bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compact planar ultrawideband wide‐slot antenna with an assembled band‐notched structure
Authors: Zeng Wenbo , Zhao Jia , Wu Qiqi 
Published: April 2012

AbstractA simple and compact wide‐slot antenna and its extended band‐notched design are presented.The proposed antenna is etched on a piece of FR4 printed circuit board with an overall size of 30 × 28 × 0.8 mm3. It consists of a polygonal wide slot, a coplanar waveguide feeding line, and a circular metal ring. The antenna prototype achieves good impedance matching, a constant gain, and stable radiation patterns over an operating bandwidth of 3.1–10.6 GHz. Furthermore, after the addition of an assembled band‐notch structure, which is formed by a pair of inverted L‐shaped slits embedded in the ground plane and a T‐shaped stub inside the metal ring, the proposed antenna exhibits band‐notched characteristics and achieves a much sharper notch band at 5–6 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1654–1659, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26864
A low phase noise oscillator using a new high‐q resonator with μ‐near zero metamaterial
Authors: Yoon Ki‐Cheol , Lee Hyunwook , Lee Dong‐Ki , Kim Ki‐Byoung , Lee Jong‐Chul 
Published: April 2012

AbstractThis article proposed a new high‐QLresonator with a combination of a double spiral resonator and single split ring resonator with μ‐ near zero metamaterial.It is applied to the design of an X‐band oscillator. A very low phase noise for the oscillator can be obtained due to its sharp band‐ rejection characteristic of the new resonator. The oscillator is designed to operate at 9.2 GHz using the new resonator. Experimental results show the output power is 14.13 dBm, the second harmonic suppression is −46.33 dBc, and the phase noise is −104.54 dBc/Hz at 100‐kHz offset. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1577–1582, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26867
Integration of monopole slot and monopole strip for internal WWAN handset antenna
Authors: Wong Kin‐Lu , Lin Po‐Wei 
Published: April 2012

AbstractA novel internal handset antenna formed by a monopole slot and a monopole strip for the wireless wide area network (WWAN) operation in the 824–960 and 1710–2170 MHz bands is presented. The monopole strip is disposed in the monopole slot, and both are embedded in the system ground plane of the handset with a small board space of 9 × 40 mm2 at about the bottom edge of the circuit board. The monopole strip serves as a feed for the monopole slot and also functions as an efficient radiator. In the proposed design, the monopole slot generates a quarter‐wavelength slot mode in the antenna's lower band, while the monopole strip contributes its quarter‐wavelength mode in the antenna's upper band. By including a vertical strip that can be enclosed inside the handset casing or be a part of the bezel surrounding, the periphery of the handset casing and connected to the bottom edge of the system ground plane, the impedance matching of the excited slot mode can be greatly improved. In this case, the proposed antenna can provide two wide operating bands with good impedance matching to cover the pentaband WWAN operation. Detailed operating principle of the integrated monopole slot and monopole strip for the internal WWAN handset antenna is described. The proposed antenna is also fabricated and obtained results are presented and discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1718–1723, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26870
High gain Fermi antenna array for radar‐aided radiotherapy system
Authors: Salmani Zeeshan , Gu Changzhan , Li Changzhi , Zhang Hualiang 
Published: April 2012

AbstractThis article presents the design of Fermi antenna array with improved gain for radar respiration measurement. A six‐element Fermi antenna array working at 5.8 GHz is optimally designed and integrated with the respiration radar system. Specifically, to easily feed the antenna array as well as reduce the total size of the array system, a feeding network based on 0‐degree phase shifters is used along with suitable impedance transformers. The whole system is proposed to function as a radar sensor for respiration rate measurement, which is known as a promising noncontact and noninvasive approach for lung cancer radiotherapy. The measurement results verify the improved performance of the proposed system for radar respiration measurement in motion‐adaptive lung cancer radiotherapy. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1649–1654, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26871
Dual‐grid multiresolution technique for electrically large BoR‐FDTD simulation
Authors: Dahlan Samsul , Rolland Anthony , Sauleau Ronan 
Published: April 2012

AbstractThe dual‐grid (DG) technique is implemented in the body‐of‐revolution FDTD algorithm (BoR‐FDTD) for the fast analysis of large rotationally symmetric antennas.The proposed technique combines two BoR‐FDTD simulations performed successively with fine and coarse mesh schemes, respectively. First, all excitation sources are analyzed locally with a fine mesh resolution and the near‐field distributions are saved. Second, the whole problem (feeds and scatterers) is modeled using a coarser mesh where the computational domain is excited by the equivalent sources stored at the first stage. The continuity between these two simulations is guarantied by means of linear field interpolation or sampling (in space and time) and total/scattered field formulation. The relevance of the proposed technique is demonstrated through the analysis of a 60 × λ0 parabolic antenna system illuminated by an electromagnetic band gap feed. The DG technique is found to be accurate and faster than the classical BoR‐FDTD approach. Our results also show that significant savings are obtained in terms of computation time and memory. The DG‐BoR‐FDTD strategy is considered as a powerful and flexible approach to analyze the influence of the surrounding environments without having to repeat the expensive part of the simulation. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1714–1718, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26873
A novel compact dual‐frequency monopole antenna for quad‐band mobile terminal application
Authors: Kang Gaojian , Du Zhengwei 
Published: April 2012

AbstractA novel compact dual‐frequency monopole antenna with a parasitic radiating strip is presented. The antenna with a height of only 6.5 mm, printed on the upper board and side board, is vertically placed at the upper‐left corner of the main board to reduce the occupied area of the main board. A parasitic strip with meandered structure is added into the antenna, and hence, the dual‐frequency characteristic is achieved to broaden the bandwidth. The measured −10 dB impedance bandwidth is 960 MHz (1920–2880 MHz), covering the UMTS (1920–2170 MHz), WiBro (2300–2400 MHz), WLAN (2400–2483 MHz), and WiMAX (2500–2690 MHz) bands. Thus, the proposed antenna is suitable for multisystem mobile terminal applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1743–1746, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26876
Four‐tap microwave photonic filter with tunable center frequency and reconfigurable transfer function
Authors: Wang Yi , Jin Xiaofeng , Xu Kai , Ou Jianhai , Chi Hao , Zhang Xianmin , Zheng Shilie 
Published: April 2012

AbstractA four‐tap microwave photonic filter with tunable center frequency and reconfigurable transfer function is proposed.It is based on two Mach‐Zehnder interferometers (MZIs) cascaded with a variable optical coupler (OC) in between. By simultaneously adjusting the variable optical delay line incorporated in each MZI, center frequency of the filter can be tuned continuously. Reconfiguration of the filter is achieved by changing the coupling ratio of the variable OC. Experimental result demonstrates a tunable four‐tap filter with sidelobe suppression in excess of 25 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1740–1743, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26877
Fiber‐optic in‐line michelson temperature sensor
Authors: Park Jaehee , Shin Jong Duk 
Published: April 2012

AbstractThis article presents a fiber‐optic in‐line Michelson temperature sensor with the high sensitivity.The in‐line Michelson interferometer used as a fiber‐optic temperature sensor is composed of a hollow optical fiber spliced to a single‐mode standard optical fiber at one end and cleaved at the other end. As the fabrication procedure involving fusion splicing and cleaving, the fiber‐optic in‐line Michelson temperature sensor is much easier and cheaper to make. The relation between the phase shift and temperature is approximately linear and the sensor sensitivity is about 3.1 radian/°C. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1699–1701, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26879
Wide upper‐stopband microstrip bandpass filter with dual‐mode open loop stepped‐impedance resonator and source‐load coupling structure
Authors: Deng Hong‐Wei , Zhao Yong‐Jiu , Chen Wen , Liu Bing , Liu Yan‐Yun 
Published: April 2012

AbstractIn this article, a dual‐mode microstrip bandpass filter (BPF) with compact size, sharp skirt, and wide upper‐stopband performance is proposed using the short‐stub‐loaded open loop stepped‐impedance resonator and source‐load coupling structure. The advantageous features of the resonator are that the even‐mode resonant frequencies can be controlled exclusively by the short stub, and two transmission zeros are created near the passband by the short stub and the folded arms. Meanwhile, two transmission zeros generated by the source‐load coupling structure can be applied to suppress the first and second spurious harmonics. Finally, a microstrip BPF located at 2.4 GHz with a fractional bandwidth 4% is designed, fabricated, and measured. The upper stopband in experiment is extended up to 20 GHz with an insertion loss lower than −21.2 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1618–1621, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26881
Bandwidth enhancement of a printed dipole antenna for wideband applications
Authors: Fan S. T. , Yin Y.Z. , Hu W. , Li B. , Yang J. H. 
Published: April 2012

AbstractThe design of a novel printed dipole antenna with bandwidth enhancement is proposed for wideband applications. The antenna consists of an integrated balun, two rectangular radiating arms and a modified inductive coplanar stripline (CPS) impedance tuner. By adjusting the parameters of the CPS‐tuner and the balun properly, a good performance of bandwidth enhancement is achieved. The measured results indicate that the impedance bandwidth of the proposed antenna, defined by 10‐dB return loss, is about 73.9% from 2.54 to 5.52GHz. In addition, good omnidirectional radiation characteristics are also obtained over the whole operating band. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1585–1590, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26883
Single‐layer circular polarizer using metamaterial and its application in antenna
Authors: Ma Xiaoliang , Huang Cheng , Pu Mingbo , Hu Chenggang , Feng Qin , Luo Xiangang 
Published: April 2012

AbstractIn this letter, we report a new type of circular polarizer using a single‐layer metamaterial. The unit cell is composed of a metallic annular‐ring and an embedded strip. Numerical and experimental results show that the linearly polarized plane wave can be converted to circularly polarized wave with a 3‐dB axial ratio bandwidth of about 17%, which is from 13.25 to 15.7 GHz. The polarizer can also keep good circular polarization with incident off‐normal angle in the range of ±30°. Subsequently, this polarizer is applied in the linearly polarized microstrip patch antenna as superstrate, making this antenna composite radiate circularly polarized wave. In addition, the antenna gain is enhanced by about 3 dB in comparison with conventional patch antenna without polarizer. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1770–1774, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26884
Microstrip lowpass filter based on split ring and complementary split ring resonators
Authors: Yang Yang , Zhu Xi , Karmakar Nemai C. 
Published: April 2012

AbstractA novel split ring and complementary split ring resonator is proposed in this letter.The proposed resonator can generate two notches without increasing the physical size. A microstrip lowpass filter (LPF) is designed based on the proposed resonator. The cutoff frequency of the designed LPF is 3.7 GHz and the stopband with an attenuation level lower than −20 dB is obtained from 3.9 to 7.5 GHz. The selectivity is calculated to be 85 dB/GHz. The physical size of the LPF with transmission lines is 29 × 6 mm2. A good agreement between simulated and measured results is achieved. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1723–1726, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26887
H‐shaped SIR bandpass filter with dual and tri‐band
Authors: Xiao Jian‐Kang , Zhu Wen‐Jun 
Published: April 2012

AbstractCompact dual‐band bandpass filter which meets IEEE 802.11 application requirements by using new H‐shaped tri‐section stepped‐impedance resonator is proposed, and a tri‐band bandpass filter which achieves insertion loss of 0.41, 0.66, and 1.65 dB at 2.5, 3.49, and 5.6 GHz, respectively, is also designed with two‐path coupling. The new designs are demonstrated by experiment. The new filters have advantages of compact structures, low passband insertion losses, good frequency selectivity, and miniature circuit sizes. All these have prospect to be applied in future wireless communication systems. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1686–1688, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26888
Two‐poles compact microstrip bandpass filter with sharp transition bands using high permittivity substrate
Authors: Yang Wen‐Ruei , Huang Cheng‐Liang 
Published: April 2012

AbstractThis article describes the two‐pole microstrip band‐pass filters using miniaturized center‐stubbed open stubs and tapped‐line input/output ports. The two‐poles bandpass filters by using FR4 and high‐permittivity ceramic substrates (with respective dielectric constants of 4.5 and 31.55) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. The advantage of using high permittivity ceramic substrates is to reduce the sizes and increase the performance of microstrip bandpass filters. The responses of the filters using FR4 (εr = 4.5, tan δ = 0.015) and Nd(Zn1/2Ti1/2)O3 (εr = 31.55, tan δ= 0.00005) ceramic substrates are designed at a center frequency of 2 GHz. The compact size, low‐loss, sharp response, and performance of the filter are presented in this article. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1683–1686, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26889
Sensing of hydrostatic pressure using FBG sensor for liquid level measurement
Authors: Sengupta D. , Sai Shankar M. , Saidi Reddy P. , Sai Prasad R.L. N. , Srimannarayana K. 
Published: April 2012

AbstractPressure and temperature are two important parameters in hydrostatic pressure based liquid level sensing. In this study, we propose a liquid level sensor based on hydrostatic pressure variation sensed by fiber Bragg grating (FBG1) attached to a bourdon tube. The water column pressure sensitivity coefficient of FBG1 is 0.072 nm/m. One more FBG2 is incorporated to avoid cross sensitivity of temperature. The temperature sensitivity coefficient of the FBG1 and FBG2 are 10.5 pm/°C and 10.2 pm/°C. The packaged sensor head can be placed inside a chamber and also easily mountable external to the tank for the measurement of liquid level. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1679–1683, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26890
Large anisotropic inhomogeneous higher order hierarchical generalized hexahedral finite elements for 3‐D electromagnetic modeling of scattering and waveguide structures
Authors: Manić Ana B. , Manić Sanja B. , Ilić Milan M. , Notaroš Branislav M. 
Published: April 2012

AbstractA higher order large‐domain finite element technique for three‐dimensional modeling of electromagnetic structures involving general anisotropic inhomogeneous materials is presented.The examples demonstrate efficient and accurate simulations of scattering and waveguide structures using large (a couple of wavelengths across) anisotropic continuously inhomogeneous curved finite elements with p‐refined (high‐order) field distributions. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1644–1649, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26892
Full colorless gigabit wavelength‐division multiplexed‐passive optical network supporting simultaneous two different data transmission
Authors: Won Yong‐Yuk , Kim Hyun‐Seung , Son Yong‐Hwan , Han Sang‐Kook 
Published: April 2012

AbstractA novel wavelength‐division multiplexed‐passive optical network scheme supporting the transmission of heterogeneous data and broadcast signal is proposed in this article. Both optical carrier suppression and multiplexing of arrayed waveguide grating with 50‐GHz channel spacing are used to generate each optical carrier for the transmission of these data. A reflective semiconductor optical amplifier is also used, so that this architecture operates irrespective of wavelength. In case of downlink transmission, error‐free transmissions (bit error rate of 10−11) of 1.25‐ and 2.5‐Gb/s baseband data are achieved at the same time. Also, 64‐quadrature amplitude modulation signal of 60 Mb/s is transmitted showing the error vector magnitude of 4.7% in the presence of the transmission of 2.5‐Gb/s baseband data. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1757–1761, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26893
A 2.6–3.4 GHz low‐voltage LC‐VCO with a boosted transconductance
Authors: Lee Hui Dong , Jung Jae Ho 
Published: April 2012

AbstractA 2.6–3.4 GHz low‐voltage voltage‐controlled oscillator (VCO) with a boosted transconductance is presented. The proposed VCO operates with less current dissipation for oscillation start‐up, being enabled to supply voltage reduction. The phase noise of the proposed VCO is improved by not entering in deep triode region of MOSFETs. Implemented in a 65‐nm CMOS, the measurements results show 800 MHz of tuning range, consuming 1.56 mW at 0.6 V supply. The measured phase noise is −116 dBc/Hz at 1 MHz offset from a 3.3‐GHz carrier. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1671–1674, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26898
High‐capacity radio frequency identification‐based radio over fiber system
Authors: Udomariyasap P. , Noppanakeepong S. , Mitatha S. , Yupapin P.P. 
Published: April 2012

AbstractWe present the use of a serial ring resonator system for multichannel radio frequency generation that can be used to form the radio frequency identification (RFID) application. A system consists of a serial nonlinear microring resonator system for generating pulse and selecting signals that can be filtered by using the add/drop filter. The input pulse is a Gaussian pulse with center wavelength at 1,500 nm. By using suitable simulation microring parameters, the generation of signal with the center wavelength or frequency at 2.15 nm or 285 GHz is achieved, where the high frequency RFID with 91 channels is generated and noted. The use of THz frequency enhancement and RFID‐based wireless communication is discussed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1637–1642, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26899
Q‐factor improvement of integrated inductors using high aspect ratio ferromagnetic nanowires
Authors: Hamoir Gael , Piraux Luc , Huynen Isabelle 
Published: April 2012

AbstractWe fabricated a planar inductor onto a substrate made of high aspect ratio ferromagnetic nickel nanowires in a self‐supported alumina nanoporous membrane. We observe a simultaneous increase of the inductance value and the quality factor up to 7 GHz, thanks to the large amount of ferromagnetic material and the nanoscale of the wires limiting conducting losses. Our device shows the largest increase reported in the literature for such ferromagnetic inductors: +30% for the inductance value and +23% for the quality factor. Even more, this technology offers great advantages as an easy integration in miniaturized topologies and its tunability to a magnetic field to broaden the desired frequency range. Our analytical model predicts that the increase of quality factor can be maximized up to 35% by an optimization of the pores filling. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1633–1637, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26900
Active integrated meshed patch antennas for small satellites
Authors: Genc Alper , Turpin Timothy , Yasin Tursunjan , Baktur Reyhan 
Published: April 2012

AbstractMeshed microstrip antennas are optically see‐through when printed on transparent substrates and can potentially be directly integrated on solar cells to save surface real estate of small satellites.Integrating active components such as amplifiers with see‐through antennas further extends multifunctionality of solar panels. Two active integrated meshed patch antennas were studied at 2.48 GHz. The antennas serve as loads for class‐B power amplifiers and as radiators. As a reference, the first design was a regular meshed antenna integrated with an amplifier. In the second design, the antenna was modified to suppress its second harmonics to improve the power added efficiency (PAE) of the integrated amplifier. It was shown that the PAE of the second design is increased by the harmonics suppression. The maximum PAE was measured to be 47.2% for the harmonics suppressing meshed antenna, and the output power is 15.8 dBm at the peak PAE. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1593–1595, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26906
Analytical design of novel dual‐band cross‐coupled substrate integrated waveguide filter
Authors: Chen J. , Chen J.‐Z. , Fu S. , Liang C.‐H. 
Published: April 2012

AbstractA dual‐band substrate integrated waveguide (SIW) filter is presented in this article. The dual‐band cross‐coupled design procedure is based on the frequency transformation from the normalized frequency domain to the actual frequency domain, which can calculate the coupling coefficients and the external quality factors analytically. The cross‐coupled SIW filter has the flexibility to achieve different kinds of filtering characteristics with the same coupling structure. To validate the method, a practical SIW dual‐band filter operating at 5.85–5.95 GHz and 6.05–6.15 GHz is designed and fabricated. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1609–1612, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26908