bluuebunny/crossref_metadata_2025_split huggingface dataset:
Novel compact narrowband CPW bandpass filter using an efficient loaded structure
Authors: Liao Shry‐Sann , Chen Hsien‐Ku , Liao Hsien‐Yuan , Chang Yin‐Cheng 
Published: June 2004

AbstractA novel compact narrowband bandpass filter (BPF) using coplanar waveguide (CPW) with an efficient slow‐wave structure is presented. The folded open stub is used as loaded structure for the filter design with the merit of better slow‐wave factor. Additionally, this filter achieves a sharp transition band (TB) and 5% bandwidth at 2.4 GHz with 60.67% reduced factor. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 185–187, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20246
Mutual impedance between two dipole antennas fed by single source
Authors: Amin M. , Cahill R. 
Published: June 2004

AbstractWe present a new circuit‐model approach which can be used to compute the mutual impedance between two dipoles fed at the same feed point. The validity of the method is confirmed by comparison with mutual impedance values obtained when the dipoles are individually excited and orientated at angles between 0° and 90°. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 187–189, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20247
Inverted L‐shaped and parasitically coupled inverted L‐shaped microstrip patch antennas for wide bandwidth
Authors: Neog D. K. , Pattnaik S. S. , Dutta M. , Devi S. , Khuntia B. , Panda D. C. 
Published: June 2004

AbstractCoax‐fed inverted L‐shaped microstrip antennas and parasitically coupled inverted L‐microstrip antennas are presented. The inverted L‐shaped microstrip antenna gives an impedance bandwidth of 30.6%, which is increased to 33.7% by parasitic coupling. The bandwidth has been achieved with a substrate thickness of 2 mm. Radiation patterns and gains are also studied and presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 190–192, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20248
32‐channel arrayed‐waveguide‐grating multiplexer using fluorinated polymers with high thermal stability
Authors: Wang Fei , Ma Chunsheng , Sun Wei , Li Aize , Zhao Yu , Zhang Haiming , Jiang Zhenhua , Zhang Daming 
Published: June 2004

AbstractA 32‐channel arrayed‐waveguide‐grating (AWG) multiplexer operating around 1550 nm has been designed and fabricated using synthesized cross‐linkable fluorinated poly (ether ether ketone). The channel spacing is 0.8 nm (100 GHz). The insertion loss of the multiplexer is 12–17 dB and the cross talk is less than −20 dB. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 192–196, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20249
Numerical design for efficiently coupling conventional and photonic‐crystal waveguides
Authors: Chietera G. , Bouk A. H. , Poletti F. , Poli F. , Selleri S. , Cucinotta A. 
Published: June 2004

AbstractDifferent tapered‐waveguide junctions are investigated for coupling light between traditional dielectric and photonic‐crystal waveguides characterized by a triangular lattice of air holes. Efficient approaches for the taper design, which allow flat‐transmission efficiency higher than 85% in the whole spectrum of the third telecommunication window, are proposed. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 196–199, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20250
10‐GB/S transmission over 1400 km on G.652 fiber with dispersion compensation by chirped FBG
Authors: Tan Zhongwei , Jian Shuisheng , Liu Yan , Ning Tigang 
Published: June 2004

AbstractWe successfully transmit a signal as long as 1400 km with G.652 fiber using chirped fiber gratings. Asymmetrical apodization is adopted to reduce the grating's group‐delay ripple (GDR). Power and dispersion management are used to suppress nonlinear effects. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 199–201, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20251
A focused‐beam methodology for measuring microwave backscatter
Authors: Schultz John W. , Hopkins Edward J. , Maloney James G. , Kuster Eric J. , Kesler Morris P. 
Published: June 2004

AbstractA methodology is developed to determine the microwave backscatter from inhomogeneous materials and structures using a free‐space focused‐beam apparatus. This quantitative method determines the scattering coefficient for inhomogeneous surfaces and echo width for linear discontinuities. Measured data from a random rough surface are compared to compact radar cross‐section (RCS) range measurements, scatter data from a periodic array are compared to numerical simulations, and edge‐diffraction measurements are compared to model calculations. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 201–205, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20252
Experimental investigation of novel multifingered antenna
Authors: Ooi B. L. , Leong M. S. , Yu K. Y. , Wang Y. , Chen B. 
Published: June 2004

AbstractA novel tri‐band, multifingered antenna is proposed. With the integration of the electromagnetic bandgap as an impedance‐matching element, a wider impedance bandwidth response is obtained. The proposed antenna is also noted to be smaller in size, as compared to the conventional microstripfed tri‐band antenna. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 206–208, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20253
Characterization of benzocyclobutene optical waveguides fabricated by electron‐beam direct writing
Authors: Hsu Chih‐Wei , Chen Hsuen‐Li , Chao Wen‐Chi , Wang Way‐Seen 
Published: June 2004

AbstractOptical waveguides based on benzocyclobutene polymer are fabricated by electron‐beam direct writing without etching. The propagation losses of waveguide measured at 1.55 μm for both TE and TM polarizations are 0.76 and 0.86 dB/cm, respectively. Moreover, the characteristics of waveguide bends are discussed for comparison. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 208–210, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20254
W‐band transmitter module using gallium arsenide mmics
Authors: Archer John W. , Shen Mei Gan 
Published: June 2004

AbstractThis paper describes a high‐gain, single‐sideband, upconverting transmitter module developed for point‐to‐point telecommunications in the 83–87‐GHz band. Four gallium arsenide (GaAs) monolithic microwave integrated circuits (MMICs), which can readily be fabricated using standard commercial processes, are used in the multichip module. The transmitter exhibits a typical lower‐sideband up‐conversion gain of 20 dB and a typical output power of +5 dBm (at −1‐dB gain compression) between 83 and 87 GHz. Suppression of the higher sideband is greater than −15 dB. The two‐tone, 3rd‐order intercept point is typically +15 dBm for a tone spacing of 100 MHz at the lower sideband IF input. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 210–213, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20255
Integral‐equation‐based analysis of transient scattering from surfaces with an impedance boundary condition
Authors: Chen Qin , Lu Mingyu , Michielssen Eric 
Published: June 2004

AbstractA marching‐on‐in‐time (MOT)‐based scheme for the analysis of transient scattering from closed surfaces characterized by an impedance boundary condition (IBC) is described. The time‐domain integral equations being solved involve no analytical approximation and are free of spurious solutions. The proposed scheme is validated by a host of numerical examples. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 213–220, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20256
An LTCC planar ultra‐wideband antenna
Authors: Ying Chen , Li G. Y. , Zhang Y. P. 
Published: June 2004

AbstractAn ultra‐wideband (UWB) planar volcano‐smoke slot antenna realized using low‐temperature cofired ceramic (LTCC) technology is reported in this paper. The antenna, developed for a single‐package solution of UWB radio, hasimple single‐layer structure and a small footprint of 23 × 23 mm2. The result shows that the prototype antenna achieves an impedance bandwidth of 9 GHz (with return lossS11< −10 dB from 3 to 12 GHz). The antenna radiation pattern at frequencies 3.5, 6.85, and 10.1 GHz and gain versus frequency are also presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 220–222, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20257
Wideband bow‐tie antenna with coplanar stripline feed
Authors: Bindu G. , Hamsakkutty V. , Lonappan Anil , Jacob Joe , Thomas Vinu , Aanandan C. K. , Mathew K. T. 
Published: June 2004

AbstractThe experimental investigation on a coplanar stripline‐fed bow‐tie antenna backed by an image plane is presented. Analysis of the radiation characteristics shows that the antenna exhibits an enhanced 2:1 SWR bandwidth of 46%, low cross polarization, and reduced back radiation. This antenna has applications in confocal microwave imaging and impulse ground‐penetrating radar. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 222–224, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20258
Mutual coupling between planar inverted‐F antennas
Authors: Carrasco H. , Hristov H. D. , Feick R. , Cofré D. 
Published: June 2004

AbstractMutual coupling between two planar inverted‐F antennas (PIFAs) based on a ground plane is studied numerically and experimentally. Several arrangements of collinear, orthogonal, and parallel PIFA elements with interelement spacing ranging from 0.1λ to 0.9λ are examined at the design frequency of 2.45 GHz, and in the 2.0–3.0‐GHz frequency band. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 224–227, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20259
Encryption‐selectable holographic storage in LiNbO3 with angle multiplexing
Authors: Su Wei‐Chia , Sun Ching‐Cherng , Su Wei‐Chen 
Published: June 2004

AbstractAn encryption‐selectable holographic storage algorithm in LiNbO3 using angular multiplexing is proposed and demonstrated. It offers more flexibility to encrypt or not encrypt the data (optionally) during the recording processes. The functions encryption and nonencryption storage are alternately handled by a random‐phase pattern and a uniform‐phase pattern. The random phase pattern is also used to decrypt the encrypted information. The experimental results obtained using a ground glass to realize the proposed method are presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 227–230, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20260
Multiband miniaturized PIFA for compact wireless‐communication applications
Authors: Elsadek Hala , Nashaat Dalia , Ghali Hani 
Published: June 2004

AbstractThe definitive element of any wireless device is its antenna. In this paper, a multiband planar inverted‐F antenna (PIFA) is miniaturized. The results show that a 68%–82% size reduction can be achieved. Two techniques for reduction are utilized: (i) adding lumped load and (ii) miniaturizing the geometry by using the fractal concept. New PIFA configurations are reached. Quad‐band operation is achieved. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 230–234, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20261
Color face‐image recognition with liquid‐crystal spatial light modulators
Authors: Chen Chihung , Chen Chulung , Lee Chung‐Cheng , Chen Chiwen 
Published: June 2004

AbstractIn this paper, for color face‐image recognition, we adopt a system based on the nonzero‐order joint‐transform correlator and use the method of Lagrange multipliers to design the reference functions. Some different facial expressions are utilized as test images to study the discrimination capability. Additionally, random noise is added to the test images in order to investigate the effectiveness of the proposed technique. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 234–237, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20262
Effects of time‐division multiplexing of two‐pump wavelengths on a counter‐pumped Raman‐fiber amplifier
Authors: Mahdi Mohd Adzir , Sheih Shou‐Jong 
Published: June 2004

AbstractWe demonstrate the impacts of the time‐division multiplexing (TDM) technique on a two‐pump wavelength Raman‐fiber amplifier. Modulation frequency is critical in this pumping technique, which can create temporal gain variations at low frequencies. The effective noise figure also degrades when utilizing this pumping scheme due to the arising of amplified spontaneous emission. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 238–239, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20263
Analysis of negative‐resistance characteristics in active capacitance circuit
Authors: Chun Young‐Hoon , Lee Jae‐Ryong , Yun Sang‐Won , Rhee Jin‐Koo 
Published: June 2004

AbstractAn active‐capacitance circuit with a series‐feedback network is analyzed in depth and its application to an active microwave band‐pass filter (BPF) is discussed. In this paper, we extract the exact equivalent values of this circuit and analyze the RF characteristics while varying the values of active devices and feedback circuits. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 240–243, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20264
Broadband low‐profile printed T‐shaped monopole antenna for 5‐GHz wlan operation
Authors: Su Saou‐Wen , Wong Kin‐Lu , Chen Hong‐Twu 
Published: June 2004

AbstractA broadband low‐profile printed T‐shaped monopole antenna is presented. It is demonstrated that, by short‐circuiting the central arm of a low‐profile T‐shaped monopole to the ground plane, much improved impedance matching over a wide frequency range can be achieved. A constructed prototype showing a low profile of only 3 mm and a wide bandwidth larger than 1.1 GHz covering the 5.2/5.8‐GHz WLAN bands is presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 243–245, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20265
Simultaneous WDM channel wavelength monitoring using a temperature‐modulated AWG
Authors: Kim Sang‐Yuep , Namgung Seong‐Won , Lee Jae‐Seung 
Published: June 2004

AbstractWe propose a method to monitor the center wavelengths of wavelength‐division multiplexed optical channels simultaneously using a temperature‐modulated arrayed waveguide grating (AWG). With this method, we can reduce the cost by using standard AWGs. Also, monitoring errors can be greatly suppressed in the presence of amplified‐spontaneous‐emission noises. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 245–249, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20266
Dual‐band printed dipole antenna array for an emergency rescue system based on cellular‐phone localization
Authors: Villemaud G. , Decroze C. , Dall'omo C. , Monediere T. , Jecko B. 
Published: June 2004

AbstractThis paper describes the study of a novel dual‐band antenna dedicated to be mounted on a helicopter for emergency localisation of cellular phones within the framework of the RNRT project called LUTECE. A folded dipole placed on a limited ground plane to allow wideband functionality and good radiation characteristics is proposed. Starting from this new topology, a directive array for the emission part and a circular disposition of five radiating elements with separated outputs for the receiving part are studied. All these developments are performed using our simulation code (FDTD method) along with experimental studies. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 249–253, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20267
A novel interleaver based on dual‐pass Mach‐Zehnder interferometer
Authors: Zhang Ting , Chen Kai , Sheng Qiuqin 
Published: June 2004

AbstractA novel interleaver based on a dual‐pass Mach–Zehnder (M–Z) interferometer is proposed and analyzed by both theory and experiment. Compared with the traditional M–Z interferometer, the isolation of the new structure is enhanced greatly. When the frequency spacing reaches 50 GHz, its isolation is more than 25 dB. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 253–255, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20268
A novel LTCC power combiner
Authors: Ooi B. L. , Xu D. X. , Wang Y. , Chen B. , Leong M. S. 
Published: June 2004

AbstractA novel LTCC power combiner, which is adopted from conventional balun design, is presented. In contrast to the conventional balun network, our design provides one pair of nondifferential signals with minimum phase difference between the outputs. Experimental results are given in the paper to verify our theoretical analysis and design. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 255–257, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20269
Robust knowledge‐based neural‐network model for microstrip T‐junction structure
Authors: Hong Jingsong , Wang Bing‐Zhong 
Published: June 2004

AbstractIn this paper, a robust knowledge‐based neural‐network model (RKBNN), whose neurons in the hidden layer are all knowledge‐based neurons instead of conventional neurons, is proposed for the microstrip T‐junction structure. The RKBNN model is electromagnetically developed with a set of data that are produced using the method of moments (MoM) method. Through numerical experiments, many advantages have been shown by the RKBNN model over the conventional multilayer perceptron model. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 257–260, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20270
Experimental implementation of a wideband high‐gain 8‐array slot antenna for mobile communications
Authors: Jang Yong‐Woong 
Published: June 2004

AbstractThe experimental implementation of a T‐shaped microstrip‐fed printed 8‐element slot‐array antenna is presented in this paper. Although the use of a high relative permittivity (εr= 4.3) substrate usually restricts the operation bandwidth, the radiation resistance also has a low value. The dependence of design parametersld, offset on the bandwidth characteristics is investigated. The measured bandwidth of the 8‐array slot array antenna is 1.3933 to 2.5989 GHz, which is approximately 60.3% for theS11≤ −10 dB. The obtained 10‐dB return‐loss impedance bandwidth covers the DCS (1.71–1.88 GHz), PCS (1.85–1.99 GHz), IMT‐2000 (1.90–2.20 GHz), UMTS (1.92–2.17 GHz), WLL (2.40–2.48 GHz) bands. The measured peak gain of the 8‐array slot‐array antenna in the usable frequency band is more than approximately 10.5 dBi. This antenna is an attractive candidate for wireless, satellite, and mobile communications applications. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 260–262, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20271
High‐resolution NMR spectroscopic trends and assignment rules of metal‐free, metallated and substituted corroles
Authors: Balazs Yael S. , Saltsman Irena , Mahammed Atif , Tkachenko Elena , Golubkov Galina , Levine Joshua , Gross Zeev 
Published: June 2004

AbstractMajor advances over the last few years have facilitated the synthesis of a large variety of meso‐only substituted corroles that display interesting catalytic, therapeutic and photophysical properties. This work is the first to study extensively the NMR spectral characteristics of both metallated and non‐metallated triarylcorroles in various organic solvents and provide guidelines for easy and reliable assignments of 1D 1H spectra from trends of J coupling constants and chemical shifts. An excellent correlation is found between CC bond lengths derived from 3J(H,H) values and experimental lengths determined by x‐ray crystallography of the same molecules. The nuclear Overhauser effect provides a robust 1D 1H NMR tool for determining the selectivity of electrophilic substitutions. Variable‐temperature NMR and isotopic labelling reveal a single preferred tautomerization state and unsymmetric ring orientations at −70°C. The β‐pyrrole protons demonstrate long‐range heteronuclear couplings with the coordination core (15N) and with the ortho‐19F nuclei of the meso‐carbon aryl rings. In sum, application of multinuclear magnetic resonance to corroles and their metal complexes, through the compilation of chemical shifts and J couplings and the recognition of trends therein, provides basic information essential to reliable spectral assignments. Additionally, the conclusions drawn about the structures of corroles and the electron densities at various positions of the corrole macrocycle resulting from the application of high‐resolution NMR techniques are of importance to an in‐depth understanding of the molecular interactions and processes of this relatively new and rapidly expanding class of compounds. Copyright © 2004 John Wiley & Sons, Ltd.
Heteronuclear selective refocusing 2D NMR experiments for the spectral analysis of enantiomers in chiral oriented solvents
Authors: Farjon Jonathan , Baltaze Jean‐Pierre , Lesot Philippe , Merlet Denis , Courtieu Jacques 
Published: June 2004

AbstractWe report the use of carbon–proton heteronuclear selective refocusing 2D NMR experiments dedicated to the spectral analysis of enantiomers dissolved in weakly ordering chiral liquid crystalline solvents. The method permits the extraction of carbon–proton residual dipolar couplings for each enantiomer from a complex or unresolved proton‐coupled 13C spectral patterns. Illustrative examples are analysed and discussed. It is shown that an accurate determination of enantiomeric excess is possible. Copyright © 2004 John Wiley & Sons, Ltd.