bluuebunny/crossref_metadata_2025_split huggingface dataset:
A compact sharp‐rejection lowpass filter
Authors: Hung Cheng‐Yuan , Weng Min‐Hang , Yang Ru‐Yuan 
Published: February 2008

AbstractIn this article, a compact sharp‐rejection lowpass filter (SRLPF) is proposed and analyzed. By combining the coupled line section and shunt open‐circuited resonator, a compact lowpass filter with wide stopband and very high passband selectivity is realized. This filter at cutoff frequency fc of 2 GHz has presented very good measured characteristics, including very low insertion loss of 0.15 ± 0.05 dB, wide stopband from 3.2 to 8 GHz and attenuation slope of 51 dB/GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 894–896, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23224
Optical filters for fiber lasers and amplifiers
Authors: Rego G. 
Published: February 2008

AbstractWe discuss the writing of arc‐induced long‐period fiber gratings to be used as optical filters in Er/Yb fiber lasers and for flattening the gain spectra of Er‐doped fiber amplifiers. A new approach for the fabrication of filters with complex profiles is also presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 890–894, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23225
Cylindrical dipoles as ultra‐wide band antennas: An energy‐based analysis
Authors: Tamas Razvan D. , Babour Laurence , Fond Emilie , Slamnoiu Georgica , Chilo Jean , Saguet Pierre 
Published: February 2008

AbstractCylindrical antennas are well‐suited for military ultra‐wide band (UWB) applications. In this article, we evaluate energy‐based descriptors for three relevant types of cylindrical dipoles, including a novel stacked antenna. We show that the energy‐based analysis provide a more realistic view on the transient radiation than the classical frequency‐domain analysis. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 917–921, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23230
UWB antenna array for wireless transmission along corridors
Authors: Liu H.‐Z. , Coetzee J. C. , Mouthaan K. 
Published: February 2008

AbstractA 2‐element elliptical patch antenna array with a bidirectional radiation pattern has been developed for ultra wideband indoor wireless communications. The array is constructed by means of feeding two omni‐directional elliptical patch elements with a 3‐section hybrid power divider. Experimental results show that the array has a stable radiation pattern and low return loss over a broad bandwidth of 64% (3.1–6 GHz). © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 886–890, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23232
MMIC PAM applied with pre‐distorter having independent operation of nonlinear signal
Authors: Oh Inn‐Yeal , Kim Ki‐Byoung , Ra Keuk‐Hwan , Park Chul‐Soon 
Published: February 2008

AbstractA dynamic pre‐distorter with two paths to set nonlinear signal level and phase encourages power amplifier module (PAM) for wireless broadband (Wibro) service to enhance linearity. We proposed a linearizer having a new IM generator, which is made up of the InGaP/GaAs HBT operated at saturation region of a common collector circuit. The targeted Wibro PAM is designed using InGaP/GaAs HBT technology, and the pre‐distorter, drive and power amplifier are fully integrated in single chip within 960 × 2400 μm. Even though PAM is designed to have just a 5‐dB back‐off, PAM is compatible with linearity standards up to maximum output power 21 dBm, and has a 17.5% efficiency by having a low leakage and improving spurious of 6 dB in the 64QAM form based on IEEE802.16e‐2005 standards. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 851–855, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23235
An ultra‐wideband microstrip elliptical slot antenna excited by a circular patch
Authors: Lao Jia , Jin Ronghong , Geng Junping , Wu Qi 
Published: February 2008

AbstractA novel ultra‐wide band printed slot antenna is presented. By using the novel feeding structure of a circular patch with a tapered microstrip line, the bandwidth of the elliptical slot antenna is greatly enhanced. The impedance bandwidth (VSWR < 2) reaches 174%, covering 1.90–27.7 GHz with bandwidth ratio of 14.6:1. This novel structure also features a bidirectional radiation pattern and a thin profile, making it promising in various wideband applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 845–846, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23240
Coplanar waveguide wideband fractal Koch antenna
Authors: Jahanbakht M. , Lotfi Neyestanak A. A. , Naser‐Moghaddasi M. 
Published: February 2008

AbstractThe slot antenna is attractive for use in many applications. These antennas have several useful properties such as wider impedance bandwidth compared with the microstrip patch antennas, and easier integration with solid‐state, MIC, MMIC, and Micro Electro Mechanical Systems (MEMS). In this study, the novel wideband design of a coplanar waveguide fed fractal slot antenna is proposed and experimentally studied. The return loss, impedance matching and radiation pattern parameters of such a structure will be studied and in one case it would be measured. The obtained results show that the impedance bandwidth of the fractal slot antenna can be 52% which almost covers the entire S‐band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 936–939, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23241
Bode and Fano impedance matching
Authors: Hansen R. C. 
Published: February 2008

AbstractThe Bode limit on bandwidth enhancement through use of an ideal impedance matching network does not allow changes in antenna reflection coefficient over the bandwidth. An exact correction factor is derived from the Fano limitations, yielding a simple modification to the Bode limit. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 875–877, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23244
Diakoptic approach to analysis of multiconductor transmission lines
Authors: Olćan Dragan I. , Stevanović Ivica M. , Mosig Juan R. , Djordjević Antonije R. 
Published: February 2008

AbstractWe present a general method for numerical analysis of electrically large electromagnetic‐field problems, which is based on merging diakoptic approach and surface integral‐equation formulations. Compared with the classical approach, the proposed method provides significant reduction of c.p.u. time and storage, preserving high accuracy of results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 931–936, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23246
An experimental load matching technique for RF CMOS power amplifier
Authors: Eo YunSeong , Lee Seung‐Joon , Baek Dong‐Hyun 
Published: February 2008

AbstractA load matching method for CMOS PA (power amplifier) design is proposed. The contours for RF power and efficiency can be drawn while considering external L and C as tunable X and Y variables. On the basis of the existence of this contour, the realization of load matching of CMOS PA is easily achieved and optimized. A tested CMOS PA based on 0.18 μm CMOS technology shows a design example whose P1dB is 17.8 dBm and power efficiency 37%, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 899–902, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23248
A novel high performance microstrip diplexer for ultra‐wideband wireless communications
Authors: Hung Cheng‐Yuan , Weng Min‐Hang , Yang Ru‐Yuan 
Published: February 2008

AbstractA novel compact and high performance microstrip diplexer for ultra‐wideband communication is designed and implemented. This microstrip diplexer is simply composed of two coupled line structures and three tapped open stubs. The design concept has been verified by the experimental results of the fabricated diplexer, including the two isolated wideband bandwidths of 3–5 GHz and 6–10 GHz, low insertion loss and high isolation due to attenuation poles located between two channels. Experimental results also show a good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 921–923, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23252
Time and frequency observation of pulse amplitude equalization of harmonic mode‐locked fiber laser
Authors: Hu Li‐Chiang , Liu Nan‐Hsin , Yang Lan‐Chih , Lin Huang‐Chang , Tsao Shyh‐Lin 
Published: February 2008

AbstractIn this article, we achieve the output observation in time and frequency domain of a rational harmonic mode‐locked fiber laser (RHMLFL). The pulse amplitude of pulse train is equalized by operating at nonlinear modulation transfer function region of active modulator in RHMLFL. Without adding any other additional predistortion components, amplitude equalized short pulses up to the fourth order rational harmonic mode‐locking are successfully demonstrated for 7.5, 10, and 15 GHz. One can extend such a method for various mode‐locked lasers even with much higher repetition rates. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 957–961, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23256
Design of the compact SIR‐based bandpass filter with a wide stopband
Authors: Pan Heng‐Yau , Wu Hung‐Wei , Weng Min‐Hang 
Published: February 2008

AbstractCompact coupled stepped impedance resonators (SIRs) are used to design the bandpass filter (BPF) with a wide stopband. In the filter design, two different physical dimensions of the SIRs are used to produce proper required coupling for the frequency response with wide spurious suppression. The theory and guidelines for selecting the geometric parameters of SIRs are clearly presented in this paper. The BPF designed with center frequency (f0) at 2.45 GHz has a stopband extended up to 20 GHz (8.16f0) and an average rejection level better than 25 dB. Good agreement between the electromagnetic simulation and measurement is observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 948–952, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23261
Etched ring absorbing waveguide filter based on a slotted waveguide antenna response
Authors: Stander Tinus , Meyer Petrie 
Published: February 2008

AbstractA cascade of resistively loaded etched rings in waveguide is proposed to act as the load in a balanced FMCW reflected power canceller topology using a slotted waveguide array antenna. A synthesis technique using derived equivalent circuit models is presented and tested. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 977–981, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23262
A folded thin‐wire monopole antenna loaded by a rectangular dielectric resonator
Authors: Tsai Ching‐Long , Deng Sheng‐Ming , Chen Tsung‐Wen , Chang Yung ‐Cheng 
Published: February 2008

AbstractA rectangular ceramic dielectric resonator loaded into a folded thin‐wire monopole antenna in a horizontal finite ground plane is presented. While in a suitable adjustment, the impedance bandwidth of the proposed antenna is 67% (2.15–4.30 GHz). Moreover, the electric dipole pattern is kept in such antenna configuration. Additionally, antenna gain is about 2–4 dBi in the operating frequencies. The antenna configuration and performance is very suitable to apply in the wide‐band territorial communications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 939–942, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23268
Erratum: Design of a novel compact antenna for a bluetooth LTCC module
Authors: Seo Donghyun , Jeon Seunggil , Kang Namkee , Ryu Jong in , Choi Jae‐Hoon 
Published: February 2008

AbstractOriginally published Microwave Opt Technol Lett 50 (2008) 180–183. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1133, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23269DOI 10.1002/mop.23269
Dual‐band baluns for reducing the influence of feed cable in antenna measurement
Authors: Hsue Ching‐Wen , Lin Yi‐Chia , Chen Kuo‐Lung 
Published: February 2008

AbstractIn order to obtain accurate radiation characteristics of an antenna, it is required to reduce unbalanced current on the surface of the feeding cable. A miniaturized balun of stacked coaxial cavities is presented to show high input impedances at two separate bands. An equivalent circuit with transmission lines, and inductive and capacitive elements is employed to characterize the circuit behavior of the dual‐band balun. In particular, the method to design a dual‐band balun, with arbitrary ratio of the upper resonant frequency to the lower resonant frequency, is presented to facilitate the design process. Both numerical values and experimental results are presented to illustrate the validity of the design method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1000–1004, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23270
Design of the wideband dual‐mode bandpass filter using stepped impedance resonators
Authors: Hung Cheng‐Yuan , Weng Min‐Hang , Jhong Shih‐Bin , Wu Sean , Lee Maw‐Shung 
Published: February 2008

AbstractIn this letter, a novel dual‐mode bandpass filter (BPF) using stepped impedance resonators (SIRs) for simultaneous low insertion‐loss and wide passband has been designed. This novel wideband dual‐mode BPF is formed by a microstrip square ring resonator with direct‐connected orthogonal feed lines, and two impedance steps as perturbations. By varying the impedance ratio (K) of the SIRs, the wideband bandwidth can be tuned with more freedoms. The design procedure using the analysis of even and odd mode is described in this paper. The wideband BPF with relative bandwidth of 76.5% is simulated using the full wave electromagnetic simulation, and then fabricated and measured using the network analyzer. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1104–1107, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23281
The interrogation system for FBG sensing based on the InGaAs linear image sensor
Authors: Li Guoyu , Zhang Hao , Liu Bo , Zhang Jian , Yuan ShuZhong , Kai Guiyun , Dong Xiaoyi 
Published: February 2008

AbstractThis article presents an interrogation system based on the InGaAs linear image sensor. By applying SDM and WDM techniques, the interrogation system based on the InGaAs linear image sensor is designed and the system performance is analyzed. Experimental results show that the interrogation system can be used to interrogate the FBG sensors with wavelength bandwidth of 42 nm, SNR of 43 dB, wavelength accuracy of ±10 pm, and wavelength stability of ±15 pm. The system shows a good prospect for smart sensing. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1101–1104, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23282
Design and analysis of high‐power InP‐based heterostructure barrier varactor multipliers
Authors: Emadi Tahereh Arezoo 
Published: February 2008

AbstractThe heterostructure barrier varactor design method aims at finding optimum epitaxial layer structure and device geometry to improve the diode power handling capability. The nonlinear thermal resistance of the HBV and an empirical expression introducing the leakage current are proposed and added to the electro‐thermal HBV model. Finally, the HBV model is used to simulate various devices. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1017–1022, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23293
New basis functions for the electromagnetic solution of arbitrarily‐shaped, three dimensional conducting bodies using method of moments
Authors: Mackenzie Anne I. , Baginski Michael E. , Rao Sadasiva M. 
Published: February 2008

AbstractIn this work, we present a new set of basis functions, defined over a pair of planar triangular patches, for the solution of electromagnetic scattering and radiation problems associated with arbitrarily‐shaped surfaces using the method of moments solution procedure. The basis functions are constant over the function subdomain and resemble pulse functions for one and two dimensional problems. Further, another set of basis functions, point‐wise orthogonal to the first set, is also defined over the same function space. The primary objective of developing these basis functions is to utilize them for the electromagnetic solution involving conducting, dielectric, and composite bodies. However, in the present work, only the conducting body solution is presented and compared with other data. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1121–1124, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23295
Sparse factorization of finite element matrices using overlapped localizing solution modes
Authors: Choi J.‐S. , Adams R. J. , Canning F. X. 
Published: February 2008

AbstractLocal‐global solution (LOGOS) modes provide a computationally efficient framework for developing fast, direct solution methods for electromagnetic simulations. In this article, we demonstrate that the LOGOS framework yields fast direct solutions for finite element discretizations of the wave equation in two dimensions. For fixed‐frequency applications, numerical examples demonstrate that the memory and CPU complexities of the proposed solver are nearly linear. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1050–1054, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23298
The resonant behavior of the Fibonacci fractal tree antennas
Authors: Ozbakis Basak , Kustepeli Alp 
Published: February 2008

AbstractAn investigation of a novel fractal tree antenna with the application to two different geometries is presented. The antenna is designed by using the special Fibonacci number sequence which leads to nonuniform branch length ratios to form the fractal tree. This new approach gives better performance, especially in the miniaturization of the antenna, when compared with the conventional designs. The results obtained from the experiments are also compared with the computed ones and there is a very good agreement between the numerical and measured data. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1046–1050, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23299
A compact multi‐band meanderline antenna for wireless communications applications
Authors: Eldek Abdelnasser A. 
Published: February 2008

AbstractThis study presents a compact, multi‐band, and single‐feed microstrip antenna for wireless communications applications. The proposed antenna consists of microstrip feedline, two step power coupler, rectangular loop, and meander line. The meander line is shorted in specific positions with the loop. All these components together provide multi‐paths for the current resulting in providing multiple resonances. The meander line is used to lengthen the electrical paths while maintaining a compact size. The simulation and measurements of this design will be presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1117–1121, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23303
Broadband VCO using electronically controlled metamaterial transmission line based on varactor‐loaded split‐ring resonator
Authors: Choi Jaewon , Seo Chulhun 
Published: February 2008

AbstractIn this article, the broadband voltage‐controlled oscillator (VCO) using electronically controlled metamaterial transmission line based on varactor‐loaded split‐ring resonator (VLSRR) is presented. It is demonstrated that VLSRR coupled to microstrip line can lead to metamaterial transmission line with tuning capability. The negative effective permeability is realized by the VLSRR in a narrow band above the resonant frequency. The bias of VLSRR is controlled by the varactor diodes. The phase noise of VCO is −108.84 to −106.84 dBc/Hz at 100 kHz in the tuning range, 5.407–5.84 GHz. The figure of merit (FOM) called power‐frequency‐tuning‐normalized (PFTN) is 20.144 dB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1078–1082, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23305
Wideband circular polarization patch antenna for access point of 802.11B, G WLAN
Authors: Park Su Bin , Kim Sung Min , Yang Woon Geun 
Published: February 2008

AbstractA wideband patch antenna using circular polarization was designed and implemented. To enhance the operation bandwidth of the proposed antenna, probe feeding and air gap (capacitive gap) were used. The air gap was composed of a rectangular shape near the feed point. The impedance bandwidth (VSWR < 2) was 29.01% ranging from 2.163 to 2.897 GHz and the axial ratio bandwidth (AR < 3 dB) was 5.48% ranging from 2.394 to 2.529 GHz. Measured maximum gain was approximately 6.92 dBic at 2.480 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1042–1046, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23307
Long‐range 1H1H NMR correlation: extending connectivities to remote bonds via an intermediate heterospin
Authors: Parella Teodor , Espinosa Juan Félix 
Published: February 2008

AbstractAn out‐and‐stay 2D proton–proton NMR correlation experiment is proposed to detect long‐range proton–proton connectivities up to six and seven bonds away. The magnetization flow pathway is based on a consecutive, dual‐step J(CH)transfer mechanism and it allows one to trace out 1H1H connectivities between protons belonging to different spin systems. This novel experimental scheme will be particularly useful in cases when carbon resonances overlap, providing connectivity information that could not be obtained in a HMBC experiment. The success of the experiment is demonstrated in the structural studies of a wide variety of chemical compounds. Copyright © 2008 John Wiley & Sons, Ltd.