bluuebunny/crossref_metadata_2025_split huggingface dataset:
Guided modes characteristics in a fiber with left‐handed material
Authors: Shen LuFa , Wang ZiHua 
Published: March 2007

AbstractA fiber with left‐handed material as the core, and right‐handed material as the cladding has been analyzed by using Maxwell's equations. A Helmholtz equation is obtained and solved. Thus, some characteristic equations are obtained and studied further. Some novel propagation characteristics in LHM fiber are obtained. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1039–1041, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22335
New micromachined interdigital coplanar waveguide
Authors: Sun Xiaofeng , Ding Guifu , Gu Donghua , Li Binhong , Shen Minyi 
Published: March 2007

AbstractA novel interdigital coplanar waveguide (CPW) has been designed and fabricated and its characteristics have been studied as a function of transmission line parameters. In this interdigital CPW, the ground conductors are thickened by micromachining techniques, which are helpful for reducing the interference between the adjacent parallel sections of center conductor. Within the frequency range from 5 to 20 GHz, the return loss of this structure has two minimal values whose positions change with the structural parameters. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1007–1010, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22336
Broadband circularly polarized wide‐slot antenna
Authors: Xu R. P. , Huang X. D. , Cheng C. H. 
Published: March 2007

AbstractA new broadband single‐fed circularly polarized (CP) wide‐slot antenna is presented in the letter. The antenna is composed of a wide‐slot, with a T‐shaped stub and a microstrip T‐junction. The CP operation is realized by the interaction from the T‐shaped stub on the wide‐slot and the T‐junction. The antenna has been investigated numerically and experimentally. Measured result shows that the antenna has an impedance bandwidth of 58% and a 3‐dB bandwidth of axial ratio of 22.2%. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1005–1007, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22337
Novel microstrip, rectangular ferrite, circulator
Authors: Adams Ryan S. , Young Jeffrey L. , O'Neil Benton 
Published: March 2007

AbstractThis letter presents a microstrip circulator topology with a rectangular ferrite region. Optimized networks are designed to maximize transducer power gain and to satisfy the perfect circulation condition with a 50 Ohm termination. The design is validated with measured data showing that 20% bandwidth centered at 10 GHz with a 14 dB isolation specification is achievable. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1036–1039, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22338
Comparison between HIE‐FDTD method and ADI‐FDTD method
Authors: Chen Juan , Wang Jianguo 
Published: March 2007

AbstractThis letter gives the comparison of the 3D hybrid implicit–explicit finite‐difference time‐domain (HIE‐FDTD) method with the ADI‐FDTD method through numerical examples. It shows that the HIE‐FDTD method has higher accuracy than the ADI‐FDTD method, especially for larger rate of field variation; the time step size, which has a detrimental effect on the accuracy of ADI‐FDTD, does not affect the accuracy of HIE‐FDTD method. The computation efficiency of the HIE‐FDTD method is higher than ADI‐FDTD method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1001–1005, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22340
Integrated low‐profile dual loop‐dipole antennas using an embedded electromagnetic bandgap structure
Authors: Kim Jaehoon , Rahmat‐Samii Yahya 
Published: March 2007

AbstractElectrical characteristics of an electromagnetic bandgap (EBG) structure embedded in a high dielectric layer are studied using FDTD simulation methods. A low‐profile loop antenna is designed above the embedded EBG structure. For diversity applications in wireless communications and biotelemetry, a printed dipole antenna is also incorporated with the low‐profile loop antenna. The experimental results of the antennas are compared with the simulated results, to show how applicable embedded EBG structures are for low‐profile antenna designs. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1085–1089, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22342
The design of a novel waveguide monopulse feeder for linear phased array antenna
Authors: Kim Chan Hong , Lee Yong Hee , Myung Noh Hoon 
Published: March 2007

AbstractThis paper presents a novel type of waveguide monopulse feeder, which has the concept of a space feed, suitable for liner phased array antenna. The design methods and measurement results of the 2‐to‐39 port feeder at X‐band are described. Measurement results show that this feeder has characteristics of the required optimum 1‐D monopulse power distribution, low insertion loss and good input match. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1106–1109, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22347
Enhanced wideband and compact size fractal Kokh antenna
Authors: Mirzapour Babak , Neyestanak Abbas Ali Lotfi 
Published: March 2007

AbstractA novel wideband and compact size fractal Kokh antenna is described in this article. The return‐loss, E‐plane and H‐plane radiation pattern of the proposed antenna are measured and simulated by Finite Element method. Both experimental and numerical results show that the proposed antenna has smaller size and wideband behavior respect to similar fractal Kokh antenna designs. The Proposed antenna is able to achieve an impedance bandwidth of 19% for VSWR less than 2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1077–1080, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22349
Ultra‐wideband bandpass filter with a compact two‐layered structure
Authors: Qu Xinan , Zhong Shun‐Shi , Liu Jie 
Published: March 2007

AbstractA novel ultra‐wideband (UWB) bandpass filter with a compact size is proposed. By using a two‐layered substrate configuration and an H‐shaped slot on the ground, a vertical‐coupled microstrip resonator structure is formed. Three resonant peaks of the proposed structure are extracted around the lower end, the center, and the upper end of the UWB passband. The compact two‐layered filter has an overall length of about a half guided wavelength at the center UWB frequency and exhibits promising performance for UWB applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49:1049–1051, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22351
Multitap coherence‐free photonic RF filter employing semiconductor optical amplifier
Authors: Zheng Rong , Alameh Kamal , Lee Yong Tak , Wang Zhenglin 
Published: March 2007

AbstractA novel multitap coherence‐free photonic bandpass RF filter utilizing the cross‐gain modulation property of the semiconductor optical amplifier to convert a coherent RF‐modulated laser carrier to a low‐coherence light that is sliced and delayed to realize a stable transversal RF filter. An 8‐tap photonic RF bandpass filter operating at 2.25 GHz with more than 15 dB rejection is experimentally demonstrated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1103–1106, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22352
Meandering probe fed patch antenna with high gain characteristic for circularly polarized application
Authors: Lai Hau‐Wah , Luk Kwai‐Man 
Published: March 2007

AbstractA meandering probe‐fed circularly polarized stacked patch antenna with truncated corners is studied. The antenna has a wide 3‐dB axial ratio bandwidth of 12%. It exhibits a stable radiation pattern across the axial ratio bandwidth. The antenna has low cross polarization and high gain, which are −14 dB and 10 dBi, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1095–1098, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22357
Ultraflat supercontinuum generation in a dispersion‐flattened microstructure fiber
Authors: Zhang Xia , Ren Xiaomin , Xu Yongzhao , Wang Zinan , Huang Yongqing 
Published: March 2007

AbstractWe demonstrate the generation of an ultraflat supercontinuum from an 80‐m long dispersion‐flattened microstructure fiber when coupling a 1.6‐ps pump pulse at a wavelength of 1550 nm. Over 1000 channels of 10‐GHz spacing are generated in a bandwidth of 80 nm, with a flatness of ±1.5 dB in the 1550‐nm band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49:1062–1064, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22362
A novel substitute design for low pass strip line filter
Authors: Bu Shirong , Luo Zhengxiang , Yang Kai , Liu Juanxiu , Ning Junsong 
Published: March 2007

AbstractA low pass strip line filter is fabricated by microstrip line design. This substitute method is validated by simulated and tested results. This method can be used in the design of TEM planar passive circuits. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1175–1178, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22365
Accurate computation of wide‐band response of electromganetic scattering problems via Maehly approximation
Authors: Chen Mingsheng , Wu Xianliang , Huang Zhixiang , Sha Wei 
Published: March 2007

AbstractThe best uniform rational approximation, performed by the Maehly approximation, is applied to the method of moments (MOM) to obtain the radar cross section (RCS) over a broad frequency band. Numerical results for three dimensional arbitrarily shaped perfectly electrically conducting (PEC) bodies are considered. Compared with the asymptotic waveform evaluation (AWE) technique, the presented technique is found to be efficient in much broader frequency band with lower memory required. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1144–1146, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22367
A high‐frequency and high‐power quasi‐class‐E amplifier design using a finite bias feed inductor
Authors: Van Ju‐Ho , Kim Min‐Su , Jung Sung‐Chan , Park Hyun‐Chul , Ahn Gunhyun , Park Cheon‐Seok , Kim Byung‐Sung , Yang Youngoo 
Published: March 2007

AbstractThis paper presents a design method for a compact high‐efficiency quasi‐class‐E amplifier, using a finite bias feed inductor. It is very difficult to achieve proper class‐E operation from high‐power transistors operating in the high‐frequency region because of their internal parasitic components. To mitigate the effects of internal parasitic components on class‐E operation, a finite DC feed inductance is introduced to resonate out the capacitive parasitic components. A quasi‐class‐E amplifier with a finite DC feed inductor was designed and implemented at 1.2 GHz using a high‐power laterally diffused metal‐oxide‐semiconductor field‐effect transistor (LDMOSFET). We compared simulated time domain current and voltage waveforms with ideal ones. As the test results indicated, power‐added efficiency as high as 70.4% was achieved, at high output power of 39.55 dBm, without losing the circuits' simplicity, one of the most important advantages of class‐E operation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1114–1118, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22368
RF stationary waves integrated Fourier transform spectrometer
Authors: Hemour S. , Podevin F. , Rauly D. , Xavier P. 
Published: March 2007

AbstractWe describe here a new type of analog correlators based on stationary waves recovery and spatial Fourier transformation. The theoretical basis of the stationary waves integrated Fourier transform spectrometer (SWIFTS) is first introduced. Based on robust physical principles validated by circuits type simulations, the spectrometer could be an interesting competitor to actual RF analog correlators. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1138–1142, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22375
Gain enhancement of a dielectric resonator antenna with use of surface mounted short horn
Authors: Nasimuddin  , Esselle Karu P. 
Published: March 2007

AbstractWe demonstrate the gain of a standard rectangular dielectric resonator antenna (DRA) enhanced by integrating it with a surface mounted short horn (SMSH). An enhancement of gain by 3.8 dB to 8.5 dBi at 5.95 GHz, and a 10 dB return bandwidth of 3.2% has been achieved from this configuration. Total height of the fabricated structure is only 0.172 λ0, or 8.61 mm at 6.0 GHz, and the aperture size is 0.96 λ0 × 0.86 λ0, or 48.1 mm × 43.1 mm. The cross‐polarization level of the antenna is <33 dB in both E‐ and H‐planes. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1162–1166, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22379
Dual‐band monopole antenna excited by a capacitive coupling feed for WLAN applications
Authors: Huang Chih‐Yu , Lin Hsiao‐Cheng , Kuo Jieh‐Sen 
Published: March 2007

AbstractA printed dual‐band T‐shaped monopole antenna with a shorted strip fed by a coupling microstrip line for wireless communication in the wireless local‐area network (WLAN) band is studied. The proposed antenna can provide two separate impedance bandwidths of 101 MHz (about 4.1% centered at 2.45 GHz) and 1490 MHz (about 27% centered at 5.5 GHz), making it easier to cover the required bandwidths for WLAN operation in the 2.45 GHz band (about 3.4% bandwidth required) and 5.2/5.8 GHz bands (about 13% bandwidth required). We can easily find the enhancement of impedance bandwidth by using capacitive coupling feed. Details of the proposed antenna design and experimental results are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1135–1138, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22380
Ultra‐wideband planar shorted dipole antenna with two C‐shaped arms for wireless communications
Authors: Li Wei‐Yu , Wong Kin‐Lu , Su Saou‐Wen 
Published: March 2007

AbstractA novel ultra‐wideband (UWB) planar shorted dipole antenna capable of generating a 9:1 bandwidth (820–7340 MHz) covering the present‐day mobile communication systems (AMPS, GSM, DCS, PCS, UMTS) and WLAN systems in the 2.4/5.2/5.8 GHz bands is presented. The proposed planar antenna is easily fabricated from a metal plate and is generally in the form of the dipole antenna with two C‐shaped radiating arms short‐circuited to each other through two shorting strips. By selecting a proper length of the shorting strips, the proposed antenna can have the lower edge frequency of its operating band reduced to be as low as 820 MHz, with a compact size of 109 × 170 mm2. The proposed antenna is studied in detail in the article. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1132–1135, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22381
Ka‐band 0.18 μm CMOS low noise amplifier with 5.2 dB noise figure
Authors: Chang Win‐Ming , Hsiung Zi‐Hao , Jou Christina F. 
Published: March 2007

AbstractA Ka‐band low noise amplifier (LNA) using three cascaded stages was designed and implemented in a standard 0.18 μm CMOS technology. The fabricated Ka‐band LNA achieves power gain (S21) above 12 dB from 30 to 32 GHz and a minimal noise figure of 5.2 dB at 31.5 GHz. The three cascaded stages LNA consume 15.58 mA from 1 V power supply. Compared with the recent published literatures, this LNA operates at the highest frequency ever reported by standard bulk 0.18 μm CMOS process. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1187–1189, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22383
A low phase noise design for ultrawideband frequency synthesizer
Authors: Chang Po‐Yang , Wu Hui‐I , Jou Christina F. 
Published: March 2007

AbstractA low phase‐noise frequency synthesizer design for ultrawideband is demonstrated in a 0.18‐μm CMOS process. It combines a low phase‐noise voltage‐controlled oscillator with two‐stage dividers and a switched buffer multiplexer with low layout complexity. Because of the symmetrical independent architecture of this switch buffer design, it can reduce the additional phase noise created by the traditional multiplexer stage. Here, this low phase noise design in three LO bands (8448, 4224, and 2112 MHz) is demonstrated. The measurement shows that in these three LO band, this new structure can achieve phase noise of less than −121 dBc/Hz at 1 MHz offset. The frequency tuning range is 10% while consuming only 52.2 mW from a 1.8‐V supply. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1159–1162, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22384
Novel design of a dual‐frequency and a multi‐frequency microstrip antenna
Authors: Huang Zhenhua , Zhou Xilang , Niu Jiaxiao , Chen Junhua 
Published: March 2007

AbstractA novel H‐shaped dual‐frequency microstrip antenna has been investigated. This novel microstrip antenna is considered to be composed of two microstrip dipoles, which resonate at the antenna's two operating frequencies, respectively. The resonant frequencies are predicted. Return loss, radiation patterns of the antenna have been investigated numerically and experimentally, and good agreement is achieved. Furthermore, the size of the antenna is more compact than conventional H‐shaped antennas. Then a modified H‐shaped multi‐frequency microstrip antenna is proposed. Simulation and experimental results are also presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1129–1131, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22386
Characteristic of the ultra‐wideband electromagnetic radiation generated by PCSS
Authors: Ruan Chi , Zhao Wei , Chen Guo‐Fu , Zhu Shao‐Lan 
Published: March 2007

AbstractA novel ultra‐wideband electromagnetic pulse generating method based on the photoconductive semiconductor switches (PCSS) is presented. Gallium arsenide is used to develop the PCSS for an ultrashort electromagnetic pulse source. The pulse generated by such PCSS is within picosecond (ps) time scale, and can yield power pulse with an voltage over 10 kV. The experimental results show that the pulses are stable, with the peak–peak amplitude change of 6% and the time jitter within several picoseconds. The radiations of the PCSS triggered by the picosecond laser and femtosecond laser pulse series illustrate that the electromagnetic pulses would have high repetition of more than 80 MHz and frequency bandwidth of DC‐6 GHz. The radiations of “lock‐on” mode of the PCSS are also analyzed here. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1118–1122, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22393
Improved high rejection for notch filter using square ring resonator with flexible electromagnetic coupling
Authors: Harikrishna J. V. S. , Karekar R. N. , Aiyer R. C. 
Published: March 2007

AbstractA novel technique of electromagnetic coupling for microstrip notch filter is reported, It employs a full wave (λg) square ring microstrip resonator for 2.4 GHz with one arm (λg/4) coupled electromagnetically to a 2‐port 50‐Ω feed line, under it. The square ring resonator and feed line are on two separate TMM4 (εr = 4.5) substrates. Electromagnetic coupling not only offers improved rejection but also the flexibility in various ways, for example, for easy replacement of resonator. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1201–1203, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22396
60‐GHz transceiver module with coplanar ribbon bonded planar millimeter wave bandpass filter
Authors: Choi Sung Tae , Yang Ki Seok , Tokuda Kiyohito , Kim Yong Hoon 
Published: March 2007

AbstractA small size 60‐GHz full duplex transceiver module is developed for high data rate millimeter wave wireless access link. To realize a compact and low cost transceiver module, a planar millimeter wave bandpass filter is integrated by using broadband coplanar ribbon‐bond interconnects in the module. The overall size of the module except input and output connectors is 50 mm × 75 mm × 23 mm. The measured RF output power is 16 dBm at 1‐dB compression, with conversion gain of 30.6 dB and the conversion gain of the receiver being 23.4 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1212–1214, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22399
Erratum: Integral equation‐based overlapped domain decomposition method for the analysis of electromagnetic scattering of 3D conducting objects
Authors: Li Wei‐Dong , Hong Wei , Zhou Hou‐Xing 
Published: March 2007

AbstractOriginally published Microwave Opt Technol Lett 49: 265–274, 2007. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1225–1230, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22479
Functional connectivity in the pharmacologically activated brain: Resolving networks of correlated responses to d‐amphetamine
Authors: Schwarz Adam J. , Gozzi Alessandro , Reese Torsten , Bifone Angelo 
Published: March 2007

AbstractWe investigated the functional connectivity structure underlying the widespread relative cerebral blood volume (rCBV) response to d‐amphetamine in the rat brain by systematically analyzing the intersubject correlations between the response amplitudes in 48 atlas‐defined brain structures. A cluster analysis resolved three distinct networks of brain regions that exhibited closely coupled responses: one corresponding to primary dopamine projections from the midbrain to the striatum, a second consisting predominantly of forebrain cortical and basal ganglia regions that share a widespread correlation pattern resembling the univariate group response, and a third including structures in the periventricular dopamine system. These results suggest that different functional networks underlie the brain's response to d‐amphetamine. This approach may provide important new insights regarding the central systems that underlie pharmacological action. Magn Reson Med 57:704–713, 2007. © 2007 Wiley‐Liss, Inc.
Independent phase modulation for efficient dual‐band 3D imaging
Authors: Hargreaves Brian A. , Cunningham Charles H. , Pauly John M. , Daniel Bruce L. 
Published: March 2007

AbstractCertain applications of MRI, such as bilateral breast imaging, require simultaneous imaging of multiple volumes. Although image data can be acquired sequentially, the SNR is often improved if both slabs are excited and imaged together, typically with phase encoding across a volume including both slabs and the space between them. The use of independent phase modulation of multiple slabs eliminates the need to encode empty space between slabs, which can result in a significant time reduction. Each slab is excited with a phase proportional to phase‐encode number such that the slab positions in the acquired data are shifted to reduce empty space. With careful consideration this technique is compatible with different pulse sequences (e.g., spin‐echo, gradient‐echo, RF spoiling, and balanced SSFP (bSSFP)) and acceleration strategies (e.g., partial k‐space and parallel imaging). This technique was demonstrated in phantoms and applied to bilateral breast imaging, where scan times were reduced by 20–30%. Magn Reson Med 57:798–802, 2007. © 2007 Wiley‐Liss, Inc.