bluuebunny/crossref_metadata_2025_split huggingface dataset:
RCS control using cascaded circularly polarized frequency selective surfaces and an AMC structure as a switchable twist polarizer
Authors: Euler M. , Fusco V. F. 
Published: January 2010

AbstractThis article presents a cascaded arrangement comprising a double‐layer frequency selective surface circularly polarizing (CPFSS) and a second screen that can be switched between artificial magnetic conductor (AMC), or perfect electric conducting, (PEC), states.The CPFSS consists of two stacked aluminum sheets patterned with periodic split ring structures. While the AMC is a PCB sheet patterned with metallic squares interconnected by links. By either open or short circuiting these links it is shown that the cascade of screens can be made to twist, or not to twist, an incident 45° linearly polarized signal through 90° upon reflection from the assembly. The system was designed and optimized using CST software and predictions were validated experimentally at X‐band. The results obtained show good agreement between experimental and measured monostatic reflection loss results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 577–580, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24979
RF MEMS tunable filter using micro fixed–fixed beam
Authors: Islam Md. Fokhrul , Mohd Ali Mohd Alauddin , Majlis Burhanuddin Yeop 
Published: January 2010

AbstractIn this article, a tunable bandpass filter using micro fixed‐fixed beam structure is designed, simulated, and fabricated. The filter is designed by micromachined capacitive bridges, with an original passive topology. The fabricated filter occupies a chip area of 12 × 3 mm2and achieved an insertion loss of less than 2 dB and return loss of less than −15 dB throughout the operation band, thereby tuning the filter centre frequency by 11% between 8.76 and 9.8 GHz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 592–597, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24981
CMOS passive wake‐up circuit for sensor network applications
Authors: Kim Hyungchul , Cho Hanjin , Xi Yao , Kim Minsu , Kwon Sungwook , Lim Joonhyung , Yang Youngoo 
Published: January 2010

AbstractA passive wake‐up circuit with high‐voltage sensitivity using standard CMOS technology has been designed and implemented.Voltage multipliers and inverter chain optimized for high‐voltage sensitivity have been proposed. A radio identification scheme to make peer‐to‐peer communication has also been proposed. The wake‐up circuit converts small‐RF input signals into a DC signal to trigger the interrupt. A duty cycle scheduling is adopted for an advanced power control. Using an RF input signal, whose center frequency is 870 MHz and input power is −29.3 dBm, we achieved an output voltage of 0.7 V, enough to trigger on the output. The fully integrated CMOS IC is fabricated using a 0.18‐μm standard CMOS process. The chip area is as small as 230 × 190 μm2. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 597–600, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24982
Characterization and modeling of nonlinear mixer behavior for 77‐GHz radar systems
Authors: Treml Markus , Wagner Christoph , Stelzer Andreas , Jäger Herbert 
Published: January 2010

AbstractA behavioral model describing the behavior of active mixers in the linear and the saturation mode of operation is presented. The model allows the simulation of effects caused by high‐level blocking signals. A 77‐GHz multi‐tone signal is used for characterizing the nonlinear behavior of the mixer. Because of the calculation of the nonlinearity in the complex baseband, the mixer behavior can be simulated very efficiently as necessary for the usability in complex radar system simulations. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 639–642, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24983
Linearization of a 3.7 GHz multi‐carrier GaN HEMT Doherty power amplifier using digital predistortion method
Authors: Jeong Jonghyuk , Van Juho , Cho Jaeyong , Kim Min‐Su , Cho Hanjin , Lim Kyung‐Hoon , Kwon Sung‐Wook , Choi Kyonggon , Kim Hyung‐Chul , Yoo Sungcheol , Park Cheon‐Seok , Yang Youngoo 
Published: January 2010

AbstractIn this article, a 3.7 GHz band Doherty amplifier based on GaN HEMTs, which is linearized using a digital predistortion method, is implemented for 4th generation wireless communication systems. The forward and reverse models of the Doherty amplifier for the predistortion consist of simple polynomials whose coefficients are extracted using a conventional least mean square error algorithm. Using a two carrier signal based on IEEE802.16e, whose PAR is 9.44 dB, an ACLR improvement of 10.74 dB is achieved to give an ACLR level of 41.74 dBc at an offset of 4.79 MHz. The overall efficiency of the Doherty power amplifier is 13.74%, which represents a 2.44% improvement compared with that of a balanced class‐AB power amplifier at an average output power of 36 dBm. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 634–638, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24984
An on‐chip two‐state single‐turn spiral inductor for reconfigurable RF circuit designs
Authors: Woods Wayne , Ding Hanyi , Wang Guoan , Mina Essam 
Published: January 2010

AbstractA two‐state single turn spiral inductor design is simulated in a 130 nm technology and another design is simulated and measured in a 45 nm technology. Measurements show an 80% inductance increase at 20 GHz in the 45 nm technology and a simulated 76% increase at 24 GHz in the 130 nm technology. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 673–677, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24985
Investigation of several terahertz electromagnetic band gap structures
Authors: Wu Ziran , Young Abram , Gehm Michael , Xin Hao 
Published: January 2010

AbstractSeveral THz electromagnetic band gap (EBG) structures are investigated and demonstrated.Various design, fabrication, and characterization methods and techniques are utilized and compared. These THz EBG structures may enable future high performance EBG based THz components. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 678–686, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24986
Influence of strength and asymmetry of the coupling between a cavity and a transmission line on measurement of complex permittivity
Authors: Ikeda Masaaki , Nishida Kazuaki , Nagata Yasuyuki , Shimasaki Hitoshi , Akiyama Masahiro 
Published: January 2010

AbstractInfluence of the strength and the asymmetry of input‐output ports on the measurement of complex permittivity by the resonant cavity perturbation method was investigated experimentally.We adopted the |S21| as the criterion of the strength, and the difference between S11 and S22 as the criterion of the asymmetry. When the coupling is symmetric, the real part of permittivity can be evaluated in strong coupling state up to −3 dB of coupling. The imaginary part of permittivity can be evaluated up to −14 dB of coupling. Imaginary part of the relative permittivity ε″r was calculated using the conventional equation, which is based on the complete symmetry of the coupling of input‐output ports. For the measurement of high‐Q materials, calculated ε″r is strongly affected by the asymmetry in the strongly coupled region. For the measurement of lossy materials, the inevitable asymmetry and the strong coupling allow enough exact evaluation of ε″r. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 706–709, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24988
CMOS multi‐band wireless direct‐conversion receiver for SDR
Authors: Lee Sangho , Choi Sanghyun , Lee Jaeseok , Park Jihyun , Kim Hyeongdong 
Published: January 2010

AbstractIn this article, a CMOS multistandard wireless direct‐conversion receiver is designed. The receiver is composed of three components: low noise amplifier, voltage‐controlled oscillator, and mixer. In details, the designed receiver adopts direct‐conversion architecture and accommodates three standards: WCDMA, Wibro (or mobile WIMAX), and CDMA 2000 1×: 1.84–2.4 GHz. The designed mixer is a passive sub‐harmonic doubly balanced structure, the VCO is a back‐gate coupling quadrature VCO, and the LNA is a differential structure. Each component is designed with relevance to direct‐conversion architecture. The designed mixer has no flicker noise theoretically because the mixing transistors operate in the triode region. Also, DC offset problem is avoided, because local oscillator frequency is half of RF frequency and the port isolation is improved by the innate characteristic of a balanced structure. The VCO generates a quadrature signal and the oscillation frequency is half of RF frequency to drive designed sub‐harmonic mixer. No coupling transistors are needed due to the use of back‐gate coupling to reduce flicker noise. Back‐gate coupling means that the body of a transistor is used as another gate. The LNA, which adopts a well‐known cascade structure, is designed as a differential structure to suppress common mode noise and to drive a doubly balanced mixer. All designed components are fabricated by the TSMC 0.18‐μm RF CMOS process. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 718–721, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24989
Narrow band‐stop filters design with I‐shape resonators
Authors: Yeung S. H. , Man K. F. 
Published: January 2010

AbstractThe design issues of narrow band‐stop filters using I‐shape resonators are discussed. The resonators are cascaded to improve the band‐stop attenuation and to achieve multiple stop‐bands. The performance of the resonator and its transmission line model will be presented. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 757–763, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24992
Miniaturized microstrip dual‐band power divider on localized substrate integrated artificial dielectric
Authors: Tang Wanchun , Wang Xiaoke , Wen Zhonghui 
Published: January 2010

AbstractLocalized substrate integrated artificial dielectric (L‐SIAD) is a structure with only metallic posts right under microstrip line, leading to planar microstrip circuit miniaturization.When compared with original substrate integrated artificial dielectric (SIAD), the fabrication for L‐SIAD will be more economical and easier, whereas the characteristics of L‐SIAD is almost the same as that of original SIAD. A microstrip dual‐band power divider on L‐SIAD exhibits an area reduction of about 40% compared with that on regular substrate. By proper design of L‐SIAD, more area reduction can be achieved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 644–648, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24997
Design of three new types of active quasi‐circulator modules
Authors: Bahri Reza , Abdipour Abdolali , Moradi Gholamreza 
Published: January 2010

AbstractAnalysis and design of three novel active quasi‐circulator modules are presented, which use the nonreciprocal properties of microwave unilateral power divider/combiner and amplifiers.These modules have many variations and can be used for very wide frequency range depending on the type of the unilateral amplifier used. Also, they can be used in MMICs as active circulators and also in other high‐frequency applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 689–694, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24998
Interference analysis between ZigBee transceivers at 2.4 GHz frequency bands in a multiple integrated laser engagement system
Authors: Yoo Hojoon , Kwak Hyun‐Sang , Kim Jong‐Heon , Lee Chan‐Joo 
Published: January 2010

AbstractInterference scenarios between ZigBee transceivers in a multiple integrated laser engagement system have been presented.The permissible output power of interfering transmitters measured in the case of a direct link and a direct link with repeaters. The later was reduced by 10 dB relative to that for the direct link. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 662–665, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24999
A 2.4 GHz CMOS diversity receiver having a soft‐start regulator for wake‐up
Authors: Kwon Yong‐iL , Cho Han‐Jin , Lee Hai‐Young 
Published: January 2010

AbstractAn improved diversity receiver having a new regulator for stable power supply in a 0.18 μm CMOS technology is presented. The regulator with soft‐start is implemented to eliminate the battery damages at initial power‐up. To reduce the external components, two switches for antenna diversity are integrated in front of LNA on the chip. A stacked inductor technique is adopted to reduce the chip area. The simulation and measurement results show that the soft‐start time of the regulator can be controlled by a variable resistor from 200 μS to 6.2 mS. The front‐end (LNA and mixer) can achieve a voltage gain of 33.5 dB, a noise figure (NF) of 3.8 dB, and 23 dB of the isolation between antennas when consuming 3.9 mW with a 1.8 V power supply. The NF includes the loss of a BALUN, BPF, and switches. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 611–615, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25000
Class‐B amplifier using a periodic loop combiner
Authors: Eccleston Kimberley W. 
Published: January 2010

AbstractAn N‐way combiner that provides low‐valued load impedances for FETs is presented. The combiner comprises periodic loops of transmission lines with moderate valued characteristic impedance. Its area is directly proportional to the number of FETs to be combined. For application in class‐B amplifiers, even‐harmonic suppression is considered. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 725–728, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25001
Improved tapered slot‐line antennas by using grating loading
Authors: Zhang Peng , Zhang Wen‐Xun 
Published: January 2010

AbstractA new scheme for improving linearly tapered slot‐line antenna (LTSA) has been proposed in this article. By setting five metallic strips as a grating into the slot‐area of LTSA, a 2 dB increment of gain over the frequency range of (6.0–9.5) GHz and the bandwidth of (5.3–9.6) GHz for VSWR <2.0:1 are obtained. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 728–731, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25002
Experimental results of optically controlled parallel guide directional coupler at W‐band
Authors: Fickenscher Thomas 
Published: January 2010

AbstractOptical control of the coupling characteristics of parallel guide directional couplers in image guide technology is investigated experimentally in suppression mode at W‐band. Compared with previous designs, the control range of coupling versus illumination intensity is significantly increased because of a symmetric layout of the active section in dark state. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 626–629, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25014
A low complexity solution for integrating video surveillance and RFID in remote scene monitoring
Authors: Tsang P. W. M. , Yung K. N. , So K. H. , Cheung K. W. K. 
Published: January 2010

AbstractIn this article we reported, for the first time, a low complexity Field Programmable Gate Array solution for integrating video surveillance into RFID units. The method is comprised of two major building blocks, namely a RFID transmitter operating at a maximum bandwidth of 250 kbps, and a near computation free image compression engine based on an enhanced Decomposed Adaptive Decimation scheme. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 775–779, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25017
Six‐port transceiver for 6–9 GHz ultrawideband systems
Authors: Serban Adriana , Östh Joakim , Owais  , Karlsson Magnus , Gong Shaofang , Haartsen Jaap , Karlsson Peter 
Published: January 2010

AbstractAn ultrawideband 6–9 GHz six‐port correlator is designed and manufactured.Based on this six‐port correlator, behavioral models, and true component circuit designs of a transceiver are developed to study the performance of the proposed direct conversion ultrawideband transceiver topology. A new six‐port modulator with controllable impedance terminations implemented with a field effect transistor in the linear operation region is presented. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 740–746, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25021
Impact of laterally asymmetric channel and gate stack architecture on device performance of surrounding gate MOSFETs
Authors: Kaur Harsupreet , Kabra Sneha , Haldar Subhasis , Gupta R. S. 
Published: January 2010

AbstractA new device design laterally asymmetric channel gate stack (LACGAS) SGT is proposed, and its impact on device performance is examined. By using analytical modeling and numerical simulations, the novel features of this structure are studied, and it is demonstrated that LACGAS offers superior performance when compared with conventional devices. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 746–750, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25022
60 GHz SoC/SoP radio system for high data‐rate transmission
Authors: Eun K. C. , Lee J.J. , Jung D. Y. , Cho S. J. , Kim H. Y. , Song I. S. , Lee Y. C. , Chang W. I. , Oh I. Y. , Yoon K. S. , Kang S. H. , Park C. S. 
Published: January 2010

AbstractWe present the 60 GHz CMOS and system‐on‐package (SoP) research activities in Korea Advanced Institute of Science and Technology for high data‐rate and short‐range wireless communication. A low‐power single‐chip resonant frequency CMOS receiver for 60 GHz mobile terminals consists of four‐stage current reuse LNA, resistive mixer, Ka‐band low‐phase noise VCO, high‐suppression frequency doubler, and two‐stage current reuse drive amplifiers. The receiver conversion gain and input P1dB are −9.5 dB and −12.5 dBm, respectively, with a size of 2.67 × 0.75 mm2and power consumption of 21.9 mW. The integration and communication tests of a transmitter/receiver (Tx/Rx) radio have been demonstrated at a data rate of 3 Gbps for short‐range transmission and with a communication distance of over 3.5 m at 650 Mbps data rate. The design and fabrication of mmW subcircuits, such as low‐loss transmission lines and transitions with noble air cavity structures, a high‐Q resonator using zigzagged dual‐row via posts and a λ/4 short stub, and the monolithic integration of band‐pass filter and antennas, have been performed for low‐temperature cofired ceramic SoP integration with a size of 37 × 11 mm2for the whole Tx or Rx radio. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 667–673, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25024
A novel approach to reduce the near field electromagnetic scattering for designing HAC compatible mobile phones
Authors: Zhao Anping , Ollikainen Jani , Thaysen Jesper , Bodvarsson Thorvaldur 
Published: January 2010

AbstractBy splitting the upper printed wiring board (PWB) of a fold mobile phone into two parts and connected with an inductor, the near field electromagnetic scattering of mobile phones can be significantly reduced. In fact, the gap between the split PWB tends to act as a capacitor. Hence, the gap and the inductor form an LC band‐stop filter embedded in the PWB. With the help of this filter, the current flowing on the PWB can be constrained before it reaches the end of the PWB, which results in less electromagnetic field scattering in the hearing aid compatibility (HAC) region, and thus, leads to an HAC compatible mobile phone design. The design principle works well for fold phones with both one‐hinge and two‐hinge cases. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 709–715, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25026
A new assignment technique of 2D‐NMR spectra by spin‐lock sequence to a tripeptide containing tryptophan in water
Authors: Watanabe Eiji , Yamakura Fumiyuki , Kan Hirosaki 
Published: January 2010

AbstractWe developed a new assignment technique of tryptophan residues using pulsed field gradient TOCSY–ROESY (PFG‐TORO) and pulsed field gradient TOCSY–ROESY–TOCSY (PFG‐TOROTO) techniques in water. Connectivity from βH to ζ2H (H‐7) via ε1H (H‐1) and δ1H (H‐2) in the TORO spectrum and from βH to ζ3H (H‐5) and η2H (H‐6) via ε1H (H‐1) and δ1H (H‐2) in the TOROTO spectrum could be able to assign each of the protons of the indole rings. Copyright © 2010 John Wiley & Sons, Ltd.
Transgenic sperm produced by electrotransfection and allogeneic transplantation of chicken fetal spermatogonial stem cells
Authors: Yu Fei , Ding Li‐Jun , Sun Guo‐Bo , Sun Peng‐Xiang , He Xian‐Hong , Ni Li‐Gang , Li Bi‐Chun 
Published: January 2010

AbstractTo study self‐renewal, genetic modification, and differentiation of avian spermatogonial stem cells (SSCs), we isolated chicken SSCs from fetal testes on the 16th hatching day via enzyme digestion, and then cultured the SSCs over 2 months after purification in vitro. SSCs were identified by alkaline phosphatase staining and SSEA‐1 fluorescence. The EGFP gene was transfected into SSCs by three different methods: electroporation, liposome transfer and calcium acid phosphate precipitation. The transfection rate and cell survival rate using electroporation were higher than when using liposomes or calcium acid phosphate (20.52% vs. 9.75% and 5.61%; 69.86% vs. 65.00% and 51.16%, respectively). After selection with G418 for 8 days, the transgenic SSCs were transplanted into the testes of cocks treated with busulfan. Twenty‐five days after transplantation, the recipients' semen was light ivory in color, and the density of spermatozoa was 3.87 (×107/ml), with 4.25% expressing EGFP. By 85 days after transplantation, the number of spermatozoa increased to 32.7 (×107/ml) and the rate of EGFP expression was 16.25%. Frozen sections of the recipients' testes showed that transgenic SSCs were located on the basal membrane of the seminiferous tubules and differentiated into spermatogenic cells at different stages. The EGFP gene was successfully amplified from the DNA of all recipients' semen samples. Mol. Reprod. Dev. 77: 340–347, 2010. © 2010 Wiley‐Liss, Inc.