bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultra‐wideband bandpass filter using hybrid microstrip‐defected‐ground structure
Authors: Tang I‐Tseng , Lin Ding‐Bing , Li Chi‐Min , Chiu Min‐Yuan 
Published: September 2008

AbstractA novel ultra‐wideband (UWB) bandpass filter (BPF) with a fractional bandwidth (FBW) of about 110% is presented using the hybrid microstrip‐defected‐ground structure (DGS). The proposed filter was designed using a combination of hybrid microstrip‐defected‐ground structure lowpass filter (LPF) with typical quarter‐wavelength short‐circuited stubs highpass filter (HPF), followed by an optimization for tuning in‐band performance. The high selectivity LPF using hybrid microstrip and four backside slots on ground plane is equivalent to a typical 9‐ploe stepped‐impedance LPF. The proposed LPF is employed to attenuate the upper stopband and etching on the ground plane with four rectangular slots provides attenuation pole to suppress the second spurious harmonic. Four shunt quarter‐wavelength short‐circuited stubs are used to realize the lower stopband for an optimum distributed HPF. The design was successfully realized in theory and verified by full‐wave EM simulation of the full layout and the experiment. The proposed filter had a good performance, including an ultra‐wideband bandpass (3.1–10.6 GHz), low insertion loss, sharp rejection, and a group delay of about 0.12 ns over the most center band. The filter also demonstrated an UWB reject band from 11.4 GHz to more than 19 GHz at −30 dB. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3085–3089, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23875
Multiwavelength erbium‐doped fiber ring laser based on a fiber Sagnac loop filter
Authors: Liu Y. , Liu D. , Wang H. 
Published: September 2008

AbstractWe propose and experimentally demonstrate a multiwavelength erbium‐doped fiber ring laser using a fiber Sagnac loop filter. The fiber Sagnac loop filter served as the wavelength selection component within the ring laser cavity. By carefully tuning the setting of the polarization controller (PC) to effectively change the state of polarization of the light, three, four, and five lasing wavelengths were obtained from the output port of the ring laser. The proposed multiwavelength ring laser has the unique advantages of simple structure, changeable wavelength spacing, tunable number of lasing lines, and low cost. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3053–3054, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23876
Impact of interconnect effects on broadband transimpedance amplifiers
Authors: Shi Xiaomeng , Lu Zhenghao , Seng Yeo Kiat , Ma Jian‐Guo , Do Manh Anh , Li Erping 
Published: September 2008

AbstractA novel interconnect model is used in the postlayout simulation of a broadband transimpedance amplifier. Simulation results employing the proposed model are verified by on‐wafer measurement results. The impact of interconnect effects on the circuit performance is analyzed. The importance of incorporating an adequate interconnect model is demonstrated. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3017–3020, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23878
High gain cavity‐backed slot antenna with a windowed metallic superstrate
Authors: Hanqing M. A. , Chu Qing‐Xin , Qiuyi Zhang 
Published: September 2008

AbstractA novel technique for gain enhancement of cavity‐backed slot antenna is developed and discussed. The high gain radiation of the proposed antenna is achieved by a windowed metallic superstrate above the slot. The parametric studies of the proposed structure are provided, the radiation mechanism of the proposed antenna is investigated, and then the design guidelines for this type of radiators are described. The prototype is fabricated and found to have an impedance bandwidth of 12% and a gain of 12.3 dBi at the center frequency of 2.4 GHz. The characteristics of the proposed antenna have been validated by CST simulation software and experiments. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3114–3118, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23880
Coplanar UWB antenna with increased suppression characteristics
Authors: Lu Yingying , Lam Hung‐Jui , Bornemann Jens 
Published: September 2008

AbstractThe improved band‐notch capability of an ultra‐wideband antenna in coplanar technology is demonstrated. The printed‐circuit element includes not only a slot to attenuate narrowband services but also a coplanar‐waveguide filter in the feeding line to aid attenuation level and bandwidth in the same frequency range. The input match of the antenna increases from around 10 dB (VSWR = 2) in the UWB range to −1.29 dB (VSWR = 13.5) in the suppression band. The radiation patterns of the antenna remain largely uninfluenced by the bandstop measures added to the antenna. The performance is validated by comparison with different commercial full‐wave field solvers. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3111–3114, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23881
Application of negative group delay active circuits to the design of broadband and constant phase shifters
Authors: Ravelo B. , Le Roy M. , Pérennec A. 
Published: September 2008

AbstractThe new phase‐shifter configuration described in this report uses a negative group delay (NGD) active circuit. In this topology, a classical transmission line is set in cascade with an NGD circuit whose phase slopes are alike, but opposite, to get a constant and broadband phase shift. The proposed approach was validated through the design and measurement of a phase shifter, which exhibited a constant phase of 90° ± 5° over a 75% relative bandwidth around 1.6 GHz. Moreover, as the group delay of the NGD circuit compensated the transmission line one, the overall circuit group delay was kept to a small value in the operating frequency band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3078–3080, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23883
Attosecond pulse generation using the multistage nonlinear microring resonators
Authors: Yupapin P. P. , Pornsuwancharoen N. , Chaiyasoonthorn S. 
Published: September 2008

AbstractWe propose a new system of an attosecond pulse generation by using the integrated nonlinear microring devices. A soliton light pulse with wavelength of 1550 nm is entered into the multistage microring resonators, where the ring radii of the recent integrated device product are within the range from 5 to 10 microns. Results obtained have shown that the ultrashort pulse width in the attoscale regime and beyond can be easily generated. When the input peak power of 12 W is applied into the system, the generated pulse with pulse width of 50 is achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3108–3111, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23888
Ultra‐wideband folded loop antenna fed by coplanar waveguide
Authors: Lui W. J. 
Published: September 2008

AbstractIn this article, a novel and successful design of ultra‐wideband folded loop antenna is proposed and investigated. The antenna is fed by coplanar waveguide directly and can be fabricated easily by employing printed circuit board technology. It is studied both numerically and experimentally. From calculated and measured results, it may be observed that impedance bandwidth of over 130% for return loss lower than −9.54 dB and good omnidirectional radiation performance is obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3075–3077, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23890
A triple broadband microwave filter synthesis using nonuniform lines
Authors: Huang Jhin‐Fang , Wen Jiun‐Yu , Lyu Zong‐Min 
Published: September 2008

AbstractIn this article, we propose a mapping method in which the system function of the filter in the z‐domain is found by discrete‐time domain techniques as well as by chain‐scattering matrices of various transmission‐lines to achieve a triple broadband microwave filter based on equal‐length nonuniform coupled lines. The main methodology for designing a triple band filter is using a wideband band‐pass filter to cascade two symmetrical band‐stop filters together to reach the desired bandwidth and low insertion loss. The band‐stop filter and band‐pass filter are five‐order Butterworth ones implanted and placed with a coupled‐serial‐shunted lines structure. The design process is finished by using optimization algorithms to tune the values of the characteristic impedances of each transmission line section. Experimental results agree significantly with the theoretical values. Measurement shows that the 3 dB pass bandwidths are about 650 MHz (1.35–1.8 GHz), 1.15 GHz (3.45–4.6 GHz), and 600 MHz (5.5–6.1 GHz) for Duroid substrates. The insertion loss is about 1.03, 1.15, and 2.05 dB at frequencies of 1.8, 3.45, and 5.85 GHz, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3039–3045, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23893
Ratiometric wavelength monitor based on singlemode‐multimode‐singlemode fiber structure
Authors: Hatta Agus Muhamad , Farrell Gerald , Wang Qian , Rajan Ginu , Wang Pengfei , Semenova Yuliya 
Published: September 2008

AbstractAn all‐fiber ratiometric wavelength monitor for optical wavelength measurement is proposed and investigated theoretically as well as experimentally. Two edge filters with opposite slope spectral responses based on the singlemode‐multimode‐singlemode (SMS) fiber structures are developed. A ratiometric wavelength measurement system employing the developed SMS edge filters demonstrates a high discrimination range of 20.41 dB and a potential wavelength measurement resolution of 10 pm over a wavelength range from 1530 to 1560 nm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3036–3039, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23894
Miniaturized dual‐mode patch filter using slotted square resonator and meander spurline
Authors: Li Xiaohua , Liu Haiwen 
Published: September 2008

AbstractA compact dual‐mode patch filter was designed and examined. Five pairs of slots and a pair of meander spurlines were applied to redirect the current flow on patch resonator, thus the resonance frequencies of the filter are reduced. Moreover, a computer‐aid design (CAD) method using radius base function neural network (RBFNN) is proposed to optimize this new filter. Measurements are given to verify this design and methodology. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3059–3062, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23897
A resonant cavity antenna based on an optimized thin superstrate
Authors: Ge Yuehe , Esselle Karu P. 
Published: September 2008

AbstractA high‐gain, low‐profile electromagnetic band‐gap (EBG) resonator antenna based on a thin frequency‐selective‐surface (FSS) superstrate is presented. The superstrate thickness has been reduced from 0.25λg in the previous design to about 0.06λg without significantly affecting the antenna performance. The FSS superstrate is made out of standard low‐cost FR4 material. The high‐gain performance is achieved by optimizing the metallic patterns printed on the two surfaces of the superstrate so that a high‐Q resonant cavity is obtained. A prototype demonstrates that an EBG resonator antenna made out of a 0.8 mm thick optimized superstrate can provide a gain as high as over 21 dB at the operating frequency of 12 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3057–3059, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23898
Erratum: An integrated 8‐MW 2.4‐GHZ CMOS RF receiver for low‐power WPAN
Authors: Kwon Ickjin , Lee Minkyung 
Published: September 2008

AbstractOriginally published Microwave Opt Technol Lett 50: 2345–2348, 2008. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3280, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23901
Temperature sensor using Hi‐Bi erbium‐doped fiber loop mirror
Authors: Frazão Orlando , Egypto Diogo , Bittencourt Lucas Aragão , Giraldi Maria T. M. R. , Marques M. B. 
Published: September 2008

AbstractIn this letter, a temperature sensor using a fiber loop mirror containing a piece of highly birefringent erbium doped fiber is presented. A Hi‐Bi PANDA erbium‐doped silica fiber was used and compared with the conventional Hi‐Bi PANDA fiber. Different results for strain and temperature sensitivity were obtained. The temperature coefficient sensitivity was −2.22 nm/°C and significantly higher when compared with others conventional Hi‐Bi fibers. Strain experiments were also performed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3152–3154, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23907
CPW‐fed compact meander and L‐shape monopole antenna for dual‐band WLAN applications
Authors: Ham Chung‐Kyun , Baik Jung‐Woo , Kim Young‐Sik 
Published: September 2008

AbstractA compact coplanar waveguide (CPW)‐fed monopole antenna is proposed for dual‐band wireless local area network (WLAN) applications. The proposed antenna, which consists of a meander strip and a L‐shaped strip, has compact size of 20 mm × 17 mm × 1.6 mm including the ground. The impedance bandwidth with 10 dB return loss is about 330 MHz (2.3–2.63 GHz) for 2.4 GHz band and 950 MHz (4.93–5.88 GHz) for 5 GHz band. The measured peak gains are 1.7 dBi at lower and 2.8 dBi at higher band, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3147–3149, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23914
Second harmonic power combining technique for low phase noise cross‐coupled push push VCO
Authors: Chiou Hwann‐Kaeo , Zou Yu‐Lin 
Published: September 2008

AbstractAn even‐mode power combining technique was developed for a high‐performance K‐band push–push voltage control oscillator (VCO) in standard 0.18 μm CMOS technology. The VCO was designed based on linear time variant (LTV) phase noise model. The obtained frequency tuning range and maximum output power were 1.95 GHz and −9.68 dBm with core power consumption of 3.6 mW at maximum oscillation frequency of 26.7 GHz. The push–push VCO demonstrated a phase noise of −117.5 dBc/Hz at 1 MHz offset, which resulted in an excellent FoM of −199.82 dBc/Hz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3242–3246, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23917
On the design of four layered circular microstrip patch antenna
Authors: Kumar Raj , Malathi P. , Thakare Yogesh B. 
Published: September 2008

AbstractThis article presents a simple design expression to calculate resonant frequency (fr) of a four‐layered circular microstrip patch. The resonant frequencies calculated by present method are in good agreement with the calculated value by FDTD method. The average % deviation for circular microstrip patch (CMP) with and without cover is 0.4 and 0.56%, respectively. The average % deviation against FDTD method for composite and suspended CMP is 0.5 and 0.61%, respectively. The change in fr for composite/suspended CMP decreases as the height of the cover increases. The average and maximum % deviation for intentional or unintentional spaced dielectric is 0.43 and 0.85%, respectively upto ratio of h4/h3 = 14. The intentional or unintentional air‐gap brings down the fr of CMP. As air‐gap increases, the fr tends towards the fr of CMP. Spaced dielectric effect on fr is more for small air‐gap. The effect of loaded ice or superstrate on covered CMP further lowers down the resonant frequency. Its effect is more on fr for small h4/h3 ratio. The incremental % change due to loaded superstrate on covered CMP is less than 0.4% and average % deviation against FDTD method is 0.89%. This expression is suitable for computer aided design. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3206–3212, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23920
Compact odd‐order band‐pass filters using capacitively coupled spiral resonators
Authors: Behdad Nader 
Published: September 2008

AbstractIn this article, a new topology for designing compact, band‐pass filters of odd‐order (N = 3, 5, 7, …) is presented. The technique is based on using resonators with parallel RLC type resonance with high loaded quality factor (QL) in conjunction with the capacitively loaded, slow‐wave transmission lines. Using the approach presented in this article compact band‐pass filters with bandwidths as small as 5% to as wide as 50% can easily be designed. The principles of operation of the proposed filter along with experimental results of several different fabricated prototypes are presented and discussed in this article. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3172–3175, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23921
Transformer‐coupled injection for a V‐band divide‐by‐three injection‐locked frequency divider
Authors: Chiou Hwann‐Kaeo , Chen Hsien‐Jui 
Published: September 2008

AbstractA simple transformer‐coupled injection technique is proposed for a V‐band divide‐by‐three injection‐locked frequency divider (ILFD) in 0.18 μm CMOS technology. This technique provides an effective current injection and results in wide locking range of ILFD. The measured frequency range of the ILFD is from 56.5 to 66.4 GHz while varying the tuning voltage Vtune is from 0 to 1.8 V under an injection power of 5 dBm. The DC power dissipation of the core circuit only consumes a current of 3 mA with a single 1 V power supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3169–3172, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23922
Dual‐band branch‐line coupler with two center‐tapped stubs
Authors: Kim TaeGyu , Lee Byungje , Park Myun‐Joo 
Published: September 2008

AbstractA new dual‐band operation scheme is proposed for the branch‐line coupler using two center‐tapped branches. The proposed coupler has two branches with a stub line attached at the center. Only two stubs are required for the dual‐band operation, which reduces the circuit complexity and minimizes the structural change from the conventional branch‐line coupler. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3136–3139, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23924
A compact wideband parallel‐strip 180° hybrid coupler
Authors: Chiu L. , Xue Q. , Chan C. H. 
Published: September 2008

AbstractIn this study, a wideband compact parallel‐strip 180° hybrid coupler with the center frequency of 2 GHz is presented. By replacing the 270° section in the 180° hybrid coupler with a parallel‐strip phase reversal swap, the total circuit size is reduced by half. In this structure, the phase gradients of the four arms of the coupler are equalized; therefore, the operation bandwidth is dramatically enhanced. S‐parameters of the coupler are simulated and measured with good agreement. As predicted from the measured data, the bandwidth of the 90% combining efficiency is increased from 45 to 124%. The proposed design achieves more than −25 dB signal suppression within the whole measured frequency range (0–4 GHz) as opposed to 1.8 to 2.2 GHz of the conventional design. The proposed 180° hybrid coupler can serve as a wideband in‐phase/differential power divider/combiner, which are essential for many RF and microwave subsystem designs. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3271–3274, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23926
Novel compact meander‐slot DGS with high quality factor
Authors: Zhu Yizhi , Zhang Xiaojuan , Li Chao , Li Fang , Fang Guangyou 
Published: September 2008

AbstractThis article presents a novel meander‐slot defected ground structure (DGS) for microstrip lines. Compared with conventional DGSs, the meander‐slot DGS takes more compact size, provides steeper band rejection property and has higher quality factor (Q factor). A meander‐slot DGS resonated at 3.851 GHz is illustrated and its Q factor reaches 22.39. Characteristics of this kind of DGS are investigated with variable dimension parameters. Finally, a narrow‐band stop filter based on cascaded meander‐slot DGSs is designed and fabricated. The measured results indicate that this filter provides sharp narrow‐band‐rejection from about 3.7–4 GHz, which shows good agreement with simulation. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3128–3131, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23940
3D EIT for breast cancer imaging: System, measurements, and reconstruction
Authors: Ye Gang , Lim Kim Hwa , George Rhett T. , Ybarra Gary A. , Joines William T. , Liu Qing Huo 
Published: September 2008

AbstractElectrical impedance tomography (EIT) is a developing imaging modality for early detection of breast cancer. In an EIT system, a low‐frequency current is applied sequentially between different electrode pairs while voltage measurements are made at other electrodes to arrive at the electrical impedance values. The set of impedance measurement data is then computed to produce a 3D electrical conductivity map of the volume to be imaged. In this work, the design, measurements, and inversion of a full 3D EIT system are discussed. Experimentally determined EIT images of phantom objects are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3261–3271, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23932
Wide‐locking range divide‐by‐4 injection‐locked frequency dividers
Authors: Jang S.‐L. , Liu C.‐C. 
Published: September 2008

AbstractThis article studies two wide‐locking range divide‐by‐4 injection locked frequency dividers (ILFDs) employing tunable active inductor (TAI), which are used to extend the locking range and to reduce die area. The CMOS differential ILFD is based on a TAI‐C tank Colpitts voltage‐controlled oscillator (VCO). The quadrature ILFD uses TAI‐C tanks and cross‐coupled switching pairs, the dynamic threshold MOSFETs (DTMOSs) are used to lower the supply voltage and power consumption. The ILFDs were fabricated in the 0.18‐μm 1P6M CMOS technology. At the supply voltage of 1.8 V, at the incident power of 0 dBm the locking range in the Colpitts ILFD in the divide‐by‐4 mode is about 5.45 GHz, from the incident frequency 3.75 to 9.2 GHz. The core power consumption is 4.93 mW. At the supply voltage of 1.4 V, at the incident power of 0 dBm the locking range in the QILFD in the divide‐by‐4 mode is about 7.41 GHz (103.6%), from the incident frequency 3.45–10.86 GHz. The core power consumption is 7.56 mW. The die area is 0.541 × 0.534 mm2. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3229–3232, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23933