bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multiband planar monopole antenna for mobile handsets
Authors: Zhang Zhiya , Fu Guang , Gong Shuxi , Zuo Shaoli , Ran Tao 
Published: August 2010

AbstractA multiband planar monopole antenna with wideband characteristic is proposed for GSM900, DCS1800, PCS1900, UMTS, IMT2000, wireless broadband internet service, WiMAX2350, and WLAN2400 applications.By using a meander structure, L‐shaped slots in the ground plane and tapered feeding line, wideband, and compact size characteristics can be achieved. The proposed antenna occupies an area of 50 × 19.5 mm2 barring the ground plane. Moreover, the antenna can be easily integrated with other parts of the circuits of mobile handsets due to its planar structure. A prototype has been fabricated and tested, and the experimental results validate the design procedure. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2395–2397, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25515
Novel tri‐band whip antenna for handheld radio including GPS band
Authors: Prakash Thakur Jay , Hoon Kim Yang 
Published: August 2010

AbstractNovel tri‐band‐whip antenna is investigated for 800/900 MHz bands digital and analog portable handheld radio application including GPS (1575 MHz) band.The tri‐band characteristics are obtained by including two monopole elements with single feed point. Prototype of the proposed antenna is presented and its detail experimental analysis is described. Antenna parameters such as return loss, efficiency, and radiation gain patterns are measured and compared for various structures of the Whip antenna. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2572–2575, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25516
Slow‐wave fractal‐shaped compact microstrip resonant cell
Authors: Kurgan P. , Kitlinski M. 
Published: August 2010

AbstractA novel fractal‐shaped compact microstrip resonant cell (CMRC) featuring a strong slow‐wave effect has been presented. Its vital usefulness in the process of microstrip line miniaturisation has been proved and experimentally validated on the basis of a compact 3‐dB branch‐line coupler illustrating the possibilities of the approach. A prototype example structure has been designed to mirror the characteristics of a conventional device, simultaneously presenting substantial size reduction. The measured results are in excellent accordance with theoretical characteristics confirming the utility of proposed novel fractal‐shaped CMRC in compact circuits developed in microstrip technology. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2613–2615, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25517
Low protruding monopole antenna with a slot cut in the ground plane for laptop applications
Authors: Huang Chih‐Yu , Tsai Chia‐Chou , Yang Cheng‐Fu 
Published: August 2010

AbstractInvestigations on a dual‐band monopole antenna with a slot cut in the ground plane have been proposed for wireless local area network (WLAN) applications.The proposed antenna has a low protruding profile only 2 mm above the ground plane, thus allowing it to suitably integrate with the supporting metal frame of the laptop display. Good impedance matching can be achieved by adjusting antenna height and choosing adequate cutting slot position and size in the ground plane. It can provide two separate impedance bands for 2.4 and 5.2/5.8 GHz, making it easily covers the required bandwidths for WLAN operation. Details of the proposed antenna design and measured results are presented and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2610–2613, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25518
Wideband planar antenna with modified ground plane
Authors: Owais Owais , Karlsson Magnus , Gong Shaofang , Ying Zhinong , Grudén Mathias , Job Magnus 
Published: August 2010

AbstractIn this article a miniaturized planar antenna is presented for broadband applications. Antenna miniaturization is achieved by modifying the ground plane that creates a different current path thus increasing the effective dimension of the antenna. In addition, dual chopping, slitting, and radiator position offsetting provide wideband behavior and relatively good impedance matching. The low profile antenna with its wide bandwidth, linear phase response and quasi‐omnidirectional radiation pattern is attractive for the existing and future communication devices of small size. Simulated and measured results for the proposed antenna are presented and analyzed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2581–2585, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25519
Ultra wideband bandpass filter using stub‐loaded quintuple‐mode resonator
Authors: Deng Hong‐Wei , Zhao Yong‐Jiu , Zhang Lu , Zhang Xue‐Shun , Zhao Wei 
Published: August 2010

AbstractIn this article, a compact ultra wideband (UWB) bandpass filter (BPF) with sharp rejection skirt is realized using quintuple‐mode stub‐loaded resonator.The resonator can generate three odd‐modes and two even‐modes in the desired band. By simply adjusting the lengths of open stubs in shunt and short‐circuited stubs, the first five resonant modes of the resonator can be roughly allocated within the 3.1–10.6 GHz UWB band meanwhile the sixth resonant mode in the upper‐stopband can be suppressed. The pair of short stubs can generate two transmission zeros near the lower and upper cut‐off frequencies, leading to a sharp rejection skirt. Finally, a quintuple‐mode UWB BPF is designed and fabricated and the measured results demonstrate the feasibility of the design process. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2579–2580, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25520
Triple‐band antenna with slots for PCS/WLAN/UWB applications
Authors: Kim Ji Hae , Lee Jung Nam , Park Jong Kweon 
Published: August 2010

AbstractA novel triple‐band antenna with H‐ and U‐shaped slots is proposed for personal communication system/wireless local area network/Ultra‐wideband (PCS/WLAN/UWB) operations.The proposed antenna has a trapezoidal patch, H‐ and U‐shaped slots, CPW feeding, and a stub for impedance matching. We have used the trapezoidal patch and a stub to produce the UWB frequency band and H‐ and U‐shaped slots to produce the PCS and WLAN bands, respectively. Prototypes of the proposed antenna have been successfully implemented and good radiation characteristics in the operating frequency bands have been achieved. Parametric studies are also presented and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2540–2544, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25522
Contactless monitoring of Si substrate permittivity and resistivity from microwave to millimeter wave frequencies
Authors: Elhawil A. , Neve C.Roda , Olbrechts B. , Huynen I. , Raskin J.‐P. , Poesen G. , Stiens J. , Vounckx R. 
Published: August 2010

AbstractA contactless and nondestructive technique is employed for characterizing single‐sided metallised silicon wafers. The reflection spectra are measured using a quasi‐optical millmeter‐wave setup in the frequency range 40–320 GHz. The results are compared with those provided by the coplanar waveguide method, in terms of accuracy and range of applicability. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2500–2505, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25524
Small‐size 11‐band LTE/WWAN/WLAN internal mobile phone antenna
Authors: Chen Shu‐Chuan , Wong Kin‐Lu 
Published: August 2010

AbstractThis work presents an internal mobile phone antenna occupying a small board space of 600 mm2 on the system circuit board and providing three wide operating bands of at least 698–960, 1710–2690, and 5150–5825 MHz for the 11‐band long term evolution (LTE)/ wireless wide area network (WWAN)/wideband local area network (WLAN) operation.This includes three LTE bands of LTE700/2300/2500, five WWAN bands of GSM850/900/1800/1900/UMTS, and three WLAN 2.4/5.2/5.8 GHz bands. The antenna is a coupled‐fed shorted monopole, with a wide feeding strip in the coupling feed, a long shorting strip closely coupled to the shorted monopole, and a tuning stub connected to the shorting strip. The antenna's three wide operating bands are achieved and controlled by tuning the width of the feeding strip, the gap between the shorting strip and the shorted monopole, and the dimensions of the tuning stub. Operating principle of the proposed antenna is described in detail in this article. Results of the fabricated antenna are presented and discussed. The specific absorption rate results of the antenna with the presence of the user's head and hand are also studied. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2603–2608, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25526
A low voltage folded cascode LNA for ultra‐wideband applications
Authors: Khemchandani Sunil L. , Ramos‐Valido Dailos , García‐Vázquez Hugo , Pulido‐Medina Ruben , del Pino Javier 
Published: August 2010

AbstractA low noise amplifier scheme to achieve low‐voltage and wide‐bandwidth operation is presented. This circuit is based on folded cascode topology combined with wideband impedance matching and shunt peaking load. One of the drawbacks of the proposed scheme is that it uses more area than the conventional cascode due to the two additional inductors and capacitors to implement the capacitively coupled LC tanks. To reduce the area of the circuit, we have used stacked inductors, a brief study of these kinds of inductors is presented. Two low noise amplifiers have been fabricated using a mature 0.35 μm BiCMOS technology, one using the cascode conventional approach and the other using the proposed topology. Measurement results show that for the same transistors operating conditions, the low‐voltage amplifier performance is similar than the conventional cascode. By virtue of the small area of stacked inductors, the size of both low noise amplifiers is comparable. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2495–2500, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25530
A new ultra‐wideband radar for detecting survivors buried under earthquake rubbles
Authors: Lv H. , Lu G. H. , Jing X. J. , Wang J. Q. 
Published: August 2010

AbstractExisting ultra‐wideband (UWB) radars for buried survivor detection operated at high center frequencies and had limited penetration capability.A new UWB radar operating at a center frequency of 500 MHz is developed in this article. The experimental results show that it can detect the respiration of human subjects lying under a simulated earthquake rubble of about 2 m in thickness. Thus this new radar is practicable and promising for detecting buried survivors after an earthquake. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2621–2624, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25539
Employing complementary split‐ring resonators for the wide stopband microstrip lowpass filter design
Authors: Tang Ching‐Wen , Yang Shih‐Chin 
Published: August 2010

AbstractIn this article, a novel microstrip lowpass filter with complementary split‐ring resonators (CSRRs) is presented.By properly controlling the width of the transmission line and rotating the angle of CSRRs, a wide stopband with sufficient rejection level can be achieved. The full‐wave electromagnetic simulator IE3D is used; moreover, the prototypical microstrip lowpass filter is fabricated and measured. Simulated results and experimental responses are compared; moreover, the match between simulation and measurement validates the proposed structure. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2592–2594, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25541
Ku‐band multiway rectangular waveguide power divider
Authors: Song Kaijun , Fan Yong , Zhang Bo 
Published: August 2010

AbstractA novel multiway rectangular waveguide power divider using coaxial probe array has been presented. The model of the entire power divider has been introduced, and the effect of the higher order modes generated in the power divider has been discussed. A Ku‐band eight‐way rectangular waveguide power divider has been designed and fabricated. Good agreement between the simulated response and measurements was demonstrated. The measured 15‐dB return loss and 1‐dB insertion loss bandwidth of the power divider are all found to be about 7 GHz. The power divider developed is suitable for various applications of wide bandwidth. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2560–2563, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25542
UWB bandpass filter with notched band and improved upper stopband characteristics
Authors: Lee Jae Kwan , Kim Youngsik 
Published: August 2010

AbstractIn this article, we propose a novel ultra‐wideband bandpass filter with an improved upper stopband characteristic and a notched band. The proposed BPF is composed of a coupled double‐step impedance resonator, an interdigital slot, a dumbbell‐shaped defected ground, and an open‐loop defected ground. The measured results show a minimum insertion loss of 0.61 dB at 7.02 GHz except about 5 GHz for the WLAN band and a wide upper stopband with more than 30 dB attenuation at up to 20 GHz. The group delay variation in the passband is less than 0.4 ns. In addition, the proposed BPF has a compact size. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2520–2522, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25544
Dual‐band hybrid coupler with source to load impedance matching
Authors: Cheung King Yin , Zheng Shao Yong , Chan Wing Shing , Man Kim Fung 
Published: August 2010

AbstractA novel dual‐band hybrid coupler with source to load impedance transformation is presented together with detailed design formulas.Previous couplers were either dual‐band or impedance transforming but not both. A dual‐band impedance transforming coupler is designed accordingly for demonstration. Experimental results obtained agree well with both the numerical and simulated results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2515–2519, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25545
Compact groove‐loaded triband antenna for WLAN/WiMAX applications
Authors: Huang J.‐X. , Zhang F.‐S. , Zhang F. , Wang Y. , Yang Y.‐B. , Dong K. 
Published: August 2010

AbstractA novel compact triband monopole antenna loaded with grooves for WLAN/WiMAX applications is proposed. Basically, the antenna structure is based on a pentagon‐shaped radiator and a coplanar waveguide feeding structure. Through introduction of four different grooves into the radiator and coplanar grounds, the antenna achieves triple band characteristics with a compact size of 20 × 30 × 1.6 mm3. As an investigation, an analysis of the grooves shows some important features affecting the impedance characteristics. Prototypes of the proposed antenna are fabricated and measured. Numerical and experimental results demonstrate that the proposed antenna satisfies the −10 dB impedance bandwidth requirements while covering the WLAN and WiMAX bands simultaneously. Meanwhile, radiation performances of the antenna in the operation bands are also observed and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2588–2592, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25548
Hexagonal patch antenna with T‐shaped slot for frequency switching and conical radiation
Authors: Zhao Kainan , Chen Wenhua , Sun Jiawen , Feng Zhenghe 
Published: August 2010

AbstractA compact hexagonal patch antenna with T‐shaped slot for frequency switching and conical radiation is presented in this article.By utilizing a PIN diode to change the configuration of the slot, two frequency bands centered at 2.29 and 2.11 GHz, respectively, are achieved. Moreover, approximations to conical beam patterns at the two frequency bands are obtained. The proposed antenna is promising for wireless communication applications because of its low profile, switchable resonant frequency, and omnidirectional radiation characteristics. Detailed design of the proposed antenna including the implementation of PIN diode is described. Measured and simulated results are also shown and discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2585–2588, 2010; View this article online at wileyonlinelibrary.com.. DOI 10.1002/mop.25549
A novel compact monopole slot antenna with controllable band‐notched characteristic for UWB applications
Authors: Liu Hsien‐Wen , Ku Chia‐Hao 
Published: August 2010

AbstractA novel planar monopole slot antenna that possesses a controllable band‐notched property for ultra‐wideband (UWB) applications is presented. The antenna, which consists of a square slot patch with a vertical coupled strip, only occupies a small size of 15 (L) × 15 (W) × 1.6 (H) mm3. By properly inserting a thin gap between the coupled strip and the slot patch, the antenna can achieve a wide bandwidth covering 3.05–11.15 GHz with a sharp rejection band of 5.12–6.08 GHz, where the frequency rejection performance can be controlled flexibly by employing various strip widths and thin gaps. Good measured omnidirectional radiation patterns and transmission responses also indicate that the proposed antenna is well suitable for UWB operation. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2624–2627, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25550
MIMO antenna using a decoupling network for 4G USB dongle application
Authors: Han Minseok , Choi Jaehoon 
Published: August 2010

AbstractA compact MIMO antenna using a decoupling network for 4G USB dongle application is proposed. The proposed MIMO antenna consists of two parallel folded monopole antennas with the length of 100 mm and a decoupling network. To improve the isolation characteristic at the LTE band 13, a decoupling network was added between the two antennas placed close to each other. The decoupling network is simple and compact and consists of two sections of transmission line, a shunt reactive component and quarter‐wavelength jointed shorting structure. The proposed MIMO antenna has the isolation less than −15 dB at the LTE band 13 and the ECC is lower than 0.4 over the whole LTE band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2551–2554, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25551
Compact ultra‐wideband filter with dual notched bands based on complementary split ring resonators
Authors: Chu Qing‐Xin , Huang Jian‐Quan 
Published: August 2010

AbstractA compact ultra‐wideband (UWB) bandpass filter (BPF) with double notched bands is presented in this article.The proposed BPF comprises one T‐shaped multiple modes resonator and two microstrip‐CPW transition structures etched with different complementary split ring resonators (CSRRs). A CSRR etched on the coupled surface is adopted to produce narrow stop band with high rejection level. Its notched response can be mainly controlled by tuning the length and width of the gap of the CSRR. The fabricated BPF achieved dual notched bands at 5.3 and 5.775 GHz with 10 dB rejection bandwidth of 4.5 and 2.6%, and rejection level of 21.49 and 17.35 dB, respectively. The proposed notched UWB BPF has the advantages of compact size, good selectivity, and flat group delay. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2509–2512, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25554
Monocytes from children with clinically stable cystic fibrosis show enhanced expression of Toll‐like receptor 4
Authors: Sturges Nina C. , Wikström Matthew E. , Winfield Kaye R. , Gard Samantha E. , Brennan Siobhain , Sly Peter D. , Upham John W. ,   on behalf of AREST CF
Published: August 2010

AbstractLung disease in patients with cystic fibrosis (CF) is characterized by recurrent bacterial respiratory infections and intense airway inflammation. Pattern recognition receptors such as Toll‐like receptor 2 (TLR2) and TLR4 identify bacterial pathogens and activate the innate immune response. We therefore hypothesized that increased expression of these receptors would be found on circulating immune cells from children with CF. A cohort of 66 young children (median age 3 years) with CF was studied and compared to both healthy controls (n = 14) and children without CF who were being investigated for recurrent respiratory infections (non‐CF disease controls; n = 17) of a similar age. Surface expression of TLR2 and TLR4 on peripheral blood monocytes was analyzed using flow cytometry. TLR4 expression was significantly higher in patients with CF compared to healthy controls (P = 0.017) and non‐CF disease controls (P = 0.025) but did not vary according to the presence or absence of pulmonary infection with Gram‐negative or Gram‐positive bacteria (P = 0.387) in the CF group. In contrast, TLR2 expression was similar across all three study groups (P = 0.930). The increased surface expression of TLR4 seen in young children with CF appears to be related to having CF per se and not related to current pulmonary infection. Pediatr. Pulmonol. © 2010 Wiley‐Liss, Inc.
The feasibility and validity of forced spirometry in ataxia telangiectasia
Authors: Vilozni Daphna , Berkun Yakov , Levi Yonit , Weiss Batya , Jacobson Jeffrey M. , Efrati Ori 
Published: August 2010

AbstractObjectivesTo explore the feasibility and validity of forced spirometry in patients with ataxia telangiectasia (A‐T).Study designTwenty‐eight patients (aged 3.7–19.3 years) performed spirometry on 47 occasions. Parameters studied were technical quality and relation to: predicted values, pulmonary illness.ResultsStart of test criteria for correct expiratory effort was significantly prolonged (183 ± 115 ms; P < 0.001). The rise‐time to peak flow in children free of respiratory symptoms (Group‐FRS; n = 8) increased by 16.2 ± 12.5 ms/year above recommended and in children having recurrent infections (n = 8) 30.4 ± 16.1 ms/year, P < 0.01. Expiration‐time was significantly shorter than requested (1.21 ± 0.47 sec) and was ended abruptly in 57% of the patients. FEV1 could not be established by 8/20 patients. The intra‐subject reproducibility met criteria (4.4 ± 2.7%, 5.2 ± 2.8%, 2.9 ± 3.2%, 6.3 ± 5.3%, for FVC, FEV0.5, PEF, FEF25–75, respectively). Group‐FRS showed yearly deterioration in FVC of 2.2%, while patients with hyper‐reactive airways (Group‐HRA; n = 12) had a deterioration rate of 3.6%/year. FEV0.5 deterioration rate was similar in both groups (2.2 and 2.0, respectively), but baseline values in Group‐HRA were significantly lower than those of Group‐FRS (P = 0.029) in similar young ages, indicating airway obstruction at early ages in Group‐HRA. FEV0.5 values deterioration also correlated with body mass index (P < 0.017).ConclusionForced spirometry in A‐T patients is reproducible and has a distinct pattern, although curves do not meet other recommendations for acceptable criteria. The study insinuates that a rapid deterioration in lung function occurs in A‐T patients with recurrent respiratory infection, suggesting that early intervention may prevent further deterioration or improve their lung function. Further studies are needed to confirm our results. Pediatr Pulmonol. 2010; 45:1030–1036. © 2010 Wiley‐Liss, Inc.