bluuebunny/crossref_metadata_2025_split huggingface dataset:
A multistandard dual‐mode fully‐integrated miniature, low‐power‐consumption 860–960 MHz CMOS RFID reader for mobile communications, sensing, and networking
Authors: Lee Sanghun , Kwon Hyukje , Ryu Changho , Kim Sungwan , Kang Kyoungyong , Chun Seonghun , Lee Pyunghan , Nguyen Cam 
Published: August 2012

AbstractA fully‐integrated single‐chip radio frequency identification (RFID) reader consisting of zero‐IF receiver, direct up‐conversion transmitter, sigma‐delta phase‐locked loop synthesizer, and modulation/demodulation (MODEM) module has been developed using 0.18 μm CMOS process.The RFID reader operates from 860–960 MHz in steps of 100/200 kHz, supporting a multiband global standard suitable for USA, Europe, and Korea for both passive and active communication. It is specifically designed to achieve small size, low spur levels, low power consumption, and complete integration while meeting requirements for short‐range applications. The developed reader exhibits transmitting output power of −7.4 dBm controllable over 15 dB range, receiver's P1dB of −7 dBm, sensitivity of −70 dBm, and IF spectral purity of more than 46.4 dBc at frequencies greater than 140.625 Hz away. The complete RFID reader including transmitter, receiver, synthesizer, ADC, DAC, and MODEM occupies 10.9 mm2 and consumes 116.18 mW. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2487–2491, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27117
A three‐frequency feed for millimeter wave radiometry
Authors: Hoppe D. J. , Khayatian B. , Sosnowski J. B. , Bruneau P. , Johnson A. , Reising S. C. , Brown S. T. 
Published: August 2012

AbstractA high‐performance millimeter‐wave feed, designed for a broad‐band radiometry application is presented. The feed provides three separate output ports in the 87–97 GHz, 125–135 GHz, and 161–183 GHz bands. Measured return loss is better than 20 dB in the upper two bands and 15 dB in the lowest band, and good pattern symmetry is obtained throughout all three frequency bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2483–2487, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27118
Numerical and experimental demonstration of a coordinate transformation‐based azimuthal directive emission
Authors: Wu Xinying , Tichit Paul‐Henri , Burokur Shah Nawaz , Kirouane Souad , Sellier Alexandre , de Lustrac André 
Published: August 2012

AbstractThis article deals with the modeling, practical implementation, and characterization of an azimuthal directive antenna around 10 GHz. The design of the antenna is based on transformation optics concept by transforming the radiation of a plane source into an azimuthal radiation. This coordinate transformation procedure is achieved by modifying the electromagnetic properties of the space around the plane source. Metamaterials presenting electric and magnetic resonances are used to produce the effective material parameters necessary for the transformation. S11 parameter and direct far‐field measurements are performed on a fabricated prototype to experimentally demonstrate the narrow beam profile and the beam deflection. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2536–2540, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27122
On the bending effects on artificial magnetic conductors
Authors: Khaleel Haider R. , Al‐Rizzo Hussain M. , Rucker Daniel G. 
Published: August 2012

AbstractIn this letter, we present the performance of a typical artificial magnetic conductor (AMC) under different bending extents. Square patch array‐based AMC is employed as a benchmark to demonstrate the dependence of AMC characteristics on the degree of curvature. We show that increasing the extent of bending leads to a shift to a higher resonance frequency and bandwidth degradation which suggests the importance of such analysis when designing AMC structures for conformal applications. Finite element method full wave electromagnetic solver has been employed to extract the reflection phase profile of the structure under study. To the best of the authors' knowledge, this kind of study is being reported for the first time. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2503–2505, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27124
Small‐size WWAN handset antenna disposed at a small notch in the system ground plane
Authors: Wong Kin‐Lu , Kao Yeh‐Chun , Chu Fang‐Hsien 
Published: August 2012

AbstractAn internal WWAN (824–960/1710–2170 MHz) handset antenna suitable to be disposed at a small notch of 35 × 6 mm2 in the system ground plane of the handset is presented.Also, the antenna has a low profile of 3 mm above the main circuit board on which the system ground plane is printed. That is, the antenna occupies a small volume of 35 × 6 × 3 mm3 or 0.63 cm3 only (much less than 1 cm3). To fit in the small notch, a quarter‐wavelength gap‐coupled loop antenna is applied, which not only can be configured into a compact configuration but also can be in proximity to the surrounding ground plane. With the aid of a matching network, which is comprised of a series chip inductor and a band‐stop matching circuit, two wide operating bands to, respectively, cover the GSM850/900 and GSM1800/1900/UMTS operation are obtained. Details of the proposed antenna are described. The applied techniques in achieving wideband operation with a small antenna size are discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2498–2503, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27125
A novel microstrip lowpass filter using compact microstrip resonant cells and uniquely shaped defected ground structures
Authors: Yang Yang , Zhu Xi , Karmakar Nemai C. 
Published: August 2012

AbstractA novel microstrip lowpass filter (LPF) with high selectivity and wide stopband is proposed in this letter.The proposed LPF consists of three compact microstrip resonant cells, two E‐shaped feed‐lines on the top layer and four defected ground structure (DGS) slots on the ground plane. The top layer LPF is designed to have a sharp roll‐off characteristic, whereas the engineered DGS slots on the ground plane are used to reduce the passband ripples and extend the stopband bandwidth of the proposed LPF. A selectivity of 53.4 dB/GHz is achieved. The stopband with an attenuation level of 20 dB is obtained from 2.96 to 13.2 GHz. The filter is optimally designed, fabricated, and measured. Both simulated and measured results are presented, which show a good agreement between simulation and measurement. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2462–2464, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27126
A tunable planar inverted‐f antenna for digital video broadcast‐handheld applications
Authors: Manteghi Majid 
Published: August 2012

AbstractA compact varactor‐tuned planar inverted‐F antenna is introduced for digital video broadcast‐handheld (DVB‐H) applications. The antenna size is 20 × 40 × 5 mm3, making it particularly suitable as an internal antenna. A full‐wave simulator is used to calculate the scattering matrix of the antenna as a two port network. A circuit model including the two‐port antenna and its tuning circuitry is simulated using a circuit simulator. The simulation results show that the antenna is continuously tunable within the entire frequency range of the DVB‐H standard, 470–702 MHz. The antenna is prototyped and tested. The measured results are in agreement with the simulation data. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2635–2638, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.21728
3.5 GHz WiMAX GaN doherty power amplifier with second harmonic tuning
Authors: Fang Jie , Moreno Jorge , Quaglia Roberto , Camarchia Vittorio , Pirola Marco , Guerrieri Simona Donati , Ramella Chiara , Ghione Giovanni 
Published: August 2012

AbstractThe article presents the design, realization, and experimental validation of a GaN‐based hybrid Doherty power amplifier for WiMAX base‐stations at 3.5 GHz. The amplifier exploits, for the first time as far as authors' knowledge goes, a second harmonic tuning scheme designed to further improve the efficiency in the Doherty region. The amplifier is based on a packaged GaN HEMT from Cree, and shows a saturated output power exceeding 43.2 dBm (21.5 W), a Doherty high‐efficiency region in excess of 6 dB output back‐off, with a first peak and maximum drain efficiency at saturation of 55 and 61%, respectively. The amplifier, with baseband digital predistortion, is compliant with the standard emission mask in the presence of a 9 dB peak to average power ratio WiMAX input and exhibits a weighted efficiency as high as 40%. The performances of the designed amplifier favorably compare with the state of the art for the same application. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2601–2605, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27132
Fabrication of diamond‐structured multiceramic coupling photonic crystal and its ultra‐wide bandgap properties
Authors: Liang Qingxuan , Li Dichen , Yang Gai 
Published: August 2012

AbstractThe diamond‐structured multiceramic coupling photonic crystal (PC) containing alumina and yttira simultaneously was successfully fabricated by stereolithography and multistep gel‐casting process. Compared with the bandgap width of the alumina PC or the yttira PC separately, the bandgap width of the multiceramic coupling PC is 8.5 GHz that became 134.9% of the alumina PC's bandgap width and 146.6% of the yttira PC's bandgap width along the direction Γ‐X<100>, and the resulting gap‐midgap ratio significantly increased too. These results agreed well with the simulation results by finite integration technique. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2569–2572, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27134
A compact hairpin bandpass filter using multilayer stripline folded quarter‐wavelength resonators
Authors: Gu Xiaowei , Yang Lingyun , Bao Xiaoan , Yu Chenghai , Shi Qingjiang 
Published: August 2012

AbstractThis article presents a compact hairpin bandpass filter using multilayer stripline folded quarter‐wavelength resonators in a low‐temperature cofired ceramic substrate.Using the new structure designs accomplish the vertical coupling in multilayer system, the size of the proposed filter can be reduced about 50% compared to an equivalent single‐layer hairpin resonator filter. As an example, an L‐band filter centered at 1.10 GHz with a fractional bandwith of 13.5% is designed, fabricated, and measured. The measured results of the fabricated filter agree very well with the electromagnetic simulations. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2627–2629, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27139
Design of a patch antenna with dual‐band radar cross‐section reduction
Authors: Miao Zhilong , Huang Cheng , Ma Xin , Pu Mingbo , Ma Xiaoliang , Zhao Qin , Luo Xiangang 
Published: August 2012

AbstractIn this article, we present a method for reducing radar cross‐section (RCS) of a patch antenna in two frequency bands. This method is based on the absorbing metamaterial loaded around the patch exciting source. The metamaterial is composed of double‐square‐loop structure inserted with resistors, which can absorb incident wave at two frequency bands. The RCS characteristic of the proposed antenna is investigated by numerical simulation and measurement. Simulated result shows that RCS is obviously reduced by about 8 dBsm at 5.8 GHz within the operating frequency of the antenna and 9 GHz out of working band, compared with the conventional patch antenna. In addition, it is found that the loaded metamaterial almost have no negative influences on the antenna performance, and the gain of the antenna is improved by 0.6 dB. There is a good agreement between measured and simulated results. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2516–2520, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27144
Modeling of electronic transport in metallic carbon nanotube interconnects in the presence of electron‐phonon interactions
Authors: Parkash V. , Goel A. K. 
Published: August 2012

AbstractMetallic carbon nanotubes are being considered as a candidate to potentially replace copper as an interconnect material in next generation nanotechnology integrated circuits.In this article, we have examined the electronic transport behavior in metallic carbon nanotubes using a self consistent nonequilibrium Green's function method. We have included the effects of electron‐phonon interactions in our model. Results show that conductivity decreases in the ballistic limit due to localized disorder effects even with a weak disorder potential. We are also able to show that optical phonons (both LO and TO modes) are the dominant mechanisms that govern the mean free path of conduction in the nanotube. Our calculations show an excellent agreement with experimental results available in the literature. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2477–2483, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27145
A novel microstrip parallel‐coupled line structure for ultrawideband microwave filters
Authors: Shaman Hussein , Hong Jia‐Sheng 
Published: August 2012

AbstractA novel configuration of microstrip three parallel‐coupled line structure is proposed in this letter. This new structure consists of only one section of three parallel‐coupled lines to design a compact ultrawideband (UWB) bandpass filter to obtain the Federal Communications Commission's spectrum mask. To create transmission zeros around the desired UWB passband, the middle line of the three coupled lines is extended and shortened to ground at one end. As a result, this filter significantly improves the selectivity of both edges of the UWB passband and the out‐of‐band characteristics. For verification, the proposed filter is designed, simulated, and fabricated where excellent agreement is obtained. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2510–2513, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27146
Miniaturized planar ultra‐wideband antenna on a trapezoidal ground fed with a tapered microstrip line
Authors: Zhang Yangjun , Hara Masayuki 
Published: August 2012

AbstractA miniaturized planar ultra‐wideband (UWB) antenna is proposed.The antenna is fed with a tapered microstrip line. A trapezoidal ground pattern is studied to improve impedance matching over the UWB frequency range. The total size of proposed antenna is 22 × 25 mm2, which is much smaller than the antenna with a conventional square ground. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2468–2472, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27148
Pin diode‐based variable directional coupler
Authors: Bulja Senad , Grebennikov Andrei 
Published: August 2012

AbstractAnalysis and design of a novel variable directional coupler based on a parallel line directional coupler using the even‐odd mode technique are proposed. In this coupler, the variation of coupling is achieved using a PIN diode, connected to the nominally coupled port of a parallel line directional coupler, while the output is derived from the normally isolated port. To verify the theory, a parallel microstrip line coupler is fabricated on a substrate with εr = 3.66, h = 762 μm, and tanδ = 0.006 and measured. The measured results show a variation in the transmission coefficient of nearly 20 dB, while at the same time, the change in the direct arm insertion loss is lower than 0.2 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2643–2646, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27151
Microwave doppler radar for heartbeat detection vs electrocardiogram
Authors: Obeid Dany , Zaharia Gheorghe , Sadek Sawsan , El Zein Ghaïs 
Published: August 2012

AbstractThis article presents a contact‐less system to detect the heartbeat activity from a distance of 1 m. The proposed system is based on using a vector network analyzer. Measurements are performed at 16 GHz for different power levels between 0 and −25 dBm. Results for two S‐parameters are obtained and compared to an electrocardiogram simultaneous signal in terms of heartbeat rate and heart rate variability. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2610–2617, 2012; this online at wileyonlinelibrary.com. DOI 10.1002/mop.27152
Pad‐to‐pad isolation of vertical interconnects using magnetically aligned anisotropic conductive adhesive
Authors: Moon Sungwook 
Published: August 2012

AbstractSelf‐alignment of vertical interconnects using a magnetically aligned anisotropic conductive adhesive (MA‐ACA) is a unique method, which is useful in high‐density electronic applications.This material is created by magnetic interaction between loading conductive particles in an epoxy medium. To analyze electromagnetic interference between adjacent I/O pads, a lumped component model was suggested, consisting of shunt capacitance, parallel capacitance, series resistance, series inductance, and coupling capacitance. The equivalent circuit model was validated through the measurement of test samples with MA‐ACA interconnects. Also, the pad‐to‐pad isolation of the MA‐ACA was compared to that of lead/tin solder connections. As a result, at high frequencies the pad‐to‐pad isolation of the MA‐ACA interconnects was observed to be mainly degraded by a larger coupling capacitance due to the presence of metallic interconnects at a transition region. Therefore, a packaging approach using the characterized RF performance of the MA‐ACA interconnects is expected to be designed for high‐density electronic circuitry. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2606–2610, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27153
Compact triple‐band monopole antenna with two strips for WLAN/WiMAX applications
Authors: Zhang Li , Chen Bo , Jiao Yong‐Chang , Weng Zi‐Bin 
Published: August 2012

AbstractA novel printed monopole antenna with triple‐band operations has been designed and implemented. The antenna consists of a microstrip feed line, a ground plane, and two strips that play very important roles in the antenna performance. Experimental results indicate that two more resonant modes can be obtained by using the two strips, and three operating bands, which can effectively cover 2.4/5.8 GHz WLAN and 3.5 GHz WiMAX bands, can be obtained by adjusting the dimensions of the two strips. The proposed antenna has a small size of dimensions 12 × 32 mm2. Detailed designs and experimental results are reported in this article. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2650–2653, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27154
A double‐balanced subharmonic passive mixer with an integrated quadrature local oscillator in 0.18 μm CMOS
Authors: Huang Deping , Li Changzhi , Chen Jinghong 
Published: August 2012

AbstractThis letter presents a double‐balanced subharmonic passive mixer designed in a 0.18 μm CMOS technology.The biasing condition of the passive mixer is analyzed to optimize its conversion loss and local oscillator (LO) to RF/IF leakage performances. The four phases required for the mixer were generated using an on‐chip LO and a divide‐by‐two circuit. The mixer converts an RF signal ranging from 3.5 to 6.7 GHz to an IF signal using an LO of 2.5 GHz with a voltage conversion loss of 7.2 ± 1.5 dB. The measured 1 × LO and 2 × LO leakages to the RF/IF port are −25/−60 dBm and −35/−65 dBm, respectively. The measured input third‐order intercept point (IIP3) of the mixer is −2 dBm. The circuit operates from a 1.8 V supply and consumes 45 mW of power. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2617–2619, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27156
Design of a compact wide‐bandwidth band‐pass filter using a parallel‐coupled structure
Authors: Yoon Ki‐Cheol , Lee Jong‐Chul 
Published: August 2012

AbstractIn this article, a broad bandpass filter (BPF) with a parallel‐coupled line (PCL) structure is proposed. In general, a BPF with a PCL structure has a limited bandwidth of 20%. A broader range of bandwidth than this requires a very narrow coupling‐gap that can hardly be realized. In this research, a new smaller‐sized broad‐BPF using a new type of PCL is presented. The new broad BPF shows a measured insertion loss of less than 0.31 dB and a return loss of better than 19.2 dB at the center frequency of 5.8 GHz with a 70% broad bandwidth. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2581–2584, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27157
Planar low‐pass filters based on hilbert fractal
Authors: Zemlyakov Kirill , Crnojevic‐Bengin Vesna 
Published: August 2012

AbstractMultiple Hilbert fractal lines with short circuits placed at specific positions are used to design two types of very compact planar low‐pass filters with high rate of cutoff. A simple design procedure is fractals shown, based on estimation of quasi‐lumped elements formed by the fractal line. Fabricated filters compare favorably with recently published filters, both in terms of size and performances. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2577–2581, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27158
Stub‐loaded bent monopole antenna with independent frequency tuning capability for compact wireless USB dongles
Authors: Jeong Seong Jae , Hwang Keum Cheol 
Published: August 2012

AbstractIn this article, compact monopole antenna with independent resonant frequency tuning capability is proposed.The antenna radiating patch consists of a simple, bent monopole element and an open stub. The bent monopole acts as a main radiator in 2.5 GHz band, whereas the open stub serves in 5.5 GHz band. A prototype of the proposed antenna was fabricated, and the reflection and radiation characteristics were measured to validate the antenna performances. Measured impedance bandwidths (VSWR < 2) exhibits dual‐broadband resonances, which are 2.08–3.02 GHz (lower band) and 5.13–6.15 GHz (upper band), corresponding to 36.9 and 18.1%, respectively. Therefore, VSWR bandwidth of the proposed design covers not only the WiBro, WiMAX, Bluetooth, 2.4 GHz WLAN, S‐DMB, but also the 5.2/5.8 GHz WLAN services. The peak gain was 5.76 dBi. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2548–2552, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27159
Numerical study of singularity extraction in MoM integrals for scattering from bodies of revolution
Authors: Resende Úrsula C. , Moreira Fernando J. S. , Pereira‐Filho Odilon M. C. 
Published: August 2012

AbstractThe analysis of electromagnetic scattering by the method of moments (MoM) leads to integral equations with singularities in their kernels. In this work, a numerical study of a particular technique for the extraction of those singularities arising in the analysis of the scattering from conducting and dielectric bodies of revolution (BOR), particularly spheres and cylinders is conducted. It is demonstrated that when the singularity extraction is applied, the numerical solution converges for a two‐point Gaussian quadrature. It is also shown that the MoM matrix condition number is affected by the number of segments used to describe the BOR generatrix and this influence depends on the behavior of the surface current distribution. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2543–2548, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27160