bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of cladding modes in an asymmetric dual‐core fiber
Authors: Chan Florence Y. M. , Yasumoto Kiyotoshi , Sharma Enakshi K. 
Published: December 2008

AbstractA theoretical analysis of the cladding modes is presented for an asymmetric dual‐core fiber that consists of a primary core near the fiber axis and a secondary core. Numerical examples are given to demonstrate that the approximation of a two‐layer fiber geometry is inadequate to describe the accurate modal properties of the cladding modes. It is shown that the field distributions of the cladding modes are dependent on the azimuthal angle under the presence of two cores. The maximum field intensities are located away from the fiber axis with a shift in the local maxima in the primary core toward the secondary core. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 507–510, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24066
Erratum: Application of the tree‐cotree splitting for improving matrix conditioning in the full‐wave finite‐element analysis of high‐speed circuits
Authors: Lee Shih‐Hao , Jin Jian‐Ming 
Published: December 2008

AbstractOriginally published Microwave Opt Technol Lett 50:1476–1481, 2008. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 582, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24068
RF optoelectronic oscillator using a directly modulated semiconductor laser and a fiber optical ring filter
Authors: Kotb H. E. , Safwat A. M. E. , Boghdady H. , Khalil D. A. M. 
Published: December 2008

AbstractIn this article we present an RF optoelectronic oscillator based on directly modulated laser diode and an all optical RF filter. The system is modeled and simulated using standard simulators. Using commercial modules and standard single mode fiber, the implemented system shows an RF oscillation with 9.8 dBm at 1.1 GHz. We also show that the use of an all optical RF filter allows a sidemode suppression ratio more than 50 dB without affecting the signal purity. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 470–475, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24069
Dual‐band square slot antenna with embedded crossed strips for wireless local area network applications
Authors: Sze Jia‐Yi , Chang Wei‐Shan 
Published: December 2008

AbstractA new compact microstripline‐fed square slot antenna with embedded crossed strips is proposed for dual‐band wireless local area network (WLAN) applications. Connected to the two upper inner corners of the slotted ground, the crossed strips can extend the path of the current distributed on the ground plane, thus effectively lowering the first resonant band of the antenna. The ratio of the center frequencies of the first two resonant bands can be tuned within a range of 1.8–2.6 by adjusting the angle between the crossed strips and the length of the parts of the crossed strips below the intersection point. An antenna prototype suitable for 2.45/5.25‐GHz WLAN bands was successfully designed and fabricated for verification. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 435–439, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24070
Closed‐form expression of asymmetric stripline open‐end and its applications for analysis of LTCC components and circuits
Authors: Tang Wanchun , Yu Zhengyong , Nai Yu , Chow Y. Leonard 
Published: December 2008

AbstractIn this article, we have obtained simple excess capacitance formula for asymmetric stripline open‐end. The average error of the formula is less than 2%. On the basis of this formula and the field‐based equivalent circuit model obtained by the authors before, a low‐pass filter and an edge coupled stripline band‐pass filter are analyzed by the field‐based equivalent circuit together with the excess capacitance formula of this article. Compared with numerical results, the average errors of S parameters are less than 2%. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 406–408, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24072
Substrate integrated waveguide fed printed dipole array antenna for isolating the RF front‐end from the antenna
Authors: Yu Chen , Hong Wei , Kuai Z. Q. , Chen J. X. , Tian Ling , Yan P. P. 
Published: December 2008

AbstractA novel feeding structure using substrate integrated waveguide technique for double side printed dipole antenna is presented in this article, which isolates the RF front‐end from the antenna effectively in an integrative radio access unit of distributed wireless communication systems. An array antenna with eight double side printed dipoles is designed and fabricated. The return losses and radiation patterns of the antenna element and the array antenna are measured, and the results are in good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 557–562, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24075
Design and implementation of planar ultra‐wideband antennas characterized by multiple notched bands
Authors: Dong Yuan Dan , Hong Wei , Zhou Jian Yi , Kuai Zhen Qi 
Published: December 2008

AbstractA new approach for the design of planar ultra‐wideband (UWB) antennas having multiple band‐notched functions is studied and presented. In this approach, a planar dual‐stopband filter based on a dual‐mode resonator is first investigated carefully, which employs a half‐mode substrate‐integrated waveguide cavity to improve the quality (Q) factor. Then, this filter is applied to the design of a UWB antenna with dual band‐notched characteristics. Finally, two triple band‐notched antennas are implemented by incorporating two different resonators in the radiation element of the UWB antenna, respectively. Voltage standing wave ratio (VSWR), gain, and radiation pattern are measured. High and sharp band‐rejection characteristic for each of the frequency notch as well as a very wide impedance bandwidth is achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 520–426, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24076
A compact wideband microstrip bandpass filter using parallel‐coupled‐lines with periodical grooves
Authors: Li Lin , Li Zheng‐Fan 
Published: December 2008

AbstractA wideband bandpass filter using parallel‐coupled‐lines with periodical grooves is presented in this article. Owing to the slow wave effect brought by periodical grooves, the proposed structure's resonant frequency can be lowered effectively. This effect has been used in this article to realize wideband filter with compact size. Based on this theory, a two‐pole compact wideband bandpass filter using proposed structures is designed and fabricated as a sample. The simulated and measured results show the validity of the proposed structure. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 518–520, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24077
A right slotted patch dual‐mode dual band bandpass filter used for WLAN
Authors: Su Yan‐Kuin , Chen Jau‐Rung , Weng Min‐Hang , Hung Cheng‐Yuan 
Published: December 2008

AbstractWe proposed a novel dual‐mode dual band bandpass filter (BPF) operating at 2.4/5.7 GHz by using a right cross‐slotted patch resonator (RCSPR) combined with a pair of square etched areas (SEAs). A pair of right crossed slot embedded in the center of the patch resonator is used to tune the resonant modes having 2.4/5.7 GHz responses. In this design, a pair of SEAs etched within the RCSPR is provided to be the perturbation element to generate the filter performance with the transmission zeros near the passband edges. It is shown that the fabricated filter has good dual‐band performances at 2.4/5.7 GHz with high selectivity, narrow bandwidth, and very sharp attenuation rate due to the existence of the transmission zeros. Measured results of the fabricated BPF have a good agreement with the full‐wave simulation results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 491–494, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24078
An integral equation‐fast Fourier transform‐based hybrid method for analysis of wire‐surface configurations on electrically large platforms
Authors: An Xiang , Lü Zhi‐Qing 
Published: December 2008

AbstractThis article presents an efficient hybrid method with the IE‐FFT algorithm for solving scattering and radiation problems of wire antennas mounted on electrically large platforms. To model arbitrary metallic structures, including wire antennas and both open and closed surfaces, in this method, the electric field integral equation (EFIE) and the magnetic field integral equation (MFIE) are applied separately to geometrically distinct regions of an object. The EFIE is used to represent wire antennas and open surfaces, while the MFIE is employed for closed surfaces to improve the convergence rate. The resulting matrix system is solved by an iterative algorithm, and the IE‐FFT method is adopted to reduce the memory requirements and computational complexity toO(N1.5) andO(N1.5logN), respectively, for three‐dimensional perfectly electric conductor problems. Some numerical examples are provided to demonstrate the accuracy and efficiency of the method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 486–490, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24079
Multiband (WiBro/WCDMA/CDMA 2000 1×) voltage‐controlled oscillator for mobile communication
Authors: Lee Sangho , Lee Jaehyuk , Park Jihyun , Kim Hyeongdong 
Published: December 2008

AbstractIn this article, a fully integrated multiband voltage‐controlled oscillator (VCO) implemented in a 0.18‐μm CMOS process is presented. A complementary differential structure that consists of NMOS and PMOS transistors is used for low power consumption. To achieve good phase noise performance, no current source is used in the structure. MOS switches are employed for multiband selection. In addition, four MOS varactors are added for band fine tuning; the first pair of MOS varactors is employed for channel selection, and the second pair of MOS varactors and MOS switches is employed for band selection. The total chip area of the VCO is 1.2 mm × 0.85 mm. The measured phase noise levels of the VCO are −98.8 dBc at 100 kHz, −116.4 dBc at 1MHz, −135 dBc at 10 MHz for CDMA 2000 1×, WCDMA, and WiBro, respectively. The VCO draws 13 mA and consumes 23.4 mW with output buffers within the operating frequency of a 1.8 V supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 416–418, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24081
A novel P‐shaped printed monopole antenna for RFID applications
Authors: Yang Hanhua , Yan Shu 
Published: December 2008

AbstractIn this article, a novel p‐shaped printed monopole antenna is first proposed to operate simultaneously at the 2.45 and 5.8 GHz bands for radio frequency identification tag. Printed on a standard 1.6 mm FR4 substrate material, the printed monopole antenna has been demonstrated to provide an ultra wide 10 dB return loss bandwidth with satisfactory gains and radiation properties. The parameters which affect the performance of the antenna in terms of its frequency domain characteristics are investigated. A good agreement is achieved between the simulation and the experiment. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 554–556, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24083
The miniature microstrip square‐ring 2.4/5.2 GHz dual‐band bandpass filter
Authors: Kung Cheng‐Yuan , Chen Yin‐Chung , Yang Cheng‐Fu , Chen Hua‐Ming 
Published: December 2008

AbstractA 2.4/5.2 GHz dual‐band bandpass filter is designed and printed on Al2O3 ceramic substrate. The filter is based on two square‐patch resonators and two T‐type input/output lines. The square‐ring structure is used to replace the square‐patch for minimization because of longer current path. Using the higher dielectric constant and loss tangent ceramic substrate, the proposed filters have the advantages of low insertion loss, high out‐of‐band rejection, mini size, and simple structure. As compared to the square‐patch filter, the proposed square‐ring filter has 51% size reduction. And the measured results of the fabricated filters have good agreement with the simulated values. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 515–518, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24085
Design concept of multiband antennas under the influence of the human body
Authors: Jung Byungwoon , Lee Hyunkyu , Byun Joonho , Won Jung Chang , Park Myun‐Joo , Chung Young‐Seek , Lee Byungje 
Published: December 2008

AbstractA novel wideband antenna, consisting of a double T‐shaped element and a coaxial cable, is proposed for multiband applications including AMPS, GSM, DCS, PCS, UMTS, and WiBro bands. The proposed antenna also mitigates the degradation of an antenna performance due to the human body. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 513–515, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24086
Resonance frequency of hexagonal and half hexagonal microstrip antennas
Authors: Ray K. P. , Pandey M. D. 
Published: December 2008

AbstractClosed form expressions for the accurate calculation of the resonance frequency of a hexagonal and half hexagonal microstrip antennas, based on their equivalence with rectangular microstrip antenna, have been presented. These proposed empirical formulae have been validated using simulations and experiments. Design curves, for the input impedance variation along the feed axis, have been presented for hexagonal and half hexagonal patches for two feed positions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 448–452, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24087
A wideband GaN HEMT power amplifier based on the dual‐fed distributed structure for WiMAX applications
Authors: Lee Yong‐Sub , Lee Mun‐Woo , Jeong Yoon‐Ha 
Published: December 2008

AbstractIn this article, we propose a wideband GaN HEMT power amplifier (PA) based on the dual‐fed distributed structure for 2.6 GHz WiMAX applications. For a continuous wave, the distributed PA shows the wideband performance compared with the conventional balanced PA. When the distributed PA is optimized by controlling the gate bias voltages, the wideband performance over 150 MHz is achieved for a WiMAX signal with a PAR of 9.47 dB and the signal bandwidth of 28 MHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 574–577, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24090
Ultra‐wideband MIMO antenna with enhanced isolation
Authors: Lin Shun‐Yun , Huang Hong‐Ren 
Published: December 2008

AbstractThis article presents a four‐element multi‐input multi‐output (MIMO) antenna design. To enhance the mutual isolations for ultra‐wideband operation in 2–6 GHz, a circular slot antenna with a stepped ground plane was used as an element of the MIMO antenna. Such fabrications generate nonplanar connections and discontinuous interfaces between the elements and the system ground planes. This strategy effectively decreases the mutual coupling and provides 10 dB enhancements in isolation characteristics. Both theoretical and practical investigations on the adequate information for understanding the proposed antenna's characteristics are implemented and examined experimentally. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 570–573, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24091
Horseshoe‐shaped antenna for dual‐band WLAN communications with multi‐L slots
Authors: Kwak Kyung‐Sup , Choi Sun‐Ho 
Published: December 2008

AbstractIn this study, a novel horseshoe‐shaped antenna with multi‐L slots for 2.4/5‐GHz wireless local area network (WLAN) operations is designed and fabricated. To obtain sufficient bandwidth when return loss (RL) < −10dB, multi‐L slots are inserted (2.4 GHz) in the patch and a coaxial probe source is used. The measured result of the fabricated antenna is a 10.6% bandwidth from 2.38 to 2.51 GHz and a 28.4% bandwidth from 5.10 to 5.88 GHz (RL < −10dB), the gain 2.04–2.58 dBi. And a good radiation pattern is achieved over the WLAN band (2.4–2.484 GHz and 5.15–5.825 GHz) range. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 463–465, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24096
Effect of nonlinear wavelength scanning to Fourier transform white‐light interferometry
Authors: Jiang Yi , Tang Caijie 
Published: December 2008

AbstractThe effect of nonlinear wavelength scanning to Fourier transform white‐light interferometry was examined. A Mach‐Zehnder interferometer was interrogated, and the absolute optical path difference was measured. The experimental results show that the nonlinearity of the Fabry‐Perot tunable filter has no effect on the measurement. A measuring discrimination of 3 nm is achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 426–432, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24097
A compact triangular patch bandpass filter
Authors: Kelly James R. , Seager Rob D. 
Published: December 2008

AbstractThis article describes an effective mechanism for miniaturizing a microstrip triangular patch resonator. Measurement results show that the technique can yield ∼56% size reduction. The article also provides design equations which can be used to determine the size of discontinuity required in order to achieve a specific resonant frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 566–570, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24099
A method for characterization of intermodulation distortion produced in MEMS switches
Authors: Girbau D. , Pradell L. , Lázaro A. , Peyrou D. , Pons P. , Calmon P. , Plana R. , Coccetti F. 
Published: December 2008

AbstractThis article proposes an alternative method, based on reflection measurements, to characterize intermodulation distortion (IMD) in MEMS switches. Because of the low intermodulation level generated in MEMS switches, its characterization is problematic, requiring high‐power RF tones (high power amplifiers). Using the proposed reflection‐based method, IMD can be characterized saving up to 6 dB power when compared with that power required in a traditional 2‐tone intermodulation measurement set‐up in transmission. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 526–529, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24102
Implementation of high quality‐factor on‐chip tuned microwave resonators at 7 GHz
Authors: Melik Rohat , Demir Hilmi Volkan 
Published: December 2008

AbstractWe report on the design, analytical modeling, numerical simulation, fabrication, and experimental characterization of chip‐scale microwave resonators that exhibit high quality‐factors (Q‐factors) in the microwave frequency range. We demonstrate high Q‐factors by tuning these microwave resonators with the film capacitance of their LC tank circuits rather than the conventional approach of using external capacitors for tuning. Our chip‐scale resonator design further minimizes energy losses and reduces the effect of skin depth leading to high Q‐factors even for significantly reduced device areas. Using our new design methodology, we observe that despite the higher resonance frequency and smaller chip size, the Q‐factor is improved compared with the previous literature using traditional approaches. For our 540 μm × 540 μm resonator chip, we theoretically compute a Q‐factor of 52.40 at the calculated resonance frequency of 6.70 GHz and experimentally demonstrate a Q‐factor of 47.10 at the measured resonance frequency of 6.97 GHz. We thus achieve optimal design for microwave resonators with the highest Q‐factor in the smallest space for operation at 6.97 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 497–501, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24103
Low power size‐efficient CMOS UWB low‐noise amplifier design
Authors: Jhon Hee‐Sauk , Song Ickhyun , Jeon Jongwook , Koo MinSuk , Park Byung‐Gook , Lee Jong Duk , Shin Hyungcheol 
Published: December 2008

AbstractThe design and measurement results of 3–5 GHz fully integrated ultra‐wideband (UWB) CMOS LNA are presented. To boost the transconductance of the LNA and to reduce circuit area effectively, we eliminate a source degeneration inductor using resistive‐feedback cascode structure. The implemented UWB LNA shows peak gain of 10.8 dB, more than 10 dB of input return loss, and a noise figure of 3.3–4.2 dB from 3 to 5.1 GHz with power dissipation of 14 mW. The input P1dB and input IP3 (IIP3) at 4 GHz are about −6 dBm and +4 dBm, respectively. For low cost, the LNA has been fabricated using a 0.18‐μm thin metal CMOS process with top metal thickness of 0.84 μm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 494–496, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24104
A bent, shorted, planar monopole antenna for 2.4 GHz WLAN applications
Authors: Su Saou‐Wen , Chang Fa‐Shian 
Published: December 2008

AbstractA simple, bent monopole antenna well useful for WLAN applications in the 2.4 GHz band is presented. The monopole antenna has a rectangular radiating plate in general and is short‐circuited to a small antenna ground and an assembly plate. The assembly plate is not only used as a supporting plate for antenna installation but also regarded as antenna ground. With a low profile of the monopole and use of the coaxial‐line feed, the antenna has much flexibility in the placement inside a wireless device. Good radiation characteristics have been observed too. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 455–457, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24106