and 5.8 GHz, which indicates that the proposed antenna can be used as a dual‐band antenna for the wireless local area networks (WLAN) application. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1328–1330, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23376
A clonal selection algorithm with varying order finite elements for the optimization of microwave devices
Authors: Paul Prakash , Guimarães Frederico G. , Nair D. , Lowther David A. 
Published: March 2008

AbstractA real‐coded clonal selection algorithm (RCSA), which is a global search method based on the artificial immune systems paradigm, is applied for optimizing microwave devices. We couple RCSA with varying high‐order finite elements (FEs) to control the balance between the global and local search efforts in the algorithm. In this scheme, low‐order FEs are used in the global search, whereas varying high‐order FEs are used in the local search. The proposed technique is investigated in the designs of an E‐plane miter bend and a rectangular waveguide impedance transformer. The results illustrate the accuracy and computational savings of this method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1392–1397, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23387
Implementation of connection boundary for HIE‐FDTD method
Authors: Chen Juan , Wang Jianguo 
Published: March 2008

AbstractThe implementation of connection boundary for the hybrid implicit‐explicit finite‐difference time‐domain (HIE‐FDTD) method is discussed in this article. It shows that the incident field of the HIE‐FDTD method must be split into two time steps. Compared with the implementation method commonly used in the conventional FDTD scheme, this method is weakly conditionally stable and has higher accuracy. The theory proposed in this article is validated through numerical examples. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1347–1352, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23390
A novel dual‐band bandpass filter using stepped impedance resonators with transmission zeros
Authors: Chu Qing‐Xin , Chen Fu‐Chang 
Published: March 2008

AbstractA novel dual‐band bandpass filter using stepped impedance resonator is proposed in this letter. New coupling structures are illustrated to replace the normal counterparts, the circuit size is reduced about 40% compared with the conventional BPF with the same specifications, while the new structure can generate two transmission zeros in the insertion loss response, to validate the design and analysis, two dual‐band bandpass filters centered at 2.4 GHz/5.2 GHz and 2.4 GHz/5.7 GHz for WLAN application were fabricated and measured, it is shown that the measured and simulated performance are in good agreement. The bandpass filters achieved insertion loss of less than 2 dB and return loss of greater than 16 dB in each band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1466–1468, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23394
A high efficiency 40‐W Ku‐band spatially power combined solid‐state amplifier
Authors: Dang Zhang , Zou Yongquan , Zhang Yuxing , Deng Li 
Published: March 2008

AbstractThis article presents a compact, high‐efficiency, spatially power‐combining system based on WR‐140 waveguide power dividers/combiners and microstrip probe transitions. Using four GaAs MMIC driver amplifiers and four MFET power amplifiers, the combining circuit produced up to 45‐W maximum power output with a gain variation of ±1 dB within the band of 13.8–14.8 GHz. The passive combining efficiency within the operating band was measured over 87%, and PAE was up to 22%. An effective design and tuning method was adopted, and so a high combining efficiency was achieved. The results suggest the efficacy of the design and a strong potential for higher powers by connecting waveguide power dividers/combiners to these combining modules. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1471–1476, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23404
Characterization of a first‐resonance CPW‐fed slot as an array element
Authors: Joubert J. , Odendaal J. W. 
Published: March 2008

AbstractThe self‐impedance and radiation properties of a first‐resonance CPW‐fed slot are characterized for possible use as an array element. It is shown that an interdigital capacitor in the center feed line of the CPW allows excellent control over the resonant resistance of the slot, and allows one to realize a wide range of impedances. Simulations are validated by measured results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1523–1527, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23411
Design of a triple‐band coplanar‐waveguide bandpass filter
Authors: Ye Chang‐Sin , Su Yan‐Kuin , Weng Min‐Hang , Huang Chun‐Yueh 
Published: March 2008

AbstractA novel compact and high‐isolation triple‐band coplanar‐waveguide bandpass filter designed at 1.30, 2.03, and 2.74 GHz is presented. More than one transmission zero between the three passbands is realized to improve the selectivity of the filter and to achieve a high isolation higher than 30 dB. Good agreements between the simulated and measured results demonstrate our proposed structure. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1545–1547, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23417
Dual‐band bandpass filter by using square‐loop dual‐mode resonator
Authors: Balalem Atallah , Machac Jan , Omar Abbas 
Published: March 2008

AbstractThis paper presents a dual‐band bandpass filter by introducing transmission zeroes in the passband of a broadband bandpass filter using square‐loop dual‐mode resonators. The transmission zeroes are achieved by using a dual‐mode resonator. The dual‐mode resonator is attached to two transmission lines of same length. These lines are coupled to similar transmission lines that are attached to the I/O ports. The filter has a compact size, low losses, and good rejection between the two bands. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1567–1570, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23427
A novel method of detecting cervical cancer using microwaves
Authors: Lonappan Anil , Thimothy V. O. , Rajasekaran C. , Thomas Vinu , Jacob Joe , Mathew K. T. 
Published: March 2008

AbstractThis article communicates a new method of detecting cervical cancer based on the measurement of the dielectric properties of smear at microwave frequencies. The microwave measurements were performed by rectangular cavity perturbation in the S‐band of microwave frequency with the smear samples from healthy persons as well as from cancerous patients. It is observed an appreciable change in the dielectric properties of cancerous samples with the normal healthy samples and these measurements were in good agreement with clinical analysis. This measurement technique is simple and the collection of smear is painless and nonsurgical in nature. The results show a new method of diagnosing cervical cancer using microwave measurement without any surgical procedures and suggest an alternative to Papanikolaou test or Papanicolaou test. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1552–1554, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23433
Discrete‐time notch filter and its application to microwave filter
Authors: Hsue Ching‐Wen , Ling Chih‐Wei , Hung Wan‐Ting 
Published: March 2008

AbstractA discrete‐time, second‐order notch filter is employed to study the microwave bandstop filter. By equating the system function of the second‐order notch filter to the transfer function of a serial line shunted with an equal‐length, two‐section open stub, simple and explicit expressions dictating the bandwidth and center frequency of a microwave bandstop filter are obtained. Experimental results are presented to illustrate the validity of this design method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1596–1600, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23439
Channel pre‐emphasis equalization for a 270 km 40 × 40 GBIT/S WDM system
Authors: Yang Aiying , Qiao Yaojun , Sun Yu‐Nan 
Published: March 2008

AbstractOptical channel pre‐emphasis equalization is experimentally researched for a 270 km 40 × 40 Gbit/s WDM transmission system with three EDFAs concatenated as booster amplifier. The channel imbalance of the overall system changes with different sets of power launched into EDFAs. Appropriately choosing the power input to concatenated EDFAs can make the output spectrum of 40‐channel signal be equalized to the most extent. The merit of benefit can be around 5.5 dB by this pre‐emphasis equalization. The requirement for the gain equalizer is therefore greatly released although still necessary. To take the channel imbalance of transmitter signal into account, the gain imbalance of the overall system almost matches the power imbalance of 40 channels, but the significant difference lies at some channels. Finally, the pump power into Raman amplifier is also optimized, and another 1.3‐dB improvement of channel balance can be further achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1632–1634, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23450
Design and implementation of microwave dual‐band bandpass filters using microstrip composite resonators
Authors: Ma Zhewang , Shimizu Taichi , Kobayashi Yoshio , Anada Tetsuo , Hagiwara Gen 
Published: March 2008

AbstractIn this article, a novel type of dual‐band bandpass filter (DBBPF) is proposed by using microstrip composite resonators, and its design method is developed based on the lumped‐element equivalent circuit of the filter. Both the midband frequencies and the passband widths of the dual bands of the filter can be controlled separately. Four DBBPFs with different specifications are designed, fabricated, and tested, and the measured frequency responses agree favorably with theoretical predictions, validating sufficiently the proposed design theory and filter structures. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1628–1632, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23451
Resonant frequency calculation of meander dipole antennas by TLM
Authors: Puente David , Valderas Daniel , García Joseba , Meléndez Juan , Gómez Javier , Sancho Juan Ignacio 
Published: March 2008

AbstractA new method for calculating the resonance frequency of an arbitrary meander dipole antenna (MDA) is proposed by making use of a full transmission line model approach. Once the current distribution of MDA is analyzed, a theoretical formula is obtained for input voltage and resonance frequency calculation. The model is compared with simulations and prototype measurements on three MDA families: those which exhibit an increasing number of meanders, variable meander sizes, and locations within MDA, respectively. The error is below 7.8% in all cases. Conclusions are drawn on optimal meanders for miniaturization. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1707–1712, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23463
Wideband monopole antenna with WLAN (2.4 GHz/5 GHz) dual band‐stop function
Authors: Lee Heejun , Jang Yohan , Kim Jeongpyo , Choi Jaehoon 
Published: March 2008

AbstractA wideband monopole antenna with dual band‐stop function for WLAN (2.4 GHz/5 GHz) is presented. By cutting away an arched slot from the radiation patch and inserting spur‐lines into the ground, dual band‐stop functions for 2.4 GHz and 5 GHz WLAN bands are obtained. The proposed antenna operates over 1.9–11 GHz for VSWR <2, while providing a band‐stop function in the frequency bands of 2.2–2.5 GHz and 5.15–6.1 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1646–1649, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23570