bluuebunny/crossref_metadata_2025_split huggingface dataset:
A K‐band low‐noise amplifier in 0.18‐μm CMOS technology for SUB‐1‐V operation
Authors: Jin Jun‐De , Hsu Shawn S. H. 
Published: June 2009

AbstractA K‐band low‐noise amplifier (LNA) was realized in a standard 0.18‐μm CMOS technology. The cascaded common‐source configuration of four stages was adopted for low voltage operation and high gain performance. In addition, the gate‐source transformer feedback technique was employed to achieve a low noise figure (NF), which also enabled a single power supply operation and without using any resistive components. Under a supply voltage of only 0.8 V and a DC power consumption PDC of 12.6 mW, the measured gain and NF are 14.5 and 5.3 dB at 21 GHz, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2202–2204, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24530
Using selective Zn diffusion to enhance the performance of the photodiode in InP/InGaAs PD/HBT integration
Authors: Huang Shou‐Chien , Huang Wei‐Kuo , Hsin Yue‐Ming , Shi Jin‐Wei 
Published: June 2009

AbstractIn this work, the selective Zn diffusion process is applied in the conventional p‐i‐n PD/HBT structure to improve the PD's performance. Without Zn diffusion, the top‐illuminated PD need higher reverse bias to delay the screen effect. With Zn diffusion, the −3 dB bandwidth can be extended to higher frequency at middle and high photocurrent under lower reverse bias. Even under higher reverse bias, it still has better performance at higher photocurrent. The −3 dB bandwidth at 9 mA output current extends from 5 to 10.7 GHz at reverse bias of 1 V and from 4.7 to 11.5 GHz at reverse bias of 2 V. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2200–2202, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24531
Design of a linear nonuniform CPW‐fed slot array with reduced sidelobe levels
Authors: Jacobs J. P. , Joubert J. 
Published: June 2009

AbstractA linear nonuniform CPW‐fed slot array was designed using an iterative procedure. Theoretical and measured highest sidelobe levels of about −17 dB and −16 dB, respectively, were achieved. These are substantially lower than that of previously reported arrays of this sort, validating the accuracy of the approximate method—permitted by the electrically thin substrate—used to calculate mutual coupling. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2175–2178, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24532
Analysis and design of compact third‐order intermodulation generation circuits
Authors: Park Hyun‐Chul , Jung Sung‐Chan , Lim Kyung‐Hoon , Kim Min‐Su , Kim Hyungchul , Park Cheon‐Seok , Yang Youngoo 
Published: June 2009

AbstractIn this article, we analyzed and designed miniaturized third‐order intermodulation distortion (IM3) generation circuits. An antiparallel Schottky diode pair was adopted for nonlinearity generation. A reflective configuration using a 90° hybrid coupler was employed to acquire a pure IM3 signal at the output. The fundamental signal at the output was automatically suppressed below the IM3 level using a reflective load optimized for the fundamental impedance of the antiparallel diode pair. The IM3 generation characteristics were fully analyzed using the Volterra series under a weak nonlinear assumption. A new optimum matching condition of the reflective load for the perfect fundamental cancellation was derived. A miniaturized 12 × 14 mm2 IM3 generator was designed and implemented for the 2.16 GHz band, based on the analysis results. The output performance measured for the implemented IM3 generator matched the calculated results. The IM3 generator showed excellent fundamental cancellation characteristics and had a wide operational range for the input signal level. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2137–2140, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24535
Compact wideband bandpass filters using rhombus‐shaped triple‐mode resonator
Authors: Wong Sai Wai , Zhu Lei 
Published: June 2009

AbstractA novel compact wideband bandpass filter is proposed using a stub‐loaded triple‐mode resonator (TMR) with rhombus configuration. This TMR is formed by shunt‐loading a stepped‐impedance stub at the center of a half‐wavelength resonator. As this TMR is driven in its two sides by two identical quarter‐wavelength parallel coupled lines, a wideband passband with a fractional bandwidth 80% is achieved. With the help of a two‐section stub, two transmission zeros are excited near the lower and higher cut‐off frequencies so as to sharpen the roll‐off skirt of the passband. A two‐stage filter is finally designed to enhance the rejection skirts. Measured results for the two fabricated filters confirm the predicted results with sharp rejection skirt and wideband performances. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2107–2109, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24536
An efficient finite element‐boundary integral method solving electromagnetic scattering problems
Authors: An Xiang , Lü Zhi‐Qing 
Published: June 2009

AbstractThe “conventional” finite element‐boundary integral (FE‐BI) method suffers from two major drawbacks, one is the huge computer resources required by the dense BI submatrix; the other is the slow convergence rate of the resulting linear system of equations. In this article, both the drawbacks are investigated. First, the integral equation fast Fourier transform (IE‐FFT) algorithm with a Gaussian interpolation scheme is employed to deal with the BI part. Second, an effective and simple preconditioner is developed for solving the matrix equation obtained from FE‐BI method. Numerical results show that the proposed preconditioner can dramatically speed up the convergence of the FE‐BI system, whatever the combined field integral equation (CFIE), the electric field integral equation (EFIE), and the magnetic field integral equation (MFIE) are employed on the truncation boundary. Some examples are given to demonstrate the accuracy and efficiency of the method. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2065–2071, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24538
A 5‐GHz low‐phase noise CMOS VCO with swing boosting technique
Authors: Liu Junhua , Liao Huailin , Huang Ru 
Published: June 2009

AbstractA 5‐GHz CMOS VCO with improved phase noise is proposed in this article. A gate voltage boosting technique is realized with only one inductor. The proposed VCO is fabricated in 0.18 μm CMOS process, and the measured phase noise is −122.7 dBc/Hz@1 MHz when operates at 4.936 GHz, with a power dissipation of 5.28 mW from 1 V supply. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2061–2064, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24539
Double dipole antenna for dual‐band wireless local area networks applications
Authors: Steyn Johanna M. , Odendaal Johann W. , Joubert Johan 
Published: June 2009

AbstractA double‐dipole antenna design is proposed for wireless local area network (WLAN) applications. Two parallel dipoles are used to facilitate operation in both the standard WLAN frequency bands (IEEE 802.11b and IEEE 802.11a) simultaneously. The lower band dipole is rhombus shaped and radiates above a planar ground plane, whereas radiation from the rectangular higher band dipole is directed through the use of a passive director. The antenna is characterized in terms of impedance bandwidth, gain and radiation patterns through simulations and measurements. The design addresses the need for dual‐band operation, whereas delivering directional radiation patterns with adequate gain, low cross‐polarization, and good front‐to‐back ratio. The 2.4/5 GHz WLAN bands are covered with an impedance bandwidth of 17.8 and 26.4%, respectively, for a VSWR better than 2:1. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2034–2038, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24540
Extraction of CAD‐compatible statistical nonlinear models of GaAs HEMT MMICs
Authors: Centurelli Francesco , Di Martino Alberto , Scotti Giuseppe , Tommasino Pasquale , Trifiletti Alessandro 
Published: June 2009

AbstractIn this article, a statistical nonlinear model of GaAs HEMT MMICs based on standard CAD library models is presented. A previously developed extraction procedure is used to determine model parameters. Extraction and CAD implementation of the model in 1–50 GHz frequency range provide validation of both the statistical model and the extraction procedure. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2163–2166, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24543
Compact tunable periodically LC loaded phase shifter using left‐handed transmission line
Authors: Sheng Su , Wang Peng , Ong C. K. 
Published: June 2009

AbstractIn this article, a compact tunable periodically LC loaded phase shifter using left‐handed transmission line is presented. The unique nature of left‐handed transmission line metamaterials enables reduced size, compared to conventional loaded line phase shifters realized as right‐handed transmission lines. The phase shifter based on four unit cells provides 0°–280° continuous phase shift at 7.2 GHz from 0 to 6 V. Measured figure of merit is 78°/dB using the highest insertion loss. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2127–2129, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24544
Linearity enhancement of analog optical transmitter using gain saturated reflective semiconductor optical amplifier
Authors: Piao Yin‐Xing , Won Yong‐Yuk , Han Sang‐Kook 
Published: June 2009

AbstractWe propose a new linearization scheme in optical external modulator employing high‐pass filter characteristic of a gain saturated reflective semiconductor optical amplifier for an analog optical transmission system. The proposed scheme is based on power level relation between fundamental signal and IMD3 signal when a radio‐frequency tone is modulated, using an optical modulator at linearity region of transfer curve. Based on the proposed idea, a linearized optical transmitter module is implemented and evaluated. The proposed scheme is demonstrated and verified using a small scale test‐bed. Both carrier‐to‐interference ratio and spurious‐free dynamic range are improved. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2100–2103, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24545
Frequency selective surface with dual band switchable reflection and transmission characteristics
Authors: Munir A. , Fusco V. 
Published: June 2009

AbstractA pin diode‐loaded active doubly periodic flat strip FSS is shown to act as a dynamic screen. It is shown that by means of d.c. bias control, we can utilize the screen in, (1) transmission mode as a dual band electromagnetic shutter, or with the inclusion of a ground plane in reflection mode, as (2) a dual band refection canceller, (3) an amplitude shift keying (ASK) spatial modulator. The properties of the FSS are characterized using a specially designed parallel plate waveguide simulator that permits normal incidence excitation of the FSS under test. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2059–2061, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24547
Environmentally stable nonlinear optical polarization switching by using a nonreciprocal all‐optical circuit
Authors: Kishi Naoto , Ehsan Ul Islam 
Published: June 2009

AbstractWe proposed and demonstrated a stable nonlinear optical polarization self‐switching based on nonreciprocal nonlinear phase shift induced by self‐phase modulation in optical fiber. The polarization self‐switching was achieved at input power levels of around 10 mW in a nonreciprocal circuit using Faraday rotator mirrors. This nonlinear polarization switching is quite stable against polarization fluctuation caused by environmental perturbation. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2056–2059, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24548
PA and LNA for millimeter‐wave WPAN using 90 nm CMOS process
Authors: Kang Min‐Soo , Kim Bong‐Su , Byun Woo‐Jin , Kim Kwang‐Seon , Oh Seung‐Hyeub , Pinel Stephane , Laskar Joy , Song Myung‐Sun 
Published: June 2009

AbstractWe present the design and fabrication of power amplifier (PA) and low noise amplifier (LNA) in 60 GHz using 90 nm CMOS process. Both of them have three stages topology. We obtained small signal gain of 21 dB, P1dB of 4 dBm, and input/output return losses of <−9 dB in PA. We also obtained small signal gain of 25 dB, noise figure of <7 dB, P1dB of 1.5 dBm, input/out return losses of <−8 dB in LNA. The die sizes of PA and LNA are 1.1 × 0.8 mm2 and 0.59 × 0.78 mm2, respectively. Both sizes contain the RF pads and bias pads. Especially, the size of LNA is reduced by using hairpin type matching structure. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2029–2032, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24549
Tunable dual‐band bandpass filter for WLAN applications
Authors: Girbau David , Lázaro Antonio , Martínez Esther , Masone Diego , Pradell Lluís 
Published: June 2009

AbstractThis article proposes the design of tunable dual‐band filters for multiband multistandard systems, specifically for wireless local‐area network applications. The two main goals are to provide frequency tunability in the second band while maintaining the first band fixed and to obtain a structure capable of offering a ratio between the second and first passband center frequencies larger than 2. To this end, a capacitively loaded stepped‐impedance resonator is proposed for integration in dual‐band filters. A detailed analysis of the resonator is provided. A filter has been designed to validate the concept. It demonstrates operability in wireless local‐area network frequency bands, with a fixed first band at 2.45 GHz and a second band which can be tuned between 5.75 GHz and 5.25 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2025–2028, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24550
Multiband ladder‐shaped monopole antenna for digital television and wireless communications
Authors: Liu Wen‐Chung , Huang Der‐Lun 
Published: June 2009

AbstractA multiband monopole antenna covering DTV and several popular wireless communications was presented. The antenna fed by a microstrip line comprises a ladder‐shaped patch and a notched ground plane. By precisely choosing the dimensions of both the patch and the ground, dual wide continuous impedance bandwidths of 880 MHz (0.51–1.39 GHz) and 1.66 GHz (2.11–3.77 GHz) applicable for multiband wireless operation can be easily achieved. Also, the monopole‐like type of radiation patterns and the average gains of about 0.1 and 4.5 dBi, respectively, over the lower and upper operating bands have been obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2124–2127, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24555
Design of a stopband‐improved UWB filter using a pair of shunt and embedded open stubs
Authors: Weng Min‐Hang , Kuan Hon , Chen Wen‐Lang , Ye Chang‐Sin , Su Yan‐Kuin 
Published: June 2009

AbstractIn this letter, an ultrawideband (UWB) bandpass filter (BPF) with an improved stopband has been proposed. The proposed UWB BPF, having a lower passband of 3.5–5.2 GHz and a higher passband of 6.5–9.7 GHz, mainly comprises the parallel‐coupled lines and slot‐line resonator. A wide stopband of the proposed BPF from 10 to 20 GHz can be achieved by using a pair of shunt and embedded open stubs. The proposed UWB BPF is designed, fabricated, and measured. Good agreement with the electro‐magnetic simulation and measurement is demonstrated. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2121–2124, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24556
Full‐wave analysis of antenna‐array mutual coupling using the FETI‐DEPM algorithm
Authors: Li Yu‐Jia , Jin Jian‐Ming 
Published: June 2009

AbstractThe electromagnetic dual‐primal finite‐element tearing and interconnecting (FETI‐DPEM) algorithm is applied to the three‐dimensional (3D) full‐wave analysis of mutual coupling between antenna arrays mounted on a large platform. For large antenna arrays with repeated unit cells, the geometrical repetition is fully utilized to reduce the computation time and memory requirements. For general antenna arrays without geometrical repetitions, the full‐wave simulation using the FETI‐DPEM algorithm is accelerated through parallel computation. The numerical scalability of the algorithm ensures a high‐parallel efficiency on both shared‐ and distributed‐memory systems. Curvilinear tetrahedral elements, higher‐order vector basis functions, and port boundary conditions are employed in the finite‐element formulation to accurately model the geometry and the fields in antennas and feeds. Simulations of antenna arrays on large platforms using the FETI‐DPEM algorithm are carried out to demonstrate the efficiency and capability. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2088–2093, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24558
Hybrid approach for efficient calculation of the parallel‐plate impedance of lossy power/ground planes
Authors: Rimolo‐Donadio Renato , Brüns Heinz‐D. , Schuster Christian 
Published: June 2009

AbstractTwo different approaches to calculate analytically the impedance of rectangular power planes of printed circuit boards and package structures (parallel‐plate impedance) are discussed, namely, the cavity resonator model and the radial waveguide approach. Both methods are compared and it is shown that they can be combined to improve the efficiency of the computation over a broad frequency range. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2051–2056, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24559
Negative index metamaterials composed of triangular open‐loop resonator and wire structures
Authors: Zhu Cheng , Ma Jing‐Jing , Chen Liang , Liang Chang‐Hong 
Published: June 2009

AbstractThis article presents a new type of left‐handed materials composed of two kinds of triangular open‐loop resonators (TOLRs) and wires. Parameter retrieval algorithm, prism simulations, and the transmission experiments all have been carried out to validate the left‐handed characteristic of TOLR‐wire structures. The negative refraction indices obtained by prism simulations are in good agreement with the retrieval results. Besides, the transmission experiments show that each transmission peak does appear in each negative index frequency region, which confirm the left‐handed characteristic of those two kinds of structures. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2022–2025, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24561
Analytical shielding effectiveness model of metal foams for high frequency
Authors: Losito Onofrio 
Published: June 2009

AbstractThe applications of metal foam in the last years continues to grow up in terms of research and application even in electromagnetic environment. An analytical 3D model of metal foams is developed and discussed in this article to characterize the electromagnetic shielding behavior, showing good agreement results with this model, some prototype of this model, and experimental measurements of metal foams. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2189–2193, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24563
A theoretical basis for Doherty amplifier bias control based on drain current characteristics
Authors: Smith Karla J.I. , Eccleston Kimberley W. , Gough Peter T. , Mann Stephen I. 
Published: June 2009

AbstractThis article introduces a gate bias control scheme for Doherty amplifiers, based on the measured gate‐voltage to drain‐current transfer characteristics of the FETs used, and their ideal fundamental output currents. An amplifier was realized at 800 MHz, and achieved over 35% drain efficiency from 8–14 dBm input power. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2152–2156, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24565
Optimization and modeling for MOS varactors in 65 nm low‐power mixed‐signal/radio‐frequency technology
Authors: Chen Chia Chung , Jiang Meshon , Chang Li Ming , Yeh Tzu Jin , Liu Feng Ming , Liu Sally 
Published: June 2009

AbstractCMOS technology scaling opens up the possibility of designing variable capacitors based on a metal oxide semiconductor (MOS) structure with improved tuning range and quality factor. In this work, the high Q‐factor 24 and 21, wide tuning ratio 45% and 36% can be achieved by 65 nm low power technology n+/n‐well and p+/p‐well MOS varactor up to 10 GHz, respectively. Meanwhile, the equivalent circuit model, to model intrinsic and extrinsic parameters of MOS varactor, also have demonstrated that parasitic resistance is a main issue to dominate Q‐factors, and the measured flicker noise result of MOS varactor is directly dependant on gate leakage current. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2119–2121, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24567
Implementation of parallel GMRES(m) FFT method for solving large scale electromagnetic problems
Authors: Zhang Ming , Yeo Tat Soon , Li Le Wei 
Published: June 2009

AbstractIn this article, the parallel restarted generalized minimum residual [GMRES(m)] scheme has been implemented to solve large scale multilevel block Toeplitz matrix equations. The parallel fast Fourier transform has been used to accelerate the matrix‐vector multiplications in the iterative solver. The numerical results of electromagnetic scattering by cylindrical wire arrays demonstrate the accuracy and efficiency of the parallelization scheme. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2084–2087, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24569
A compact slot‐coupled dual‐band RFID tag antenna
Authors: Zeng Rui‐Hua , Chu Qing‐Xin 
Published: June 2009

AbstractA slot‐coupled dipole antenna is presented for dual‐band passive radio frequency identification (RFID) tag application. A structure using a slot‐coupled feed is explored to achieve dual‐band operation. The proposed antenna satisfies the −10 dB return loss characteristics from 840 to 940 MHz (11%) for ISO 18000‐6 and from 2.26 to 2.56 GHz (12%) for ISO 18000‐4 applications, respectively. The simulated and measured return loss results are in good agreement. Also reasonably good radiation characteristics are obtained for 900 MHz and 2.45 GHz RFID bands. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2046–2048, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24571