bluuebunny/crossref_metadata_2025_split huggingface dataset:
A design of low‐profile triband antenna for emergency call system application
Authors: Kim Jeong‐Hoo , Kim Dong‐Zo , Lee Moon‐Que , Min Sang‐Bo , Lee Han‐Lim , Yu Jong‐Won 
Published: October 2011

AbstractThis article presents a design of a low profile triband antenna operating at three frequency bands (900, 1575, and 1800 MHz). The proposed antenna consists of two curved folded dipoles, a ceramic patch antenna, and a diplexer. Having the proposed antennas uniquely shaped, the total dimension of the structure requires very small space. The antenna shape is designed to improve the overall performance and the spatial efficiency. A diplexer following two folded dipole antennas can transfer the signal by using only one cable and thus, a great portion of the cost required for real application can be reduced. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2798–2801, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25580
Cavity backed dual slot antenna for gain improvement
Authors: Li Jin Xin , Luo Guo Qing , Liang Yaping , Li Wen Jun , Dong Lin Xi , Sun Ling Ling 
Published: October 2011

AbstractA simple method of gain improvement for the cavity backed slot antenna based on the substrate integrated waveguide technique has been presented in this article. By using dual slot at the cavity edges to substitute a single slot at the cavity center as the radiating element, gain of the cavity backed slot antenna has been improved about 1.7 dB whereas its total size is little reduced. The proposed antenna has high radiation performance and keeps the advantages low profile, easy integration, and low cost fabrication. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2767–2769, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25582
Implementation and investigation of a dual‐frequency antenna
Authors: Hong Tao , Gong Shu‐Xi , Liu Ying , Xu Yun‐Xue 
Published: October 2011

AbstractThe planar rectangular split‐ring resonator is applied to design the printed dipole antenna with a requirement of dual frequency in this letter.A dual‐frequency antenna example is given, which works at 1.7 and 4.0 GHz. Any pair of working frequencies can be obtained by the presented technique. The antenna is simulated and fabricated. Its radiation characteristics including impedance bandwidth, radiation patterns, and gain are simulated, measured, and compared. The presented antenna has attractively good performances that the radiation patterns at dual frequencies are both dipolar. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2765–2767, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25583
Multiple carrier ultra‐wideband systems using an optical pulse modulation scheme
Authors: Lin Wen‐Piao , Hsu Yu‐Fang 
Published: October 2011

AbstractThis study proposes a new optical pulse modulation scheme for multiple carrier ultra‐wideband (MC‐UWB) wireless systems to achieve a reliable high‐bit‐rate transmission. The scheme can decrease the system complexity and lowering cost. Moreover, the UWB receiver is adapted with a modified single‐user correlation detector to recover original data signal by a narrow carrier spacing. Finally, we set up a practical experimental system to prove our proposed scheme. Experiment results demonstrate that the scheme can provide high spectral efficiency and reduce interference noise for MC‐UWB wireless communications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2735–2738, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25584
A dual‐band divide‐by‐2 injection locked frequency divider in 0.35‐μm SiGe BiCMOS
Authors: Jang Sheng‐Lyang , Shih Chih‐Chieh , Chang Chia‐Wei , Liu Cheng‐Chen , Huang Jhin‐Fang 
Published: October 2011

AbstractA fourth order resonator has been implemented to design an injection locked frequency divider (ILFD) implemented in a 0.35‐μm SiGe 3P3M BiCMOS process. The ILFD is realized with a cross‐coupled HBT LC‐tank oscillator with switched varactor bias for frequency band selection. The LC tank is a 4th order resonator and it can operate with two tunable frequency bands. Measurement results show that at the supply voltage of 1.25 V, the free‐running frequency can be from 3.22 (6.76) to 3.41 (7.53) GHz for the low‐(high‐) frequency band. The divide‐by‐2 operational locking range can be from 6.3 (12.8) to 6.95 (15.3) GHz for the low‐(high‐) frequency band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2762–2765, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25586
High‐gain, short‐circuited six‐monopole‐antenna system for concurrent, dual‐band WLAN access points
Authors: Su Saou‐Wen 
Published: October 2011

AbstractA high‐gain, short‐circuited multimonopole antenna system for wireless access points in the concurrent 2.4 and 5 GHz WLAN bands is presented. The antenna system mainly comprises a circular antenna ground and six short‐circuited, single‐band monopole antennas, among which the three antennas are designated for 2.4 and 5 GHz operation respectively. The monopole antennas are set in a sequential, rotating arrangement on the antenna ground, and the 2.4 and 5 GHz antennas are facing each other one by one. Experimental results show that well port isolation can be obtained between the antenna ports with high‐gain properties over the 2.4 and 5 GHz bands. A design prototype is elaborated and discussed in the article. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2728–2732, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25588
Wideband and low‐profile antenna for mobile terminals
Authors: Zhao Anping 
Published: October 2011

AbstractIn this article, a low‐profile and wideband antenna for mobile terminal is proposed by using a unique direct feed approach.In particular, the approach consists of a cut, a patch, and two vertical slots. It is found that both the patch and slot play an important rule in improving the impedance bandwidth of the antenna. Antenna prototypes were made and good agreement between the simulation and measurement results were obtained. The measured impedance bandwidth of the antenna at −6 dB level is from 0.78 to 3.95 GHz, which is sufficient to cover most of the current radio systems. In addition, a frequency‐notched operation can be easily achieved by opening an extra slot on the ground plane. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2724–2728, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25589
Compact wideband circularly polarized rectangular dielectric resonator antenna with dual underlaid hybrid couplers
Authors: Pan Yongmei , Leung Kwok Wa , Lim Eng Hock 
Published: October 2011

AbstractA compact wideband circularly polarized rectangular dielectric resonator antenna (DRA) with dual underlaid hybrid couplers is investigated for the first time.As no extra footprint is needed for the couplers, the proposed antenna is very compact. The dual hybrid couplers are connected to generate four quadrature signals that are fed to four sequentially rotated excitation strips stuck on the four side walls of the DRA. It is found that the 3‐dB axial‐ratio bandwidth of the proposed antenna can be as wide as 27.7%. The reflection coefficient, radiation pattern, and antenna gain of the proposed antenna are studied, and reasonable agreement between the measured and simulated results is observed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2789–2791, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25591
Band‐notched design of the planar monopole antenna for WLAN/WiMAX applications
Authors: Chen Kang‐Kang , Zhao Ji‐Xiang 
Published: October 2011

AbstractA simple printed monopole antenna with tunable slots is proposed for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications.The antenna structure consists of a semicircular ground and a rectangular patch with four round corners. By etching a couple of slots in the patch, the notched band from 3.7 to 4.8 GHz can be obtained. Furthermore, by adjusting the length and position of the slot, we make the notched band tunable both the center frequency and bandwidth. The proposed antenna is successfully designed and measured. The measured 10 dB bandwidth for return loss covers both the 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2782–2786, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25593
A novel miniature monopole tag antenna for passive UHF RFID applications
Authors: Liu Hsien‐Wen , Ku Chia‐Hao , Yang Chang‐Fa , Wang Te‐Shun 
Published: October 2011

AbstractA novel miniature monopole tag antenna for passive Ultra‐High Frequency (UHF) radio frequency identification (RFID) operation is presented.The antenna possesses a two‐sided structure that is printed on an FR4 substrate and fed by a 50‐Ω microstrip line. By properly using helical strips and vias, the antenna size can be reduced to a small volume of 10 (L) × 9.5 (W) × 0.8 (H) mm3 to be easily integrated within various portable devices. A miniaturized quasi‐lumped circuit is also designed to attain a good impedance matching between the antenna and the chip. Experimental results demonstrate that the antenna has a suitable operating band about 914–939 MHz and also quite omnidirectional radiation pattern with appreciable gain. Moreover, the proposed compact tag antenna, capable of achieving a maximum readable range of about 5.6 m with an EIRP equal to 4 W, is well suited for RFID applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2770–2772, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25596
Compact dual‐band bandpass filter based on stepped impedance resonators and T‐shaped line
Authors: Feng Wenjie , Xue Quan , Che Wenquan 
Published: October 2011

AbstractA compact dual‐band bandpass filter (BPF) realized with stepped impedance resonators (SIR) and T‐shaped line is proposed in this article. By appropriately selecting the impedance ratio of the SIR, a passband around at 5.4 GHz can be achieved by the second harmonic frequency of the SIR. In addition, a T‐shaped line is used to replace the quarter‐wavelength line between the two SIRs, and another passband at 2.45 GHz is realized between the transmission zeros created by the central open stub of the T‐shaped line and the fundamental frequency of the SIR. Moreover, the transmission zeros created by the central open stub and SIR could also be used to improve the skirt selectivity of the proposed BPF. Good agreement can be observed between the measured and simulated results, demonstrating the validity of the design strategies. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2721–2724, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25599
An intrusion detection sensor based on coherent optical time domain reflector
Authors: Hong Xiaobin , Guo Hongxiang , Wu Jian , Xu Kun , Zuo Yong , Li Yan , Lin Jintong 
Published: October 2011

AbstractA distributed fiber optic intrusion detection sensor is proposed, in which a nonbalanced Mach‐Zehnder interferometer is used as phase demodulator, and an optical time domain reflectometer is used as a position detector. The experimental results concluded that the positioning error of ±25m can be achieved along an 8.8‐km single mode fiber. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2746–2748, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25602
A novel multipassband filter using asymmetric radial stubs
Authors: Sun Xiaofeng , Tan Eng Leong 
Published: October 2011

AbstractThis article presents a novel multipassband filter using asymmetric radial stubs.Asymmetric radial stubs are formed from two single‐radial stubs in different dimensions. The transmission zeros of such asymmetric structure can be controlled by the respective radial stub. By using these asymmetric radial stubs, the transmission zeros of the filter are realized. The multipassband of this filter includes a low‐pass band up to 2.66 GHz and another passband from 5.6 to 6.4 GHz. This filter has the attractive advantage of sharp rejection in the stopband. A demonstration filter is designed, fabricated, and tested. The simulated and measured results are presented. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2819–2821, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25609
Ultra‐wideband monocycle generation by using electroabsorption modulator and polarization differentiation method
Authors: Cheng Wen , Ye Chenhui , Zhu Kun , Fu Hongyan , Chen Biao 
Published: October 2011

AbstractA novel scheme of ultra‐wideband pulse generation is proposed and experimentally demonstrated. The scheme is based on polarization differentiation control in an electroabsorption modulator. The optical structure is simple. Ultra‐wideband monocycle pulses with a 10‐dB bandwidth of 8.0 GHz have been generated. This generation system has the potential for large bandwidth, low‐voltage operation. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2817–2819, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25610
Designing a very wide stopband microstrip bandpass filter with patterned ground plane
Authors: Tang Ching‐Wen , Hsu Yen‐Kuo 
Published: October 2011

AbstractIn this article, a microstrip bandpass filter with a very wide stopband is provided.Based on our previous published ultra‐wide stopband bandpass filter, this proposed filter can extend the stopband range by adopting the patterned ground plane. The full‐wave electromagnetic simulator IE3D is used, and the prototype of the bandpass filter is fabricated and measured. Comparisons of simulated results and experimental data are shown; moreover, good match validates the proposed filter. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2845–2847, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25611
Wide bandwidth, high‐gain slot‐loaded rectangular microstrip antennas
Authors: Maddani G. P. , Sameena N. M. , Mulgi S. N. 
Published: October 2011

AbstractThe effect of slot on patch and on ground plane of rectangular microstrip antenna for effective size reduction, wide bandwidth, and high gain has been presented. A 60.57% of virtual size reduction is achieved by taking ground plane same as that of patch on another similar substrate and by keeping 1‐mm air gap between them. Furthermore, 51% of bandwidth and 8.73 dB of gain are achieved by embedding group of slots on the patch, wide slot on the ground plane and by doubling the thickness of substrate. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2841–2845, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25612
Efficient high gain with low sidelobe level antenna structures using circular array of square parasitic patches on a superstrate layer
Authors: Gupta R. K. , Mukherjee J. 
Published: October 2011

AbstractThis article proposes efficient high gain with low sidelobe level (SLL) antenna structures using circular array of square parasitic patches (CASPPs) for wireless applications. The antenna structure consists of a microstrip antenna that feeds a CASPP fabricated on a low cost FR4 superstrate. The patches on superstrate are suspended in air at about λo/2. The structure with 19‐element CASPPs is designed, fabricated, and tested. The measured VSWR is <2 over 5.725–5.875 GHz frequency band. The antenna with a single square patch provides a gain of 12.6 dB; whereas, the antenna with 19‐element CASPPs provides a gain of 18.3 dB with 93.4% efficiency, SLL of −26.1 dB, and front to back lobe ratio of >20 dB. Antenna with CASPPs on finite ground requires 25% less ground plane size as compared to planar array. The proposed structure can be packaged inside an application platform. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2812–2817, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25613
Compact dual‐band multiple input multiple output antenna with high isolation performance
Authors: Yeom Insu , Jung Chang Won 
Published: October 2011

AbstractA compact dual‐band (WLAN 11b; 2.4 GHz ∼ 2.5 GHz, 11a; 5.15 GHz ∼ 5.825 GHz) 2‐channel Multiple Input Multiple Output (MIMO) antenna for portable media player (PMP) applications is presented. The proposed antenna is composed of a planar inverted F‐shape antenna (PIFA) operating at 2 GHz band and a loop antenna operating at 5‐GHz band. The antenna made up of the composite loop and PIFA antenna (CLPA) with connecting line face to the feed point and is orthogonally arranged at the edge of the ground plane for reducing mutual coupling. The antenna shows polarization and pattern diversities with excellent isolation characteristics. The two antennas were connected with each other in the bottom side to improve the isolation at 5‐GHz band. The proposed antenna has a sufficient gain in WLAN service band and is compact sized for the PMP applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2808–2811, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25614
Broadband two‐port X antenna array with flat reflector for polarization diversity applications
Authors: Hristov Hristo D. , Carrasco Hector , Feick Rodolfo , Kirov G. S. 
Published: October 2011

AbstractThis paper describes a new low‐profile X antenna array separated 0.1–0.15 wavelengths from a flat or rimmed square reflector of 0.6 wavelengths in size. The array consists of two closely spaced elements: an active two‐port folded‐wire X antenna, which radiates two cross‐polarized fields and a passive X element. This very compact double X reflector antenna has around 8–9 dBi peak directive gain, 12.5% bandwidth on average around the design frequency of 1800 MHz, a high interport isolation (about 25–30 dB) and low cross‐polarization in the whole input‐match frequency range. The practical applications of the properly designed and tuned double X reflector antenna may include among others, base station antennas with polarization diversity for GSM PCS or DCS bands, or for the whole UMTS band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2833–2837, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25616
Tunable meander‐type antenna integrated with a bluetooth module in PCB board
Authors: Yoon Joong Han , Lee Young Chul R. 
Published: October 2011

AbstractIn this paper, a tunable antenna integrated with a Bluetooth module in printed circuit board (PCB) board for Bluetooth application was proposed and experimentally studied.The proposed tunable antenna consisted of meander‐type stack antenna, Bluetooth module, strip line, and chip capacitors in PCB board. The simulation results for the effect of the variation of chip capacitor in PCB board for Bluetooth application were investigated. From the experimental results, the measured impedance bandwidth, defined by VSWR = 2, was obtained. Also, 3D radiation patterns and peak and average gains were measured and studied. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2801–2804, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25618
On‐board 7‐band WWAN/LTE antenna with small size and compact integration with nearby ground plane in the mobile phone
Authors: Wong Kin‐Lu , Tu Ming‐Fang , Wu Chun‐Yih , Li Wei‐Yu 
Published: October 2011

AbstractA small‐size on‐board 7‐band WWAN/LTE antenna formed by a coupled‐fed loop antenna connected with a chip‐inductor‐loaded strip is presented. The antenna is disposed on a small board space of 15 × 25 mm2 (375 mm2) on the system circuit board and provides two wide operating bands to respectively cover GSM850/900 (824–960 MHz) and GSM1800/1900/UMTS/LTE2300/2500 (1710–2690 MHz) for the 7‐band operation in the mobile phone. The antenna's upper band is contributed by the coupled‐fed loop antenna operated at its 0.5‐wavelength resonant mode. The generation of the lower band is owing to the chip‐inductor‐loaded strip connected to the coupled‐fed loop antenna to form a coupled‐fed shorted monopole antenna operated at its 0.25‐wavelength resonant mode. In addition, the antenna's lower and upper bands can be respectively controlled, making it easy in fine‐tuning the desired operating bandwidths in practical applications. Further, the proposed antenna can be in compact integration with its nearby ground plane on the system circuit board; that is, small isolation distance between the antenna and the nearby ground plane can be achieved for the proposed antenna. This leads to efficient board space planning on the system circuit board of the mobile phone. Details of the proposed antenna are described in the article. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2847–2853, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25619
Simultaneous fat suppression and band reduction with large‐angle multiple‐acquisition balanced steady‐state free precession
Authors: Quist Brady , Hargreaves Brian A. , Cukur Tolga , Morrell Glen R. , Gold Garry E. , Bangerter Neal K. 
Published: October 2011

AbstractBalanced steady‐state free precession (bSSFP) MRI is a rapid and signal‐to‐noise ratio‐efficient imaging method, but suffers from characteristic bands of signal loss in regions of large field inhomogeneity. Several methods have been developed to reduce the severity of these banding artifacts, typically involving the acquisition of multiple bSSFP datasets (and the accompanying increase in scan time). Fat suppression with bSSFP is also challenging; most existing methods require an additional increase in scan time, and some are incompatible with bSSFP band‐reduction techniques. This work was motivated by the need for both robust fat suppression and band reduction in the presence of field inhomogeneity when using bSSFP for flow‐independent peripheral angiography. The large flip angles used in this application to improve vessel conspicuity and contrast lead to specific absorption rate considerations, longer repetition times, and increased severity of banding artifacts. In this work, a novel method that simultaneously suppresses fat and reduces bSSFP banding artifact with the acquisition of only two phase‐cycled bSSFP datasets is presented. A weighted sum of the two bSSFP acquisitions is taken on a voxel‐by‐voxel basis, effectively synthesizing an off‐resonance profile at each voxel that puts fat in the stop band while keeping water in the pass band. The technique exploits the near‐sinusoidal shape of the bSSFP off‐resonance spectrum for many tissues at large (>50°) flip angles. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc.