bluuebunny/crossref_metadata_2025_split huggingface dataset:
A tunable triangular microstrip patch antenna for multiband applications
Authors: Lee K.‐M. , Sung Y.‐J. , Baik J.‐W. , Kim Y.‐S. 
Published: April 2009

AbstractA tunable triangular microstrip patch antenna is proposed for multiband applications in this letter. The proposed antenna consists of varactor diodes and F‐shaped slits. As the input impedance of the antenna can be varied by changing the bias voltage of the varactor diode on the F‐shaped slits, the resonant frequency may be changed. The designed antenna has return losses better than 20 dB within 1.95–2.16 GHz. The peak gains of the antenna present 2.87 and 3.1 dBi at the both ends of the above frequency range. Details of the antenna design are described. Its performances are also presented. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1788–1790, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24428
Internal multiband monopole antenna for wireless‐USB dongle application
Authors: Park Piljun , Choi Jaehoon 
Published: April 2009

AbstractAn internal multiband monopole antenna for application in a USB dongle is proposed. The antenna consists of two metal strips which are constructed of a dielectric substrate and have a volume of 20 mm × 10 mm × 1 mm. The multiband characteristic is obtained by using a folded meander strip on the top side of the substrate, and the wideband performance in the lower band is achieved by connecting an inverted L‐shaped stub to the ground. The measured bandwidths were 26.1% (1.7–2.9 GHz) in the lower band for the DCS‐1800, US‐PCS, WCDMA, WiMax, 2.4 GHz‐WLAN, and S‐DMB bands and 15.5% (5.05–5.9 GHz) in the upper band for the 5 GHz‐WLAN band. Nearly omnidirectional radiation patterns and reasonable antenna gains were obtained in the desired frequency bands. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1786–1788, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24429
Reconfigurable patch with switchable conductive edges
Authors: Haupt Randy L. 
Published: April 2009

AbstractThis article demonstrates the use of materials with variable conductivity on the edges of a rectangular patch antenna to change the resonant frequency. The dimensions of the patch and edge material are numerically optimized to create resonances at four microwave frequencies. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1757–1760, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24430
Compact dual‐frequency double T‐shaped slot antenna for RFID application
Authors: Zhang Li , Jiao Yong‐Chang , Song Kun , Zhang Fu‐Shun 
Published: April 2009

AbstractA novel compact double T‐shaped slot antenna is introduced to achieve a dual‐frequency for radio frequency identification (RFID) applications. The designed antenna with an overall dimension of only 33.5 × 12.5 mm2 is low in profile and can operate simultaneously at 2.45 and 5.8 GHz bands. Also, good omnidirectional radiation patterns have been obtained. Its properties make the antenna not only suitable for RFID tags but also for WLAN applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1755–1757, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24431
A miniature X‐band‐embedded multilayer band‐pass filter using LTCC technology
Authors: Wang Zhigang , Yan Bo , Xu Ruimin , Lin Weigan 
Published: April 2009

AbstractThis article proposes a miniature embedded multilayer interdigital bandpass filter (BPF) based on low temperature co‐fired ceramic (LTCC) technology, which is used to suppress fundamental and harmonic components of local‐oscillator signal in a LTCC transceiver module. A practical design methodology corresponding to LTCC multilayer configuration is described. A five‐order Chebyshev interdigital BPF is developed and verified by full‐wave simulation. The proposed filter is fabricated using multilayer LTCC technology and measured using vector network analyzer. Good agreement between simulated and measured response is observed. Covering area of the fabricated BPF is only 8.1 × 7.4 mm2 (including via fences). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1722–1725, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24432
Gilbert upconversion mixers using single‐band/dual‐band LC current combiners
Authors: Syu Jin‐Siang , Meng Chinchun , Yen Ying‐Chieh , Huang Guo‐Wei 
Published: April 2009

AbstractThe 0.35‐μm SiGe BiCMOS high linearity Gilbert upconverters are demonstrated in this article by utilizing NMOS and PMOS transconductance amplifiers (TCAs), respectively. To improve the linearity of a Gilbert upconverter, the IF input TCA is replaced by a bias‐offset differential pair. A reactive LC current combiner is used as the load of the Gilbert mixer to double the output current. The upconverter with an NMOS TCA achieves the conversion gain of −4 dB, the OP1dB of −11 dBm, and the OIP3 of 5.5 dBm, whereas the other one with a PMOS TCA has the conversion gain, OP1dB, and OIP3 of −6 dB, −11 dBm, and 9.5 dBm, respectively. Furthermore, the LC current combiner can be extended to a dual‐band version. The 2.4/5.7 GHz dual‐band upconverter is also demonstrated in this work. The conversion gain at 2.4/5.7 GHz is −3/−3.5 dB with the OP1dB of −15.5/−15 dBm and the OIP3 of −2.5/−3 dBm, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1718–1722, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24433
Optical fiber AC voltage sensor
Authors: Kim Soobong , Park Jaehee , Han Won‐Taek 
Published: April 2009

AbstractA fiber‐optic interferometric voltage sensor with a high‐sensitivity is investigated. The fiber‐optic voltage sensor is composed of an in‐line Michelson interferometer bonded to a piezoelectric transducer (PZT). The in‐line Michelson interferometer is a hollow optical fiber spliced to a single‐mode fiber at one end and cleaved at the other end. A phase shift in the sensor output signal is induced when applying an AC voltage to the PZT; and a higher‐amplitude voltage produces an output interference signal with a higher frequency. The relation between the amplitude of the applied voltage and the phase shift of the sensor output signal is found to be approximately linear and the slope of the relation graph is about 0.116 πradian/V. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1689–1691, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24434
A novel multilayered cross‐coupled substrate‐integrated waveguide (SIW) circular cavity filter in LTCC
Authors: Wei Qi‐Fu , Li Zheng‐Fan , Wu Lin‐Sheng , Li Lin 
Published: April 2009

AbstractA novel multilayered cross‐coupled substrate‐integrated waveguide (SIW) circular cavity filter is proposed in this letter. The filter is designed using standard low‐temperature co‐fired ceramic (LTCC) technology, with the fractional bandwidth of 0.25% obtained, can operate at 20 GHz and have two finite frequency transmission zeros at 19.51 and 20.51 GHz, respectively. Measured results show good agreement with simulated results and validate the structure of the proposed filter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1686–1689, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24435
Experimental demonstration of a clock recovery scheme utilizing nonlinear relaxation oscillation in directly modulated lasers
Authors: Yan Minhui , Chen Chih‐Hung , Xu Qing‐Yang , Huang Wei‐Ping 
Published: April 2009

AbstractAn experimental demonstration was presented for a clock recovery scheme suitable for low‐cost short‐haul optical communications. This scheme utilizes the nonlinear relaxation oscillation in a directly modulated laser, which creates clock information in modulated nonreturn‐to‐zero optical signals. At the receiver, an injection locked oscillator is employed to extract and restore the clock. Eye diagrams of both received data signal and recovered clock demonstrate the capability of recovering clock from the data signal with an almost closed eye at ∼9 Gbps. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1654–1657, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24436
Low‐profile dielectric resonator antenna with high‐permittivity for application in WiMAX
Authors: Chen Yih‐Chien , Chen Kai‐Hao 
Published: April 2009

AbstractIn this article, the measurement results of the dielectric resonator antenna with high‐permittivity have been presented. With this technique, a 5.4% bandwidth (return loss < −10 dB) of center frequency at about 3.5 GHz for application in WiMAX has successfully been achieved. The copolarization radiation is strongest at θ ≅ 5° from the broadside in the E‐plane. The cross‐polarized patterns are about 10 dB less than the copolarized patters in the broadside direction. The antenna has a 3 dB beam angle of about 80°. Peak antenna gain is about 5.96 dBi, with gain variations less than 1.0 dBi for frequencies within in the −10 dB S11 bandwidth. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1652–1654, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24437
A wideband circularly polarized microstrip antenna array with single feeding
Authors: Yao Ping , Yu Yang , Che Wenquan , Chen Wentao 
Published: April 2009

AbstractIn this article, one wideband circularly polarized microstrip antenna array has been proposed and investigated. The technique of sequential rotation subarray has been employed to construct the whole antenna array, which enhances the impedance bandwidth and axial ratio (AR) bandwidth by 54.65 and 220.93%, respectively, when compared with the traditional way of CP array formation. One 8 × 4 antenna array has been fabricated and measured, agreement can be observed between the experimental and simulation results, the measured VSWR bandwidth is 7.33%, the AR bandwidth is 4.31%, and the gain is about 19 dB. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1624–1627, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24438
Embedded dual fiber Bragg grating sensor for simultaneous measurement of temperature and load (strain) with enhanced sensitivity
Authors: Mondal Samir K. , Mishra Vandana , Tiwari Umesh , Poddar G. C. , Singh Nahar , Jain Subhash C. , Sarkar S. N. , Kapur Pawan 
Published: April 2009

AbstractAn embedded dual fiber Bragg gratings sensor for simultaneous measurement of temperature and load (strain) is proposed and experimentally demonstrated. Two nearly identical gratings are mounted on opposite side of an arch‐shaped steel strip. The grating in concave and convex position experiences equal blue and red shift, respectively, due to bending of the strip which is exploited in temperature and load (strain) discrimination. The temperature and load (strain) sensitivity of the sensor improves to 28.5 pm/°C and 2.8 pm/g (2.6 pm/με). The sensor can measure temperature and load (strain) accurately with small error of ±1°C and ±1 g, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1621–1624, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24439
Printed tri‐band monopole antenna structures for wireless applications
Authors: Gupta R. K. 
Published: April 2009

AbstractThis article proposes a novel tri‐band printed monopole antenna structure for wireless applications in GSM, DCS, and wireless local area network applications, IEEE 802.11 industrial, scientific, and medical (ISM) band. The proposed antenna consists of a rectangular patch monopole printed antenna in which a slot is cut, and dual‐band E‐shape patch is placed. The three arms in monopole antenna generates three resonate frequencies to cover 890–960 MHz GSM band, 1710–1880 MHz DCS band, and 2.4–2.5 GHz ISM band. Slots are removed to coincide with central arm to obtain the second structure. Central arm of antenna resonate at GSM, whereas the other two side arms resonate at DCS and ISM band; therefore three bands can be optimized easily. The proposed antennas can easily be fed by using a 50 Ω probe feed. The simulated VSWR is <2 over 890–960 MHz, 1710–1880 MHz, and 2.4–2.5 GHz The radiation patterns indicate the suitability of these antennas for wireless applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1781–1785, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24440
A 0.18 μm 3.1–4.8 GHz CMOS wideband single to differential LNA for UWB system
Authors: Jeong Moo I. , Lee Jung S. , Myung No C. , Kim Jong M. , Lee Chang S. 
Published: April 2009

AbstractWe have proposed a 3.1–4.8 GHz CMOS wideband single to differential low noise amplifier (LNA) for ultra wideband system. The LNA is fabricated with the 0.18 μm 1P6M standard CMOS process. Measurement of the CMOS LNA was performed using RF probe station. From 3.1 to 4.8 GHz, the wideband LNA exhibits a noise figure of 4.8–5.1 dB, a gain of 12.6–15.3 dB, and an input return loss higher than 10 dB. The input IP3 (IIP3) at 4.1 GHz is −19 dBm, and consumes 19.1 mW of power. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1778–1781, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24441
Efficient method for resonant frequency computation of rectangular dielectric resonator antennas
Authors: Gürel Çiğdem Seçkin , Coşar Hayriye 
Published: April 2009

AbstractIn this study, a new and simple formulation is presented for a rectangular dielectric resonator antenna and called as efficient dielectric waveguide model. The results obtained are compared with that of the previous studies and experimental values. It is shown that considerable improvement is achieved over the previous theories within very small percentage errors for almost all cases. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1706–1708, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24442
Application of “bull's eye” corrugated grooves integrated with artificially soft surfaces structure in the patch antenna to improve radiation performance
Authors: Huang Cheng , Zhao Zeyu , Luo Xiangang 
Published: April 2009

AbstractIn this article, a Bull's eye corrugated structure integrated with artificially soft surfaces structure is proposed as the ground plane in the patch antenna. This structure is based on the modulation of surface wave by the bull's eye corrugated structure and the suppression of surplus surface wave at grounded edge by artificially soft surfaces structure. A numerical investigation for the patch antenna surrounded with combined corrugated grooves ground is presented using finite difference time domain method. The gain of the patch antenna is significantly improved by 12.3 dB, and half power beamwidth in the E and H‐plane are dramatically suppressed. The backward radiation is also reduced by 10 dB, which greatly enhances the Front to Backward (F/B) radiation ratio. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1676–1679, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24443
Controlled multiple resonances behavior of asymmetric L‐shaped CPW DGS
Authors: Jiang Hu 
Published: April 2009

AbstractThis article presents an asymmetric L‐shaped coplanar waveguide defected ground structure (DGS). Three asymmetry cases, the transverse, the vertical, and two‐dimensional asymmetries, have been studied under changing the certain dimension parameter. Controlled multiple resonance frequencies with different attenuation level can be observed, when the asymmetry degree is being adjusted. Characteristics of these asymmetric DGSs are modeled by multiple parallel RLC resonance circuits connected with T‐networks. This flexible multiple band‐rejections property is useful to suppress multiple harmonics selectively in small‐sized circuits. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1671–1676, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24444
Elimination of the dependency of the calibration plane and the sample thickness from complex permittivity measurements of thin materials
Authors: Hasar U. C. , Inan O. E. 
Published: April 2009

AbstractIn nonresonant broadband measurements, thin samples do not fill the entire sample holder (a waveguide or coaxial‐line section). In this circumstance, the measured scattering parameters have to be transformed from the calibration plane to the sample end surfaces. Furthermore, it is always attractive to measure the complex permittivity of materials with no prior information of their thickness. This article proposes a simple but powerful method to eliminate the dependency of both the calibration plane and the sample thickness on permittivity measurements of thin nondispersive materials. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1642–1646, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24445
Printed double‐T monopole antennas for triband applications
Authors: Kshetrimayum Rakhesh Singh 
Published: April 2009

AbstractIn this article, we have investigated printed double‐T monopole antennas for triband applications. A close form formula for calculating the antenna resonance frequency is reported. Such printed monopole antennas are compact, less fragile, planar, and easy for design and fabrication. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1640–1642, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24446
SMT pad using a coaxial line structure for LTCC SoP applications
Authors: Lee Young Chul 
Published: April 2009

AbstractIn this work, a SMT (surface mount type) pad using a coaxial‐line‐like vertical via transition is presented for LTCC SoP (system‐on‐package) applications. Because the outer conductors of the coaxial‐like transition overlaps with the CPW line on the PCB board, the overlap part is cut off to eliminate the their interaction or crosstalk. For reduction of radiation and return path, a cap on the top layer of the LTCC substrate is designed. The designed SMT pad was fabricated using the standard LTCC process. The measuredS11andS21are −14 and 0.9 dB, respectively, at 15 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1769–1772, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24447
Phenomenological and electrical modelization of microcoaxial probes for SNMM
Authors: Castagné M. , Falgayrettes P. , Nativel L. , Marchetti M. 
Published: April 2009

AbstractWe are presenting an unusual set microcoaxial for RF field, associated with a submicron position sensor. The near field is determined experimentally and calculated theoretically with comparative experiments. The measurements are interpreted as an electric model of the probe for applications on the submicron components. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1765–1769, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24448
Schemes of microwave hyperthermia by using flat left‐handed material lenses
Authors: Wang Gang , Gong Yu , Wang Hongjin 
Published: April 2009

AbstractEffective microwave hyperthermia of cancer is proposed by using slightly lossy flat left‐handed material lenses. High‐resolution focusing of microwave without any auxiliary foci can be achieved in tissue by jointly adjusting the sources behind the flat lenses. Two‐dimensional numerical simulations demonstrate that, for tumor of diameter of 0.6 cm immersed in lossy breast tissue, microwave power can be effectively localized in tumor volume and temperature in tumor may be raised to ∼43.5°C, while keeps below 42°C in the surrounding normal tissue as required in hyperthermia treatment. The proposed Γ‐shaped two‐lens system is proved to an efficient scheme for microwave hyperthermia. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1738–1743, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24449
Enhanced patch antenna performances using dendritic structure metamaterials
Authors: Liu Yahong , Zhao Xiaopeng 
Published: April 2009

AbstractThe patch antenna with dendritic structure metamaterials is proposed and the performance of the antenna is investigated numerically and experimentally. Dendritic structure metamaterials can possess negative permeability due to the resonance of the magnetic polarizability within a band where the electromagnetic wave cannot propagate. The dendritic structure has the merit of fairly high‐level of symmetry and can exhibit excellent isotropy. When the frequency of the antenna lies in the resonant bandgap, the performance of the antenna can be enhanced due to the fantastic electromagnetic characteristic of the dendritic structure. The study results show that compared with the conventional patch antenna without dendritic structure metamaterials, the half‐power beamwidth (HPBW) of the proposed antenna becomes more convergent and the gain is higher. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1732–1738, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24450
Short‐ended coaxial cylinder probe measuring bulk dielectric constant using TDR
Authors: Park Young‐Jin 
Published: April 2009

AbstractA simple short‐ended coaxial cylinder probe measuring bulk dielectric constant of porous media using time domain reflectometry (TDR) is presented. For the TDR application, reflection behavior of the probe is analyzed in time domain. For time domain analysis, first, input impedance of the probe is calculated using transmission line theory and impedance of each mode propagating in the probe. Second, reflection coefficient is obtained using the input impedance. For verification, a prototype is designed using analysis results and tested for the case of sand. The analysis results are in a good agreement with numerical simulations and measurements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1638–1640, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24451
Wideband circularly polarized microstrip antenna using broadband quadrature power splitter based on metamaterial transmission line
Authors: Zhao Gang , Jiao Yong‐Chang , Yang Xi , Lin Chen , Song Yue 
Published: April 2009

AbstractA new design of a wideband circularly polarized microstrip patch antenna with dual capacitively coupled feeds is presented in this article. Axial ratio bandwidth enhancement is achieved for microstrip patch antenna using a broadband quadrature power splitter (QPS). The microstrip and metamaterial transmission lines are connected to two output ports of a Wilkinson power divider as the QPS to achieve broadband quadrature phase difference. The antenna has been investigated numerically and experimentally. Measured results show that the antenna has an impedance bandwidth of 72.6% and a 3‐dB axial ratio bandwidth of 46.9%. The 3‐dB gain bandwidth is about 46.3%, with the peak gain level at 7.0 dBi. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1790–1793, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24452