bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation on compact modified wideband interdigital bandpass filter with wide stopband using spurlines and defected ground structures
Authors: Sahu Bhagirath , Tripathi Pankaj , Singh Soni , Kumar Meshram Manoj , Singh S. P. 
Published: August 2016

ABSTRACTIn this paper, a compact modified microstrip interdigital bandpass filter (IBPF) having two pairs of spurlines and a pair of defected ground structures (DGS) containing stepped impedance resonators (SIRs) is described for L–Band receiver applications. A combination of spurlines and SIR‐shaped DGS is used to obtain the proposed compact IBPF with wide stop‐ and pass‐bands. The reduction in size and wide stopband characteristic of the filter result from band notched characteristic of spurline, and harmonic suppression along with miniaturization characteristic of DGS. The equivalent circuit parameters of the spurlines and DGS are also extracted and their values are computed. The proposed compact filter is of size 0.24λg × 0.34λg (0.107λ0 × 0.075λ0), where
, λ0 is the free space wavelength at the centre frequency (f0) of 1.47 GHz and
(=10.2) is the dielectric constant of the substrate. The simulated and measured 3‐dB fractional bandwidths of the proposed filter are 80% (over the frequency range 0.89 −2.05 GHz) and 79% (over the frequency range 0.87–2.01 GHz) respectively. The proposed BPF has stopband attenuation better than 17 dB upto a frequency of approximately six times the centre frequency of the desired passband. For the validation of the simulated results, the prototype of the proposed filter was fabricated and its parameters like S–parameters, group delay and phase responses were measured. The experimental results for the proposed BPF are nearly in agreement with the respective simulation results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2634–2639, 2016
Dual‐band in‐/anti‐phase filtering power dividers
Authors: Qin W. , Chen J.‐X. , Zhou L.‐H. , Bao Z.‐H. , Xue Q. 
Published: August 2016

ABSTRACTThis article presents a novel dual‐band in‐/anti‐phase filtering power divider. The signals of the two output ports are symmetrically extracted from the resonator. Naturally, they are in‐phase for even‐mode passband but anti‐phase for the odd‐mode passband. The intrinsic reason is that a negative group delay (NGD) frequency band is presented between the two passbands, which opens a window for the change of the 180º phase differences. For demonstration, a dual‐band filtering power divider is designed and measured based on the stub‐loaded resonators (SLRs). Good agreements are observed between the measured and simulated results, showcasing small magnitude and phase differences in both passbands. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2626–2629, 2016
Quad‐element multi‐band antenna array in the smart mobile phone for LTE MIMO operations
Authors: Li Ke , Shi Yan , Liang Chang‐Hong 
Published: August 2016

ABSTRACTIn this paper, a quad‐element MIMO antenna array in the smart phone has been developed for multi‐wideband operations covering 750–960 MHz and 1700–3600 MHz. The proposed antenna element consists of two parts: one is a dielectric resonator that operates in a TE11δ mode and generates the antenna's upper band, and the other is a radiating patch with a meander line connected to the ground plane, which achieves composite right‐ and left‐handed (CRLH) metamaterial transmission lines structure and contributes the antenna's lower band. Each of four antenna elements fitting in a small region of 25 × 16 × 4 mm3 are located on a circuit board of 125 × 75 × 0.8 mm3. The slots are etched on the metallic ground plane to guarantee good isolation between four antenna elements. The MIMO antenna array is fabricated, and the simulated and measured results show good performance in terms of S parameters, radiation pattern, total efficiency, and envelope correlation coefficient (ECC). © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2619–2626, 2016
A remotely interrogated near‐field sensor for sub‐λ microwave imaging
Authors: Mostafavi Mahkamehossadat , Horvath Niccolo , Flores Matthew , Mistry Neel , Stephanie Smekal Michelle , Enrique Diaz Rodolfo 
Published: August 2016

ABSTRACTA wideband surface‐scanning near‐field sensor in the form of a slot antenna, remotely interrogated by a wireless signal is reported. Perturbation of the antenna near‐field by subwavelength objects (λ/10) on the surface is detected in the far‐field as a change in the antenna signature, yielding image of the surface structure. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2677–2682, 2016
Miniaturized rat‐race coupler with tunable power dividing ratio based on open‐ and short‐circuited transdirectional coupled lines
Authors: Wang Zhongbao , Cao Yuan , Fang Shaojun , Liu Yuanan 
Published: August 2016

ABSTRACTA miniaturized rat‐race coupler with a tunable power dividing ratio is proposed by using the open‐ and short‐circuited transdirectional coupled lines, design equations of which are derived to obtain perfect matching and isolation regardless of the coupling power. Based on the design equations, a microstrip rat‐race coupler with circuit size of λg/4 × λg/31 is implemented. Simulated and measured results are given to verify the proposed method. Compared with the existing tunable rat‐race coupler, the proposed coupler has 40–71% reduction of circuit size and a wide adjustable range of power‐dividing ratios (−10–13 dB) with a control voltage ranging from 3 to 12 V. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2683–2689, 2016
A novel three dimensional vector finite element method for periodic photonic devices
Authors: Gonçalves Marcos S. , Isayama Yuri H. , Hernández‐Figueroa Hugo E. 
Published: August 2016

ABSTRACTThis article presents a novel Three‐Dimensional (3D) Vector Finite Element Method to solve eigenvalue problems for periodic structures. With the formulation, numerical investigations of photonic crystals and subwavelength grating waveguide in a silicon‐on‐insulator platform have been performed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2665–2668, 2016
Research on target tracking capture rate calculation and target optical characteristic in target optical imaging tracking system
Authors: Lu Liping , Wang Jinfang 
Published: August 2016

ABSTRACTBased on the instability problem of target tracking performance in the optical tracking imaging system of field operations, this article researches the target tracking capture rate. The target tracking platform is established with target imaging radiation characteristics and target movement features and target optical properties are researched with photometry knowledge. According to target detection range, target size, environmental illumination and area array CCD imaging characteristics, the calculation model of target tracking capture rate is deduced and the factors that affecting the target capture rate are analyzed. By calculation and experimental analysis, the target capture rate decreases when the detection range increases and the target capture rate increases when the target size is larger. The target gray value is relatively stable when the weather is sunny and target images captured by CCD are given when the target size is
. The optical imaging system can work day and night and the target capture rate can get 95% with the laser strobe auxiliary illumination technology. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2672–2677, 2016
Dual polarized dual‐band MIMO antenna
Authors: Sharma Rekha , Kiran Kommuri Usha 
Published: August 2016

ABSTRACTFor multiple‐input‐multiple‐output (MIMO) system a dual‐band dual‐polarized antenna is presented. The antenna which is presented in this thesis produces a linearly polarized and circularly polarized radiation fields. The measured return losses of −18.89 and −21.86 dB are achieved at 2.43 GHz and 3.22 GHz, respectively. In this the proposed antenna is designed and simulated using Ansoft HFSS Software. The result shows that the gain of the antenna has increased by 1.4dB and 1.2dB at 2.43 and 3.22 GHz, respectively by using the FSS. A compact dual‐band dual‐polarized antenna is achieved. The proposed antenna is fabricated and validated experimentally using VNA. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2699–2703, 2016
Cylindrical near‐field antenna measurement using a polarization reconfiurable probe
Authors: Row Jeen‐Sheen , Tsai Jia‐Fu 
Published: August 2016

ABSTRACTA cylindrical near‐field antenna measurement using a probe with switchable polarization is described. The probe is a dual‐feed crossed‐dipole antenna with wideband operation, and its polarization can be switched between dual orthogonal linear polarizations by selecting one feed as the signal input port. The system layout for the proposed near‐field antenna measurement is shown. Two S‐band antennas, including a standard gain horn and a 1 × 8 planar array, are respectively selected as the antenna under test, and the radiation patterns obtained from the constructed near‐field measurement system have good agreements with the simulated results. In addition, the use of the polarization reconfigurable probe can eliminate the need of rotating the probe by 90°, and consequently the test time is obviously reduced. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2707–2711, 2016
Reducing mutual coupling in chipless rfid tags composed of U‐folded dipole scatterers
Authors: Machac Jan , Polivka Milan , Svanda Milan , Havlicek Jaroslav 
Published: August 2016

ABSTRACTWe propose a novel chipless RFID tag composed of topologically modified uniplanar U‐folded dipoles with inclined arms. This topology reduces the interelement mutual coupling and provides a significantly better amplitude uniformity and frequency stability of tag RCS response when logical “0” is coded by removing particular scatterers from the array. Simultaneously, it provides a higher encoding capacity in unit frequency range than the arrays composed of original U‐folded dipoles with parallel arms, yet at the expense of small RCS magnitude reduction.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2723–2725, 2016
Reactive impedance surface based multisystem satellite navigation antenna
Authors: Li Xue‐Shi , Xu Kai‐Da , Xu Yuan‐Mei 
Published: August 2016

ABSTRACTA reactive impedance surface (RIS) based novel antenna that covers operating bands of multiple global navigation satellite systems (GNSSs) is presented. By using the metamaterial covering layer, that is, the RIS, the antenna achieves wideband performance in terms of both reflection coefficient and axial ratio (AR). For reflection coefficient lower than −10 dB, the operating band is 1.26–1.73 GHz. The AR bandwidth of the antenna that is lower than 3 dB is 1.33 GHz–1.71 GHz, enabling it compatible with several GNSSs including GPS, GLONASS, Beidou, and Galileo. In addition, the antenna radiates an axial beam with a peak gain of 6.0 dBic in the form of the right‐handed circular polarization. The antenna has a favorable peak radiation efficiency of 93.3% in the operating band while keeping a compact size of 0.38 λ0 × 0.38 λ0 × 0.097 λ0 at 1.33 GHz.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2764–2769, 2016
Miniaturized band‐notched ultra‐wideband antenna
Authors: Ding Wen , Wang Gaofeng 
Published: August 2016

ABSTRACTA miniaturized band‐notched ultra‐wideband antenna with a bandwidth from 2.7 to 13.1 GHz (i.e., bandwidth ratio 4.9:1) for VSWR ≤ 2 and a stop band from 5 to 6 GHz is designed and optimized. The overall area is reduced by 30% and a radiation rejection band is engineered by inserting a 1/2 wavelength thin strip dipole to serve as an anti‐resonator in the undesired band where the radiated field from the radiator is phase‐reversed with respect to that from the inserted anti‐resonator, consequently the total radiation is cancelled out, and the stop band can be easily tuned by adjusting the dipole length and width. It is shown that this antenna is robust in rejecting environmental interferences. A prototype of this antenna is fabricated and measured. The measurements agree well with the simulation results.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2780–2786, 2016
A novel dual wideband circular quasi‐yagi MIMO antenna system with loop excitation
Authors: Jehangir Syed S. , Sharawi Mohammad S. 
Published: August 2016

ABSTRACTA 4‐element circular quasi‐Yagi based multiple‐input‐multiple‐output (MIMO) antenna system with loop excitation is presented. This wide dual‐band antenna system covers 1.45–2.55 GHz and 3.707− 4.71 GHz bands covering GPS, GSM/EDGE, UMTS/HSDPA, Bluetooth, Wi‐Fi and WiMAX bands. This antenna has an end‐fire directional radiation pattern with front‐to‐back ratio (FBR) of 13.8 dB, minimum measured gain of 5.8 dBi and directivity of 7 dB at 2 GHz using one director element. The minimum measured efficiency across the two bands was 65%. The proposed antenna ensured good MIMO performance in terms of isolation and correlation. It has a minimum measured isolation of 18 dB across both bands. Due to its geometry configuration, pattern orthogonality is obtained which gives very low envelope correlation coefficient values not exceeding 0.1589 in both bands. The size of the MIMO antenna system is 263 × 263 mm2 thus making it suitable for wireless access points and on vehicle applications.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2769–2774, 2016
Photonic frequency up‐conversion of baseband pulses for IR‐UWB using optical beating and balanced coherent detection
Authors: Joel Santos‐Aguilar , Arturo Arvizu‐Mondragón , Celso Gutiérrez‐Martínez 
Published: August 2016

ABSTRACTThis article describes a photonic scheme that performs frequency up‐conversion of baseband pulses for potential applications on Impulse Radio‐Ultra Wideband systems. Mixing a laser modulated by a pulse with a wavelength‐tunable laser (local oscillator) and a coherent photodetection scheme we obtain high order pulses comparable with nth derivatives of a Gaussian pulse. With our approach is possible to perform the frequency translation of the baseband pulses so that UWB pulses within standardized UWB mask are obtained. Baseband components produced in the optical mixing are removed by using a balanced photodetection stage. Our scheme exploits two different microwave photonics technics (microwave generation and coherent detection) for accomplish a simple generator of high order pulses avoiding the use of complex schemes. Additionally, the scheme can be implemented with commercially available components and it is reconfigurable in a very simple way. The performance of the proposed scheme is analyzed and evaluated in this work.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2749–2755, 2016
A decagon shaped universal compact broadband printed monopole antenna
Authors: Ahirwar Divya , Shrivastava Apoorva , Baudha Sudeep 
Published: August 2016

ABSTRACTIn this article, a decagon shaped universal compact broadband printed monopole antenna has been described which consists of a decagon shaped patch and a valley shaped notch in the partial ground plane for multiple applications, operating at frequency ranges from 3.5 GHz to greater than 100 GHz. The overall dimension of the proposed antenna is 15*20*1.5 cubic millimeter and is fabricated on commercially available low cost FR4 substrate having electrical permittivity (εr) of 4.3 and loss tangent of 0.025. The proposed antenna has some of the range for ultra‐wide band applications, Wi‐Fi, 3.5/5.5GHz WiMAX band, 5.2/5.8GHz WLAN band, 60/90 GHz E‐band military applications, 8/12 GHz X‐band, 12/18 GHz Ku ‐band, 26.5/40 GHz Ka‐band, 40/60 GHz U‐band, 50/75 GHz V‐band, 75/110 GHz W‐band,space and satellite communications etc. The impedance bandwidth (S‐parameter < 10 dB) is more than 188%, radiation efficiency is 78% and the peak gain is 7.6 dB. The simulated return losses, impedance curves, radiation efficiency, gain, surface current and radiation patterns of the proposed antenna are elaborated in this paper.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2760–2764, 2016
Compact beamforming antenna with multiple radiation pattern reconfigurations
Authors: Ji Jeong Keun 
Published: August 2016

ABSTRACTA compact beamforming antenna with multiple radiation pattern reconfigurations is presented for 2.4 GHz wireless MIMO applications. The proposed antenna comprises four pairs of active elements and parasitic elements loaded PIN diodes. The size of the antenna is 0.144λ0 × 0.144λ0 × 0.8λ0, indicating a very compact design. By switching PIN diodes, the parasitic element performs as a director or a reflector, and the impedance matching and the radiation patterns of the antenna are optimized. The performance of the antenna is verified by experimental data obtained from fabrication and measurement. The antenna offers three modes with nine radiation beam patterns at the frequencies of 2.4 GHz band. The measured peak gain of all beam patterns ranges from 4.1 to 6.9 dBi.© 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2755–2760, 2016
Cavity ring‐down technique for remote sensing
Authors: Silva S. , Marques M.B. , Frazão O. 
Published: August 2016

ABSTRACTThis work demonstrates the viability of using a cavity ring‐down (CRD) technique for remote sensing. A conventional CRD configuration is used where an optical circulator is added inside the fiber loop to couple 19 km of optical fiber with a gold mirror at its end with the purpose of remote sensing. As a proof‐of‐concept, an intensity sensor based on an eight‐figure configuration is used at the end of the 19 km of fiber for displacement sensing. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2711–2713, 2016
Fibrosis, low vascularity, and fewer slow fibers after rotator‐cuff injury
Authors: Gigliotti Deanna , Xu Mark C. , Davidson Michael J. , Macdonald Peter B. , Leiter Jeff R.S. , Anderson Judy E. 
Published: August 2016

ABSTRACTIntroductionRotator‐cuff injury (RCI) represents 50% of shoulder injuries, and prevalence increases with age. Even with successful tendon repair, muscle and joint function may not return.MethodsTo explore the dysfunction, supraspinatus and ipsilateral deltoid (control) muscles were biopsied during arthroscopic RCI repair for pair‐wise histological and protein‐expression studies.ResultsSupraspinatus showed fiber atrophy (P <  0.0001), fibrosis (by Sirius Red, P = 0.05), reduced vascular density (P <  0.001), and a lower proportion of slow fibers (P <  0.0001) compared with the ipsilateral control muscle. There were also higher levels of atrogin‐1 (P = 0.05), vascular endothelial growth factor (VEGF, P <  0.01), and dystrophin (P <  0.008, relative to fiber diameter) versus control.ConclusionsAdaptive changes in vascular endothelial growth factor and dystrophin were likely associated with reduced vascular supply, fatigue resistance, and fibrosis, accompanied by disuse atrophy from mechanical unloading of supraspinatus after tendon tear. Treatment to promote growth and vascularity in atrophic supraspinatus muscle may help improve functional outcome after surgical repair. Muscle Nerve 55: 715–726, 2017
Inter‐rater reliability determination for two tests of ulnar nerve conduction across the elbow
Authors: Carroll Craig G. , Landau Mark E. , Rouhanian Minoo , Campbell William W. 
Published: August 2016

ABSTRACTIntroductionThe inter‐rater variability in determination of ulnar nerve conduction across the elbow compromises test accuracy. The extent of this variability is unknown. The objective of this study was to determine and compare inter‐rater reliability of variables derived from 2 different ulnar nerve conduction studies (NCSs) across the elbow.MethodsTwo investigators performed a standard ulnar NCS and a 6‐cm conduction time (Six‐Centimeter Conduction Time test, SCCT) on 60 extremities of asymptomatic subjects. In the standard test, below‐elbow (BE) and above‐elbow (AE) stimulation points were ≥ 10 cm apart, measured along a curved path, to calculate across‐elbow NCV. In SCCT, BE and AE were precisely 6 cm apart measured linearly to calculate CTE (conduction time elbow). Inter‐rater reliability was assessed by means of intraclass correlation coefficients (ICC).ResultsICC for across‐elbow NCV and CTE were 0.726 and 0.801, respectively.ConclusionsReliability of CTE and across‐elbow NCV are similar. Shorter distances, if measured linearly, can be used to determine across‐elbow ulnar nerve conduction. Muscle Nerve 55: 664–668, 2017
Low adoption of weight loss medications: A comparison of prescribing patterns of antiobesity pharmacotherapies and SGLT2s
Authors: Thomas Catherine E. , Mauer Elizabeth A. , Shukla Alpana P. , Rathi Samrat , Aronne Louis J. 
Published: August 2016

ObjectiveTo characterize the adoption of antiobesity pharmacotherapies, as compared with that of the newest antidiabetes pharmacotherapy, subtype 2 sodium‐glucose transport protein inhibitors (SGLT2s), among prescribers in the United States.MethodsA retrospective analysis of 2012 to 2015 data extracted from the IMS Health National Prescription Audit™ and Xponent™ assessed adoption rates of antiobesity pharmacotherapies and SGLT2s.ResultsThe number of dispensed antidiabetes prescriptions was 15 times the number of dispensed antiobesity prescriptions. The antiobesity market share was: 74.0% phentermine, 18.6% new antiobesity pharmacotherapies. The mean increase in prescriptions/month were: 25,259 for SGLT2s, 5,154 for new antiobesity pharmacotherapies, and 2,718 for phentermine. Medical specialties prescribing the majority of the analysis medications were Family Medicine/General Practice and Internal Medicine. Endocrinology had the highest prevalence of prescribers of any subspecialty.ConclusionsThe adoption rate of SGLT2s was nearly exponential, while the adoption rate of new antiobesity pharmacotherapies was linear. Considering the relative prevalence of obesity to diabetes and that obesity is a major cause of diabetes, these results are paradoxical and suggest systematic barriers against the prescribing of antiobesity pharmacotherapies. The under‐prescribing of antiobesity pharmacotherapies is widely acknowledged, but this is the first prescription data of these new medications to demonstrate its extent in the United States.
Insulin access to skeletal muscle is impaired during the early stages of diet‐induced obesity
Authors: Broussard Josiane L. , Castro Ana V.B. , Iyer Malini , Paszkiewicz Rebecca L. , Bediako Isaac Asare , Szczepaniak Lidia S. , Szczepaniak Edward W. , Bergman Richard N. , Kolka Cathryn M. 
Published: August 2016

ObjectiveInsulin must move from the blood to the interstitium to initiate signaling, yet access to the interstitium may be impaired in cases of insulin resistance, such as obesity. This study investigated whether consuming a short‐ and long‐term high‐fat diet (HFD) impairs insulin access to skeletal muscle, the major site of insulin‐mediated glucose uptake.MethodsMale mongrel dogs were divided into three groups consisting of control diet (n = 16), short‐term (n = 8), and long‐term HFD (n = 8). Insulin sensitivity was measured with intravenous glucose tolerance tests. A hyperinsulinemic euglycemic clamp was performed in each animal at the conclusion of the study. During the clamp, lymph fluid was measured as a representation of the interstitial space to assess insulin access to muscle.ResultsShort‐ and long‐term HFD induced obesity and reduced insulin sensitivity. Lymph insulin concentrations were approximately 50% of plasma insulin concentrations under control conditions. Long‐term HFD caused fasting plasma hyperinsulinemia; however, interstitial insulin concentrations were not increased, suggesting impaired insulin access to muscle.ConclusionsA HFD rapidly induces insulin resistance at the muscle and impairs insulin access under basal insulin concentrations. Hyperinsulinemia induced by a long‐term HFD may be a compensatory mechanism necessary to maintain healthy insulin levels in muscle interstitium.