bluuebunny/crossref_metadata_2025_split huggingface dataset:
Microstrip‐line‐fed rectangular microstrip antenna with open end meandering slots in the ground plane for compact broadband operation
Authors: Kiran Usha , Vani R. M. , Yadahalli Ravi M. , Hunagund P. V. , Farida Sara F. 
Published: February 2007

AbstractIn this paper, microstrip‐line‐fed rectangular microstrip antenna with open‐end meandering slots in the ground plane for compact broadband operation is presented. The proposed design consists of a rectangular patch which is fed by a 50‐Ω center fed microstrip‐line feed. Three identical narrow open‐end meandering slots were embedded in the antenna's ground plane parallel to the rectangular patch's radiating edge. Experimental study is carried out by varying the length of the open‐end meandering slots. Using open‐end meandering slots in the ground plane, the resonant frequency of the antenna is greatly lowered with large enhancement in bandwidth when compared with conventional microstrip antenna. With the proposed design, an extreme reduction of 82.9% in the antenna size is obtained with a wide bandwidth of 40%. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 824–827, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22267
Internal meandered loop antenna for GSM/DCS/PCS multiband operation in a mobile phone with the user's hand
Authors: Lin Chun‐I , Wong Kin‐Lu 
Published: February 2007

AbstractA novel internal meandered loop antenna for application in a mobile phone for Global System for Mobile Communication/Digital Communication System/Personal Communication System (GSM/DCS/PCS) multiband operation is presented. Along the symmetric metal‐strip loop structure of the antenna, there are meandered sections for adjusting the antenna's resonant frequencies and widened sections for improving the impedance matching. The antenna's first and second resonant modes (half‐ and one‐wavelength modes) excited at about 900 and 1800 MHz for GSM/DCS operation. With the meandered sections in the loop structure, the antenna's third resonant mode (1.5‐wavelength mode) can be adjusted to be close to the second resonant mode at 1800 MHz to achieve a wider upper band for DCS/PCS operation. In addition, the central region of the proposed loop antenna is unoccupied, which can be used to accommodate possible nearby electronic components, such as the lens of a digital camera. Furthermore, effects of the user's hand holding the mobile phone with the proposed loop antenna are analyzed in this study. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 759–765, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22271
Broadband coplanar waveguide‐fed slot antenna for wireless local area networks and microwave imaging applications
Authors: Ali Mohammod , Tailor Ashit 
Published: February 2007

AbstractA broadband CPW‐fed semicircular slot antenna is proposed for 2–6 GHz WLAN (wireless local area networks) and microwave imaging applications. The total dimension of the bidirectional slot antenna is 80 mm by 50 mm and is designed on a 0.5‐mm‐thick Duroid 5880 substrate (dielectric constant = 2.2). The antenna operates from 2 to 6 GHz within VSWR of 2.5:1. The same antenna on a combination rectangular cylindrical cavity with cavity depth of 10 mm provides a directional beam, 11 dB front‐to‐back (F/B) ratio and a bandwidth of 63% (2.8–5.4 GHz). © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 846–852, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22276
A CMOS wideband linear‐in‐dB VGA for UWB applications
Authors: Lee Hui Dong , Lee Kyung‐Ai , Hong Songcheol 
Published: February 2007

AbstractA CMOS wideband variable gain amplifier (VGA) with an exponential gain control characteristic is presented. The exponential gain control function is realized by changing the tail currents a differential gain stage. The bandwidth is extended by using an inductive peaking technique. The gain (in dB) of the VGA is varied linearly from −41 dB to 31 dB with respect to a control voltage from 1.38 V to 1.1 V. The bandwidth of the proposed VGA is larger than 1 GHz with a gain control range of 72 dB. A DC offset cancellation loop is included so as to avoid amplification of the DC offset. The VGA is powered by 1.8 V with 13.5 mA. The VGA chip occupies an area of 220 μm × 620 μm. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 812–817, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22278
Compact angularly stable AMCs utilizing skewed cross‐shaped FSSS
Authors: Hosseini M. , Pirhadi A. , Hakkak M. 
Published: February 2007

AbstractThis paper presents an innovative methodology for designing three new Artificial Magnetic Conductors (AMC) with very little sensitivity to the angle of incidence and compact size. The AMC structures are composed of a Frequency Selective Surface (FSS) placed at the interface of a metal‐backed dielectric slab. The FSSs used belong to the family of Skewed Crosses (SC). The paper begins by investigating the properties of a GA‐designed AMC presented in a previous literature. After that, a basic SC‐based AMC is extracted from this AMC and is modified step by step to improve the desired features. The modifications are performed not based on time‐consuming optimization methods, but by utilizing the theoretical clues presented in another literature for similar structures. Taking these strategies, such AMCs are obtained that have very good angular stability, compact size, and acceptable bandwidth. Periodic Method of Moments (PMM) is used to analyze and study the proposed periodic structure. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 781–786, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22280
A broadband microstrip Marchand balun with vertical coupling structure
Authors: Nam Hee , Yun Tae‐Soon , Lee Jong‐Chul 
Published: February 2007

AbstractIn this paper, a broadband microstrip Marchand balun is presented. It is implemented by new vertical coupled structure, which is suggested to improve the coupling effect in the conventional coupler. Using this vertical coupling structure, the Marchand balun shows broad bandwidth of larger than 115% at the center frequency of 2.3 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 752–755, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22281
Tunable flat‐top fiber Bragg grating filters fabricated in hydrogen‐loaded graded‐index multimode fibers
Authors: Fu Hong‐Yan , Liu Wei‐Sheng , Shao Li‐Yang 
Published: February 2007

AbstractWe propose an experimental realization of flat‐top filters by fabricating fiber Bragg gratings in graded‐index multimode fibers (GI‐MMF). Two types of GI‐MMFs were used to make this kind of filters, and their spectra and polarization properties were experimentally investigated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 841–843, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22286
Planar monopole antenna with wide impedance bandwidth for mobile handset application
Authors: Kim Wonseob , Hong Seokjin , Park Hoon , Choi Jaehoon 
Published: February 2007

AbstractDesign of a planar monopole antenna with wide impedance bandwidth characteristic for mobile handset application is presented. To enhance the impedance bandwidth characteristic, a beveling technique has been implemented on the radiating patch and two notches are formed along the edge of the ground plane. The proposed antenna has 10 dB return loss impedance bandwidth of about 9.8 GHz (1.66–11.5 GHz). © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 779–781, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22289
Mutual coupling study on meander line antenna elements for use in active‐phased array
Authors: Beenamole K. S. , Kutiyal Prem N. S. , Revankar U. K. , Pandharipande V. M. 
Published: February 2007

AbstractMutual coupling study has been carried out on microstrip Meander line antenna elements for use in active‐phased array radars. The basic Meander line antenna element has been designed to obtain linear horizontal polarization with a wide bandwidth and wide beamwidth in S‐band frequency. The elements are fabricated on a low cost glass epoxy (FR4) substrate with array interelement spacing of approximately half wavelength. The mutual coupling study has been carried out in a linear and planar array environment and the results show no performance degradation of the array element impedance and patterns due to mutual coupling. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 745–749, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22291
A 2.4 GHz ultra low power subthreshold CMOS low‐noise amplifier
Authors: Meng Lim Kok , Yong Ng Choon , Seng Yeo Kiat , Anh Do Manh 
Published: February 2007

AbstractA 2.4 GHz subthreshold CMOS low‐noise amplifier (LNA) employing current‐reuse technique is presented for the first time. The circuit measuring 1050 × 723 μm2is designed using CHRT's 0.18 μm RF CMOS technology. With the push–pull configuration, the amplifier simulated using Spectre® has a gain of 9.8 dB, IIP3 of −2.7 dBm, and NF of 3.6 dB, while consuming a mere 650 μA from a 1 V supply. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 743–744, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22292
Comparison of two wavelength conversion schemes by exploiting cascaded harmonic and difference frequency generation in PPLN
Authors: Luo Chuanhong , Sun Junqiang , Wang Jian 
Published: February 2007

AbstractThe comparison of two wavelength conversion schemes under the continuous‐wave (CW) and pulsed pumping condition based on cascaded harmonic and difference frequency generation is theoretically analyzed and experimentally demonstrated using a periodically poled lithium niobate waveguide. The difference of bit‐transferring road and conversion process between two schemes loads to the difference of the spectrum and waveform of converted pulse. The CW pumping wavelength conversion presents a good performance in copying the spectrum, waveform, bit rate, and phase of the information carried by signal wavelength onto converted wavelength. In pulsed pumping wavelength conversion the spectrum change and waveform distortion of converted pulse occurs due to group velocity mismatch between pump, second harmonic, and converted pulse, so the pulsed pumping wavelength conversion is only a process that converted pulses replicate the bit rate of signal pulses. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 905–910, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22293
All‐optical on–off switch based on bismuth‐based highly nonlinear fiber
Authors: Qureshi K. K. , Wai P. K. A. , Tam H. Y. , Chao L. , Sugimoto N. 
Published: February 2007

AbstractWe propose a simple and compact all‐optical on–off switch working at 10 Gb/s. The operation of the switch is based on four‐wave mixing in only 1.9 m of bismuth‐based highly nonlinear fiber. The proposed switch has a fast response time, high ON/OFF switching ratio, and potential to work beyond 10 Gb/s. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 838–841, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22295
Analytical model for electromagnetic bandgap structures embedded in power/ground plane
Authors: Wu Xin 
Published: February 2007

AbstractThis study presents an analytical model to calculate the stop band of the electromagnetic bandgap (EBG) materials embedded in PCB power/ground plane to mitigate power/ground plane noise. By treating the EBG structure as lumped elements at each unit, the currents flowing through the EBG patches may be analytically computed for the modes in the power/ground plane. An analytical model is derived based on the superposition of the local EBG currents' effects on the modal field distribution in the substrate. Comparisons with measurements are also presented to validate the derived model. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 835–838, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22296
Novel rectangular waveguide resonant cavity constructed in dielectric substrate with arc corners
Authors: Wang Dapeng , Che Wenquan , Yung Edward K. N. 
Published: February 2007

AbstractA novel substrate‐integrated waveguide resonant cavity with four‐arc corners has been investigated, which is constructed into the thin dielectric substrate. The theoretical length equivalence formulas for the resonant cavity have been obtained on the basis of analytical method of moment. It has been found that the resonant frequency can be kept constant when the shape factor of the cavity is small. On the other hand, the resonant frequencies of the cavity can also be tuned a little when the shape factor of the cavity is big. The empirical formula of resonant frequencies for the cavity with arc corners has been obtained. Several resonant cavities with different radius of arc corners have been designed and fabricated to demonstrate the proposed theoretical analysis. Good agreement can be observed between the theoretical analysis and experiments. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 804–808, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22297
The design of a compact quasi‐elliptic filter using stepped impedance resonators with harmonic suppression
Authors: Chen Yu‐Wei , Ho Min‐Hua , Liu Yen‐Ju 
Published: February 2007

AbstractA bandpass filter is designed at 2.4 GHz using two end‐connected quarter‐wavelength stepped impedance resonators. The quarter‐wavelength stepped impedance resonators having one end shorted are formed by a half‐wavelength stepped impedance resonator with its middle shorting to ground. The modes that the shorted‐end λ/4 stepped impedance resonator supports are the (1 + 2n)/4. An enhanced U‐shape coupling feed is adopted in the filter design to reduce the insertion losses as well as to suppress the first higher harmonic. A dual‐path design is implemented in the proposed filter to create a quasi‐elliptic frequency response. The equivalent circuit model is developed and the experiments are conducted for circuit design verification. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 800–804, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22298
An improved approximate gain formula for conical horn
Authors: Tan Chin Yeng , Selvan Krishnasamy T. 
Published: February 2007

AbstractThe conical horn gain is expected to increase with increasing flare angle until it reaches a maximum and then should decrease. The available closed‐form approximation for conical horn loss factor, and hence gain, is examined in this paper in this background. It turns out that this approximation is not consistent with the normal conical horn gain pattern for aperture phase deviation s > ∼ 0.5. A new approximation is presented based on available data that results in “normal” gain pattern, and also improves the accuracy of the predicted gain values. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 971–973, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22300
Compact ultrawideband wide‐slot antenna
Authors: Kong K. C. , Luk K. M. , Lau K. L. 
Published: February 2007

AbstractA printed wide‐slot antenna for portable ultrawideband application is presented in this article. It consists of a staircase‐shape patch and an arc‐shape slot etched on different sides of a thin microwave substrate. By using a microstrip feedline with matching stubs to excite the patch and placing a thin conductor‐backed absorber under the slot, wide impedance bandwidth (SWR < 2) of 132.8% and broadside radiation patterns are obtained. This antenna has a peak gain and an average gain of 4.7 and 3.7 dBi, respectively. Moreover, it has a low profile of 0.18λ, where λ is the free space wavelength referring to the center frequency of the operating bandwidth. The antenna is very suitable for the portable devices of nowadays UWB wireless communication systems. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 968–971, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22304
Design of a 3–5‐GHz ultrawideband BiFET mixer using 0.35‐μm SiGE BiCMOS technology
Authors: Ruifeng Song , Huailin Liao , Ru Huang , Yangyuan Wang 
Published: February 2007

AbstractA fully integrated ultrawideband (UWB) bipolar cascode with metal oxide semiconductor field effect transistor (BiFET) mixer using standard commercial 0.35‐μm silicon germanium bipolar complementary metal oxide semiconductor technology was first proposed and fabricated in this study. This presented BiFET mixer using bipolar junction transistor as the transconductor stage and metal oxide semiconductor field effect transistor as the switch stage to achieve noise power and linearity trade‐off. This 3–5‐GHz UWB mixer achieves a conversion gain of 4.5 ± 0.5 dB at the designed band. The mixer core draws a current of 2.5 mA from a supply voltage of 3 V, while consumes chip area of 0.9 × 0.9 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 965–968, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22305
Wide band low profile linear microstrip antenna array with cosecant square‐shaped beam pattern
Authors: Kedar Ashutosh , Kutiyal Prem N. S. , Garg M. , Revankar U. K. 
Published: February 2007

AbstractA wide band, low profile linear microstrip antenna array with cosecant square‐shaped beam pattern is presented. Array synthesis has been done using Orchard Elliott's and genetic algorithm methods. An air‐dielectric U‐slot rectangular patch element has been chosen as an array element for wide bandwidth. Simulated results have shown a good agreement with the measured results of the antenna array realized over 15% bandwidth in L‐band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 963–965, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22309
Electromagnetic assessment on human safety of RFID system at Hong Kong International Airport
Authors: Fung L. C. , Chan K. H. , Lam W. K. , Leung S. W. , Wong Y. F. , Wu Paul W. K. , Tang C. K. 
Published: February 2007

AbstractRadio Frequency Identification (RFID) technology has been widely used in different business sector. Recently, Hong Kong International Airport has adopted the RFID technology, replacing the traditional infra‐red bar code system with a new 900 MHz RFID baggage handling system. Besides the technological challenges in the design and the installation, safety issue of workers due to the radiated emission from the RFID system is also an important concern. An electromagnetic assessment of the RFID system is carried out in the post‐installation phase, and is presented here. The result shows that the in‐situ E‐field level recorded for the whole system is well below the ICNIRP guideline reference level. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 924–928, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22311
Analysis and design of class E power amplifier with nonlinear parasitic capacitance at any duty ratio
Authors: Zhang Hao , Ma Xikui , Wong Siu Chung , Tse Chi K. 
Published: February 2007

AbstractThe nominal operating condition of Class E power amplifiers with parallel‐connected nonlinear parasitic capacitance and linear capacitance at any duty ratio has been studied in this article. Basic design equations are derived analytically. Using these equations, the component values for ensuring nominal operation at any given duty ratio can be conveniently found. Furthermore, the design equations highlight several important practical constraints, which help develop effective designs for improving the performance of practical Class E amplifiers. Finally, a design example is provided for verification. Both PSPICE simulation and experimental measurements are presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 920–923, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22312
A novel LTCC patch filter with sharp transition bands
Authors: Deng Jianhua , Wang Bing‐Zhong , Gan Tiguo 
Published: February 2007

AbstractA novel compact low temperature co‐fired ceramic (LTCC) patch filter is designed with sharp transition bands. The design is based on modified resonators, which can be used to provide transmission zeros located at arbitrary stopband frequency. Simple design procedure of the filter is also described. Good simulation and experimental results are obtained with insertion loss 1.2 dB and return loss of 15 dB at passband. This filter has a compact size of 2.5 mm × 4 mm. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 989–991, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22313
Compact meander monopole antenna for tri‐band WLAN application
Authors: Zhang Li‐Na , Zhong Shun‐Shi , Liang Xian‐Ling , Li Chun‐Hui 
Published: February 2007

AbstractA novel printed meander monopole antenna for tri‐band wireless local area network (WLAN) applications is presented. The antenna is composed of a meander strip and a straight strip with a gap between the ends of them, both printed on an inexpensive FR4 substrate, and is fed by a 50 Ω microstrip feeder with the notched ground plane. The operation bandwidth of the proposed antenna covers 2.4, 5.2, and 5.8 GHz WLAN bands with light weight and compact radiator size of only 12 × 7 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 986–988, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22314
Novel electromagnetic bandgap‐fed tri‐band coplanar slot antenna
Authors: Ooi B. L. 
Published: February 2007

AbstractA novel tri‐band electromagnetic bandgap (EBG) fed coplanar slot antenna is proposed and adopted for this investigation. With the integration of the EBG as an impedance matching element, a wider impedance bandwidth response is obtained for all the bands. Analytical expression for designing the coplanar EBG unit cells are derived for the first time. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 954–960, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22315
Pearson‐IV type doping distribution‐based analytical modeling of dual‐material double‐gate fully‐depleted silicon‐on‐insulator MOSFET
Authors: Kushwaha Alok , Pandey Manoj K , Gupta A. K 
Published: February 2007

AbstractA new two‐dimensional model for dual material double gate fully depleted SOI MOSFET is presented. An investigation of potential distribution in the silicon film is carried out with Pearson‐IV type doping distribution as it is essential to establish proper profiles to get the optimum performance of the device. The proposed structure is such that the work function of the gate metal (both sides) near the source is higher than the one near the drain. The analytical model so developed shows a step‐function in the potential along the channel, which screens the drain potential variation by the gate near the drain thereby suppressing the short channel effects (SCEs). The results predicted by the model are compared with those obtained by 2‐D device simulator ATLAS to verify the accuracy of the proposed model. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 979–986, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22319