bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study of two‐tone intermodulation products in a communications modulator
Authors: Madero‐Ayora María J. , Allegue‐Martínez Michel , Crespo‐Cadenas Carlos , Reina‐Tosina Javier , Navarro‐Lázaro Javier 
Published: November 2010

AbstractThis article presents the experimental nonlinear characterization of a quadrature modulator following a two‐tone test approach. The observed intermodulation products show different slopes with respect to the desired carrier level that can be predicted by a simple model. Measurements for two‐tone tests versus carrier level and tone spacing are discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:58–61, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25639
A novel digital active homodyne demodulation scheme based on square‐wave phase modulation for interferometric fiber‐optic sensors
Authors: Feng Xiujuan , Zhang Chunxi , Liang Sheng , Li Chuansheng , Zhang Chaoyang 
Published: November 2010

AbstractA novel digital active homodyne demodulation scheme to eliminate the signal fading in interferometric fiber‐optic sensors is proposed. The error signal is obtained by the square‐wave phase modulation and then the digital correlation detection technique is applied to demodulate the low‐frequency environmental phase drift and generate the offset phase, which is then fed back the integrated optical phase modulator to lock the interferometer in quadrature. The high‐frequency signal phase can be read out and recovered from the photodetector output with the interferometer in quadrature. The simulation and experimental results verify the feasibility of the proposed scheme, which obviates the feedback integrator saturation and the system resetting problem encountered in the conventional active homodyne detection schemes. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:20–23, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25640
A fully integrated low voltage (0.5 V) X‐band CMOS low noise amplifier
Authors: Liu Baohong , Zhou Jianjun , Mao Junfa 
Published: November 2010

AbstractIn this article, a 0.5 V X‐band low noise amplifier (LNA) composed of two common‐source stages is designed and fabricated with 0.18 um CMOS technology.Based on the structure of cascaded common‐source stages and forward body bias technology, the supply voltage is reduced. Measurement results show that the circuit can operate at supply voltage of 0.5 V with 8 mA current occupation. The gain is 9.1 dB, noise figure is 5.0 dB, and IIP3 is −8.5 dBm at frequency of 8.9 GHz. The whole performance of the amplifier defined by two kinds of figure‐of‐merits is compared with some published LNAs. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:17–20, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25641
Design of triple‐band antenna for PCS/WLAN/UWB applications
Authors: Park Sang Y. , Park Jong K. 
Published: November 2010

AbstractIn this article, we have proposed a triple‐band antenna with L and T‐shaped stubs for PCS/WLAN/UWB applications. The proposed antenna consists of two symmetrical strips, two‐steps, and L and T‐shaped stubs. Two techniques are used to produce the resonances at each frequency bands, the low dispersion, and good impedance matching. The proposed antenna has an omni‐directional radiation pattern, compact size, low dispersion, and low cost. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:235–238, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25642
Application of hybrid finite‐difference mode‐matching method to analysis of structures loaded with axially symmetrical posts
Authors: Kusiek A. , Mazur J. 
Published: November 2010

AbstractIn this study, a new hybrid method is proposed to the analysis of waveguide structures loaded with arbitrary configuration of axially symmetrical posts.The method is based on a combination of finite difference frequency domain method, mode‐matching technique, and an analytical iterative scattering procedure. The results concerning the accuracy of the proposed technique are discussed. The validity of the proposed approach is verified with the analytical mode‐matching method, own measurements, commercial software, and the results published in literature. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:189–194, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25644
Analysis of transient electromagnetic scattering using UV method enhanced time‐domain integral equations with Laguerre polynomials
Authors: Wang Quanquan , Shi Yifei , Li Mengmeng , Fan Zhenhong , Chen Rushan , Xia Mingyao 
Published: November 2010

AbstractIn this article, the multilevel UV algorithm is utilized to reduce both the memory requirement and CPU time in the time‐domain combined field integral equation (TD‐CFIE) method to analyze transient electromagnetic scattering from conducting structures.The UV method is kernel‐independent, and is based on the rank‐deficiency feature of the impedance submatrix which represents far interaction. To obtain an unconditionally stable solution, finite orders of weighted Laguerre polynomials are used as temporal basis functions and the unknown expansion coefficients of the time variable are solved recursively order by order, as the so‐called matching‐on‐in‐order (MOO) procedure. RWG basis function is used as the spatial basis function for its flexibility in modeling arbitrary geometries. The spatial and temporal testing procedures are separate, and both of them are carried on with the Galerkin's method. Numerical results are given to verify the proposed method. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:158–163, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25646
Modified bow‐tie slot antenna for the 2.4/5.2/5.8 GHz WLAN bands with a rectangular tuning stub
Authors: Yoon Joong Han , Lee Young Chul 
Published: November 2010

AbstractIn this article, a novel design for the modified bow‐tie slot antenna with a rectangular tuning stub for 2.4/5.2/5.8 GHz triple‐band applications is presented. The prototype consists of a modified bow‐tie slot, the strip line in the bow‐tie slot, and the rectangular tuning stub for the feeding. The simulation results showed that the impedance matching of the proposed modified bow‐tie slot antenna was greatly affected by the feed gap and the strip line in the bow‐tie slot. The experiment results indicate that the impedance bandwidth (return loss: −10 dB definition) of the proposed antenna was about 1.405 GHz for the 2.4 GHz band and 1.305 GHz for the 5 GHz band. The radiation patterns and gains in the experiment results are also presented and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:126–130, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25647
Measurement of tag antenna by a time domain reflectmetry
Authors: Chang The Nan , Shie Wein 
Published: November 2010

AbstractIn this article, an RFID tag antenna etched on a grounded substrate is designed and tested. It takes two differentially connected photonic band gap elements. For each differential port, tag's reflection coefficient in frequency domain is transformed from two measured time domain waveforms. The first one as the input waveform is referred to an open‐circuited transmission line, whereas the second one as the response waveform is obtained by connecting one half of the tag at the end of each associated transmission line. As the TDR can provide differential signal, measurement of the tag's impedance becomes easy. Waveform in time domain is truncated according to Nicolson's ramping algorithm. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:90–93, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25649
Bandwidth enhancement of epsilon negative zeroth‐order resonator antennas using a Co2Y hexagonal ferrite helical loading
Authors: Ji Jeong Keun , Kim Gi Ho , Seong Won Mo 
Published: November 2010

AbstractA method to extend the bandwidth of epsilon negative (ENG) zeroth‐order resonator (ZOR) antennas using a Co2Y hexagonal ferrite (Ba2Co1Zn0.7Cu0.3Fe12O22) is presented.It is accomplished by using the ferrite helical loading for shunt inductance of ENG ZOR unit cell. The Co2Y hexagonal ferrite has been developed for performance improvement of mobile handset antennas. The permittivity of the developed Co2Y hexagonal ferrite is about 9.3, and the permeability is about 4. An ENG ZOR antenna based on simplified planar mushroom structure unit cell was fabricated, and bandwidth enhancement and good radiation performance were achieved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:87–90, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25650
Construction of 2D training database based on high‐frequency RCS prediction methods
Authors: Park Sang‐Hong , Jung Joo‐Ho , Kim Hyo‐Tae , Kim Kyung‐Tae 
Published: November 2010

AbstractFor automatic target recognition using inverse synthetic aperture radar images, training data used have been mostly obtained from measured targets.However, because of cost and secrecy, securing an actual enemy aircraft is very difficult. In this article, to determine whether this problem can be solved using computer simulation, we constructed a training database using three high‐frequency radar cross‐section prediction methods: physical optics (PO), physical theory of diffraction (PTD), and shooting and bouncing ray (SBR). Then, we used the polar mapping classifier to quantify their accuracy in classifying images. The combinations of SBR with PTD and PO with PTD had almost the same accuracy and both were more accurate than when SBR and PO were used alone. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:223–229, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25652
Average power handling capability of thin‐film microstrip line under dc‐bias conditions
Authors: Wu Hung‐Wei , Weng Min‐Hang 
Published: November 2010

AbstractAverage power handling capability (APHC) of the thin‐film microstrip line (TFML) under dc‐bias conditions (<1 V) is proposed for the first time. The TFMLs with a 20‐μm‐thick polyimide thin films are fabricated on a low‐resistivity silicon substrate (ρ ≤ 10 Ω cm). Losses and APHC are extracted from the measured S‐parameters up to 50 GHz. This study has also been studied on the different roughness and thermal conductivity of the polyimide film to evaluate the APHC of the dc‐biased TFML. It is believed that the evaluations are useful for the high‐dense microwave monolithic integrated circuits. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:84–87, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25653
A compact metamaterial‐inspired multilayered slot antenna
Authors: Zhang Hualiang , Xin Hao , Bortolin Robert , Kudva Jayanth 
Published: November 2010

AbstractA low‐profile, compact and easily integrated antenna for RF/microwave applications is presented in this article. The designed antenna works around 430 MHz and can be easily scaled to other frequencies. Metamaterial‐inspired slot loop antennas are used as the radiating elements. To shrink the total size of the antenna, periodical structures are loaded to the original slot loop. It is found that with this modification, the total size of the antenna is reduced and the impedance matching of the antenna is improved. To further improve the performance of the proposed antenna, a floating ground plane and a parasitic slot were added, made possible by the multilayered structure of the antenna. As a result, the bandwidth and gain of proposed antenna are increased. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:219–223, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25654
Dipole antenna with integrated balun for ultra‐wideband radio 6–9 GHz
Authors: Karlsson Magnus , Owais Owais , Östh Joakim , Serban Adriana , Gong Shaofang , Jobs Magnus , Grudén Mathias 
Published: November 2010

AbstractA fully integrated dipole antenna with a balun for ultra‐wideband (UWB) radio in the band 6–9 GHz utilizing a flexible and rigid printed circuit board is presented in this article. The balun utilizes broadside‐coupled microstrips and is integrated in the rigid part of the printed circuit board, whereas the radiator is placed in the flexible part. The antenna with the balun covers the frequency‐band 6.0–8.5 GHz at voltage standing wave ratio (VSWR) < 2.0, and 5.5–11.0 GHz at VSWR < 2.5. Moreover, simulated and measured radiation patterns and antenna efficiency above 86.0% are observed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:180–184, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25656
Modified Chebyshev bandstop filter with transmission zeros at real frequencies
Authors: Malherbe Johannes A. G. , Swiatko Adam 
Published: November 2010

AbstractThe logarithmic periodic transmission line filter has been shown to be an attractive alternative to elliptic function filters when a high rate of cutoff is needed.In this article, it is shown that an improved passband and bandedge response can be obtained if impedances obtained from a Chebyshev prototype are used, and the stopband width increased by shifting the resonant frequencies of the stubs away from the centre frequency in a non‐periodic fashion. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:177–180, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25657
Empirical and deterministic approach for the optimization of wideband RF power amplifiers' behavior modeling and predistortion structure
Authors: Fares Marie‐Claude , Boumaiza Slim , Wood John 
Published: November 2010

AbstractThis article presents an approach to determining the smallest number of coefficients of a Parallel Hammerstein (PH) model to reduce the development complexity of wideband RF power amplifiers' (PA) modeling and predistortion schemes. The visualization of the impulse responses of the different filters of the PH yields a systematic and single‐iteration approach for determining the optimal modeling structure, for example, filters' lengths. The approach was used to determine an optimal structure that linearizes the response of a 400‐watt LDMOS Doherty PA driven with a four carrier WCDMA signal. In the experiments conducted, the number of coefficients in the PH was reduced by about a factor of 2.5 without compromising its modeling and linearization performance. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:116–118, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25660
Miniaturization of rectangular microstrip patch antenna using optimized single‐slotted ground plane
Authors: Sarkar S. , Majumdar A. Das , Mondal S. , Biswas S. , Sarkar D. , Sarkar P. P. 
Published: November 2010

AbstractIn this article, a new design for single‐layer rectangular microstrip patch antenna has been proposed.This design uses a ground plane with a single slot. It has been shown that by using this slotted ground plane, the resonant frequency has been lowered considerably, thus, reducing the size of the antenna. Using this design, the size of the antenna is reduced by about 90%. It has been also shown that the resonant frequency can be reduced further by increasing the length of the slot. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:111–115, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25661
Small‐meandered coplanar antenna in UHF bands
Authors: Boucher S. , Sharaiha A. 
Published: November 2010

AbstractA low profile, electrically small coplanar antenna with omnidirectionnal radiation is presented. The antenna is less than λ0/400 in height and λ0/14 in lateral dimension. It is matched to 50 Ω without the need for external matching. The antenna's geometry and concept design using short‐circuiting and line‐meandering techniques are presented in this article. Simulated and measured return losses are also provided here, as well as efficiency and radiation patterns. The measurements verify that the fabricated antenna, which is proposed for its terminal (110 mm × 73 mm) features an excellent impedance match, gain, and omnidirectional radiation in a large bandwidth (10%). © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:72–77, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25663
Antenna covering GSM/PCN/bluetooth and GPS bands
Authors: Chang The‐Nan , Chuang Yu‐Chou 
Published: November 2010

AbstractIn this article, design and implementation of a monopole antenna covering GSM/PCN/Bluetooth and GPS bands are demonstrated. The antenna is modified from a symmetrical self‐complementary strip‐slot structure. However, one arm of the U‐shaped slot on the ground plane is extended to the rim of the printed circuit board. It is investigated that this extension makes the antenna well matched at a wideband. Without this extension, the antenna can only be worked at three separated narrow bands. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:34–40, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25664
Ultrawideband microstrip integrated‐antenna‐filter
Authors: Lim Eng Hock , Leung Kwok Wa 
Published: November 2010

AbstractA new three‐port integrated‐antenna‐filter (IAF) module is proposed for ultrawideband applications.The IAF is designed by closely packing a slot antenna and a patch filter on a single substrate. The reflection coefficient, mutual coupling, input impedance, radiation pattern, and insertion loss of the proposed configuration are studied. Since it was found that the mutual coupling between antenna and filter parts of the IAF is very small across a very wide bandwidth, the two parts can be designed almost independently. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:32–34, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25665
A 2.76‐mW, 3‐ to 10‐GHz ultrawideband LNA using 0.18‐μm CMOS technology
Authors: Chang Jin‐Fa , Lin Yo‐Sheng 
Published: November 2010

AbstractA low‐power (2.76 mW) common‐gate (CG) low‐noise amplifier (LNA) for ultrawideband (UWB) systems using standard 0.18 μm CMOS technology is demonstrated.Instead of the traditional single parallel inductor (LS1 only), we propose a new matching network consisting of a series LS1–RS1 in series with a parallel LS2–RS2 to enhance the input matching bandwidth. Flat and high S21 was achieved by using the connecting inductor LC and the peaking inductor LD2 to compensate the gain loss at medium frequency and high frequency, respectively. In addition, for suitable values of LC and LD2, flat and low noise figure (NF; i.e., a nearly critically damped Q‐factor for the second‐order NF frequency response) can also be achieved. Over the 3–10 GHz band of interest, the LNA achieved S21 of 10.1 ± 1.7 dB, minimum NF of 3.9 dB (at 4 GHz) and an average NF of 4.6 dB. The power dissipation was 2.76 mW, and the corresponding figure of merit was 4.3. Both are of the best results ever reported for a CMOS UWB LNA. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:94–97, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25667
A bioinspired microstrip antennas based on the idea of a cockroach antenna
Authors: Mahmoud Mahmoud N. , Elkamchouchi H. 
Published: November 2010

AbstractInsects possess garden variety of traits, but for some who lack the ability of vision, their species would have been extinct long ago. Through ingenuity of creation, these species adapted to the environment by developing antennas where they can use the basic principles of wave propagation to feel the surrounding objects. In this article, a new design for broadband microstrip antennas was investigated. The main aim is to make the patch like a cockroach antenna. The antenna has shown to yield percentage bandwidth about 120% for a substrate with permittivity of 4.5. For using air substrate, the antenna was fabricated, and the percentage bandwidth was 42%. Furthermore, some modifications were made to increase the bandwidth of air substrate antennas until it successfully reached 114%. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:135–139, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25668
Broadband printed dipole with integrated via‐hole balun for WiMAX applications
Authors: Ávila‐Navarro E. , Antón J. , Blanes José M. , Reig C. 
Published: November 2010

AbstractA broadband balanced printed dipole antenna for WiMAX applications (2.5/3.6 GHz) is presented. An integrated via‐hole balun is used to feed the antenna and a Yagi‐like scheme is proposed to improve the gain. The design has been optimized by means of parametric FDTD simulations. The antenna was fabricated and measured, giving a bandwidth higher than 50% and a gain higher than 4 dBi. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:52–55, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25671
Dual‐band ferrite chip antenna for global positioning system and bluetooth applications
Authors: Bae Seok , Hong Yang Ki , Lee Jae Jin , Park Ji Hoodn , Jalli Jeevan , Abo Gavin S. , Seong Won Mo , Park Sang Hoon , Kum Juk Sik , Ahn Won Ki , Kim Gi Ho 
Published: November 2010

AbstractDual‐band ferrite chip antenna having 105 mm3 of volume was fabricated with Ba3Co2Fe24O41(Co2Z)‐glass composite and antenna performance was evaluated. The permeability and permittivity of the composite were in the range of 1.92–2.12 and 7.33–7.45, respectively, from 1.575 to 2.45 GHz. Magnetic and dielectric loss tan δ of Co2Z‐glass composite was <3.5% in the 1.5–3.0 GHz range. The 3D average gain and bandwidth of the 40h‐shake‐milled and sintered Co2Z‐glass composite antenna were −1.27 dB and 355 MHz at 1.575 GHz, −4.08 dB and 270 MHz at 2.45 GHz, respectively. Simulated S‐parameter spectrum is in good agreement with experimental results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:14–17, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25672
A highly compact semielliptic shape ultrawideband monopole antenna
Authors: Naser‐Moghadasi M. , Rousta H. , Virdee B. S. 
Published: November 2010

AbstractThis article describes a compact microstrip‐fed planar monopole antenna, which comprises of a semielliptic shape radiation element on a partially modified ground‐plane. This antenna is different from the traditional monopole antenna as its ground‐plane is arc‐shaped near the vicinity of the radiating element, and it embodies two square slots disposed on either sides of the feed‐line. The modifications implemented to the ground‐plane improve the antenna's input impedance bandwidth and its radiation performance across the ultrawideband (UWB) frequency range. The resulting antenna prototype exhibits a return‐loss lower than 10 dB between 3.1–11.5 GHz, and a radiation pattern that is comparable with the traditional monopole antenna. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:229–231, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25674
High selectivity miniaturized broadband filter
Authors: Packiaraj D. , Vinoy K.J. , Ramesh M. , Kalghatgi A. T. 
Published: November 2010

AbstractDesign of a compact broadband filter using tightly coupled line sections in defected (A slot is cut in the ground) microstrip medium operating from 3.1–6.8 GHz has been reported in this article. Filter has been designed and analyzed using an equivalent circuit model based on even and odd mode parameters of coupled line sections. The proposed filter has attenuation poles on either side of the pass band resulting in improved selectivity. This filter features spurious‐free response up to third harmonic frequency. Experimental results of the filter have been validated against the analytical and full wave simulations. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:184–187, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25676