bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bandwidth‐enhanced internal PIFA with a coupling feed for quad‐band operation in the mobile phone
Authors: Wong Kin‐Lu , Huang Chih‐Hong 
Published: January 2008

AbstractA novel bandwidth‐enhanced internal planar inverted‐F antenna (PIFA) for quad‐band operation in the mobile phone is presented. The proposed PIFA is capacitively excited using a coupling feed, which leads to a dual‐resonance excitation in the antenna's lower band at about 900 MHz and a wide‐band resonant mode excitation at about 1800 MHz. This makes the operating bandwidths of both the antenna's lower and upper bands larger than 20% (3:1 VSWR), thus easily covering GSM850/900 and DCS/PCS operation. In addition, with quad‐band operation obtained, the proposed PIFA occupies a small volume of 5 × 6 × 60 mm3 or 1.8 cm3 only. Details of the proposed PIFA are described, and results of fabricated prototypes are presented and discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 683–687, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23175
Parallel‐coupled bandpass filter with improved rejection slope using δ‐offset length
Authors: Soh Johnson , Teck Chew Siou , Ooi Ban‐Leong 
Published: January 2008

AbstractIn this article, a novel method to improve the rejection of edge coupled filters by perturbing the coupled line sections by a length, δ, is introduced. This gives controls over the null position between the fundamental and 1st harmonic of the filter which results in a steeper rejection slope by shifting this null closer to the centre frequency. A 4th order 5 GHz band‐pass filter is designed and tested. Measured results show an improvement of about 9 dB at 6 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 680–683, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23176
Synthetic asymptote formulas of asymmetric edge‐coupled striplines
Authors: Tang Wanchun , Yu Zhengyong , Chen Xuemei 
Published: January 2008

AbstractSimple CAD formulas are obtained in this article for the even–odd mode capacitances and characteristic impedances of asymmetric edge‐coupled stripline via synthetic asymptote. Compared with the numerical results, the average error is less than 2%. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 706–708, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23178
A one‐piece flat‐plate dipole antenna for dual‐band WLAN operation
Authors: Su Saou‐Wen , Chou Jui‐Hung , Liu Yung‐Tao 
Published: January 2008

AbstractA simple, one‐piece, flat‐plate dipole antenna suitable for dual‐band WLAN applications is presented. The antenna is structured to be of an L‐shape to fit in corners of possible wireless electronics devices. The two radiating arms of the dipole antenna are further short‐circuited through a narrow shorting strip at the corners, making it possible for the antenna to be manufactured by stamping a single, flat metal plate only one time. That is, the proposed antenna in the mass‐production phase can be at lower cost. In addition, by cutting an L‐shaped slit at proper location in each radiating arm, a dual‐band operation can easily be obtained. The design prototype of the antenna in the 2.4/5.2 GHz bands is discussed in detail in the article. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 678–680, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23179
Integrated planar spiral inductors with CoFe and NiFe ferromagnetic layer
Authors: Kim GyoungBum , Cha Seung‐Yong , Hyun Eun‐Kyung , Jung YoungChai , Choi YoonSuk , Rieh Jae‐Sung , Lee Seong‐Rae , Hwang SungWoo 
Published: January 2008

AbstractInductance increase up to 28% was obtained for on‐chip spiral inductors by employing DC‐sputtered CoFe and NiFe ferromagnetic (FM) layer on top of the spirals. It was also observed that slit‐patterned FM layers exhibited better quality factors than blanket FM layers, leading to values comparable to that of the inductors without FM layer. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 676–678, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23180
Fresnel zone plate antenna with hexagonal‐cut zones
Authors: Stout‐Grandy S. M. , Petosa A. , Minin I. V. , Minin O. V. , Wight J. S. 
Published: January 2008

AbstractA novel Fresnel zone plate antenna (FZPA) with hexagonal‐cut zones is presented. This new structure was simulated at 30 GHz using a finite‐difference time‐domain software to study its gain and sidelobe levels in relation to the standard circular FZPA and the hexagonal FZPA. Several prototypes were built and tested to verify the simulations. It was found that the FZPA with rotated alternating hexagonal‐cut zones provides the ability to control the shape and location of the sidelobes while still maintaining the benefits of the hexagonal shape in terms of array packing. Also, this new structure has an improved sidelobe level over the standard version. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 672–676, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23183
Passively Q‐switched erbium‐doped fiber laser based on nonlinear polarization rotation
Authors: Zhang Zuxing , Sang Minghuang , Ye Zhiqing , Nie Yiyou 
Published: January 2008

AbstractWe have experimentally demonstrated an all‐fiber passively Q‐switched Erbium‐doped fiber (EDF) ring laser based on nonlinear polarization rotation. By incorporating a long section of single‐mode fiber and a polarization‐dependent isolator into the EDF ring laser, the intensity‐dependent transmission due to the effect of nonlinear polarization rotation can be implemented, which can act as an artificial saturable absorber for Q‐switching. Such a passively Q‐switched ring laser has the simple and all‐fiber configuration. In addition, passively harmonic mode‐locking and chaotic pulses are also generated from the EDF ring laser. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 694–696, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23185
On the interpolation of the frequency variations of the MoM‐PO impedance matrix over a wide bandwidth
Authors: Karwowski Andrzej , Noga Artur 
Published: January 2008

AbstractA possibility of generating wide‐band data from MoM‐PO hybrid formulation by frequency interpolation of the impedance matrix is examined with particular attention given to a simple interpolation scheme originally proposed for the MoM impedance matrix, employing three uniformly spaced frequency nodes forming a sliding window over the desired band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 738–741, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23190
Elliptically shaped ultra‐wideband patch antenna with band‐notch features
Authors: Yuan Tao , Qiu Cheng‐Wei , Li Le‐Wei , Seng Leong Mook , Zhang Qun 
Published: January 2008

AbstractA series of ultra‐wideband antenna using an elliptically curved patch is investigated. The band‐notch feature is realized by cutting off a bended slot, which can be tuned. S11 is controllable by the length of the tunable slot. The antenna exhibits good omnidirectional performance across the operation bandwidth. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 736–738, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23191
Perfectly matched layers backed with the first order impedance boundary condition for the time‐domain finite‐element solution of waveguide problems
Authors: Du L. , Chen R.S. , Ye Z.B. 
Published: January 2008

AbstractThe first order impedance boundary condition (the first order ABC) is combined with the perfectly matched layer (PML) for the time‐domain finite‐element (TDFE) simulation of waveguide problems. The formulation is validated by the numerical simulations of waveguide problems. Numerical results clearly show that the PML backed with the first order impedance boundary condition performs better than the PML backed with the perfect electrically conducting (PEC) wall when used to absorb the propagating wave. In the same situation, PML terminated with the first order impedance boundary condition can reduce about 10 dB of the reflection errors compared with that obtained from the PML terminated by PEC wall. Therefore, the proposed boundary conduction can reduce the number of the unknowns and provide an effective mesh truncation for the TDFEM solution of waveguide problems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 838–843, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23192
An LC‐tank injection locked frequency divider with record locking range percentage
Authors: Jang Sheng‐Lyang , Chen Fei‐Hung , Lee Chien‐Feng , Juang M.‐H. 
Published: January 2008

AbstractThis article presents a wide locking range injection locked frequency divider (ILFD) implemented using a standard 0.18‐μm CMOS process. The ILFD consists of a double‐cross‐coupled VCO and an injection MOS for coupling injection signal to the resonator. At the supply voltage of 1.8 V, the free‐running ILFD is tunable from 4.46 to 4.91 GHz. At the injection power of 0 dBm, the locking range of ILFD is tunable from 6.2 to 11 GHz. The percentage of ILFD locking range is 55.8%, which is the highest among similar published LC‐tank ILFDs. The phase noise of the ILFD can track with the injection source. The ILFD has been applied to form a quadrature ILFD and an on‐chip VCO has been designed to verify the function of the quadrature ILFD. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 806–809, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23193
A dual‐frequency microstrip antenna based on an unbalanced composite right/left‐handed transmission line
Authors: Jie Xiaoyong , Luo Chunrong , Zhao Xiaopeng 
Published: January 2008

AbstractAn unbalanced composite right/left‐handed transmission line structure is used for the design of a novel dual‐frequency microstrip antenna operating at X band. It is shown that the antenna has a very similar performance in both the operating modes to that of a conventional microstrip patch antenna (MPA) with respect to radiating characteristics. Moreover, the measured −10 dB bandwidth and gain for the proposed antenna are improved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 767–771, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23195
Investigations on the microwave properties of electropolymerised polyaniline thin film
Authors: Vhanakhande B. B. , Jadhav S. V. , Kulkarni D. C. , Puri Vijaya 
Published: January 2008

AbstractThis study reports the X‐and Ku‐band microwave transmittance, reflectance, conductivity, and shielding effectiveness of nano structured electropolymerised polyaniline (PANI) thin films on stainless steel. Waveguide reflectometer method has been used for the microwave studies. Microwave conductivity varies between 0.85 and 0.18 S/cm. PANI thin films have better shielding effectiveness in Ku‐band than in X‐band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 761–766, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23196
Novel dual‐mode dual‐band bandpass filter using nested microstrip meander‐loop resonators
Authors: Dai Xi‐Wang , Liang Chang‐Hong , Chen Zhi‐Xi 
Published: January 2008

AbstractA novel dual‐mode dual‐band bandpass filter using nested meander‐loop resonators is proposed in this article. The new filter structure is small and convenient to change the higher passband frequency. Several finite attenuation poles in stopbands are realized to improve the selectivity of the proposed bandpass filter. The filter is evaluated by experiment and simulation with very good agreement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 836–838, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23199
Solution of electromagnetic scattering problems by transformation into high order impedance boundary condition
Authors: Tezel Necmi Serkan 
Published: January 2008

AbstractIn this study, electromagnetic scattering from inhomogeneous impedance cylinder of arbitrary shape have been solved by means of transformation of problem into equivalent problem, that is scattering from circle represented by high order inhomogeneous impedance boundary condition (IBC). High order impedance functions are determined by using shape of object and its surface impedance. Then, equivalent problem is solved by means of series expansion method. This transformation makes the problem simple formulation, which can be solved computational effectively. Results and computational times obtained by transform method and those obtained by Method of Moment (MoM) technique are compared. Good agreements are observed in results. It is also observed that transform method needs less computational time than MoM method. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 832–836, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23200
Ultra wideband planar antenna with spurline for subband rejection
Authors: Abbosh A. M. 
Published: January 2008

AbstractThe design of a compact ultra wideband planar antenna with subband rejection capability is presented. A spurline is incorporated in the microstrip feeder of the antenna to act as a bandstop filter, hence enabling the rejection of any undesired band within the passband of the antenna. Results of a parametric investigation are presented to show effect of the spurline parameters on width of the rejected subband. The investigation shows that increasing the slot and spurline widths increases width of the rejected subband. Three samples of the proposed antenna were designed and manufactured. One of the developed antennas does not contain spurline, whereas the other two contain spurlines with different dimensions. The designed antennas feature a compact size of 25 mm × 25 mm. Results of the simulation and measurement show that the designed antennas have a bandwidth from 3 GHz to more than 11 GHz. The results also show that the use of the spurlines in the microstrip feeder of the antennas efficiently rejects any undesired subband, such as the 4.9–5.9 GHz band assigned for IEEE802.11a and HIPERLAN/2. The gain of the antennas with spurline is about 2.5 dB at the passband, while it is less than −15 dB at the rejected subband. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 725–728, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23205
LTCC‐based compact UWB antenna and its integration study
Authors: Sun Mei , Zhang Y. P. 
Published: January 2008

AbstractA compact ultra‐wideband (UWB) antenna with size of 17 × 10 × 1 mm3 in low‐temperature co‐fired ceramic (LTCC) technology is designed, fabricated, and tested. It achieves impedance bandwidth of 6.7 GHz from 3.5 to 10.2 GHz. The measured antenna radiation patterns at 6.85 GHz are also presented. The antenna is further studied for a single‐package solution of UWB radio transceivers. The integration is analyzed with an emphasis on the connection of the antenna to the transceiver die. The final integrated UWB antenna has size of 20 × 10 × 1.2 mm3 and achieves impedance bandwidth of 6.7 GHz from 5.05 to 11.75 GHz with available radiation patterns. It also achieves the radiation efficiency of >96% and the gain of 2.5 to 4.3 dBi over the simulated UWB frequency range. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 789–793, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23209
Modified principle of distributed ferroelectric phase shifter considering the influence of interconnecting lines
Authors: Yu An , Yang Chuanren , Chen Hongwei , Zhang Jihua 
Published: January 2008

AbstractThe deviation between theoretic values and real data of distributed ferroelectric phase shifter is investigated by simulating an ideal model and analyzing an equivalent circuit. The deviation is shown to come from the parasitic inductance of interconnecting lines between loaded capacitors and center strip of CPW, which reduces the Bragg frequency, increases the insertion loss and phase shift. By introducing an effective capacitance to consider the effect of interconnecting lines, a modified principle is presented, which forecasts performances better. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 748–751, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23212
Impact of multiple tissue layers on an implantable LC sensor
Authors: Yvanoff Marie , Venkataraman Jayanti , Fuller Lynn 
Published: January 2008

AbstractThe impact of multiple tissue layers in a biotelemetry link consisting of a single loop antenna and an implantable LC sensor is investigated through simulation and measurements. The shift in resonant frequency due to the dispersive media encapsulating the sensor is analyzed. It is seen that the resonant frequency is strongly affected by the properties of the first layer, whereas additional layers prove to have little to no effect. Further, the capacitance values as well as the type of capacitor play a dominant role on the shift in the resonant frequency. It is demonstrated that smaller capacitance values would be required for determining the properties of the tissue region in which the sensor is embedded. The complexity of the multiple tissue layers is shown to be important in determining specific absorption rate (SAR) levels. An experimental validation has been done by immersing a LC sensor in single and multiple dispersive regions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 783–787, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23216
Single and triple output coherence‐free microwave photonic filter using a 3 × 3 collinear coupler in a Sagnac fiber loop
Authors: Ning G. , Shum P. , Zhou J. 
Published: January 2008

AbstractNew structures that can realize single and triple output coherence‐free microwave photonic filter are presented. They are based on a Sagnac loop interferometer containing a single drive intensity modulator and a 3 × 3 collinear coupler, and no non‐reciprocal bias unit is required. Notch responses are obtained by modulating the clockwise and counterclockwise propagating waves inside the Sagnac loop at different times. Theoretical analysis is obtained for both DFB laser source and broad‐band source. Measured results verify the theoretical expressions and demonstrate robust notch filter responses. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 744–747, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23218
A novel crossed slotted patch dual‐mode bandpass filter with two transmission zeros
Authors: Wu Sean , Weng Min‐Hang , Jhong Shih‐Bin , Lee Maw‐Shung 
Published: January 2008

AbstractThis article presents a miniaturized dual‐mode bandpass filter (BPF) with two transmission zeros and low insertion‐loss using crossed slotted patch resonator. The BPF is mainly formed by a λ/2 patch resonator which is a pair of crossed slots with unequal widths is embedded in the center. By tuning the perturbation element, which resulted from the unequal slot widths along the diagonal, two resonant modes are excited and a pair of transmission zeros are generated to improve the selectivity of the BPF performance. The proposed filter at center frequency (f0) of 1.55 GHz has very good measured characteristics including the bandwidth of 1.49–1.62 GHz (3‐dB fractional bandwidth of 8.4%), low insertion loss of 1.74 ± 0.35 dB. The measured filter performance is in good agreement with the simulated response. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 741–744, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23219
Printed and double‐sided dipole array antennas with a parallel reflector
Authors: Huang Jhin‐Fang , Liang Jia‐Wei 
Published: January 2008

AbstractThis article describes the novel design of printed and doubled‐sided dipole array antennas with parallel reflector in the application of 2.4 GHz ISM band operated in WiFi access point. The printed dipole array antenna consists of one dipole array arranged back to back and can be easily formed by printing on both sides of a dielectric substrate and is suitable for integration with monolithic microwave integrated circuit (MMIC) module. Based on the matching theory, a 50 Ω microstrip feed line with open stub matched circuits is determined to possess high performance. The all extremely wideband or high gain dipole antenna array for value of standing wave ratio (VSWR) ≤ 1.5 has been successfully implemented and achieved. Simulator IE3D is used to verify our analysis. Both simulated and measured data are much identical. The designed 8‐element printed dipole array antenna without and with a reflector metallic ground plane achieves a gain of 8.5–9.3 dB with a 200 MHz bandwidth and a gain of 11.4–12.3 dB with a 80 MHz bandwidth, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 595–600, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23223
A comparison between two solution techniques to solve the equations of glacially induced deformation of an elastic Earth
Authors: Bängtsson Erik , Lund Björn 
Published: January 2008

AbstractIn this paper we compare two modeling frameworks within which we compute the Earth's elastic response to an external load. The main difference between the two frameworks lies in their capability to solve the partial differential equations (PDE) for a pre‐stressed elastic body, and especially how the term describing the pre‐stress advection is represented. Furthermore, the two frameworks differ in their applicability in the incompressible limit, the choice of the finite elements (FEs) used for the discretization, and the solution strategy for the arising algebraic problem.The two frameworks are denoted as Framework I and II. Framework I is confined to the features of a commercial FE package (ABAQUS), whereas Framework II is based on a code developed by the authors.The efficiency and accuracy of the two frameworks are compared via theoretical analysis and numerical experiments for two model problems in 2D and 3D. We find that the preconditioned iterative solution method used in Framework II is more efficient than the direct solver used in Framework I. Furthermore, we find that the solutions obtained from the two frameworks differ significantly for compressible solids. This is due to how the pre‐stress advection term is handled. Copyright © 2008 John Wiley & Sons, Ltd.