bluuebunny/crossref_metadata_2025_split huggingface dataset:
A dual‐band rejected cross monopole antenna maintaining omnidirection radiation
Authors: Chen Wen‐Shan , Lin Chi‐Huang 
Published: July 2008

AbstractUWB cross semi‐elliptic monopole antenna with a dual‐band rejected characteristic is presented and experimentally studied. The proposed cross bevel‐rectangular monopole antenna is embedded with four small h‐shaped slots; it produces a design of dual‐band rejected characteristics and maintains omnidirection radiation. This technique is suitable for creating multiwideband antenna or ultrawideband (UWB) antenna with dual‐rejected band. And the proposed antenna with good omnidirection characteristic is also maintained. Details of the results for the proposed antenna are presented and discussed in this study. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2491–2493, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23712
T‐shaped compact mobile handset antenna for wideband applications
Authors: Yu Byunggil , Byun Joonho , Lee Byungje 
Published: July 2008

AbstractA novel compact and wideband antenna of the mobile handset, consisting of the T‐shaped radiating elements, a coaxial feed, and a partially added high permittivity material, is proposed for wideband applications including GSM, GPS, DCS, PCS, UMTS, and WiBro bands. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2727–2730, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23713
Higher‐efficiency‐biasing technique for enhancing the performance of BJT‐distributed amplifiers
Authors: Leung Tik Shun , Chan Wing Shing 
Published: July 2008

AbstractEfficiency of distributed amplifier based on bipolar junction transistors is low particularly at higher frequencies. The work presented here shows an increase in efficiency of up to three times by applying a proposed unequal biasing technique, which also eliminates the inefficient use of a dummy load at the output artificial transmission line. The proposed circuit provides a maximum power added efficiency of 27.8% which is a three‐times improvement compared with the optimized conventional distributed amplifier. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2725–2727, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23714
Design concept of a mobile handset antenna to mitigate user's hand effect
Authors: Kim Sung‐Joo , Kong Ki‐Hyun , Park Myun‐Joo , Chung Young‐Seek , Lee Byungje 
Published: July 2008

AbstractA meandered loop antenna with the modified ground plane in conjunction with the balanced structure is proposed to mitigate the degradation of antenna performance when the handset is directly held by the user's hand. The antenna efficiency for a dual frequency band (AMPS and PCS) is studied under the influence of the user's hand. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2696–2698, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23715
Design of dual‐band bandpass filter using diverse quarter‐wavelength resonators for GPS/WLAN applications
Authors: Wu Hung‐Wei , Su Yan‐Kuin , Weng Min‐Hang , Yang Ru‐Yuan 
Published: July 2008

AbstractThe novel compact dual‐band bandpass filter (BPF) by using diverse quarter‐wavelength (λ/4) resonators for global position system (GPS)/wireless local area network (WLAN) applications is proposed for the first time. The use of two interdigital‐like λ/4 resonators of the proposed BPF effectively provides the responses for GPS/WLAN at 1.575/5.7 GHz by properly arranging the λ/4 SIRs. Full‐wave simulator IE3D is used to design the proposed BPF. Good agreement with responses of electromagnetic (EM) simulation and measurement is compared. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2694–2696, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23716
Compact planar monopole UWB antenna with band‐notched characteristic
Authors: Zhao Yu‐Long , Jiao Yong‐Chang , Zhao Gang , Zhang Li , Song Yue , Wong Zi‐Bin 
Published: July 2008

AbstractA novel compact ultra‐wideband antenna with band‐notched function is proposed and implemented. The radiating patch consists of a binomial function edge and is fed by coplanar waveguide. The size of the UWB antenna is minimized to 30 × 27.4 mm2. A new type of π‐shaped slot is embedded to obtain the band‐notched characteristic in the 5 GHz WLAN band. The center frequency of the notched band can be varied from 5.2 to 5.8 GHz by properly selecting the parameter values. The measured results are in good agreement with the simulated ones. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2656–2658, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23717
Bandwidth enhancement of printed dipole antenna with tuning stub
Authors: Liu Ying , Gong Shuxi , Bu Antao 
Published: July 2008

AbstractA novel design of tuning stub is presented to improve the performance of printed dipole antenna. In large antenna array, the feed network occupies large ground area, which will deteriorate the performance of antenna array and limit the design of large antenna array. The tuning stub is proposed to reduce the effect of the ground size on antenna array. The stub is approximately one‐fourth wavelength, and its size and position are optimized to control the coupling between the dipole and ground. Under the same measurement condition, the antenna with stub has bandwidth almost two times that of the reference antenna without stub. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2653–2656, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23718
Fourier‐transform phase comparator for the measurement of extrinsic Fabry–Perot interferometric sensors
Authors: Jiang Yi 
Published: July 2008

AbstractA Fourier‐transform phase comparator is developed to measure fiber optic extrinsic Fabry‐Perot interferometric sensors. The phase comparator is realized by comparing the phases of two white‐light spectra, which are obtained by scanning the wavelength of the light source. The changes of a cavity length, which are concerned in most applications, can be interrogated. A linear output is obtained, and a measurement resolution of 15 pm is experimentally achieved, which is very close to the theoretical value. The technique has high resolution and a large dynamic measurement range. In addition, the measurement is not affected by various imperfections of the sensor, light source spectrum profile, and the loss of leading fiber and connectors. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2621–2625, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23719
A compact dual‐band bandpass filter using meandering stepped impedance resonators
Authors: Chen Fu‐Chang , Chu Qing‐Xin 
Published: July 2008

AbstractWe propose a compact dual band bandpass filter (BPF) using meandering stepped impedance resonators (SIRs). By appropriately selecting the impedance ratio (K) of the SIR, the harmonic frequencies can be tuned for generating the dual‐passband response. Using this structure, the bandwidth of each passband can be controlled independently by adjusting the coupling gap and the spur‐line length. The BPF has good dual‐passband performance at 2.4/5.25 GHz and has a very smaller area in comparison with the previous works. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2619–2621, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23720
Error analysis on single sideband modulator
Authors: Chen Lei , Shi Xiaowei , Guo Yuchun 
Published: July 2008

AbstractThis paper analyzes the influence of amplitude and phase error of different path on single sideband modulator (SSB) which can be used as an upconverter. Unwanted sideband suppression expression and error variables equation for maximum output sideband suppression are also deduced. The simulation curve shows the variation of sideband suppression with the amplitude and phase error of the components of SSB is given. Simulation results show that components of the amplitude and phase of the highly consistent or inconsistent amplitude and phase which meet the relationship can achieve higher sideband suppression for the SSB. The completed modulator used as an upper sideband upconverter shows −11 dB typical conversion gain with 22‐dB sideband suppression. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2590–2594, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23721
Wideband bandpass filter for MB‐OFDM application
Authors: Lee Ching‐Her , Hsu Chung‐I G. , Chen Lian‐Yu 
Published: July 2008

AbstractThis article presents a wideband bandpass filter (BPF) designed using novel multimode resonators (MMRs). The MMR is formed by combining two quarter‐wavelength (λ/4) stepped‐impedance resonators (SIRs) in a structure‐shared fashion. The fundamental resonant frequency of the inherent λ/4 SIR and that of the embedded half‐wavelength (λ/2) SIR were designed to locate in the passband of the BPF to achieve a wideband response. Experiments on a prototype wideband BPF were carried out for validating the filter design. The fabricated BPF was measured to have a large bandwidth of 1:2.2 with an insertion loss of less than 0.86 dB and a small group‐delay variation of not more than 0.11 ns in the passband. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2587–2590, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23722
Low‐loss MEMS switchable microstrip filters
Authors: Ong Cen Y. , Okoniewski Michal 
Published: July 2008

AbstractParallel‐coupled microstrip filters with MEMS switchable frequency responses are designed. The 15‐GHz filter switches 5.3% with minimum insertion loss of 0.7 dB, whereas the 20‐GHz filter has 12.9% switching range and minimum insertion loss of 0.6 dB. Both filters have the lowest insertion losses among MEMS tunable microwave bandpass filters to date. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2557–2561, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23723
CMOS top‐series coupling quadrature injection‐locked frequency divider
Authors: Jang Sheng‐Lyang , Wu Sheng‐Chien , Lee Chien‐Feng , Juang M.‐H. 
Published: July 2008

AbstractThis article presents a new divide‐by‐2 injection‐locked frequency divider (ILFD). The ILFD consists of a 2.1‐GHz top‐series quadrature voltage‐controlled oscillator (QVCO) and two NMOS switches, which are in parallel with the QVCO resonators for signal injection. The proposed CMOS ILFD uses three‐dimensional inductor to save chip area and has been implemented with the TSMC 0.18‐μm CMOS technology and the core power consumption is 9.36 mW at the supply voltage of 0.9 V. The free‐running frequency of the ILFD is tunable from 2.02 to 2.28 GHz. At the input power of −8 dBm, the total divide‐by‐2 locking range is from 3.6 to 6.05 GHz as the tuning voltage is varied from 0 to 0.9 V. The phase noise of the locked output spectrum is lower than that of free running ILFD in the ÷2 mode. The phase deviation of quadrature output is about 0.19°. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2554–2557, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23724
Determination of wave propagation properties for multilayered dielectric waveguide by semivectorial beam propagation method with Douglas scheme
Authors: Chen Chun‐Ping , Ma Zhewang , Anada Tetsuo , Hsu Jui‐Pang 
Published: July 2008

AbstractAn improved parabolic‐equation‐based numerical method with Douglas scheme is developed for modeling the new 3D multilayered dielectric transmission waveguides. Unlike the traditional one, such waveguides are constructed by putting the multilayered dielectric cladding with step indices property on a silicon substrate. The propagation properties of widely used polarization‐maintaining waveguides and antiresonant reflecting dielectric waveguide are investigated by this method as examples. The discussion on the numerical dispersion and radiation loss property is also included to validate this improved beam propagation method (or BPM). © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2521–2524, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23725
Numerical specific absorption rate analysis and measurement of a small indoor base station antenna
Authors: Ilvonen Sami , Toivonen Tommi , Toivo Tim , Uusitupa Tero , Laakso Ilkka 
Published: July 2008

AbstractA comparison of different compliance rules for a small indoor base station antenna is presented at frequencies 1800, 2140, and 2450 MHz using a computational model. The numerical model of the antenna is validated using measurements of free space electric field values in close proximity of the antenna and specific absorption rate in a flat liquid phantom. Losses of the antenna are approximated using the measured radiation efficiency as a scaling factor between the input and output power of the antenna. The compliance distances are then computed using the reference levels for field values and equivalent power density. Obtained values are compared to the basic restriction limit in the upper torso of an anatomically realistic numerical model of a human body. The results show that in this case the reference level of maximum value of equivalent power density gives conservative compliance distances. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2516–2521, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23726
Compact multiband PIFA with a coupling feed for internal mobile phone antenna
Authors: Wong Kin‐Lu , Huang Chih‐Hong 
Published: July 2008

AbstractA compact multiband PIFA (planar inverted‐F antenna) occupying a very small volume of less than 0.8 cm3 in the mobile phone for GSM/DCS/PCS/UMTS operation is presented. The PIFA uses a single resonant path only, which is close to about one‐eighth wavelength at 900 MHz. A coupling feed, different from the conventional direct feed, is proposed to excite the PIFA. In this case, the large input impedance at 900 and 1900 MHz can be greatly decreased, making it promising to excite two operating bands at about 900 and 1900 MHz to cover the desired multiband operation. Good radiation characteristics for frequencies over the operating bands are also obtained. The occupied volume of the proposed multiband PIFA is about the smallest among the reported internal multiband mobile phone antennas. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2487–2491, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23727
Printed dual band monopole antenna structures for WLAN applications
Authors: Gupta R. K. , Kumar G. 
Published: July 2008

AbstractThis article proposes printed dual‐band monopole antenna structures for Wireless Local Area Network (WLAN) applications in IEEE 802.11 a/b/g. The proposed antennas are fabricated on a low cost easily available FR4 substrate, which effectively covers both 2.4 and 5 GHz bands. The antenna structures are derived from an E‐shape dual‐band monopole antenna, which generates two separate resonant frequencies for the desired dual‐band operations. The one arm resonates at the 5 GHz band, whereas the other resonates at the 2.4 GHz band. The proposed antennas can easily be fed by using a 50‐Ω probe feed. The measured VSWR is <2 over the 2.4–2.5 GHz and 5.15–5.875 GHz. The radiation patterns indicate the suitability of these antennas for WLAN applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2483–2487, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23728
Design of a fishbone‐shaped antenna with a V‐slot for dual‐band operation
Authors: Kang Suk‐Youb , Min Kyeong‐Sik , Yoon Cheol , Park Hyo‐Dal 
Published: July 2008

AbstractThe structure of the proposed fishbone‐shaped antenna with a V‐slot for dual‐band operation makes it possible to easily design a high‐performance dual‐band antenna by adjusting the location and number of fishbones on both sides of a basic antenna with a V‐slot at the center. This design can be applied to various types of microstrip patch antennas with a centrally located V‐slot. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2509–2512, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23729
CMOS top‐series coupling quadrature injection‐locked frequency divider
Authors: Jang Sheng‐Lyang , Wu Sheng‐Chien , Lee Chien‐Feng , Juang M.‐H. 
Published: July 2008

AbstractThis article presents a new divide‐by‐2 injection‐locked frequency divider (ILFD). The ILFD consists of a 2.1‐GHz top‐series quadrature voltage‐controlled oscillator (QVCO) and two NMOS switches, which are in parallel with the QVCO resonators for signal injection. The proposed CMOS ILFD uses three‐dimensional inductor to save chip area and has been implemented with the TSMC 0.18‐μm CMOS technology, and the core power consumption is 9.36 mW at the supply voltage of 0.9 V. The free‐running frequency of the ILFD is tunable from 2.02 to 2.28 GHz. At the input power of −8 dBm, the total divide‐by‐2 locking range is from 3.6 to 6.05 GHz as the tuning voltage is varied from 0 to 0.9 V. The phase noise of the locked output spectrum is lower than that of free‐running ILFD in the \div\2 mode. The phase deviation of quadrature output is about 0.19°. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2702–2705, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23730
Design of a compact antenna for Bluetooth application
Authors: Yoon Joong Han 
Published: July 2008

AbstractIn this article, a compact antenna with stack geometry for Bluetooth application was proposed and experimentally studied. The antenna consists of a lower patch at the bottom layer, an upper patch at the top layer, and a via that connects the two layers. The effect of various parameters on the top and bottom patch antennas for Bluetooth application is investigated. From the results of the experiments, the measured impedance bandwidth, defied by VSWR 1:3, can reach an operating bandwidth of 170 MHz (2.37–2.54 GHz). Also, antenna radiation patterns and gains within the operating band were measured and studied. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2568–2572, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23731
Comment/correction: “Waves in 2D anisotropic L‐C lattice metamaterials: Phenomenology and properties”
Authors: Glass B. 
Published: July 2008

AbstractIn Brennan et al. (Microwave Opt Technol Lett 48 (2006), 2538–2542), in part 2, (for Y0 = 0) the unusual properties of an infinite bidimensional L‐C lattice obtaining results concerning the propagation of waves (backward and forward propagation) were discussed. The same result was obtained in Brennan et al. (Microwave Symp Dig 2005 IEEE MTT‐S Int 12–17 (2005), 1757–1760) (part II). This comment points out a more efficient performance analysis and shows that the behavior for backward (LHM) or forward (RHM) waves has no special restriction for values of the phase like φi < π/2(i = 1,2). Moreover, it must be carefully treated that the symmetry of the phase diagram (isofrequency) for the first zone of Brillouin (φi = [−π,π], with lattice periodicity 2π). Also, there is an unusual feature for the angle δ(φ1)X=const between the group and phase velocities for backward waves, where there is a discontinuity for isofrequency X = 1 at φ1 = π. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2730–2732, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23732
Miniaturized microstrip filters and diplexers for wireless communication systems
Authors: Zayniyev Damir , Budimir Djuradj , Zouganelis George 
Published: July 2008

AbstractA highly miniaturized microstrip diplexer composed of pseudointerdigital quasi‐elliptical bandpass filters is proposed. Compactness of diplexer is achieved through the combination of the bandpass filters, which does not require matching network. The proposed microstrip diplexer, having a size of 30.7 × 5.6 mm at a center frequency of 2.7 GHz at channel 1 and 3.8 GHz at channel 2 is designed, fabricated, and tested. Experimental results of the fabricated microstrip diplexer are in very good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2701–2702, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23733
CPW‐FED omnidirectional hybrid microstrip/dielectric resonator antenna
Authors: Perron Alexandre , Denidni Tayeb A. , Sebak Abdel R. 
Published: July 2008

AbstractIn this letter, we present a new antenna configuration in which a coplanar waveguide (CPW) is used to feed a cylindrical dielectric resonator (DR) and a subjacent circular patch to generate an omnidirectional radiation pattern. A first prototype, designed to resonate near 2.45 GHz, shows that an impedance bandwidth of 6.3% is achievable using a single layer of substrate. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2699–2701, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23734
Compact broadband monolithic 3‐dB coupler by using artificial transmission lines
Authors: Monti Giuseppina , Tarricone Luciano 
Published: July 2008

AbstractThis letter presents a broadband rat‐race coupler designed by using right‐handed artificial transmission lines (ATLs) combined with a composite right/left‐handed ATL; in order to limit spurious parasitic effects, by using metal–air–metal capacitor and short circuited stubs, both kinds of ATLs have been designed without lumped elements, leading to a very compact and monolithic device. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2662–2667, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23735
An augmented electric field integral equation for high‐speed interconnect analysis
Authors: Qian Zhi Guo , Chew Weng Cho 
Published: July 2008

AbstractThe conventional electric field integral equation (EFIE) is augmented by including charge as the extra unknown, so that the contributions of the vector potential and the scalar potential are separated to avoid the imbalance at low frequencies. With the frequency scaling and the direct enforcement of the current continuity constraint, the new augmented EFIE is free of low‐frequency breakdown for interconnect analysis. Mathematically, it can be categorized as a generalized saddle‐point problem. The new equation is verified by numerical examples. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2658–2662, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23736
The influence of the ASE noise on the cascadability of active Mach‐Zehnder interferometer switches
Authors: Martinez Jose Manuel , Herrera Javier , Ramos Francisco , Marti Javier 
Published: July 2008

AbstractThe influence of the ASE noise on the cascadability of SOA‐MZI structures is investigated. The experimental results show that saturation effects in the SOAs are the main cause of signal degradation, so counter‐propagation pump schemes as well as lower bias currents and optical powers are desirable when cascading several SOA‐MZI optical switches. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2629–2631, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23737