bluuebunny/crossref_metadata_2025_split huggingface dataset:
Adjustable fluidic lenses for correcting piston/defocus/astigmatism aberrations induced by MEMS deformable mirrors
Authors: Fuh Yiin‐Kuen , Hsu Kuo‐Chan , Lin Ming‐Xin , Fan Jia‐Ren 
Published: April 2012

AbstractAn adjustable fluidic lens is typically utilizing curvature change and is promising to correct the aberrations such as piston, defocus, and astigmatism. In this article, capability of adjustable fluidic lenses to correct the induced wavefront aberrations is investigated systematically, with particular attention placed on interpretation of Zernike modes and exploration of the potentials of fluidic lenses. In addition, aberrations are expressed in Zernike polynomials and the first six modes commonly encountered in ophthalmology are carefully examined. Three different wavefront aberrations are intentionally induced by a commercial micro‐electrical‐mechanical systems (MEMS) deformable mirrors (DM) with 140 actuators. The optical properties of fluidic lenses corrections are characterized by Shack–Hartmann measurements. Experimental results show that piston mode (Z1) can be significantly improved from 0.972 to −0.031 μm using fluidic lenses by injecting DI water as little as 0.02 ml (resultant meniscus curvature is 392.8 mm). Similar improvements can be found in defocus (Z5)/astigmatism (Z6) and aberrations are reduced for both modes from −0.15 μm/−0.48 μm to 0.02 μm/0.085 μm, respectively. When injected volume of 0.1 ml (resultant meniscus curvature is 78.9 mm), we can experimentally deduce that aberrations of Z3/Z5 induced by MEMS DM at a magnitude of 0.486 μm/−1.472 μm, fluidic lenses can only marginally improved to −0.245 μm/0.305 μm. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1701–1705, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26878
Optical wireless indoor positioning system using light emitting diode ceiling lights
Authors: Jung Soo‐Yong , Hann Swook , Park Suyong , Park Chang‐Soo 
Published: April 2012

AbstractWe proposed an optical wireless position sensing system using light emitting diodes (LEDs), demonstrating it via experiment.During experiment, we used four LED lamps composed of 16 LED chips with a view angle of 65° at half power. Further, we assigned a unique address for each LED lamp, being transmitted using LED properties such as lighting and switching. Afterward, we used correlation to locate the target. The proposed positioning system displayed 4.38 cm of mean distance error among 36 points with dimensions of 1 × 1 × 1.2 m3. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1622–1626, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26880
A dual‐resonance CMOS voltage‐controlled oscillator with enhanced performance through new varactor topology
Authors: Jang Sheng‐Lyang , Cheng Ching‐Lun , Chang Chia‐Wei , Huang Jhin‐Fang 
Published: April 2012

AbstractA new fully integrated, dual‐band CMOS voltage controlled oscillator (VCO) is presented. The VCO is composed of a p‐core cross‐coupled and an n‐core cross‐coupled Colpitts oscillator with dual‐resonance LC tank and was implemented in 90‐nm CMOS technology with 1.15 V supply voltage. The circuit allows the VCO to operate at two resonant frequencies with a common LC tank. This VCO is configured with 6.3 and 10 GHz frequency bands with differential outputs. The dual‐band VCO operates at 6.11–6.413 GHz and 9.72–10.24 GHz. The phase noises of the VCO operating at 9.72 and 6.4 GHz are −116.31 dBc/Hz and −122.79 dBc/Hz at 1‐MHz offset, respectively, while the VCO draws 4/4.28 mA and 4.6/4.92 mW consumption at high/low frequency band from a 1.15‐V supply. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1590–1593, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26882
A design for circularly polarized ring slot antennas backed by thin grounded substrate
Authors: Liu Wang‐Lin , Chen Mu‐Yi , Chen Tsair‐Rong 
Published: April 2012

AbstractThis article presents a design for circularly polarized ring slot antennas backed by a metal plate with a small separated distance.The antenna is excited through a shorted L‐shaped coupling strip, and good circular polarization performance can be obtained as long as the vertical arm of the L‐shaped coupling strip is properly stretched. Both simulated and measured results demonstrate that the reflector‐backed slot antenna gives an opposite polarization sense to its counterpart without the reflector. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1768–1770, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26885
Printed, coplanar, magnetic‐dipole multiantenna system for 5‐GHz wlan applications
Authors: Lee Cheng‐Tse , Su Saou‐Wen 
Published: April 2012

AbstractA printed, three‐magnetic‐dipole antenna system symmetrically placed on a single‐layered FR4 substrate suitable for 5‐GHz WLAN applications is presented. The dipoles are set in a sequential, rotating arrangement on a small substrate with an equal inclination angle to form a symmetrical multiantenna structure. Each antenna occupies an area of 7 mm × 10 mm and is spaced 5.4 mm apart from the adjacent dipole. The magnetic dipole has a U‐shaped radiating arm and is capacitively excited by a driven coupling strip. With a compact size (radius less than 15 mm) of the antenna system, the design yet shows a wide operating band with good port isolation attained. Details of a design prototype are described and discussed in the article. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1726–1731, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26886
A novel scheme for seamless integration of RZ‐DPSK‐DWDM optical links with MIMO‐OFDM system
Authors: Shao Yufeng , Chi Nan 
Published: April 2012

AbstractWe introduce 10 × 10 Gb/s RZ‐DPSK‐DWDM links in the architecture integration of MIMO‐OFDM system. The optical communication performance and wireless communication performance is analyzed in the integrated system. The long distance transmission for RZ‐DPSK WDM is done, and the demodulated RZ‐DPSK signal is transformed to the binary data, which is given to MIMO‐OFDM‐QPSK wireless communication system. Two MIMO‐OFDM‐QPSK wireless system is designed with two transmit antennas and one receive antenna and four transmit antennas and one receive antenna. The BER performance of almost 10−3 is achieved at SNR of 11 dB with four transmit antennas and one receive antenna, which is better when compared to two transmit antennas and one receive antenna. The results prove that seamless integration of RZ‐DPSK‐DWDM optical links with MIMO‐OFDM system is suitable to simultaneously offer higher receiver performance and simplify system configuration for fourth generation wide‐area coverage mobile communication. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1679–1679, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26891
A comparative study of c‐shaped, e‐shaped, and u‐slotted patch antennas
Authors: Bhardwaj Shubhendu , Rahmat‐Samii Yahya 
Published: April 2012

AbstractA class of popular linearly polarized slotted antennas are compared with respect to their RF mechanism, radiation mechanism, impedance matching, and cross polarization characteristics for wireless communication frequency band 1.9–2.4 GHz.It is found that C‐shaped and double C‐shaped patch antennas, even though miniaturized, suffer from narrow bandwidth and high cross polarization level, due to its orientation of slot. U‐slotted and E‐shaped patch antennas show high bandwidth with minor penalty in size and cross polarization level. In order to understand the effect of slot on the radiation in these antennas, a novel strategy of looking at the near‐field of these antennas has been presented. These near‐field plots are analyzed to explain certain far‐field radiation characteristics in these antennas such as‐ cross‐pol level. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1746–1757, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26894
Low‐profile tetra wire‐patch antenna for automotive applications
Authors: Lizzi L. , Ferrero F. , Ribero J. , Staraj R. 
Published: April 2012

AbstractA wire‐patch antenna operating over the terrestrial trunked radio emergency and public safety standard is presented. It exploits the use of shorting wires to operate below its fundamental cavity resonance mode. Thanks to low‐cost, low‐profile, solidity, ease of fabrication, and dipole‐like radiation pattern properties, it results to be particularly suitable for automotive applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1711–1714, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26895
Integral imaging system featuring a seamlessly extended depth of field
Authors: Xu Kai , Hwang Yong‐Seok , Lee Sang‐Shin 
Published: April 2012

AbstractAn integral imaging display system, incorporating three birefringence lens arrays (BLAs) paired with a half‐wave plate (HWP), is proposed to accomplish a seamlessly extended depth of field.The BLAs were built by injecting three different types of liquid crystal into the space between the lens array substrate and glass substrate, and they act either as a concave lens, convex lens, or a transmissive plain homogeneous medium, depending on the light polarization. The HWP is used to adaptively control the polarization of the light impinging on each of the BLAs, to ensure that one of them acts as a concave/convex lens, whereas the others act as a transmissive plain medium. The three BLAs were appropriately aligned to extend the entire depth of field substantially. Consequently, the feasibility of the proposed display system was verified theoretically and experimentally. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1705–1711, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26896
Temperature insensitive bending sensor based on microbending FBG cladding mode recoupling
Authors: Sun An , Wu Zhishen 
Published: April 2012

AbstractA simple fiber Bragg grating (FBG) bending sensor based on microbending induced cladding mode recoupling is presented, in which cladding mode is excited and recoupled through microbending structure in single mode fiber.Experimental results show that the excited counter‐propagation weak cladding mode in microbending FBG is very sensitive to curvature which can be used for temperature independent bending measurement. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1674–1676, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26897
A quasisemicircular wide‐slot antenna with 3.5‐/5.5‐GHz dual band‐notched characteristics for ultrawideband applications
Authors: Yang Yi , Yin Ying‐Zeng , Liu Bo‐Wen , Jing Shao‐Hong 
Published: April 2012

AbstractA novel ultrawideband (UWB) wide‐slot antenna with dual‐notched bands is presented and investigated in this article. The radiator is a quasisemicircular slot excited by a fork‐shaped stub. By introducing an arc‐shaped slot and a pair of arc‐shaped strips on the ground, the 3.5‐ and 5.5‐GHz dual band‐rejected filtering properties for worldwide interoperability for microwave access and wireless local area network signals can be achieved well. Measured results demonstrate that the proposed antenna can operate well over UWB frequency band ranging from 2.85 to over 12 GHz, while providing dual‐notched bands (VSWR > 2) covering 3.23–3.71 GHz and 5.03–6.34 GHz. In addition, nearly omnidirectional radiation patterns, stable gain, and moderate group delay variation can also be observed in the operating bands. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1602–1605, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26901
Stabilization of a fiber fabry‐perot interferometric acoustic wave sensor
Authors: Chen Jianyong , Li Wancai , Jiang Hong , Li Zhenyu 
Published: April 2012

AbstractControl of the operating point of an interferometric optical sensor to produce the highest sensitivity is crucial in the demodulation of interferometric optical sensors to compensate for quadrature point (Q point) mismatching.A new method for operating point control of fiber Fabry‐Perot interferometer was discussed and demonstrated, the relationship of the Fabry‐Perot cavity length, the visibility and the interferometric fringe was analyzed. MCU was introduced to tracing the Q point by changing the laser wavelength through adjusting the light source temperature. It is proved that the dynamic range of the sensor system is surely extended; the NSR could be greatly improved because the wavelength change‐induced noises is greatly limited in this sensor system. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1668–1671, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26902
Tuning of on‐metal UHF RFID inlay tags loaded with a thin magneto‐dielectric slab
Authors: Serra Andrea A. , Guraliuc Anda R. , Nepa Paolo , Manara Giuliano 
Published: April 2012

AbstractThe input impedance of UHF radio frequency identification (RFID) inlay tags is analyzed when a thin material slab is placed between the antenna and a metal surface.The two‐layer slab is made of a thin magneto‐dielectric Emerson&Cuming Eccosorb MCS‐U layer with high permeability/permittivity and a thin Rohacell™ layer. Two common commercial UHF tag antennas are considered: the Alien ALN‐9640 Squiggle® and the ALN‐9654 G inlays. The antenna impedance is evaluated both numerically and experimentally, and the power transmission coefficient is calculated in the whole UHF RFID frequency band. It is shown that a tag nonintrinsically suitable for on‐metal applications (e.g. inlay tags) can be used on a conductive surface in a low‐profile configuration. Indeed, when the above magnetic substrate is used, the antenna input impedance rises up from the very low values induced by the presence of a near conducting surface. Then, with a simple trimming applied to the antenna layout, it is possible to tune the antenna to achieve a conjugate impedance matching with the chip impedance. It is demonstrated how an effective tuning is possible through some simple straight cuts of some antenna parts, without requiring a redesign of a new optimized tag antenna. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1630–1633, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26903
A current‐reused voltage‐controlled oscillator with balanced enlarged amplitude via decoupling capacitance adoption
Authors: Kuo Ko‐Chi , Lin Shun‐Dao , Hou Hsiao‐Han 
Published: April 2012

AbstractThis article presents a low‐power current‐reused voltage‐controlled oscillator (VCO) with a decoupling capacitance. The proposed VCO applies a decoupling capacitance between the power supply and degeneration resistance in the VCO to reduce the unbalanced characteristics of the current‐reused VCO. Adopting the decoupling capacitance can balance and enlarge the output amplitude while enhancing the phase noise. The simulated amplitude unbalance ratio is 5%, compared with 11% of the amplitude unbalance ratio of a conventional current‐reused VCO. In addition, the proposed design enlarges the amplitude by 25%, compared with the amplitude of a conventional current‐reused VCO without increasing power consumption. The proposed design has been fabricated in a TSMC 0.18‐μm CMOS process. The power consumption is 1.6 mW from a 1.8 V supply. The fabricated VCO operates from 2.1 to 2.7 GHz with a 22.7% tuning range. The measured phase noise is −121 dBc/Hz at 1 MHz offset at 2.2 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1626–1629, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26904
Design of compact dual‐meander antenna for WLAN operation
Authors: Seo Yongseok , Jung Jinwoo , Lee Hyeonjin , Lim Yeongseog 
Published: April 2012

AbstractA novel and simple design of a coplanar waveguide‐fed dual‐band antenna based on a compact dual‐meander antenna is investigated for wireless local area network (WLAN) applications. The impedance bandwidths achieved can reach about 0.57 GHz (2.13–2.70 GHz) 23.7% at the center frequency of 2.40 and 0.55 GHz (5.20–5.75 GHz) 10.4% at the center frequency of 5.30 GHz. These characteristics meet the required bandwidth specifications of IEEE 802.11a/b/g. The peak antenna gains for the operating frequencies across dual WLAN bands are measured to be 6.30 and 5.16 dBi, respectively. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1595–1599, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26905
A compact design of tunable band‐notched ultrawideband antenna
Authors: Elfergani I. T. E. , Abd‐Alhameed R. A , See C. H. , Jones S. M. R. , Excell P. S. 
Published: April 2012

AbstractIn this letter, a compact ultrawideband planar inverted F‐L antenna with a tunable band‐notched response is presented. Tuning of the rejected frequency bands is realized by loading a variable capacitor on an embedded slot of the proposed antenna structure. The antenna exhibits a wide impedance bandwidth from 3.1 to 10.6 GHz with a good impedance matching (voltage standing wave ratio ≤ 2) and tunable broad range of band‐reject frequency (centre frequency from 3.2 to 6 GHz). To validate the theoretical model and design concept, the antenna prototype was fabricated and measured. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1642–1644, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26907
Modeling and analysis of a conventional and localized electromagnetic bandgap structures for suppression of simultaneous switching noise
Authors: Kim Sang‐Gyu , Kim Hyun , Kang Hee‐do , Yook Jong‐Gwan 
Published: April 2012

AbstractThe transmission line method (TLM) is applied for the analysis of a conventional electromagnetic bandgap (EBG) and enhanced moat structures with an arbitrary shaped power/ground plane. Fast and accurate modeling by TLM reveals computationally efficient results as compared to 3D full‐wave electromagnetic analysis. Moreover, it is shown that the suppression bandwidth of an EBG structure can be easily analyzed with stepped impedance filter approach, and the calculated bandwidth is identical to the measured bandwidth. In general, the conventional EBG structure provides highly efficient suppression of simultaneous switching noise (SSN) over the broadband range; however, it is difficult to apply this concept to real PCB design for high‐speed digital circuits due to degeneration of the signal integrity (SI) performance. In this work, an enhanced localized EBG structure is suggested to enlarge the suppression bandwidth by modifying the EBG pattern without causing any SI problem. The number of bridges for each pattern is minimized, and a meander‐shaped bridge is used to increase the inductance of the bridge. As a result, good suppression of SSN is achieved from 0.8 to 6.5 GHz with a −25 dB suppression level. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1571–1577, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26910
Electrically thin free‐standing phase and amplitude shifting surface for beam shaping applications
Authors: Gagnon N. , Petosa A. , McNamara D. A. 
Published: April 2012

AbstractA free‐standing phase and amplitude shifting surface (PASS) composed of four conductive layers separated by electrically thin dielectric sheets is presented in this article.This surface can be used for applications in which one must control both the phase and amplitude of electromagnetic waves propagating through it at every location over the aperture. The PASS provides a simple and efficient technique for manipulating the radiation pattern from a feed antenna for beam shaping applications. As a proof of concept, the technique is applied in the design of a flat‐topped shaped beam antenna. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1566–1571, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26911
Microwave absorption characteristics of substituted Ba0.5Sr0.5MxFe(12−2x)O19 (M = Co2+Zr4+ AND Co2+Ti4+) sintered ferrite at X‐band
Authors: Singh Charanjeet , Bindra Narang S. , Koledintseva M.Y. 
Published: April 2012

AbstractThe microwave reflection loss (RL) of four series of synthesized ferrites, Ba0.5Sr0.5CoxZrxFe(12 − 2x)O19 and Ba0.5Sr0.5CoxTixFe(12 − 2x)O19, have been measured using network analyzer in the frequency range from 8.2 to 12.4 GHz. The comprehensive analysis of RL is carried out as a function of substitution, frequency, and thickness. The various models contributing to large RL are described. The composition accompanying maximum microwave absorption is suggested. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1661–1665, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26912
LS band antenna backed by surface wave structure
Authors: Reddy G. Shrikanth , Alex Zachariah C. 
Published: April 2012

AbstractIn this article, a LS band (1.5–2.3 GHz) antenna is presented.Here, the antenna is backed by partial ground and periodic surface wave structure. Both the simulated and experimental result shows that the proposed antenna acquires a bandwidth of 38.8%, that is, 1.5–2.2 GHz and an end fire radiation pattern with a beam width of 108° and maximum gain of 6.5 dbi at 2.1 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1556–1559, 2012, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26914
Design and implementation of A 24‐/60‐GHz dual‐band monopole meander‐line planar CMOS antenna
Authors: Lin Chih‐Ying , Lin Yo‐Sheng , Lu Hsin‐Chia , Chang Yi‐Long 
Published: April 2012

AbstractThis article describes the design and implementation of a monolithic 24/60‐GHz dual‐band millimeter‐ wave planar CMOS antenna.A finite element method‐based 3D full‐wave electromagnetic solver, high‐frequency structure simulator, is used to simulate and optimize the performance of the antenna. The feeding network adopts the coplanar waveguide (CPW) structure, so the on‐chip antenna can be flip‐chip‐bonded to a CPW RO4003 conversion board for complete radiation‐pattern measurement. The main structure uses meander‐line to save chip area. Dual‐band operation is achieved by providing two major current paths for radiation. The measured input voltage standing wave ratio of the on‐chip dual‐band antenna is smaller than 2 for frequencies 10–25.7 and 58.4–66.6 GHz. The measured maximum power gain is −7 dB at 60 GHz, one of the highest power gains ever reported for a CMOS antenna at 60 GHz. The chip area is only 1 × 0.75 mm2, i.e., 0.75 mm2, excluding the periphery conductor and the dummy metals for metal density requirement. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1731–1737, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26916
Characteristics of circular patch antenna with and without air gaps
Authors: Biswas M. , Banik S. 
Published: April 2012

AbstractThe characteristics of circular patch antenna (CPA) with and without air gaps in between substrate and ground plane are thoroughly investigated. We present a set of closed‐form expressions based on cavity model analysis to predict accurately the characteristics of CPA with and without air gaps. The proposed model is valid for both coaxial‐fed and microstrip line‐fed CPA operated in dominant and higher order modes. The computed values for wide range of antenna parameters, feed locations, and air gaps are compared with different experimental and theoretical values available in open literature. The present model is fast, simple, and closer to the experiments compared with the other models. We have also used a simulator to validate the present model. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1692–1699, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26917