bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study of ultra‐broadband patch antenna using a wedge‐shaped air substrate
Authors: Yao Feng‐Wei , Zhong Shun‐Shi , Liang Xian‐Ling 
Published: December 2005

AbstractIn this paper, an ultra‐broadband patch antenna using a wedge‐shaped air dielectric substrate is introduced. By adjusting the angle α, the experimental ratio bandwidth of S11 ⩽ −10 dB reaches 8.8:1, covering frequencies from 3.05 to 26.87 GHz. The measured impedance locus and radiation patterns at f = 6 GHz and at f = 18 GHz both are presented, and they show broadband characteristics and stability across the whole operating frequency bands, respectively. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 218–220, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21310
Internal patch antenna with an inset shielding metal case for mobile‐device application
Authors: Wong Kin‐Lu , Tseng Ting‐Chih 
Published: December 2005

AbstractAn internal patch antenna integrated with an inset shielding metal case for application in a mobile device is presented. The internal patch antenna is achieved by mounting a top radiating patch above the system ground plane of a mobile device and further short‐circuiting the top radiating patch to a shielding metal case, which is mounted on the system ground plane and inset into the region below the top patch. Since the shielding metal case provides a coupling‐free space for the RF modules/circuitry and other associated components, the proposed design leads to a compact integration of the internal antenna and the associated components in the mobile device. Details of the proposed design applied to a mobile device for UMTS (Universal Mobile Telecommunications Systems, 1920–2170 MHz) operation are described, and the experimental results are presented and discussed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 220–222, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21311
Wideband dielectric resonator antenna
Authors: Ruan Yu‐Feng , Guo Yong‐Xin , Shi Xiang‐Quan 
Published: December 2005

AbstractThis paper presents a new wideband dielectric resonator (DR) antenna. To enhance the bandwidth, two layers of stacked resonators having the same rotational axis of symmetry are used. At the bottom layer, a smaller cylindrical DR is placed concentrically inside a large annular‐ring DR, whereas at the top layer, there is only one cylindrical DR. A coaxial probe is placed off the antenna axis in the DR antenna in order to produce broadside far‐field radiation patterns. The effects of the antenna parameters such as dielectric constant, probe length, and excitation position as well as the air gap between the bottom layer of the stacked DRA and the ground plane are investigated numerically. A bandwidth up to 67% for a −10‐dB return loss is achieved for the proposed antenna. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 222–226, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21312
Analysis of adaptive antenna using electromagnetic band gap structure
Authors: Talleb H. , Lautru D. , Fouad Hanna V. 
Published: December 2005

AbstractThis paper presents the analysis of an adaptive antenna that is formed of a dipole antenna above a ground plane in the presence of electromagnetic band gap (EBG) metallic structures. Electromagnetic simulations are performed using the method of moments (MoM) and the obtained results show a good concordance with those that can be determined when using antenna‐array theory. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 226–229, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21313
Slow‐wave CPW resonator with defected ground structure (DGS) for filter applications
Authors: Akgün Özlem , Görür Adnan 
Published: December 2005

AbstractNovel slow‐wave CPW resonators with defected ground structures (DGSs) in a rectangularly spaced and open‐loop shapes are investigated. These structures have an extremely compact size. The simulations and experimental results verify that these structures provide a size reduction of about 54% as compared to a conventional CPW resonator. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 229–233, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21314
A 2.4‐GHz wireless‐over‐fiber transceiver using photonic active integrated antennas (PhAIAs)
Authors: Cryan M. J. , Dragas M. , Kung J. , Jain V. , Fornetti F. , Houle T. , Varrazza R. , Hill M. 
Published: December 2005

AbstractThe integration of a vertical cavity surface emitting laser (VCSEL) and a photodiode with two microstrip antennas results in low‐cost wireless‐optical transmitter and receiver modules and the initial microwave‐link results are shown. The VCSEL antenna is used as part of a fully bidirectional wireless‐optical link and data are successfully transferred between two wireless‐enabled laptops. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 233–237, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21315
A normalized plane‐wave method for 2D Helmholtz problems
Authors: Bogaert Ignace , Pissoort Davy , Olyslager Frank 
Published: December 2005

AbstractA new technique to diagonalize the 2D Green's function is presented. The new method, called the normalized plane‐wave method, is an extension of the plane‐wave method into the low‐frequency regime. As such, it provides a way to achieve 𝒪(𝒩) complexity for both low‐ as well as high‐frequency problems without having to resort to inhomogeneous plane‐wave methods. The accuracy of the proposed method is thoroughly tested and it is shown that it can be made as high as one may reasonably want in any of the frequency regimes. Furthermore, it is shown to be faster than the traditional fast‐multipole method (FMM) for low‐frequency problems, by virtue of diagonal translations. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 237–243, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21316
A method to generate a sparse matrix for thin‐wire structures using the method of moments
Authors: Bansal Hemant , Saxena Shashank , Singh Surendra , Waller Marsellas L. , Rao Sadasiva M. 
Published: December 2005

AbstractIn this work, a numerical procedure is presented to obtain a sparse moment matrix for thin‐wire electromagnetic scattering problems. The numerical procedure involves developing a set of basis functions spanning several subdomains, as opposed to spanning one or two subdomains in the conventional method of moments (MoM) procedure. The numerical results are presented for various wire structures (including wire junctions) and compared using the traditional MoM procedure. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:243–248, 2006; Published Online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21317
Distortion produced by RF MEMS varactors on digital communication signals
Authors: Lázaro Antonio , Girbau David , Pradell Lluís 
Published: December 2005

AbstractThis paper presents a study of the nonlinear effects introduced by MEMS varactors when excited with digitally modulated RF signals (QPSK and 16 QAM). The study is based on simulating a nonlinear model of the MEMS device using harmonic‐balance and envelope solvers, and on experimental measurements of the wave reflected by the on‐wafer MEMS device. It is shown that the adjacent‐channel power ratio (ACPR) and error‐vector magnitude (EVM) of the digital signal suffer a degradation due to the device nonlinear distortion. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:246–249, 2006; Published Online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21318
Comparing double‐negative and double‐positive covers around a radiating line current
Authors: Nelatury Sudarshan Rao 
Published: December 2005

AbstractThe power radiated by a line source per unit length, surrounded by a double‐negative (DNG) material is analytically found and compared with that obtained in case of a double‐positive (DPS) material. Results indicate that the presence of significant increase in the radiated power with a shift in resonance. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:250–252, 2006; Published Online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21319
Low‐power PHEMT MMIC LNA for C‐band applications
Authors: Yuk Jong Seol , Choi Byoung Gun , Lee You Sang , Park Chul Soon , Kang Sukhoon 
Published: December 2005

AbstractWe report on design and performance of a low‐power‐consuming two‐stage MMIC LNA using AlGaAs/GaAs pseudomorphic HEMTs with 0.25‐μm T‐gates. The MMIC LNA showing a noise figure of 2.55 dB with 17‐dB associated gain at 5.8 GHz consumes only 18 mW, which is the lowest value of power consumption ever reported to date from PHEMT MMIC LNAs around this frequency range, and is attributed to the optimization of the gate width and current, as well as the use of a circuit with a single current path. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:253–255, 2006; Published Online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21320
An empirical model for propagation‐loss prediction in indoor mobile communications using the Padé approximant
Authors: Fraiha Simone G. C. , Rodrigues Josiane C. , Barbosa Regiane N. S. , Gomes Hermínio S. , Cavalcante Gervásio P. S. 
Published: December 2005

AbstractThis paper presents a new model for propagation‐loss prediction in indoor mobile communications. It uses the free‐space loss model added to an empiric function (based on the Padé approximant), and a term that describes the signal randomness (typical of the RF propagation). In order to validate this model, a measurement verification was accomplished for a typical five‐floor building of a university. The loss predicted by this model had a mean error of 4.78 dB and a standard deviation of 6.05 dB in relation to the measured data. The formulation of the model does not require accurate information about the environment used in the study, such as the permittivity of the construction materials, layout of the furniture, and so forth, but only needs to be adaptable to any indoor environment. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:255–261, 2006; Published Online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.21321
Modification to convolution CFS‐PML for the ADI‐FDTD method
Authors: Wang Linnian , Liang Changhong , Li Long 
Published: December 2005

AbstractA new implementation of perfectly matched layer (PML) using the recursive‐convolution technique is introduced for an alternating‐direction implicit (ADI) finite‐difference time‐domain (FDTD) method. Based on a “complex frequency‐shifted (CFS)” scaling function, this PML boundary condition is highly effective at absorbing low‐frequency evanescent waves. The numerical results show that, compared with its previously suggested analogue, the new method improves the reflection error by 30 dB for large time‐step sizes. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 261–265, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21322
Fresnel coefficients for a permittivity‐permeability phase space encompassing vacuum, anti‐vacuum, and nihility
Authors: Lakhtakia Akhlesh , Mackay Tom G. 
Published: December 2005

AbstractThe concept of the electromagnetic trinity comprising vacuum, anti‐vacuum, and nihility is extended to a zone in the 4‐D εr‐μr phase space that was largely inaccessible until the recent emergence of negative‐phase‐velocity materials. Expressions for Fresnel coefficients are derived for the reflection of plane waves at the planar interface of vacuum and a homogeneous, isotropic, dielectric‐magnetic medium with constitutive properties lying in that zone. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 265–270, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21323
Compact 2D Hilbert microstrip resonators
Authors: Crnojević‐Bengin Vesna 
Published: December 2005

AbstractNovel compact microstrip resonators consisting of multiple 2D Hilbert prefractal curves are presented. Proposed resonators use fractal curves of the 3rd and 4th orders to achieve length reduction of over 64% and 81%, respectively, when compared to the conventional capacitively coupled resonators tuned to the same frequency. A configuration with fractal curves of the 3rd order, fabricated in standard PCB technology, exhibits improvement of unloaded Q‐factor within range from 15% to 90%, depending on the resonant frequency. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 270–273, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21324
1.55‐μm DFB lasers over a wide temperature range for analog application
Authors: Koo Bon‐Jo , Song Han‐Wook , Kim Yong‐Kwan , Park Chil‐Sung , Ryu Han‐Gwon , Huh Kwang‐Soo , Park Seung‐Bae , Lhee Zail , Choe Hyosin , Lee Seok , Han Sang‐Kook 
Published: December 2005

AbstractStrained‐layer multiquantum‐well distributed‐feedback (SL‐MQW‐DFB) lasers at a wavelength of 1.55 μm operating from −40°C to 85°C without any coolers are demonstrated. The average value of IMD3 at 1.8 GHz and 5 mW operating conditions was −71 dBc, and the RIN at 2 mW was measured as 151 dB/Hz. The uncooled DFB lasers we have developed are very useful for mobile applications. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 273–275, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21325
Permittivity measurement of low and high loss liquids in the frequency range of 8 to 40 GHz using waveguide transmission line technique
Authors: Afsar Mohammed N. , Suwanvisan Nattakarn , Wang Yong 
Published: December 2005

AbstractThis paper presents the complex permittivity of a number of liquids measured using waveguide transmission‐line techniques. These liquids are measured over four frequency ranges: 8–12.4 GHz, 12.4–18 GHz, 18–26.5 GHz, and 26.5–40 GHz (or at the X, Ku, K, and Ka bands). The measured results of liquids are discussed and compared with results in the literature and the calculated data using Debye's method. Finally, statistical values such as the means and standard deviations, and the percentages of permittivity errors are computed for the consideration of data spread and error estimation. All of the possible sources of errors are also discussed with regard to improvements and developments of measurements in the near future. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 275–281, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21326
A novel compact bandpass filter using microstrip defected ground structure
Authors: Shi Jin , Li JiaLin 
Published: December 2005

AbstractA novel compact microstrip bandpass filter using a dumbbell‐shaped defected ground structure (DGS) etched in ground plane under microstrip line is proposed. The bandpass characteristic is easy to obtain by adjusting the bandgaps of the DGS resonators. The filter has the advantages of compact size, high selectivity, and high out‐of‐band suppression due to the transmission zeros. The theoretical and experimental results of the proposed bandpass filter are presented and show good agreement. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 281–283, 2006; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/mop.21327
Suppression of spurious radiations of patch antennas using split‐ring resonators (SRRs)
Authors: Lee Jae‐Gon , Lee Jeong‐Hae 
Published: December 2005

AbstractThe spurious radiation of patch antennas is suppressed by the band‐stop characteristic of split‐ring resonators (SRRs). The SRRs are located near the feed line of the upper substrate so as to couple the perpendicular magnetic field to the SRRs. The SRRs can be characterized with negative permeability and positive permittivity around the resonance frequency and, thus, waves cannot propagate. To eliminate the first and second spurious radiations, the design equations of a band‐stop filter using SRRs are suggested. The reflection coefficient and the far‐field radiation pattern of a patch antenna with SRRs are obtained via full‐wave simulation and measurement. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 283–287, 2006; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/mop.21328
A wideband array antenna with beam‐steering capability using real valued weights
Authors: Bialkowski Marek E. , Uthansakul Monthippa 
Published: December 2005

AbstractThis article presents an array antenna with beam‐steering capability in azimuth over a wide frequency band using real‐valued weighting coefficients that can be realized in practice by amplifiers or attenuators. The described beamforming scheme relies on a 2D (instead of 1D) array structure in order to make sure that there are enough degrees of freedom to realize a given radiation pattern in both the angular and frequency domains. In the presented approach, weights are determined using an inverse discrete Fourier transform (IDFT) technique by neglecting the mutual coupling between array elements. Because of the presence of mutual coupling, the actual array produces a radiation pattern with increased side‐lobe levels. In order to counter this effect, the design aims to realize the initial radiation pattern with a lower side‐lobe level. This strategy is demonstrated in the design example of 4 × 4 element array. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 287–291, 2006; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/mop.21329
Phase‐mode‐based construction of a coupling matrix for uniform circular arrays with a center element
Authors: Rogier Hendrik 
Published: December 2005

AbstractA rigorous circuit model with a limited number of parameters is presented to describe mutual coupling in uniform circular arrays (UCAs) with a center element. The model, which is based on a phase‐mode expansion, is applied to construct a coupling matrix in order to compensate for mutual coupling in this type of arrays. A sample dual‐band uniform circular array with center element illustrates the use of the coupling matrix for direction‐of‐arrival (DOA) estimation. It is explained in which cases mutual coupling is fully taken into account by the coupling matrix and in which cases some residual errors due to mutual coupling remain in the DOA. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 291–298, 2006; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/mop.21330
Full‐wave analysis of single and coupled striplines in multilayered cylindrical dielectrics using the 3D TLM method
Authors: Gupta Alok Kumar , Mohan Akhilesh , Biswas Animesh 
Published: December 2005

AbstractIn this paper, an inhomogeneous, multilayered cylindrical stripline is analyzed using the 3D‐TLM method. Dispersion characteristics of dominant as well as higher‐order modes are obtained for single and coupled cylindrical striplines. Impedance characteristics for the dominant mode are also obtained for the same. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 298–302, 2006; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/mop.21331
Performance of integrated antennas on silicon substrates of high and low resistivities up to 110 GHz for wireless interconnects
Authors: Zhang Y. P. , Sun M. , Fan W. 
Published: December 2005

AbstractMonopoles of 1‐mm axial length are designed and fabricated on silicon substrates of high‐resistivity 5 kΩ‐cm and low‐resistivity 10 Ω‐cm, respectively. We measure their performance up to 110 GHz for wireless interconnects for the first time. The reflection measurements show that a sharp resonance can be seen at 75 GHz for the meander monopole and monopole pairs at 67 and 104 GHz for the zigzag 30° monopole on the silicon substrate of high resistivity, but no such sharp resonance can be seen for those on the silicon substrate of low resistivity. Transmission measurements show that a high‐gain window exists. The existence of the high‐gain window is the most important finding of this work and is useful in the design of chip‐scale radios or wireless chip area networks. This suggests that the operating frequency of wireless interconnects be allocated within the high‐gain window for good performance. Furthermore, metal lines running parallel with or vertical to the monopole pairs are observed to improve the highest gain of this window area. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 302–305, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21332
Noise reduction using photonic microwave filter for radio over fiber system
Authors: Lu Jinyue , Chi Hao , Zhang Xianmin , Shen Linfang 
Published: December 2005

AbstractA photonic microwave filter based on fiber loop and fiber Bragg gratings (FBGs) is applied in a radio‐over‐fiber (RoF) system to suppress the relative intensity noise (RIN) of laser and the amplified spontaneous emission (ASE) noise of erbium‐doped fiber amplified (EDFA). The experiment results show that the signal‐to‐noise ratio (SNR) of the system can be effectively improved by using such a noise filter in the system. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 305–307, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21333
A novel tulip‐shaped monopole antenna for UWB applications
Authors: Chang Dau‐Chyrh , Liu Ji‐Chyun , Liu Ming‐Yen 
Published: December 2005

AbstractA novel planar monopole antenna designed with tulip‐shaped structure is proposed for UWB applications. The corolla of tulip‐shaped structure is constructed with petal and calyx by the EM‐mode synthesis. By tuning the petal structure, wideband performance covering 2.55 to 40.5 GHz (1:16) with −10‐dB return loss is measured. The radiation patterns are omnidirectional patterns. Antenna gain is 0.2 to 4.0 dBi in the operating range. The current distributions are simulated for demonstration. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 307–312, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21334
Implementation of a low‐cost phase‐locked loop clock‐recovery module for 40‐Gb/s optical receivers
Authors: Woo Dong Sik , Kim Kang Wook , Lim Sang‐Kyu , Ko Jesoo 
Published: December 2005

AbstractA low‐cost, compact, high‐performance clock‐recovery (CR) module using a new phase‐locked loop (PLL) for 40‐Gb/s optical receivers is successfully designed and implemented. The newly implemented frequency detector in the PLL helps to reduce the current consumption and also extended the frequency‐capture range. The implemented PLL clock‐recovery module demonstrates advantages over the conventional open‐loop type clock‐recovery module with a DR filter by significantly improving clock jitter, thus reducing overall module cost, and allowing the possibility of providing a proper clock signal in the case of temporary loss of NRZ input signals. The CR module exhibits error‐free operation during a 30‐min BER test with a time‐division‐multiplexing (TDM) 40‐Gb/s transmission system. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 312–315, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21335