bluuebunny/crossref_metadata_2025_split huggingface dataset:
A 3.4/5.5 GHz dual‐band notched UWB printed monopole antenna with two open‐circuited stubs in the microstrip feedline
Authors: Panda Jyoti Ranjan , Kshetrimayum Rakhesh Singh 
Published: September 2011

AbstractAn ultrawideband (UWB) printed monopole antenna (PMA) for the 3.4/5.5 GHz dual‐band notched operation is presented.The antenna has a rectangular radiating element with a symmetrical staircase structure in the bottom or feed region and fed by a 50‐Ω microstrip line. By introducing two open‐circuited stubs from the two sides of the microstrip feedline, dual band‐notched characteristics in the WiMAX/WLAN bands are achieved. The proposed antenna is effectively designed, simulated, fabricated, and measured providing broadband impedance matching, appropriate gain, and stable radiation pattern characteristics. An UWB and single band‐notched UWB antenna are also fabricated for comparison. The proposed UWB antenna is investigated in time domain, and it has been observed experimentally that the received fifth derivative of Gaussian pulse is not distorted in the main waveform but some amount of ringing is observed. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2973–2978, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26380
Substrate integrated waveguide filter design with wave concept iterative procedure
Authors: Alhzzoury A. Ismail , Raveu N. , Prigent G. , Pigaglio O. , Baudrand H. , Al‐Abdullah K. 
Published: September 2011

AbstractA bandpass filter in substrate integrated waveguide (SIW) technology is designed with its suitable excitation. Sensitivity analysis of the SIW filter electrical response toward the number and positions of metallic via holes are performed using wave concept iterative procedure. It leads to a reduction of the number of vias with identical performance of the filter. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2939–2942, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26381
Enhancement of the rejection bandwidth of microwave‐coupled lines filters using spurline structures
Authors: Loo‐Yau J. R. , Gómez‐Pichardo O. I. , Sandoval‐Ibarra F. , Maya‐Sánchez M. C. , Reynoso‐Hernández J. A. 
Published: September 2011

AbstractA new bandstop‐coupled line filter using spurline structures has been presented in this work. The new bandstop filter enhances the rejection bandwidth of bandstop coupled line filters in a 50%. To demonstrate the idea, classical bandstop‐coupled line filters with and without simple spurlines structure were designed using Rogers material, and their frequency response were compared. Simulations performed with momentum agree with experimental results, demonstrating the usefulness of spurlines structures in the enhancement of the bandwidth of coupled line filters. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2893–2896, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26382
A Q‐band CMOS low‐noise amplifier using a low‐voltage cascode in 0.13‐μm CMOS technology
Authors: Lee Seong‐Gwon , Lee Jong‐Wook 
Published: September 2011

AbstractA Q‐band low‐noise amplifier (LNA) suitable for low‐voltage operation is presented in this paper.The amplifier uses a low‐voltage cascode structure in the first stage of the amplifier and was fabricated using a 0.13‐μm RF CMOS process with eight layers of copper metallization. Low‐voltage operation of the LNA was achieved in the millimeter‐wave band while still maintaining the high‐gain advantage of the cascode structure. Measured results show that the amplifier adopting the low‐voltage cascode structure provides similar gain to the conventional, telescopic cascode structure. The fabricated amplifier presented here achieves a 19.5‐dB small‐signal gain and a 7.5‐dB noise figure at 45 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2985–2988, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26389
Design of broadband transitions for substrate integrated circuits
Authors: Koziel Slawomir , Ogurtsov Stanislav 
Published: September 2011

AbstractWe present a methodology to enhance bandwidth of the conductor backed coplanar waveguide‐to‐substrate integrated waveguide and microstrip‐to‐integrated waveguide transitions.Our approach exploits metalized vias partially protruding into substrate in the transition region as tuning elements. This allows us—for the considered type of transition—to increase useable bandwidth. Geometry parameters, including positions and sizes of extra vias, are adjusted using simulation‐driven optimization procedure that exploits coarsely‐discretized electromagnetic (EM) models of the transitions and the adaptively adjusted design specifications technique. The optimal design is obtained at a low‐computational cost corresponding to a few high‐fidelity EM simulations of the structure of interest (typically comparable with the number of design variables). Our technique is demonstrated with the X‐band designs. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2942–2945, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26391
Closed‐form design method for broadband parallel‐coupled microstrip coupler with tight coupling and practical spacing
Authors: Abbosh Amin M. 
Published: September 2011

AbstractA closed‐form method to design microstrip couplers that have tight coupling, practical dimensions, simple structure, and broadband performance is presented. The method is based on the quasi‐static even‐odd mode approach. According to the proposed method, three‐lumped capacitor connected at the center of the coupled structure are used to relax the requirement on the gap width between the coupled lines. The simulated and measured results of 3 dB couplers designed using the proposed method confirm its validity. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2790–2794, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26395
Electromagnetic analysis of planar array structures with MPIE–MoM method and neighborhood mutual coupling
Authors: Padilla de la Torre P. , Fernández J.M. , Sierra‐Castañer M. 
Published: September 2011

AbstractAn essential aspect when considering radiating array elements for simulation is to add the effect of the surrounding array cells in the analysis of the studied radiating element.The aim of this article is to present a complete mixed potentials integral equation solver including mutual coupling between elements in an array structure. The theoretical approach is presented along with some particular issues, in terms of programming and performance. Some canonical structures are analyzed in order to validate the developed electromagnetic tool and compared with commercial software. This electromagnetic tool has been built up for the analysis of antenna array structures and transmitarray lenses. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2746–2754, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26397
Broadband circularly polarized gap‐coupled arrangement of rectangular patches for modern communication systems
Authors: Sekra Pratibha , Shekhawat S. , Bhatnagar D. , Saxena V.K. , Saini J. S. , Joshi L. M. 
Published: September 2011

AbstractThe radiation performance of broadband circularly polarized gap‐coupled arrangement of rectangular patches is reported in this article. This arrangement of patches is designed on glass epoxy FR‐4 substrate. The considered structure consists of three rectangular patches having separation “d” between them. The central designed patch is excited through a single inset feed point while the other two patches are gap coupled to the central patch. After extensive optimizations, it is realized that the considered structure resonates at two closely spaced frequencies lying in the median band for the WiMax communication systems approved by IEEE 802.16 Working Group and presents nearly 12% impedance bandwidth. Additionally, the radiations are circularly polarized in nature, though the axial ratio bandwidth is narrow. The radiation patterns in the entire bandwidth are identical in nature. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2935–2939, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26398
A low phase noise oscillator with a high‐Q split ring resonator using MNG metamaterial
Authors: Yoon Ki‐Cheol , Lee Jong‐Chul 
Published: September 2011

AbstractIn this article, a novel high QL triple‐split ring resonator (T‐SRR) of mu‐negative metamaterial is suggested.It is used in the design of an I‐ band oscillator. A very low phase noise can be obtained for the oscillator due to the sharp band‐rejection characteristic of T‐SRR. The oscillator is designed to operate at 10 GHz using the novel T‐SRR. Experiments show that the output power is 9.82 dBm, the second harmonic suppression is −26.48 dBc, and the phase noise is −105.05 dBc/Hz at a 100‐kHz offset. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2967–2971, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26404
A 5.8‐GHz frequency synthesizer chip design for worldwide interoperability for microwave access application
Authors: Huang Jhin‐Fang , Shih Chun‐Wei , Liu Ron‐Yi 
Published: September 2011

AbstractA 5.8‐GHz frequency synthesizer using wideband LC‐tank voltage‐controlled oscillator (VCO) for worldwide interoperability for microwave access applications with a 1.8 V voltage supply has been designed and successfully implemented in TSMC 0.18 μm CMOS process. In this proposed circuit, two important ideas are applied. First, a 3‐bit binary weighted capacitor array in the VCO is adopted to extend the tuning range and reduce the phase noise. Second, a class‐AB current mode logic is utilized in first divider stage to handle the high frequency signal. Measured results show that output frequency of VCO is tunable from 5.3 to 6.1 GHz corresponding to 14.1%, and phase noise is −110.2 dBc/Hz at 1 MHz offset, output power spectrum is −9.24 dBm at frequency of 5.73 GHz, power consumption is 32 mW, and including pads, chip area is 0.53 (0.82 × 0.65) mm2. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2931–2935, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26405
Wideband low‐noise amplifier design using the LC‐ladder and capacitive shunt–shunt feedback topology
Authors: Weststrate Marnus , Sinha Saurabh 
Published: September 2011

AbstractThe LC‐ladder and capacitive shunt–shunt feedback topology has been identified as a potential candidate for the implementation of wideband low‐noise amplifiers.This article presents a summary of the mathematical model describing this configuration and explains the improvement of the linearity which also results in reduced sensitivity to process variations. Simulated and preliminary measured results for a design using the IBM 7WL SiGe processes are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2922–2931, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26406
Application of microstrip cavity couplers for wideband bandpass filters
Authors: Cheng Jui‐Ching , Li Eric S. , Chuang Chin‐Chung 
Published: September 2011

AbstractThis article presents a design for wideband bandpass filters using a microstrip cavity coupler. The broadband nature of the cavity‐coupled designs is fully exploited for this application. Two additional circuits are introduced to improve the stopband performance of the cavity‐coupled bandpass filter. A prototype design example is presented with its center frequency located at 6.28 GHz. The design has the merits of wide bandwith of more than 140%, flat group delay within the passband, good insertion/return loss, and stopband attenuation of nearly 30 dB up to 30 GHz. The validity of the simulation results is verified experimentally. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2814–2817, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26410
Design of a compact multiband internal antenna for mobile application
Authors: Li Jianxing , Jiang Yansheng , Zhang Anxue , Chen Juan , Sheng Xiong 
Published: September 2011

AbstractA compact multiband internal antenna for global system for mobile communication, digital cellular system, and wireless local area network services is proposed. The proposed antenna is composed of a multiple input and multiple output (MIMO) antenna and a dual‐band printed inverted F antenna. In particular, projected ground structure is adopted to improve isolation characteristic between the two elements of the MIMO antenna. The experimental results show that sufficient bandwidths, reasonable radiation patterns, and antenna gains are achieved for each frequency band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2865–2868, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26413
Radiation measurement of 60 GHz high resistivity silicon on insulator double slot antenna
Authors: Barakat Moussa H. , Delaveaud Christophe , Ndagijimana Fabien 
Published: September 2011

AbstractThe performance of a 60 GHz folded‐slot antenna integrated on high resistivity silicon on insulator is described.The antenna is composed of a coplanar waveguide transmission line and the radiating slots. The slot antenna is folded and short circuited at its edge to optimize the 50 Ω matching impedance process. Backside substrate metallization has been used to improve radiation properties. A novel test method is used to measure the gain pattern of the dipole. The resulting measured radiation efficiency is 20% with a gain around −5.5 dBi at 60 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2861–2865, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26414
Erratum: Implementation of an efficient shooting and bouncing rays scheme
Authors: Dikmen Fatih , Ergin A. Arif , Sevgili A. Levent , Terzi Bilgin 
Published: September 2011

AbstractOriginally published Microwave Opt Technol Lett 52:2409–2413, 2010. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53: 2003, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26418 (Original article DOI 10.1002/mop.25492)
Circularly polarized annual ring antenna perturbed by asymmetrical defected ground structures for improved gain
Authors: Pyo S. , Lee M.‐J. , Lee H.‐S. , Kim S.‐H. , Kim Y.‐S. 
Published: September 2011

AbstractA novel perturbing methodology using asymmetrical defected ground structure (DGS) is proposed for a circularly polarized (CP) annual ring antenna with improved antenna gain. By loading two fairs of half dumbbell‐shaped DGS at four diagonal corners of the ring radiator, the orthogonally polarized modes are controlled. Simulated and measured results show that the proposed antenna demonstrates good CP radiations at the resonant frequency. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2994–2996, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26420
Low power and high conversion gain 21‐GHz receiver front end in a standard 0.18 μm CMOS technology
Authors: Chen Chi‐Chen , Lin Yo‐Sheng 
Published: September 2011

AbstractThis article describes a monolithic receiver front end comprising a low‐noise amplifier (LNA), a mixer, an intermediate‐frequency (IF) amplifier, and an IF filter implemented in a standard 0.18 μm CMOS technology.Current‐reused technique is used in the LNA to reduce power dissipation. Current bleeding technique is used in the mixer to improve conversion gain and power linearity. To enhance RF–IF and LO–IF isolation, an RC low‐pass filter (i.e., IF filter) is added in the drain terminal of the input transistor of the cascode IF amplifier. At an RF of 21 GHz and IF of 2.4 GHz, the receiver front end dissipated 43.2 mW and exhibited a noise figure (NF) of 8.6 dB, and a conversion gain of 20.3 dB. In addition, excellent isolation was also achieved. The measured LO–IF and LO‐RF isolation is −30.9 dB and −51.1 dB, respectively, at LOin of −1 dBm. The measured RF–IF isolation is −57.3 dB at RFin of −30 dBm. The chip area is only 0.97 × 0.9 mm2, that is, 0.873 mm2, excluding the test pads. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2875–2879, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26423
Compact dual‐mode bandpass filter using meander defected ground waveguide loop resonator
Authors: Liu Haiwen , Xu Wenyuan , Shen Li , Jiang Yang , Shi Liyun , Wan Jing , Lim Jongsik , Ahn Dal 
Published: September 2011

AbstractTo miniature the size of dual‐mode defected ground structure (DGS) resonator, novel meander defected ground waveguide resonator filter geometry is proposed in this letter. Its equivalent circuit structure and the coupling scheme are analyzed by even–odd mode theory. Defected corner‐cut perturbation is introduced to adjust the strength and nature of the coupling between the degenerate modes of this dual‐mode resonator. This filter with elliptic characteristics is designed, fabricated and measured. A good agreement between simulation and measurement verifies the validity of this design methodology. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2802–2805, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26425
A new technique for bandwidth improvement and size reduction of helical antennas
Authors: Alsawaha H. , Safaai‐Jazi A. 
Published: September 2011

AbstractNovel modifications on axial‐mode wire helical antennas are introduced by replacing the wire with a tapered strip and using a doubly tapered impedance matching section.These modifications increase the bandwidth by 8% and reduce the helix height buy more than 0.6 wavelength. Simulation and measurement results are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2990‐2994, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26427
Modified dual monopole antenna for WLAN operation
Authors: Seo Yongseok , Jung Jinwoo , Lee Hyeonjin , Lim Yeongseog 
Published: September 2011

AbstractA novel and simple design of a coplanar waveguide‐fed folded dual monopole antenna with dual‐band frequency operation for a wireless local area network (WLAN) application is proposed. The obtained impedance bandwidths reach about 37.3% for the 2.4 GHz and 15.5% for the 5.8 GHz band, meeting the required bandwidth specifications of the IEEE 802.11a/b/g standards. The peak antenna gains for the operating frequencies across dual WLAN bands are measured to be 6.30 and 5.16 dBi, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2768–2770, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26428
Multiband double‐folded PIFA design for mobile applications
Authors: Sim Chow‐Yen‐Desmond , He Wen‐Bin 
Published: September 2011

AbstractA compact size (15 × 40 mm2) microstrip‐fed printed planar inverted‐F antenna (PIFA) for mobile applications operating in the GSM/DCS/PCS/UMTS/WLAN and WiMAX bands is proposed. The main structure of this antenna is simply a double‐folded PIFA with two wide open‐ended radiating sections. By tuning the dimensions of the shorter open‐ended section, optimum impedance matching can be achieved, while additional slits loaded to the longer open‐end section are for the inclusion of universal mobile telecommunications system band. To allow shifting of the higher frequencies modes so that a wide impedance bandwidth from 5 to 6 GHz can be achieved, the technique of adjusting the position of the shorting post horizontally along the ground plane is also introduced. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2952–2960, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26429
A novel ultra‐wide band bandpass filter with notched band using slotline and microstrip resonators
Authors: Guan Xuehui , Chen Peng , Fu Wei , Liu Haiwen , Li Guohui 
Published: September 2011

AbstractA novel ultra‐wide band bandpass filter with notched band is presented.Multi‐mode resonator is realized using a stepped‐impedance slotline. The resonator is orthogonally coupled to the microstrip feed lines, and ultra‐wide passband is obtained. Microstrip open loop resonators are loaded on the slotline, and notched band from 5.1 to 5.3 GHz is achieved. The filter is designed, fabricated, and measured. Good agreement is achieved between measured and predicted results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2949–2951, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26430
Bipolar dual‐band MPRS‐FSS sectoral antenna for base station applications
Authors: Hajj M. , Toubet M. Salah , Chantalat R. , Monediere T. , Jecko B. 
Published: September 2011

AbstractThis article deals specifically with sectoral antennas and focuses on the ability to design a bipolar dual‐band structure by combining double layers metallic partially reflective surface (MPRS) working on orthogonal polarizations as a superstrate with a frequency selective surfaces (FSS) as a substrate , thus making it possible to circumvent the narrow bandwidth problem. The use of metallic structures offers a new approach to industrial partners to reduce costs and to facilitate design techniques. This antenna provides vertical and horizontal polarizations with a sectoral radiation pattern presenting a half power beamwidth of at least 60° in the azimuth plane. We obtain the different operating frequencies by adjusting the distance of MPRS layers from FSS layer. The proposed structure presents more than 15 dBi directivity enhancement at 4.8 and 5.6 GHz as compared to those of a patch antenna with 8 dB directivity. The geometry and characteristics of the antenna are detailed and a design method is proposed. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2907‐2912, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26431
High‐performance low‐power 27‐GHz CMOS voltage‐controlled oscillator for Ka‐band applications
Authors: Yeh Mei‐Ling , Lin Yao‐Chian , Chang Chung‐Cheng 
Published: September 2011

AbstractA new low‐power 27.07‐GHz voltage controlled oscillator is designed for Ka‐band applications in this article. Body bias technique is used for the low‐power and low‐phase noise VCO design. The VCO can be tuned from 26.35 to 27.102 GHz. The measured phase noise is −106.2 dBc/Hz at 1 MHz offset from the carrier frequency. The corresponding figure‐of‐merit (FOM) is calculated to be −183.2 dBc/Hz. The VCO is implemented with the TSMC 0.18 μm one‐poly‐six‐metal 1.5 V mixed signal/RF CMOS technology. The chip size is 0.565 × 0.69 mm2. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2872‐2875, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26433
Electromagnetic inversion with the multiscaling inexact Newton method—experimental validation
Authors: Randazzo Andrea , Oliveri Giacomo , Massa Andrea , Pastorino Matteo 
Published: September 2011

AbstractThe integration of the inexact Newton method within a multiscaling strategy is assessed in the framework of the contrast‐field formulation of the electromagnetic inverse scattering. By using the features of the integrated approach, the technique is expected to suitably face the nonlinearity and the illposedness/ill‐conditioning issues of the imaging problem. A numerical validation dealing with experimental data related to different objects is carried out to provide evidence of the method premises pointing out features and potentialities as well as current limitations. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2834–2838, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26435