bluuebunny/crossref_metadata_2025_split huggingface dataset:
High temperature pulsed measurements of AlGaN/GaN HEMTs on high resistive Si(111) substrate
Authors: Werquin M. , Ducatteau D. , Vellas N. , Delos E. , Cordier Y. , Aubry R. , Gaquière C. 
Published: August 2006

AbstractDC‐ and RF‐pulsed measurements of AlGaN/GaN HEMTs on high resistive silicon (111) substrate are achieved under probes in the 300–525 K temperature range. Current collapse and heating effects are studied and it demonstrates the high temperature properties of these devices. Hence the potential of this technology for power applications at microwave frequencies is confirmed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2301–2305, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21897
Design and fabrication of integrated film bulk acoustic resonator and filter on silicon nitride membrane
Authors: Park Jae Yoeng , Lee Hee Chul , Cheon Seong Jong 
Published: August 2006

AbstractIn this paper, fully integrated film bulk acoustic resonators (FBARs) and filter have been designed, fabricated, and characterized by using silicon bulk micromachining technology. The fabricated resonator is comprised of aluminum nitride (AlN) piezoelectric material sandwiched by two molybdenum (Mo) electrodes on top of silicon nitride thin membrane. The developed AlN piezoelectric film has 1.9° of FWHM (full width half maximum) of rocking curve and approximately 70 Mpa in tensile stress on top of the Mo electrode. The fabricated FBAR has a quality factor of 1530 in size of 200 × 200 μm2, insertion loss of −0.45 dB, and return loss of −28 dB, respectively. The fabricated FBAR ladder type filter is comprised of 7 resonators with 3 resonators in series and 4 resonators in parallel. It has insertion loss of −3.2 dB and ripple of 0.4 dB in pass band, absolute attenuation of 40 and 50 dB at 1.6–1.875 GHz and 2.110–2.170 GHz, respectively. The size of the fabricated FBAR filter is 1.2 mm × 1.4 mm before packaging and 3 mm × 3 mm after packaging, respectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2230–2233, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21905
Broadband and high‐gain microstrip slot antenna
Authors: Yao Feng‐Wei , Zhong Shun‐Shi 
Published: August 2006

AbstractA novel microstrip slot antenna backed by a ground plane of large bandwidth and high gain is presented. A fan‐shaped termination of a microstrip feeder with a straight stub is used to excite a rectangular slot and a circular patch to realize the broadband characteristic. Its measured voltage standing wave ratio (VSWR) ≤2 bandwidth reaches ∼102%, covering 1.97–6.05 GHz with the ratio bandwidth of 3.07:1. The measured antenna gain is 5.5–7.8 dB over the entire bandwidth. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2210–2212, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21907
Electronically controlled reciprocal phase shifter
Authors: Collin G. , Ditchi T. , Géron E. , Holé S. 
Published: August 2006

AbstractA reciprocal phase shifter principle is proposed, of very simple design with only one control voltage, which enables the continuous variation of the phase at a frequency of 1.89 GHz. An implementation on Teflon substrate using Wilkinson dividers and a second‐order filter using one variable capacitor is presented. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2301–2303, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21911
Coplanar waveguide‐fed band‐selective filter for wideband antenna
Authors: Wang Chien‐Jen , Wu Jin‐Wei 
Published: August 2006

AbstractIn this study, a coplanar waveguide‐fed band‐selective filter and a spiral slot antenna have been designed, fabricated, and integrated for the applications of multisystem integration. The antenna module was fabricated on the same plane of the substrate, so that the circuit process and the position alignment could be simplified. The passband responses of the filter ranging below 2.6 GHz and from 5.0 to 6.0 GHz cover most of the commercial wireless communication systems. Simulated results are compared with measurements performed on the antenna module. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2264–2267, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21915
A dual degenerate mode X‐band bandpass filter in LTCC
Authors: Tan Boon Tiong , Chew Siou Teck , Leong Mook Seng , Ooi Ban Leong 
Published: August 2006

AbstractA wideband dual mode bandpass filter at 9.0 GHz with a bandwidth of 20% has been demonstrated in low temperature cofired ceramics (LTCC). A new stacked‐ring resonator (SRR) is proposed and its design methodology as well as analysis is presented in details. The simulated and measured results are in good agreement. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2246–2249, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21917
Harmonic suppression in parallel coupled microstrip bandpass filter with embedded C‐shaped EBG cells
Authors: Wu Hung‐Wei , Chang Sheng‐Hsiung , Weng Min‐Hang , Kuan Hon , Su Yan‐Kuin 
Published: August 2006

AbstractIn this article, harmonic suppression of a parallel coupled microstrip bandpass filter (BPF) with C‐shaped electromagnetic bandgap (EBG) cells embedded on the middle layer is investigated. The embedded C‐shaped EBG cells patterned on the middle layer add a good stopband‐rejection mode to the second harmonics of the parallel coupled microstrip BPF with suppression of over −40 dB, without affecting the center frequency and insertion loss of the original designed BPF. The experimented results matched the simulated results well. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2244–2246, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21918
Backlobe reduction for vertical patch antenna
Authors: Lau Ka‐Lam , Wong Ting‐Pong , Luk Kwai‐Man , Lee Kai‐Fong 
Published: August 2006

AbstractABSTRACT: This paper presents a modified ground plane design for a circular vertical patch antenna (VPA). The circular‐VPA is surrounded by a circular corrugated ground and it has around 10% impedance bandwidth and 8 dBi gain. This design yields a significant reduction in cross‐polarization radiation and back radiation levels over a bandwidth in excess of 9.5%. A 15 dB reduction in the cross‐polarization and 15 dB suppression in the backlobe were obtained at the center frequency. Stable and broadside patterns are maintained across the matching band. Details of the proposed antenna, simulation and experimental results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2297–2299, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21925
Experimental verification of the relation between the radar cross section and the list angle of surface vessels
Authors: Ojeda J. F. Pérez , Rodríguez J. L. , García‐Tuñón I. , Obelleiro F. 
Published: August 2006

AbstractIn this paper, the effect of ship angular motions on the radar cross section is addressed. To this end, a set of measurements for different ships were conducted from a shore‐based instrumental radar. The targets execute oblique straight trajectories with respect to the radar line of sight with induced roll. The analysis of the dependence between target reflectivity and the roll angle shows that, for conventional vessels, the maximum response at low grazing angles is achieved in steady conditions, and it varies significantly according to the sign of the roll angle referred to the radar location. This result is confirmed by the comparison of measurements of a ship performing turning circles at several speeds, thus inducing different roll angles. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2237–2241, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21932
Using tap basis to implement the equivalence principle algorithm for domain decomposition in integral equations
Authors: Li Mao‐Kun , Chew Weng Cho 
Published: August 2006

AbstractA domain decomposition scheme based on the equivalence principle, also known as Huygens' principle, for integral equation solvers and the method of moments is introduced here. The equivalence principle allows the replacement of unknown currents distributed in a volume in space by equivalent currents residing on the surface that bounds the volume. In this manner, a problem of high complexity can be replaced by a surface of simpler shape. A tap basis is introduced to model the current that intercepts with the equivalence surfaces. Using this scheme, the current continuity is conserved and the singularity of the charges is avoided. The solution is shown to be accurate. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2218–2222, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21933
Single‐feed elliptical dielectric resonator antennas for circularly polarized applications
Authors: Yang S. L. Steven , Chair Ricky , Kishk A. A. , Lee K. F. , Luk K. M. 
Published: August 2006

AbstractA single‐feed elliptical shape dielectric resonator antenna (DRA) is designed for circular polarization application. The antenna is simple in structure and could be excited by either a probe or a narrow aperture. This antenna excites two degenerate orthogonal modes with 90° phase difference. From experimental studies, the single probe feed DRA achieves 5.2% 3‐dB axial ratio (AR) bandwidth and 17.3% impedance matching bandwidth (S11 < −10 dB), and the single aperture feed DRA achieves 4.2% AR bandwidth and 26.5% impedance matching bandwidth. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2340–2345, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21937
Ultrabroad tunable wavelength conversion in a semiconductor optical amplifier
Authors: Lu Z. G. , Bock P. , Liu J.R. , Florjanczyk M. , Hall T. 
Published: August 2006

AbstractBy using two orthogonally‐polarized pump beams, an over 10.66 THz tuning range wavelength converter is demonstrated with uniform conversion efficiency and equalized signal‐to‐noise ratio (SNR) through four‐wave mixing in semiconductor optical amplifier. The pumping‐beam effects on both conversion efficiency and SNR of the converted signals are investigated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2139–2142, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21938
Circularly polarized broadband high‐efficiency active integrated antenna
Authors: Gao S. , Qin Y. , Sambell A. 
Published: August 2006

AbstractThis letter presents a circularly polarized (CP) broadband high‐efficiency active integrated antenna, where the broadband CP antenna is integrated directly with a broadband high‐efficiency class‐E power amplifier (PA). To achieve CP operation, a series feed using an L‐shaped microstrip feed line below the ground plane is used to provide a 90° phase shift between crossed slots. The antenna serves both functions of a broadband CP radiator and a broadband harmonics‐termination load network for the class‐E PA. Measures results demonstrate both broadband CP radiation and high efficiency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2145–2148, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21940
Dual‐band internal WLAN antenna for 2.4/5 GHz laptop PC applications
Authors: Cho Young Jun , Shin Yong Sun , Park Seong‐Ook 
Published: August 2006

AbstractThis paper presents a dual‐band internal WLAN PIFA for 2.4/5 GHz laptop applications in consideration of the influences of laptop housing and LCD. The prototype antenna is modified when installed along the perimeter of the display panel of the laptop housing. The proposed antenna has a small ground plane and achieves an impedance bandwidth of 250 MHz (2.37–2.62 GHz(in Bluetooth band and 950 MHz (4.98–5.93 GHz(near 5 GHz in WLAN band within 2:1 voltage standing wave ratio (VSWR(. It also shows good antenna gain with small volume. These features make it an alternative for use in dual‐band WLAN antennas. Design details for the proposed antenna in the case of the antenna itself, and the application of laptop PC housing are described, and experimental results of the antenna achievements are investigated and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2349–2354, 2006;Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.21943
High‐power emission, narrow‐beam scanning, and sub‐wavelength imaging using conducting gratings and left‐handed materials
Authors: Li Zhuo , Cui Tie Jun , Zhang Jian Feng 
Published: August 2006

AbstractMany amazing properties of a novel electromagnetic (EM) structure, consisting a conducting grating backed with a left‐handed material (LHM) slab, are studied. High‐directivity, high‐power emission and narrow‐beam scanning can be easily realized when this structure acts as an antenna. Simultaneously, if it works as an imaging system, extremely high resolution can also be obtained with the unique EM behaviors of the LHM. Proper usage of surface waves on apertures opened in the conducting screen makes this structure possess such attractive capabilities. In order to investigate such phenomena, a more general EM model is first developed through the equivalence principle, and then the method of moments is implemented to obtain the interesting results. All these amazing properties are clearly observed through the numerical results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2359–2365, 2006;Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.21944
Tunable polarization optical delay line based on a linear chirped fiber Bragg grating
Authors: Nogueira Rogério N. , da Rocha José R. F. , Pinto João L. 
Published: August 2006

AbstractA new technique for inducing relative group delays between the orthogonal transversal propagation modes in a single mode fiber is presented. It is based on a tunable linear chirp induced in a Bragg grating written in a highly birefringent fiber by thermal means. The method can induce a relative delay over a wide range, making it possible for use in a polarization mode dispersion compensator. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2357–2359, 2006; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.21945
Orthogonal projection sampling method used in reconstruction of incomplete data field
Authors: Hongbing Yao , Xia Ye , Jun Zhou , Anzhi He 
Published: August 2006

AbstractAn orthogonal projection sampling method is proposed in this paper for the reconstruction of incomplete data field by using the prior knowledge algorithm based on the modified algebra reconstruction technology (ART) in the optical computerized tomography (OCT). Experiments based to this method are studied. The satisfying reconstruction results are obtained with less sampling projection numbers and limited sampling angular range. The results indicate that orthogonal projection sampling can improve the precision in the reconstruction of incomplete data, and the precision reaches 10%. © 2006 Wiley Periodicals,Inc. Microwave Opt Technol Lett 48:2333–2336, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21947
A compact microstrip bandpass filter using folded parallel‐coupled‐lines
Authors: Gu Jian‐Zhong , Sun Xiao‐Wei 
Published: August 2006

AbstractA bandpass filter using spiral parallel‐coupled‐lines is presented for size reduction. Based on the conventional parallel‐coupled‐line structures, different folded number and coupling structures are proposed for comparison. The band‐pass filter with three cells in series is constructed operating from 1.8 GHz to 2.5 GHz. The upper stop‐band suppression at 200 MHz offset is more than 30 dB. The band‐pass filter size is 70% smaller. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2328–2330, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21949
Protolytic properties of polyamine wasp toxin analogues studied by13C NMR spectroscopy
Authors: Strømgaard Kristian , Piazzi Lorna , Olsen Christian A. , Franzyk Henrik , Jaroszewski Jerzy W. 
Published: August 2006

AbstractAcid–base properties of the natural polyamine wasp toxin PhTX‐433 (1) and seven synthetic analogues [PhTX‐343 (2), PhTX‐334 (3), PhTX‐443 (4), PhTX‐434 (5), PhTX‐344 (6), PhTX‐444 (7), and PhTX‐333 (8)], each having four protolytic sites, were characterized by13C NMR spectroscopy. Nonlinear, multiparameter, simultaneous fit of all chemical shift data obtained from the NMR titration curves yielded macroscopic pKavalues as well as intrinsic chemical shift data of all differently protonated macrospecies. Analyses of the chemical shift data demonstrated strong interactions between all four sites and provided information about complex relationships between chemical shift values and protonation state. Deprotonation of fully protonated forms starts at the central amino group of the polyamine moiety, and the extent of this trend depends on the distance to the flanking, protonated amino groups. The pKa1values of 1–8 are in the range 8.2–9.4. Hence, some of the toxins are incompletely protonated at the pH and ionic strength conditions used for assessment of their interactions with ionotropic glutamate and nicotinic acetylcholine receptors, and the degree of protonation is expected to have pharmacological importance in the ion‐channel binding event. Copyright © 2006 John Wiley & Sons, Ltd.
Differentiation of female primordial germ cells in the male testes of chicken (Gallus gallus domesticus)
Authors: Tagami Takahiro , Kagami Hiroshi , Matsubara Yuko , Harumi Takashi , Naito Mitsuru , Takeda Kumiko , Hanada Hirofumi , Nirasawa Keijiro 
Published: August 2006

AbstractIn our previous studies, we demonstrated that female primordial germ cells (PGCs) have the ability to differentiate into W chromosome‐bearing (W‐bearing) spermatozoa in male gonads of germline chimeric chickens. In this study, to investigate the differentiation pattern of female PGCs in male gonads in chickens, three germline chimeric chickens were generated by injecting female PGCs into the male recipient embryos. After these male chimeras reached sexual maturity, the semen samples were analyzed for detecting W‐bearing cells by PCR and in situ hybridization analyses. The results indicated that the female PGCs had settled and differentiated in their testes. A histological analysis of the seminiferous tubule in those chimeras demonstrated that the W‐bearing spermatogonia, spermatocytes, and round spermatids accounted for 30.8%, 32.7%, and 28.4%, respectively. However, the W‐bearing elongating spermatid was markedly lower (7.7%) as compared to the W‐bearing round spermatid. The W‐bearing spermatozoa were hardly ever observed (0.2%). We concluded that although female PGCs in male gonads are capable of passing through the first and second meiotic division in adapting themselves to a male environment, they are hardly complete spermiogenesis. Mol. Reprod. Dev. 74: 68–75, 2007. © 2006 Wiley‐Liss, Inc.
Involvement of GnRH neuron in the spermatogonial proliferation of the scallop, Patinopecten yessoensiss
Authors: Nakamura Satoshi , Osada Makoto , Kijima Akihiro 
Published: August 2006

AbstractThe aim of this study was to quantitatively analyze a pattern of proliferation of gonial cells and to demonstrate neural involvement in spermatogonial proliferation of the scallop by the in vitro experiment. Immunocytochemistry for incorporated BrdU was used to identify mitotically active gonial cells. The pattern of proliferation of gonial cells was divided into two phases: phase I; oogonia and spermatogonia slowly proliferate through the growing stage: phase II; oogonia develop into oocytes and spermatogonia start to proliferate rapidly from the mature stage through the spawning stage. The neurons detected with anti‐mammalian (m)GnRH antibody were distributed sparsely in the pedal ganglion and predominantly in the cerebral ganglion of both sexes at the growing stage. The extracts from the cerebral and pedal ganglion (CPG) of both sexes collected at the growing stage promoted proliferation of spermatogonia in the in vitro culture of the testicular tissue as well as mGnRH. However, CPG extract had no effect on oogonial proliferation. The increased mitotic activity induced by CPG and mGnRH was abolished by the addition of mGnRH antagonists and anti‐mGnRH antibody, suggesting that the spermatogonial proliferation is regulated by GnRH‐like peptide in CPG of the scallop. The same mitotic activity as CPG extract and mGnRH was observed in the hemocyte lysate, but not in the serum. These findings suggest that the spermatogonial proliferation at phase II in the scallop may be under the neuroendocrine control by GnRH neuron in CPG. Mol. Reprod. Dev. 74: 108–115, 2007. © 2006 Wiley‐Liss, Inc.
Optimization of a microarray based approach for deriving representative gene expression profiles from human oocytes
Authors: Jones Gayle M. , Song Bi , Cram David S. , Trounson Alan O. 
Published: August 2006

AbstractThe purpose of the present study was to optimize a protocol for deriving reproducible and representative gene expression profiles from very rare research samples of human oocytes using microarrays. Immature oocytes produced as a result of administration of gonadotrophins for the treatment of infertility were donated to research. Linear amplification (L‐amp) and exponential amplification (E‐amp) were both capable of generating sufficient product for hybridization to the microarrays even from the low amount of template mRNA present in a single human oocyte. Slightly higher numbers of transcripts were detected by microarray following linear rather than E‐amp but both techniques generated a product with reliably reproducible sensitivity and fidelity providing oocytes were pooled in minimum numbers of three. The majority of the variance associated with amplification and hybridization to arrays comes from the molecular processing. Slightly greater additional variance is associated with biological differences in immature oocytes from the same or different donors. The findings suggest that representative gene expression profiles can be generated from human oocytes for comparative purposes following L‐amp and hybridization to microarray. However, oocytes must be pooled for the starting template for each array and sufficient independent microarray experiments performed to minimize the variance associated with molecular processing. Mol. Reprod. Dev. 74: 8–17, 2007. © 2006 Wiley‐Liss, Inc.