bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear embedding and de‐embedding techniques for large‐signal fet measurements
Authors: Vadalà Valeria , Avolio Gustavo , Raffo Antonio , Schreurs Dominique M.M.‐P. , Vannini Giorgio 
Published: September 2012

AbstractThe manuscript presents a comparison between two nonlinear procedures oriented to the investigation of the intrinsic I/V dynamic characteristics at a transistor's current‐generator plane. These approaches, without the need of modeling device trapping and thermal effects, allow to obtain information at the current‐generator reference plane that is more strictly linked to the device performance in terms of output power and efficiency. Experiments carried out on a 800‐μm GaN HEMT are reported. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2835–2838, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27169
A novel bias circuit with temperature and process compensation for RFIC
Authors: Lee Jeong‐Cheol , Kim Young‐Woong , Shin Jin‐Ho , Kim Bumman 
Published: September 2012

AbstractTemperature and process variations have become key issues in design of integrated circuits using deep submicron technologies.In the RF front‐end circuitry, these characteristics must be compensated to maintain acceptable performance across all process corners and throughout the temperature variations. This article proposes a new bias circuit technique to compensate the variations by adding a single NMOS to the normally bias circuit. A 2.4GHz and 5.2GHz LNAs with the proposed bias circuit have the power gain variation (S21) of only 0.3 dB for the −40 to 85°C temperature range in a 65nm RF CMOS process. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2694–2697, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27170
Full wave and asymptotic computation of coupling loss between antennas on aircraft
Authors: Legendre Jean‐Francois , Bréluzeau C. 
Published: September 2012

AbstractThis article presents how to compute the coupling loss between a transmitter and a receiver with full‐wave electromagnetic software.An analytical method based on asymptotic spherical diffraction is proposed, and results of coupling loss between antennas on an un‐named aerial vehicle are compared. Extension to other aircraft sizes is discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2874–2878, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27171
Dual wideband and low cross‐polarization printed dipole antenna with h‐slot for WLAN applications
Authors: Li Xin , Wang Ya‐Fang , Shi Xiao‐Wei 
Published: September 2012

AbstractA novel dual wideband and low cross‐polarization printed dipole antenna for wireless local area network applications is proposed in this article.Two H‐slots are etched symmetrically on the radiating arms which produce the dual band characteristic. By using the tapered U‐shaped structures, good wide band impendence matching can be achieved without additional matching circuit, and then dual wideband can be obtained conveniently. Based on this concept, a prototype of this antenna has been designed, fabricated, and measured. The experimental results show that the proposed antenna yields two operating bands of 2.17–2.95 GHz and 5.05–6.46 GHz with −10 dB return loss, which can cover all the wireless local area network operating bands. Moreover, the radiation patterns are almost omnidirectional in the H‐plane and low cross‐polarization levels are observed in both the E‐ and H‐plane. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2846–2848, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27173
Novel dual‐band bandpass filters using stub‐loaded short‐ended resonators
Authors: Gao Li , Zhang Xiu Yin 
Published: September 2012

AbstractThis article presents two dual‐band bandpass filters (BPFs) using short‐ended resonators with high selectivity.The properties of the proposed stub‐loaded short‐ended microstrip resonators are analyzed theoretically. In case of uniform short or open stubs, the first two resonant frequencies can be easily controlled within a wide frequency range. Thus, they can be utilized to design dual‐band BPFs with flexible passband frequencies. For demonstration, two dual‐band BPFs have been implemented. Comparisons of the measured and simulated results are presented to verify the theoretical predications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2771–2774, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27177
A novel tri‐band multiple input multiple output antenna with improved bandwidth and isolation
Authors: Babu K. Jagadeesh , Krishna K. Sri Rama , Reddy L. Pratap 
Published: September 2012

AbstractA novel multislot patch antenna operating from 3.5–5.9 GHz is proposed for a two element multiple input multiple output (MIMO) system. The developed system resonates at the tri‐band of frequencies 2 GHz, 4.2 GHz, and 5.5 GHz, giving an impedance bandwidth of 51% at 10 dB return loss and a reduced mutual coupling less than −50 dB. The enhancement of the bandwidth and the reduction of the mutual coupling are achieved using the reduced ground plane and unique symmetric slot structure. The proposed MIMO system can be used for high speed wireless computer local area networks and WiMAX applications. The measured results are found in good agreement with the simulation results. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2766–2770, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27178
Printed circularly polarized wire antennas with DC grounded stub
Authors: Wang Song , Mak Ka Ming , Lai Hau Wah , So Kwok Kan , Xue Quan , Liao Guisheng 
Published: September 2012

AbstractTwo new printed circuit board types double‐folded inverted‐L antennas (DFILAs), which are the horizontal printed DFILA and the vertical printed DFILA, have been proposed.By taking advantage of the printed circuit technologies, the manufacturing processes of the DFILAs can be simplified. The proposed antennas are low profile, lightweight, and simple in structure. Both antennas perform right‐hand circular polarization with center frequency of 2.4 GHz. Both antennas have impedance bandwidths of over 7% (S11<−10dB) and axial ratios of 2.5% (< 3dB). The gains of the two antennas are higher than 6.4 dBi. One of the designs has a simple feeding network with a DC grounded stub, which can improve the impedance matching and provide static discharges for the DFILA. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2719–2725, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27181
Modeling a SIW filter with IRIS windows using equivalent circuits
Authors: Tlaxcalteco‐Matus Miguel Angel , Torres‐Torres Reydezel 
Published: September 2012

AbstractA model and parameter extraction method for a substrate integrated waveguide (SIW) filter is presented. The proposed approach is derived from an analysis of full‐wave simulations, allowing to obtain the equivalent circuit parameters for the iris. The accuracy of the method is demonstrated through a careful model–experiment correlation, allowing the correct representation of the SIW filter over the complete useful bandwidth. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2865–2868, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27183
Broadband bandpass filter using open complementary split ring resonator based on metamaterial unit‐cell concept
Authors: Afrooz Kambiz , Abdipour Abdolali , Martín Ferran 
Published: September 2012

AbstractIn this article, a compact, wideband, and sharp rejection response bandpass filter based on metamaterial unit‐cell concept is proposed. A series LC resonator using an interdigital capacitor and two meanders is designed, and an open complementary split ring resonator is used to realize the parallel LC resonator. Due to parasitic elements, achieving a pure series LC resonator has some difficulty. However, these parasitic elements can add two resonances more than conventional filters based on the metamaterial unit‐cell. A design procedure based on a simple equivalent circuit is introduced. A compact bandpass filter at 1.475 GHz, with 94% fractional bandwidth, and an attenuation slope with 85.98 and 35.628 dB/GHz in the lower and upper transition bands, respectively, is designed and fabricated. The measured results are in good agreement with the full‐wave electromagnetic simulations inferred by means of Agilent Momentum. The filter has very small size, that is, 0.341λg × 0.1033λg, where λg is the guided wavelength at the filter central frequency. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2832–2835, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27185
Reduced microstrip slot multiband antenna with A U‐shaped resonator for wlan applications
Authors: Flores‐Leal R. , Jardon‐Aguilar H. , Tirado‐Mendez A. , Acevo‐Herrera R. 
Published: September 2012

AbstractThe development of two reduced microstrip slot antennas with a U‐shaped resonant configuration is presented. The additional resonator is located inside the slot and is designed to perform dual band operation, covering the 2.4 GHz and 5.8 GHz WLAN frequency bands. The main goal of the antenna design is to get the optimum size reduction without significant degradation of electrical characteristics compared to a similar antenna reported in literature. The antenna implementation was done using low cost substrates. A size reduction of 84% was got by using a dielectric constant substrate of 10. Simulation and experimental results are presented for both antennas, showing close convergence. Their radiation patterns have quasi‐omnidirectional behavior useful for WLAN applications. Both antennas have small size suitable for mobile applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2684–2689, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27187
Double channel triple band MIMO antenna with high isolation performance and pattern diversity for wireless applications
Authors: Rezaeieh Sasan Ahdi , Pouyanfar Negin 
Published: September 2012

AbstractA miniaturized monopole antenna with filtering properties is presented.An S‐shape double channel compact multi‐input multi‐output antenna with high isolation performance for DSC‐1800, PCS‐1900, WiMax 3.5 GHz, and WLAN applications is presented in this letter. A total impedance matching bandwidth of larger than 40% for three operating bands is attained through measurements. S‐shape structure has been introduced to reduce the overall width of the diversity configuration to 50 mm. The isolation between the two ports is greater than 24 dB and the envelope correlation is less than 0.0058 over all three bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2689–2691, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27189
Transmitter front‐end with a new wideband active balun in 65‐nm CMOS technology
Authors: Lin Kuan‐Ting , Chen Hsien‐Ku , Wang Tao , Lu Shey‐Shi 
Published: September 2012

AbstractA 2.4 GHz transmitter front‐end with a wideband active balun is proposed.The wideband active balun is able to work ideally by adopting a resistive compensation technique, which balances the gain of the differential input. In addition, a variable‐gain preamplifier driver with a dynamic range of 18 dB is utilized for the autogain loop control feature. The proposed wideband active balun only occupies 15 × 27 μm2, which is profoundly small compared with conventional baluns and is promising in the differential to single signal conversion in wideband applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2868–2871, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27190
Coplanar waveguide fed monopole antenna with dual‐band operations using square‐shaped slot on conductor‐backed plane
Authors: Moosazadeh Mahdi , Esmati Zahra 
Published: September 2012

AbstractA compact and simple coplanar waveguide fed (CPW‐fed) monopole antenna with dual‐band applications is proposed. The main features of the proposed antenna are the compact dimensions and band‐operating characteristics that are obtained without modifying the radiator or the ground plane. The antenna consists of a square patch as radiator, a partial CPW‐ground plane, and a slotted conductor‐backed plane. Impedance matching for dual‐band operations is achieved by a pair of mirror square‐shaped slots at the conductor‐backed plane. The proposed antenna has a small size of 15 × 15 × 0.8 mm3, and measured to cover the bandwidth for 5.2 GHz (5150–5350 MHz) and 5.8 GHz (5725–5825 MHz) bands for IEEE 802.11a and also X‐band (8–12 GHz) and provides suitable radiation pattern and antenna gains for the operating bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2838–2841, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27191
A clear‐cut understanding of the current‐gain peak in HEMTs: Theory and experiments
Authors: Crupi Giovanni , Raffo Antonio , Schreurs Dominique M. M.‐P. , Avolio Gustavo , Caddemi Alina , Vannini Giorgio 
Published: September 2012

AbstractThe aim of this article is to provide a clear‐cut understanding of the origin of the current‐gain peak (CGP) affecting the microwave behavior of high electron mobility transistors (HEMTs). This effect consists of a sudden increase of the magnitude of the short circuit current‐gain at a given value of the frequency. The present study demonstrates that the CGP can be attributed to the resonance associated to the transition from a capacitive to an inductive behavior of the open circuit output impedance, as confirmed through an extensive experimental analysis. In particular, the CGP is analyzed in HEMT devices based on both GaAs and GaN technologies and its appearance is investigated with respect to the gate width, bias condition, and ambient temperature. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2801–2806, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27192
A multiband film type inverted F‐antenna for GSM, DCS, PCS, USPCS, and WCDMA bands
Authors: Park Sung‐Il , Lee Jahyeon 
Published: September 2012

AbstractA novel and simple design of a film type inverted F‐antenna for global system for mobile (GSM), digital cellular system (DCS), personal communication system (PCS), US personal communication system (USPCS), and wideband code division multiple access (WCDMA) bands is proposed. The obtained impedance bandwidths reached 87 (880–967) MHz and 451 (1710–2162) MHz in the GSM, DCS, PCS, USPCS, and WCDMA bands. For multiband operation, a modified meander line structure with L‐shaped short pin was used. The measured peak antenna gains for the operating frequencies were 3.18–4.24 dBi. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2757–2762, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27195
Jitter in analog optical links using a quadrature‐biased Mach–Zehnder modulator
Authors: Shin Jong‐Dug , Yoon Young‐Min , Park Jaehee , Chen Ray T. 
Published: September 2012

AbstractCharacteristics of jitter have been investigated in a 10‐GHz analog optical link using a quadrature‐biased Mach–Zehnder modulator followed by an erbium‐doped fiber amplifier (EDFA) and a PIN photodiode. For the case of low optical input power, jitter varies inversely with input power, indicating the thermal noise limited characteristic. For high input optical power, jitter saturates at a minimum for different RF power levels for the configuration without EDFA. For the configuration using EDFA, jitter is also inversely proportional to EDFA gain but shows different minima for different input optical power with output power fixed by adjusting EDFA gain because of amplified spontaneous noise noise. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2725–2727, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27196
A small printed GPS/GLONASS antenna for mobile phones using coupling strips
Authors: Ahn Jungho , Kim Seunghwan , Lee Jaeho , Kim Austin S. , Kim Youngsik 
Published: September 2012

AbstractThis letter presents a small printed PCB‐embedded antenna for a mobile phone with GPS/GLONASS satellite navigation systems. The proposed antenna consists of a feeding strip, two coupling strips, and two chip capacitors. One end of each of the coupling strips is terminated with a chip capacitor and the other end is connected to the ground. The antenna measures 5 mm × 9 mm, and it is placed at the corner of the ground, which measures 40 mm × 70 mm. The bandwidth with a VSWR of 3:1 covers the GPS/GLONASS operation band. The radiation patterns are similar to those of a dipole antenna. The measured peak gain is 0.2 dBi at the GPS/GLONASS frequency. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2736–2736, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27197
Small circular‐shaped UWB antenna for wireless communication applications
Authors: Naser‐Moghadasi M. , Hafezifard R. , Sadeghzadeh R. A. , Seyyedhatami H. , Torkamani M. 
Published: September 2012

AbstractAn effective method is designed and miniaturized for ultra‐wideband (UWB) antenna in the form of planar monopole of circular shape. The antenna includes of a radiation path and an incomplete ground plane to achieve an UWB impedance matching and improve the high frequency radiation performances. Measured return loss of the printed antenna with this technique is less −10 dB from 3–11 GHz which covers the UWB range usable for multiband orthogonal frequency division multiplexing. Also this antenna has an omnidirectional radiation pattern and very good pattern stability over the operating band. The satisfactory results with such a simple plane and small size make this antenna a practical and profitable candidate for UWB wireless communications applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2885–2888, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27201
A modular approach to design a full three‐way 8 to 18 GHz MMIC active circulator
Authors: Lim Hong Yi , Ng Geok Ing , Ang Kian Sen , Leong Yoke Choy 
Published: September 2012

AbstractA modular approach to design full three‐way active circulator is presented. Derived S‐parameters for the modular design approach illustrates that broadband performance can be achieved with broadband performance modules. A full three‐way 8 to 18 GHz MMIC active circulator was designed and fabricated with broadband feedback amplifiers and broadband 180° hybrids. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2858–2861, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27202
Guiding terahertz wave within a line defect of photonic crystal slab
Authors: Rao Lei , Yang Dongxiao , Hong Zhi 
Published: September 2012

AbstractA terahertz line‐defect waveguide in photonic crystal with a triangular lattice array of cylindrical air holes was fabricated on a silicon slab. Terahertz transmission spectra through this sample were measured and the waveguide with high transmittance exceeding 80% near 0.26 THz was experimentally obtained. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2856–2858, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27203
A 1‐V 1.2‐mW CMOS medradio receiver for biomedical applications
Authors: Cha Hyouk‐Kyu , Yan Dan Lei , Raja M.Kumarasamy , Je Minkyu 
Published: September 2012

AbstractAn ultra‐low‐power low‐voltage 401–406 MHz Medical Device Radiocommunications Service (MedRadio) receiver for continuous wireless communication in biomedical applications is demonstrated using 0.18‐μm CMOS technology. Although using a low‐IF architecture, careful consideration is done for individual block‐level circuit design to minimize the overall power consumption. The receiver chain consists of a complementary current‐reuse LNA, an in‐phase/quadrature folded mixer, an eighth‐order complex bandpass filter, a limiting amplifier chain with RSSI, and a frequency synthesizer with a quadrature VCO. The proposed receiver achieves a gain of over 80 dB, noise figure of 14 dB, image rejection of 32 dB, and phase noise of −106 dBc/Hz at 100 kHz offset while consuming less than 1.2 mW from a 1‐V supply voltage with 1.8 mm2 of core die area. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2821–2825, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27205
Broadband waveguide‐to‐microstrip transition with coupled tuning elements
Authors: Gruszczynski Slawomir , Wincza Krzysztof , Staszek Kamil 
Published: September 2012

AbstractA broadband planar microstrip to rectangular waveguide transition has been proposed. The transition features simple structure which consists of a planar printed circuit inserted into the shorted waveguide. In the proposed design, a wide bandwidth is achieved with the use of additional tuning elements coupled to the exciting printed probe. The proposed concept of the transition has been investigated numerically and verified by measurements of the fabricated element in the X‐band. Further, a successful design of similar transition has been made in millimeter frequency range operating in W‐band. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2787–2789, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27206
Dual band‐notch square monopole antenna with a modified ground plane for UWB applications
Authors: Ojaroudi Nasser , Ojaroudi Mohammad 
Published: September 2012

AbstractThis paper presents a novel small square monopole antenna for UWB applications with dual band‐notch function. By cutting an S‐shaped slot in the ground plane, additional resonance is excited and hence, much wider impedance bandwidth can be produced, especially at the higher band that provides a wide usable fractional bandwidth of more than 120% (2.98–12.25 GHz). To generate a single frequency band‐stop performance, we add a pair of C‐shaped parasitic structures in the ground plane, and also in order to create the second notch frequency, we insert a horizontal rectangular strip in the center of two C‐shaped parasitic structure in the ground plane. The measured results reveal that the presented dual band‐notch monopole antenna offers a wide bandwidth with two notched bands, covering all the 5.2/5.8 GHz wireless local area network, 3.5/5.5 GHz WiMAX, and 4 GHz C bands. Good and radiation behavior within the UWB frequency range have also been obtained. The antenna has a small dimension of 12 × 18 mm2. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2743–2747, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27209
An absorptive bandpass‐integrated p‐i‐n diode T/R switch for 2.5 GHz WiMAX high power terminals
Authors: Phudpong Ravipat , Youngthanisara Narit , Kukieattikool Pratana , Kitjaroen Matanee , Siwamogsatham Siwaruk 
Published: September 2012

AbstractThis article presents a new technique for a transmit/receive (T/R) switch, which originally consists of p‐i‐n diodes and quarterwave lines. By using a reverse‐biased capacitance of the p‐i‐n diodes and additional inductive components, the conventional T/R switch can be made to incorporate a function of a bandpass filter. The filter response can be theoretically designed by configuring the inductance and capacitance values. In this article, an absorptive bandpass‐integrated p‐i‐n diode T/R switch is presented. It achieves a bandpass response at 2.5 GHz with a bandwidth of 450 MHz and an insertion loss of 2.3 dB. It offers high return loss and high isolation, 20 and 50 dB, respectively, and can tolerate power up to 20 W. This filter‐integrated switch could be used as a T/R switch for high power time division duplex systems such as WiMAX in the 2.3–2.7 GHz frequency band. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2705–2708, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27210