bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cladding mode coupling suppression in hole‐assisted fiber BRAGG gratings
Authors: Han Young‐Geun , Lee Young Jun , Kim Gil Hwan , Cho Hung Su , Lee Ju Han , Lee Sang Bae 
Published: November 2006

AbstractWe experimentally investigate the cladding mode coupling loss of fiber Bragg gratings written in hole‐assisted fibers. The cladding mode coupling loss is remarkably suppressed due to air holes inside of the silica cladding. The reduction of cladding mode coupling loss of less than ∼0.33 dB is obtained. The wavelengths spacing between the main peak due to the core mode coupling and the first side peak due to the first order cladding mode coupling is changed by the increase of the air holes size since the effective index of cladding mode is reduced by the air hole size within the fiber. The variation of the wavelength spacing is ranged from 2.0 to 2.28 nm. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 74–74, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22050
A coplanar waveguide‐fed folded‐slot monopole antenna for 5.8 GHz radio frequency identification application
Authors: Liu Wen‐Chung 
Published: November 2006

AbstractDesign of a simple coplanar waveguide (CPW)‐fed patch antenna for radio frequency identification (RFID) application is presented. The radiation mechanism of such an antenna has been investigated, based on a moment‐method numerical analysis and experimental measurement. The antenna with a symmetrical folded slot to become a U‐shaped monopole can excite 5.8 GHz resonance mode with impedance bandwidth of 490 MHz, average antenna gain of ≥4.1 dBi, and monopole‐like radiation patterns but has a compact antenna size. These properties make the antenna suitable for use in RFID tags. In addition, an equivalent circuit model for such kind of antenna is also presented to account for its radiation characteristics. Good agreement between the simulated and modelled results has been obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 71–74, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22051
Millimeter wave bandpass filter using three‐line microstrip structures
Authors: Zhang Zan , Gu Jian‐Zhong , Wang Chuang , Sun Xiao‐Wei 
Published: November 2006

AbstractThis paper presents a novel Ka‐band millimeter bandpass filter using three‐line microstrip structures. A network analysis of a three‐line unit is described, and the scattering parameters of the unit cell are derived. A demonstration three‐line bandpass filter and a traditional two‐line one, centered at 35 GHz, are designed, fabricated, and measured. The simulation and measured results are with good agreements. When compared with the conventional parallel coupled line microstrip structures, the new structure bandpass filter owns its practical advantages; it has improved stop band rejections, low insertion loss in pass band, reduced area of circuit layout, and released line spacing limitation for the first and last coupling units of filters. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 40–42, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22053
Short helical antenna with extremely small pitch angle
Authors: Wu Ze‐Hai , Yung Edward K. N. 
Published: November 2006

AbstractA 2‐turn helical antenna with small pitch angle between 0.6° and 3° has been studied as a radiation element of circular polarization waves in this article. The antenna with pitch angle 2° exhibits a 3‐dB axial ratio bandwidth of 9.8%, and the optimal axial ratio of 0.1 dB. When the pitch angle decreases to 0.6°, the 3‐dB axial ratio bandwidth and the best axial ratio are 5% and 0.15 dB, respectively. Variation of on‐axis axial ratio as a function of the straight wire height h has been computed, and the current along the helix is also given. Experimental verification of the antenna performance is presented. The antenna with low profile and high polarization purity characteristics is suitable for application of array antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 17–19, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22054
Coplanar to microstrip transitions for on‐wafer measurements
Authors: Wang Yi , Lancaster Michael J. 
Published: November 2006

AbstractTwo types of via‐free coplanar line to microstrip transitions are designed and tested for on‐wafer measurements. The transitions are designed to fit coplanar ground‐signal‐ground probes. They are taper transitions with capacitive ground patches and radial stub transitions. Both structures are easy implemented and exhibit wideband transmission. The performance of the optimized taper transition is among the best demonstrated in terms of a return loss of less than −20 dB from 5 to 15.5 GHz; this is even superior to the radial stub designs. Design information is given, which is based on full‐wave simulations for the taper transition, and analytical formulations for the radial stub. The increasing bandwidth with increased angle of the radial stub is observed. The transition structures and design guidelines addressed can be used for on‐wafer measurements of a wide range of microstrip circuits. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 100–103, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22056
Circuit model and near‐field behavior of a novel patch antenna for WWLAN applications
Authors: Caratelli Diego , Cicchetti Renato , Bit‐Babik Giorgi , Faraone Antonio 
Published: November 2006

AbstractThe circuit model and the near‐field behavior of a novel wide‐band E‐shaped microstrip patch antenna suitable for wireless communication devices are presented. A suitable locally conformal FDTD numerical procedure is employed to analyze the electromagnetic field excited by the radiator, and to derive a frequency‐independent antenna equivalent circuit. Numerical results concerning the antenna parameters are in good agreement with experimental measurements. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 97–100, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22057
Multiband internal antenna with independently adjusted resonance frequencies
Authors: Kim Jeongpyo , Seong Wonmo , Choi Jaehoon 
Published: November 2006

AbstractA multiband internal antenna capable of independently adjusting resonance frequencies is presented. The designed antenna consists of two radiators and has three resonance frequencies including the cellular, Korean personal communication system (K‐PCS), and satellite digital multimedia broadcasting (S‐DMB) band. The first and third resonance frequencies are fixed by the Radiator 1 of the antenna and the second is controlled by the Radiator 2. Three resonance frequencies of the designed antenna can be independently adjusted by controlling the length of individual radiator. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 65–68, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22059
A miniaturized phased array aperture antenna based on bulk ferroelectric material
Authors: Peng Liang , Ran Lixin , Zou Yingyin K. , Kong J. A. 
Published: November 2006

AbstractIn this article, we proposed a novel miniaturized phased array aperture antenna using a voltage‐controllable ferroelectric material with high dielectric constant. This antenna system combines the phase shifters and the radiating elements in a single structure, that could significantly simplify the complexity and the cost of the conventional phased array antenna systems. Simulation results on such structure are given, which agrees well with the theoretical analysis. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 37–40, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22060
Minimized closed‐loop high‐selectivity dual‐band filters using trisection stepped‐impedance resonators
Authors: Huang Tsung‐Hui , Chen Han‐Jan , Chang Chin‐Sheng , Chen Lih‐Shan , Horng Jui‐Hong , Wang Yeong‐Her , Houng Mau‐Phon 
Published: November 2006

AbstractIn this letter, a minimized closed‐loop dual‐band filters using trisection stepped‐impedance resonators (SIR) structure is presented. The closed‐loop trisection SIR with dual‐band frequency response are designed, and to establish appropriate couplings in the structure. Moreover, the proposed filter also provides the size reduction of the maximum 98% against the other dual‐band filter. The total size of the filter is less than 14 mm × 14 mm based on RO3003 substrate. In addition, the proposed filter can be implemented by using a printed circuit board (PCB) technology to achieve low‐cost, easily integrated design and fabrication. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 219–221, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22062
An experimental study on electromagnetic properties of random fiber composite materials
Authors: Xu X. , Qing A. , Gan Y. B. , Feng Y. P. 
Published: November 2006

AbstractExtensive experimental study on composite slabs with fiber inclusions has been carried out. Attention is focused on the key factors affecting the effective properties of fiber composite slabs, i.e., concentration, length, and conductivity of fiber inclusions and electrical contact between fibers. Two kinds of fibers with different conductivity, namely, Cu and C, are considered. Samples with fiber inclusions of different concentration and length are fabricated. Transmission coefficients of these samples were measured. The measured results agree reasonably well with simulation results obtained by using a previously proposed method. The effect of the key factors has been identified. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 185–190, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22064
Microstrip antenna miniaturization using partial dielectric material filling
Authors: Luukkonen Olli , Ikonen Pekka , Tretyakov Sergei 
Published: November 2006

AbstractIn this paper we study microstrip antenna miniaturization using partial filling of the antenna volume with dielectric materials. An analytical expression is derived for the quality factor of an antenna loaded with a combination of two different materials. This expression can be used to optimize the filling pattern for the design that most efficiently retains the impedance bandwidth after size reduction. Qualitative design rules are given, and a miniaturization example is provided where the antenna performance is compared for different filling patterns. Results given by the analytical model are verified with numerical simulations and experiments. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 155–159, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22066
Ultrawideband planar microstrip‐fed monopole antenna
Authors: Tseng Ching‐Fang , Huang Cheng‐Liang 
Published: November 2006

AbstractThe microsrip‐fed ultrawideband (UWB) monopole antenna is studied. The design is demonstrated assuming FR4 substrate with a relative dielectric constant of 4.4 and thickness of 1.6 mm. The presented results show that the proposed antenna of 43 mm ×50 mm dimensions has a bandwidth from 2.85 GHz to more than 15 GHz. The bandwidth covered 3.1–10.6 GHz, which has approved by the Federal Communications Commission as a commercial UWB band. Satisfactory performance was obtained using FR4 substrate, allowing low cost of production. Moreover, the antenna features near omnidirectional characteristics and good radiation efficiency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 183–185, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22069
Low‐loss triangular‐patch dual‐mode bandpass filter with slotted input/output
Authors: Liu Haiwen , Cheng Zhiqun , Sun Lingling 
Published: November 2006

AbstractWithout any perturbations on the surface of the patch resonator or orthogonal feed lines, a novel microstrip dual‐mode triangular‐patch bandpass filter with slotted I/O is introduced in this letter. The degenerate modes are excited by the use of the slotted I/O. Also, the coupling characteristics of two degenerate modes are studied with respect to main design parameters. A dual‐mode filter with 0.8 dB insertion loss in the passband was designed and fabricated. Measurement verify the validity of the proposed design method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 147–149, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22072
Multiple sweep method of moments analysis of electromagnetic scattering from 3D targets on ocean‐like rough surfaces
Authors: Çolak D. , Burkholder R. J. , Newman E. H. 
Published: November 2006

AbstractThis paper presents the multiple sweep method of moments (MSMM) analysis of electromagnetic (EM) scattering from three dimensional (3D) targets on ocean‐like rough surfaces. The MSMM is a recursive method for solving the large matrix equations which arise in the method of moments (MoM) analysis of electrically large bodies. In the MSMM, the body is split into P sections and the currents on these sections are found in a sequential downrange‐uprange fashion. The first sweep includes the dominant scattering mechanisms and each subsequent sweep includes higher order mechanisms. The results obtained from this study demonstrate that the MSMM is a very reliable and efficient tool for the analysis of this class of problems. The numerical results yield insight into electromagnetic scattering mechanisms associated with a 3D target on a rough surface, and provide accurate and robust reference solutions for more approximate techniques which can handle larger geometries more efficiently. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 241–247, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22074
A novel programmable predistortion circuit for broadband InGaP/GaAs HBT power amplifier
Authors: Gao Huai , Wang Rong , Zhang Haitao , Xue Hongxi , Li G. P. 
Published: November 2006

AbstractA novel programmable MMIC predistortion circuit as an input stage of a broadband power amplifier (PA) is proposed and designed. By varying its reference voltage, one can adjust the magnitude of gain expansion and negative phase deviation to compensate the typical nonlinearities of the following stages in a PA, as well as temperature and fabrication variations. A gain expansion of 4–5 dB and a phase improvement of 5–6° are achieved in simulation. The measurement results show that P1dBis improved by 3 dB and adjacent channel power rejection ratio (ACPR) by 5 dBc at 27 dBm output power. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 141–143, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22080
A novel multiband dipole antenna with a microstrip loop feed
Authors: Liao Wen‐Jiao , Lu Yu‐Cheng , Chou Hsi‐Tseng 
Published: November 2006

AbstractA novel microstrip antenna applicable for multiband use is proposed in this work. The design was evolved from a conventional parallel stripline dipole with modifications in the dipole geometry and feeding structure. Those measures help introduce new resonant modes and increase bandwidths in the radiation spectrum. Fundamental antenna parameters including reflection coefficients, antenna gains, radiation patterns, and efficiency are measured. The results suggest that the proposed dipole provides roughly omni directional patterns at 1.8 to 2.4, 3.6, and 5.8 GHz bands with ∼0 dBi gain on the H‐plane of the dipole. Such a planar antenna is of low cost and can be used on personal portable communication devices such as the smart phones to fulfill the multiband need of integrated mobile, Bluetooth, Wi‐Fi, and WiMAX systems. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 237–241, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22081
Waveguide miniaturization with Sr(ZnTi)Fe10O19 hexaferrite metamaterial
Authors: Liu Ji‐Chyun , Liu Chin‐Yen , Hong Yaw‐Shun , Wu Ching‐Yang , Lou Der‐Chyuan 
Published: November 2006

AbstractAn X‐band rectangular waveguide partially filled with ferrite metamaterial exhibiting the transversal negative permeability is investigated in this article. Several kinds of the miniaturized waveguide loaded with the novel Sr(ZnTi)Fe10O19 ferrite in 7 GHz frequency band have been measured. The results reveal backward‐wave pass‐band located below the cutoff frequency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 201–203, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22083
Directivity enhancement of circular polarized patch antenna using ring‐shaped frequency selective surface superstrate
Authors: Lee Dong Hyun , Lee Young Ju , Yeo Junho , Mittra Raj , Park Wee Sang 
Published: November 2006

AbstractIn this letter, a ring‐shaped frequency selective surface (FSS) superstrate is designed to enhance the directivity of a circularly polarized patch antenna by reducing the sidelobe levels. Based on the unit cell simulation, several important parameters that characterize the ring‐shaped FSS superstrate are investigated, and the design procedure of the FSS superstrate is described. The FSS antenna composite is fabricated, and the maximum directivity is 18.98 dBi, while the sidelobe level is −18 dB. Furthermore, the antenna composite maintains its circular polarization characteristic quite well. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 199–201, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22084
Compact dual‐band bandpass filter with enhanced feed coupling structures
Authors: Weng Min‐Hang , Huang Chun‐Yueh , Wu Hung‐Wei , Shu Kevin , Su Yan‐Kuin 
Published: November 2006

AbstractThis letter proposes a novel compact dual‐band bandpass filter (BPF) using the meandering open‐loop resonators (MOLRs) and with enhanced feed coupling structures (EFCS). It is shown that the designed dual band BPF has a small area in comparison of previous works. The high selectivity of the designed BPF can be obtained due to the appearance of transmission zeros in two passband edges by using the EFCS in the proposed BPF. The full‐wave simulator IE3D is used to design the MOLRs and to calculate the coupling coefficients of the basic coupling structures. Good agreement with response of electromagnetic simulation and measurement is compared. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 171–173, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22085
Substrate integrated waveguide horn antenna with dielectric lens
Authors: Che Wenquan , Fu Bing , Yao Ping , Chow Y. L. 
Published: November 2006

AbstractA novel compact H‐plane horn antenna constructed is proposed for substrate integrated rectangular waveguide with ξr = 10.2. It has a dielectric arc lens for better directivity and a simple microstrip transition as feed. The horn, the lens, and the transition share the same substrate. The measured gain of this antenna is about 9 dB; the bandwidth, at 10 dB return loss, is over 12%, and the antenna size is 39.175 × 14 × 2 mm3. The frequency band is 25.5–28.5 GHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 168–178, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22086
Photonic microphone based on a dual‐core multimode fiber head combined with a micromirror diaphragm
Authors: Song Ju‐Han , Lee Sang‐Shin 
Published: November 2006

AbstractA compact photonic microphone has been proposed and realized, incorporating a dual‐core multimode fiber (MMF) block combined with a reflective micromirror‐based diaphragm. The fiber block, where two MMFs are aligned and tilted toward each other with an angle, played a role as an optical head used to transfer light to and from the diaphragm. And the membrane‐type micromirror made of a silicon film coated with gold films was implemented to be suspended via a thin bar connected to a silicon frame, thereby enabling dynamic displacement induced by applied acoustic waves. For the demonstrated microphone, its static characteristics were first examined to find out the operating point defined as the optimum distance between the optical head and the diaphragm. Its measured frequency response was examined to exhibit an operation bandwidth of 3 kHz with the variation of ∼5 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 135–137, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22088
Application of the Foldy–Lax multiple scattering method to the analysis of vias in ball grid arrays and interior layers of printed circuit boards
Authors: Ong C.‐J. , Miller D. , Tsang L. , Wu B. , Huang C.‐C. 
Published: November 2006

AbstractThe authors applied the method of Foldy–Lax multiple scattering equations to multiple vias in ball grid arrays and the interior layers of printed circuit boards. The method gives the scattering parameters of the array. The results are verified with Ansoft's HFSS with very little difference between the Foldy–Lax approach and the HFSS results. The CPU required for the method is only a small fraction of the time that HFSS requires. For a 16 × 16 array of vias, the method calculates all the S‐parameters of the 512 ports in 4 min for 10 frequencies on a Pentium 3.2 GHz PC. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 225–231, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22091
Application of high impedance electromagnetic surface to archimedean planner spiral antenna
Authors: Wang Chao , Yan Dun‐bao , Yuan Nai‐chang 
Published: November 2006

AbstractA new type of artifical metallic electromagnetic structure, high impedance electromagnetic surface (HIS), has been developed that is characterized by having high surface impedance. In this paper, the HIS is used as the antenna ground plane to suppress the propagation of surface waves and improve performance of Archimedean planner spiral antenna. Measured results reveal that the HIS can remarkably increase the gain of main lobe, decrease the back lobe, and reduce the mutual coupling between receiving antenna and transmitting antenna. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 129–131, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22097