bluuebunny/crossref_metadata_2025_split huggingface dataset:
An efficient EYDFA with a 54 dB small signal gain
Authors: Muhd‐Yassin S. Z. , Harun S. W. , Abdul‐Rashid H. A. , Abd‐Rahman M. K. , Rahman F. Abd , Ahmad H. 
Published: July 2007

AbstractAn efficient erbium/ytterbium codoped fiber amplifier is demonstrated by using a dual‐stage configuration with a midway optical isolator and a band‐pass filter (BPF). The amplifier achieved a maximum low signal gain of 54 dB and a corresponding noise figure of 6.5 dB (1536 nm) using the input signal power and total pump power of −50 dBm and 140 mW, respectively. The gain obtained by the amplifier was about 12.5 dB higher than the gain of a conventional single‐stage amplifier whereas its noise figure was 3.5 dB lower. Both isolator and BPF contribute to gain and noise figure improvements by blocking backward and forward propagating amplified spontaneous emission. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2337–2339, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22750
Non surgical life saving diagnostic procedure using microwaves
Authors: Lonappan Anil , Thomas Vinu , Bindu G. , Jacob Joe , Rajasekaran C. , Mathew K. T. 
Published: July 2007

AbstractThe physiological changes of pregnancy can result in complications in the mother, which in turn may have fetal implications. There is a need to refine the risk stratification of women so that they can receive appropriate obstetrical counseling and care. The present communication presents the analysis of the amniotic fluid which is surrounded by the baby and helps to protect both the baby and the uterus. The in vitro measurements of amniotic fluid samples were carried out by cavity perturbation technique in the frequency range of 2–3 GHz of different samples as a function of gestation weeks and have observed a pronounced change of the conductivity at the end of normal pregnancies and consistent conductivity in complicated pregnancies. This indicates that microwave study is a life saving diagnostic procedure of the mother and baby can take proper care for those having complicated pregnancies. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2364–2368, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22753
Low‐phase noise 3 42 GHz signal generation using high‐order longitudinal modes of a coaxial loop cavity
Authors: Wang Xinyue , Wang Ziyu 
Published: July 2007

AbstractThis article demonstrates a novel coaxial loop cavity microwave/mm‐wave generator. Working at high‐order longitudinal modes, the generator has the single‐sideband phase noise of about −75 and −105 dBc/Hz at 10 and 100 kHz offset over the frequency band of 3–42 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2329–2331, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22754
New analog predistorer using mixing operation for independent control of IM3 components
Authors: Lee Yong‐Sub , Lee Mun‐Woo , Choi Gil‐bok , Jeong Yoon‐Ha 
Published: July 2007

AbstractThis article reports new predistorters using mixing operation. For compensate the memory effect of the power amplifier, the lower and upper third‐order intermodulation components in the PD are controlled independently. From the measured results for a two‐tone signal with 20‐MHz tone spacing, the significant IM3 cancellation over 40 dB is achieved over a whole output power range. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2552–2555, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22758
A low voltage highly linear 24‐GHz down conversion mixer in 0.18‐μm CMOS
Authors: Hossain Masum , Frank Brian M. , Antar Yahia M. 
Published: July 2007

AbstractA K‐band low voltage, highly linear folded Gilbert cell mixer in 0.18‐μm CMOS is presented. An optimization technique been introduced which is particularly applicable to Gilbert cell type mixers. This technique has been experimentally verified with a down conversion mixer fabricated in a 0.18‐μm CMOS process. Utilizing PMOS devices in the transconductance stage and using a 2‐V supply voltage, the mixer can down convert from 24 GHz to 10 MHz with an input referred third order intercept of +20 dBm and a conversion gain of 2 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2547–2552, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22759
Improvement of antenna isolation in hand‐held devices using miniaturized electromagnetic band‐gap structures
Authors: Mäkinen Riku , Pynttäri Vesa , Heikkinen Jouko , Kivikoski Markku 
Published: July 2007

AbstractMiniaturized electromagnetic band‐gap (EBG) structures suitable for hand‐held devices at 1.575 and 2.4 GHz frequency bands are presented. To miniaturize the structures, a ceramic substrate with relative permittivity of 82 is used to obtain a period of the order of 2.6–3.5 mm. Simulation results are presented for slotted‐patch and two‐dimensional (2‐D) fork EBGs at 1.575 GHz. Measured results are presented for spiral EBG at 2.4 GHz. Measured data with good isolation and radiation properties validates the concept of proposed EBG structures. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2508–2513, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22761
Small size stepped impedance low pass filters
Authors: Mohra Ashraf S. , Alkanhal Majeed A. 
Published: July 2007

AbstractA reduction in the overall size of the stepped impedance low pass filter is proposed in this article. The high impedance line sections are converted to T‐sections and the low impedance line sections are converted to π‐sections. Analysis and design equations for such conversions are presented. This method accomplishes a prominent size reduction in sharp response filters with multi‐stepped impedance sections. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2398–2403, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22766
Theory of optical scattering by carbon nanotubes
Authors: Mikki Said M. , Kishk Ahmed A. 
Published: July 2007

AbstractHere, a theory of optical scattering by single‐wall carbon nanotube using modal expansion of the scattered and transmitted fields is developed. The effective‐boundary condition, derived previously using accurate quantum‐mechanical one‐electron tight‐biding approach, is employed to obtain the unknown coefficients in the series expansion. The complete scattered field is then derived analytically and compared to Rayleigh spectroscopy experiments. Very good agreement with the empirical data is observed. The theory is shown to produce expressions for the dielectric function of carbon nanotubes that can be used for further study of the optical and electronic structure. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2360–2364, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22768
Cross‐polarisation tracking errors of a radome covered monopulse radar
Authors: Arpin Frédéric , Ollevier Thomas 
Published: July 2007

AbstractThis paper examines the additional cross‐polarisation tracking errors generated because of the depolarisation effect of an ogive‐shaped radome. A comparison is made between the cross‐polarisation tracking errors of a linearly polarised monopulse radar in the presence and absence of an ogive‐shaped radome. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2354–2360, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22769
A simple dispersion relation of infinitely slotted rectangular waveguide
Authors: Lee Sung U. , Eom Hyo J. 
Published: July 2007

AbstractA simple, accurate dispersion relation for an infinitely slotted rectangular waveguide is presented by using the mode‐matching technique. Computed results are in agreement with measured data. A solution based on the single‐mode approximation is valid for practical leaky‐wave antenna applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2322–2324, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22770
A 180–196 GHz image‐reject Schottky‐diode MMIC mixer
Authors: Archer John W. , Tello Juan 
Published: July 2007

AbstractThis article describes a novel single‐sideband, Schottky diode integrated circuit mixer. The subharmonically pumped mixer, operating on the 4th local oscillator (LO) harmonic, was developed for use in millimeter‐wave receiver and transmitter applications in the 180–196 GHz band. The gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) was fabricated using a standard commercial process. This is the first time a fully integrated, 4th harmonic image reject mixer has been reported in this frequency range. The mixer operates with a fixed pump frequency of 47 GHz (corresponding to an LO of 188 GHz) and pump power level of +18.7 dBm. For RF signals in the range 180–196 GHz, the conversion loss is typically 21 dB over the 1–8 GHz IF corresponding to the desired sideband. Under these conditions, high rejection of the undesired sideband is achieved. The rejection is typically >15 dB, over the same IF frequency range, relative to the desired signal. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2319–2322, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22771
Multidomain pseudospectral time‐domain algorithm in curvilinear coordinates system
Authors: Shi Yan , Liang Chang‐Hong 
Published: July 2007

AbstractMultidomain pseudospectral time‐domain (MPSTD) algorithm, previously proposed for a Cartesian coordinates system, is extended to Maxwell's equations in a curvilinear coordinates system and applied to electromagnetic wave problems. A novelty patching technique is derived to effectively implement the boundary conditions at the interface between two adjacent subdomains by using characteristic variables. A perfectly matched layer (PML) in a curvilinear coordinates system is constructed according to a well‐posed PML in a Cartesian coordinates system. Numerical results are presented to illustrate the efficiency and accuracy of the method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2618–2624, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22772
Fully integrated frequency synthesizer design for wireless network application with digital programmability
Authors: Fu Jeffrey Shiang , Teo T. Hui , Tan Eng Leong 
Published: July 2007

AbstractA 2.60‐GHz integer‐N frequency synthesizer was designed and implemented in SiGe BiCMOS technology. The single chip includes fully integrated VCO (voltage control oscillator) as well as LPF (loop‐filter). The synthesizer provides a wide frequency range of 300 MHz, which covers 2.59–2.66 and 2.8725–2.9025 GHz, with a single VCO. Digital technique is employed at VCO and charge‐pump to cover the frequency range and cater for process variation. Using reference frequency of 2.5 MHz, the fabricated prototype demonstrates a settling time of 32 μs, and reference spur below −56 dBc. The synthesizer's phase noise is −115 dBc/Hz at 1.0‐MHz offset frequency. It consumes approximately 42 mW power from a 3.0 V single supply, with a total active area of 2.34 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2579–2582, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22773
Fractal‐shaped Hi‐Lo microstrip low‐pass filters with high passband performance
Authors: Chen Wen‐Ling , Wang Guang‐Ming , Qi Yi‐Na 
Published: July 2007

AbstractHi‐Lo microstrip low‐pass filters using Koch fractal shapes are proposed for the first time. By constructing the low‐impedance sections in Koch‐shaped geometry, the passband performance of the Hi‐Lo microstrip low‐pass filter enhanced greatly. The excellent passband performance is mainly due to the gradual changes of the steps of the fractal‐shaped microstripline, thus to provide weak current discontinuities. To verify the proposed method, low‐pass filter prototypes of different iteration orders are designed, fabricated, and measured, and the measurement results show that the maximal sidelobe level of the passband return loss is reduced from −17.8 to −28.6 dB, and the other performances are not changed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2577–2579, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22774
Microwave analysis of a 70 nm InGaAs pHEMT on InP substrate for nanoscale digital IC application
Authors: Ahlawat Anil , Pandey Manoj , Pandey Sujata 
Published: July 2007

AbstractA new charge‐control model for the microwave characteristics of an AlGaAs/InGaAs/InP HEMT of 70 nm gate length has been developed. The threshold voltage has been modified by the inclusion of mole fraction and thermal effects. The current voltage characteristics have been obtained and compared with the 70 nm gate length device. In order to avoid short‐channel effects, an aspect ratio (gate length to gate to channel distance) larger than 5 is maintained in the analysis. The small‐signal microwave parameters (gm, gd) have also been evaluated. 2‐D analysis has been carried out in the saturation region. The unity gain cut‐off frequency of the order of 220 GHz is obtained at a gate length of 70 nm. Device parameters so obtained were used to calculate the hemt Y‐parameters. The Y‐parameters hold from the threshold region to the edge of saturation. The unilateral gain so obtained from the Y‐parameters yield a closer fit to the numerical model. All the results have been compared with the experimental data and show a close agreement and the validity of our model. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2462–2470, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22779
An omnipotent Smith chart for lossy nonreciprocal transmission lines
Authors: Wu Yongle , Huang Haiyu , Liu Yuanan 
Published: July 2007

AbstractThe analysis of lossy nonreciprocal transmission line (LNTL in short), which is the most general case in transmission line problems, is presented in this article. By modifying the expression of input impedance, we get a novel graphical tool called omnipotent Smith chart (OSC) for solving LNTL problems. Including all the previous introduced Smith Charts such as the standard Smith chart, the generalized Smith chart for lossless nonreciprocal lines, the generalized Smith chart for lossy reciprocal lines, etc., OSC is omnipotent for different kinds of transmission lines. An OSC can be easily generated using Matlab or Java for applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2392–2395, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22783
Electromagnetic metamorphosis: Reshaping scatterers via conformal anisotropic metamaterial coatings
Authors: Ozgun Ozlem , Kuzuoglu Mustafa 
Published: July 2007

AbstractWe introduce a new technique (in the context of time‐harmonic electromagnetic scattering), which renders an object (or scatterer) to be perceived as if it has a different shape, irrespective of the location of the observer. This is achieved through the usage of an anisotropic metamaterial layer, which is designed as conformal to the surface of the scatterer by employing the concept of coordinate transformation. We report some numerical results for finite element simulations of two‐dimensional anisotropic metamaterial coatings. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2386–2392, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22784
Numerical aspects in the analysis of infinite regular and random helix arrays
Authors: Meiners Christian , Jacob Arne F. 
Published: July 2007

AbstractThis contribution focuses on a scattering description of infinite arrays of small metallic helices. The latter are assumed to scatter like dipoles. A numerical approach is extended to account for the influence of the lattice with more precision. This is done by a simple extrapolation scheme, which accelerates the convergence of the arising series. For regular arrays, a comparison with a commercial software tool reveals a good agreement, at least as long as the distance between the particles is large enough for the dipole assumption to be valid. This also applies at resonance, the most critical case. The effects on random arrays are also investigated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2609–2613, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22788
Nonsurgical method of detection of cancer using microwaves
Authors: Lonappan Anil , Bindu G. , Thomas Vinu , Jacob Joe , Rajasekaran C. , Mathew K. T. 
Published: July 2007

AbstractThis communication presents a novel method of detection of cancer cells in lymph based on the measurement of the dielectric properties at microwave frequencies. The microwave measurements were performed by rectangular cavity perturbation method in the S‐band of microwave frequency with the lymph samples from healthy persons as well as from cancerous patients. It is noticed that a remarkable change in the dielectric properties of cancerous samples with the normal healthy samples and these measurements were in good agreement with clinical analysis. This measurement technique is simple and the cannulation of lymph from persons is least painful and nonsurgical in nature. These results prove an alternative in‐vitro method of diagnosing onset cancer abnormalities using microwaves without surgical procedure. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2559–2561, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22792
A 0.18 μm CMOS single‐balanced mixer with LO cancellation for MB‐OFDM UWB direct conversion receiver applications
Authors: Park Bonghyuk , Lee Seungsik , Hong Songcheol , Choi Sangsung 
Published: July 2007

AbstractThis article presents an effective methodology for designing a CMOS single‐balanced down conversion mixer with LO cancellation for MB‐OFDM UWB direct‐conversion receiver. The most crucial drawback of single‐balanced mixer; LO feedthrough is overcome by employing BPF technique for multi‐channel LO signal. The proposed single‐balanced mixer is implemented with 0.18 μm CMOS technology and it operates from 3 to 5 GHz frequency range. The measurement result shows that LO signal amplitude is less than IF signal, the IIP3 is 1 dBm at 4‐GHz band, and the current consumption is 6 mA. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2555–2558, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22793
RETRACTED: Planar rectangular split ring shape band‐pass structures
Authors: Tseng Jan‐Dong , Chang Wei‐Geo 
Published: July 2007

AbstractA planar rectangular split ring shaped band‐pass structure is proposed and analyzed by coupled line equivalent circuit instead of commonly used LC resonator circuit. The derived results were then used to design two‐ and three‐cascaded rectangular split ring shape structures. Two prototypes were both designed at center frequency at 2.45 GHz, simulated by microwave simulators: IE3D and microwave office, and fabricated on FR‐4 substrate. The simulated and experimental results show good agreement within 0–10 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2520–2523, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22794
A noveltime‐domain technique for nonparaxial ultra short optical pulses
Authors: Masoudi Husain M. 
Published: July 2007

AbstractA novel nonparaxial technique based on Pade approximant for modeling ultra short optical pulses has been discussed and verified. The characterization of the technique shows excellent performance in terms of accuracy, efficiency, and stability where the traditional paraxial time‐domain beam propagation method failed to achieve. The new method is very useful and efficient for modeling long optical pulse interaction when compared to the classical finite‐difference time‐domain. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2481–2486, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22796
Compact broadband dual‐frequency slot‐loaded rectangular microstrip antenna with ground plane meandering slots and stacking
Authors: K. Usha Kiran , Yadahalli R. M. , M. Vani R. , Farida Sara F. , Hunagund P. V. 
Published: July 2007

AbstractIn this article, compact broadband dual‐frequency slot‐loaded rectangular microstrip antenna with meandering slots in the ground plane and their stacking is presented. Here, first a single‐layer slot‐loaded rectangular microstrip antenna with three identical narrow meandering slots in the ground plane (SLRMSA‐MSGP) has been studied. By meandering slot‐loaded rectangular microstrip antenna with meandering slots in the ground plane, dual frequency compact broadband operation has been achieved. The antenna resonates for dual frequency with a size reduction of 50 and 30% having an enhanced bandwidth of 12 and 4.5%, respectively. Again to further enhance the bandwidth, a meandered rectangular patch (using three slits) is stacked on the single‐layer optimized SLRMSA‐MSGP with meandering slits of the top patch in opposite‐phase with the ground plane meandering slots. Here, the lower frequency of the antenna has been further slightly lowered with a significant enhancement in the bandwidth. Using this configuration, the antenna resonates for compact dual frequency with a size reduction of 54 and 32.3% having an enhanced bandwidth of 16.8% and 3% respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2477–2481, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22797
All optical linearization technique of DFB‐LD based on optical injection locking for RoF system
Authors: Hong Moon‐Ki , Han Sang‐Kook 
Published: July 2007

AbstractA novel all optical linearization technique using optical injection locking is proposed for radio‐over‐fiber system. When slave laser diode (SLD) is operated under injection locking condition, the modulated optical signals from master laser diode (MLD) are suppressed by residual amplitude modulation suppression. However, these signals are not completely suppressed by imperfection of residual amplitude modulation suppression and remained in the cavity of SLD. By appropriately controlling the phase and amplitude of these signals to have out‐of phase and the same magnitude condition compared with those of direct modulated optical signals from SLD, the efficiency of linearization of DFB‐LD can be more enhanced by optical cancellation in the SLD. By using the proposed technique, 17 dB enhancement of carrier‐to‐interference ratio was experimentally achieved up to frequency response of DFB‐LD compared with that of free‐running case. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2403–2406, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22800
Dual wideband sleeve dipole type antenna for S‐DMB and 2.4/5 GHz WLAN
Authors: Kim S. M. , Yoon K. S. , Yang W. G. 
Published: July 2007

AbstractA printed dual‐band antenna for S‐DMB and WLAN is proposed. The proposed antenna shows wide impedance bandwidths as well as good radiation patterns and high antenna gains, despite very small volume. The frequency ratio of 2 GHz frequency band and 5 GHz frequency band can be adjusted by variation of the center arm and side arms in the proposed antenna. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2440–2443, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22802