bluuebunny/crossref_metadata_2025_split huggingface dataset:
DOP‐tunable semiconductor fiber ring laser
Authors: Fang Nian , Wang Lu‐Tang , Huang Zhao‐Ming 
Published: April 2009

AbstractA novel laser with tunable and stable degree of polarization (DOP) is introduced. It consists of a polarization beam splitter (PBS) and a bidirectional semiconductor fiber ring, which is composed of a semiconductor optical amplifier (SOA), a polarization controller (PC) and a 2 × 2 wideband fiber coupler. By adjusting the PC or the injected current of the SOA, the time averaged DOP of the laser output varies optionally from 0.16 to 99%. Employing the bidirectional ring structure and PBS polarization combination method, DOP of the laser can be kept stable at any level in that range. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1669–1671, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24403
Ultra‐wideband bandpass filter using half‐mode T‐septum substrate integrated waveguide with electromagnetic bandgap structures
Authors: Wu Lin‐Sheng , Zhou Xi‐Lang , Yin Wen‐Yan 
Published: April 2009

AbstractA novel ultra‐wideband (UWB) bandpass filter (BPF) is presented using a half‐mode T‐septum substrate integrated waveguide combined with electromagnetic bandgap structures. When compared with conventional substrate integrated waveguide filters, its width is very small and can work in monomode over the UWB frequency range. The filter performance is demonstrated by our measured S‐parameters and group delay, which agree with the simulated results very well. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1751–1755, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24404
Novel complementary split ring resonantor DGS for low‐pass filter design
Authors: Chen XiaoQun , Weng LiHong , Shi Xiaowei 
Published: April 2009

AbstractThis article has investigated a novel complementary split‐ring resonator (CSRR) defected ground structure (DGS) theoretically and experimentally. The proposed CSRR DGS provides excellent performances including double resonant property, ripple in the passband, sharp selectivity at the cut‐off frequency, and spurious free wide stopband. The equivalent circuit model of the CSRR is also presented. Low‐pass filters using DGS units are fabricated to obtain wide reject band. The measured results show a good agreement with the theoretical analysis. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1748–1751, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24405
Wideband circularly polarized cavity‐backed crossed loop antenna
Authors: Qu Shi‐Wei , Chan Chi Hou , Xue Quan 
Published: April 2009

AbstractA circularly polarized cavity‐backed crossed loop antenna is proposed in this article. The optimized overall dimensions of the antenna are 1.13λo in diameter and 0.267λo in height (λo is the free‐space wavelength at the center frequency), and the circumference of one loop is 1.1λo. Measurements show that the proposed antenna features an 81% impedance bandwidth for SWR ≤2, a 40% bandwidth for axial ratio ≤3 dB, an average gain of 10 dBi, and stable radiation patterns over the whole band from 1.42 to 2.13 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1714–1718, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24406
Hollow core photonic band gap fiber for THz applications
Authors: Vincetti Luca 
Published: April 2009

AbstractIn this article, a hollow core photonic band gap fiber is numerically investigated to obtain low‐loss waveguiding in the terahertz region (0.1–10 THz) of the electromagnetic spectrum. Waveguide design in this spectral region is an arduous challenge due to the high‐conductivity losses of metals and high‐absorption of the dielectrics. Numerical results show the possibility to reach propagation loss two decades lower than the bulk absorption losses of the material used to fabricate the fiber, and low dispersion over a wide range of wavelength. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1711–1714, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24407
Millimeter‐wave signal generation utilizing optical‐phase modulation and Brillouin spectral lines suppression
Authors: Jiang Yang , Yu Jinlong , Han Bingcheng , Zhang Li , Zhang Litai , Wang Wenrui , Yang Enze 
Published: April 2009

AbstractA novel photonic technique to generate millimeter‐wave signal is presented. By utilizing an optical phase modulator driven by a 10 GHz electrical signal, high‐order modulation sidebands are generated on an optical carrier. In addition, a multiwavelength Brillouin fiber laser (BFL) configuration, acted as multitap notch filter, is used to eliminate unwanted modulation sidebands and keep desired harmonic components. Unlike conventional Brillouin selective sideband amplification or other filtering technology, this technique require neither more external light sources to provide Stokes waves nor wavelength matching between light source and filters. The output of the system is dominated by two high‐order sidebands in the optical domain, separated by desired harmonic of the modulation frequency. Signal multiplication is simulated and experimentally demonstrated. The operation range is only limited by the amount of phase shift achieved in the phase modulator. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1683–1685, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24408
Design of time delay lines with periodic microstrip line and composite right/left‐handed transmission line
Authors: Zhang Jun , Zhu Qi , Jiang Qi , Xu Shanjia 
Published: April 2009

AbstractTime delay lines based on periodic microstrip lines (PMLs) and composite right/left‐handed transmission lines (CRLH‐TLs) are proposed. Compared with ordinary microstrip lines, PMLs are more suitable to realize tiny time delays because of their slow‐wave characteristics. Meanwhile, CRLH‐TLs are chosen to realize large time delays due to their large and easy designable phase constant. Finally, a 9‐bit time delay module is designed and fabricated as an example. It is shown that the present time delay module possesses the advantages of compactness, low‐loss, precise, and easy fabrication. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1679–1682, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24409
Dual‐band bandpass filter based on a hole resonator
Authors: Girbau D. , Lázaro A. , Pérez A. , Pradell L. 
Published: April 2009

AbstractThis article proposes a new dual‐band microstrip resonator, addressed as hole resonator, to be integrated in dual‐band bandpass filters. The main advantage of this structure is that it can be easily coupled in parallel to other resonators since its profile is constant, in contrast with nonconstant profile resonators, such as the stepped‐impedance resonator. Thus, the design process is simpler and less time‐consuming. The hole resonator is characterized by theoretical analysis and validated through electromagnetic simulation and measurements. Finally it is integrated in a bandpass filter to demonstrate its suitability. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1649–1652, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24410
A waveguide cavity 180° hybrid coupler with coaxial ports
Authors: Navarrini Alessandro , Pisanu Tonino , Nesti Renzo 
Published: April 2009

AbstractWe describe the design, construction, and performance of a 180° hybrid coupler for the frequency band 1.3–1.8 GHz (L‐band). The hybrid utilizes a WR650 rectangular waveguide cavity and has three 50 Ω coaxial ports. The signals are coupled in and out of the cavity through broadband coaxial probes attached to 7/16‐type connectors. The measured performances are in excellent agreement with the electromagnetic simulations. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1646–1649, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24411
Substrate‐integrated‐waveguide feed network for microstrip antenna arrays
Authors: Yousefbeigi Mohsen , Shahabadi Mahmoud 
Published: April 2009

AbstractIn this article, a low‐loss parallel‐series feed structure using substrate integrated waveguide (SIW) technology for a single‐layer microstrip antenna array is presented. In addition to reduction of feed radiation, the feed network benefits from typical advantages of planar structures such as compactness, low cost, integrability, and mass‐producibility. A 2 × 8 microstrip antenna array of size 109 mm × 34 mm fed by the proposed SIW feed system is designed and fabricated. Measurements on the fabricated array verify a minimum gain of 17.5 dBi in the frequency range of 17.4 to 18 GHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1619–1621, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24412
Terahertz generation and detection setup based on pump‐probe scheme
Authors: Zhou Zhen , Chen An‐Tao , Feng Li‐Shuang , Xin Xiang‐Jun , Yu Chong‐Xiu 
Published: April 2009

AbstractA terahertz (THz) generation and detection setup based on pump‐probe scheme is presented. THz pulses are generated and detected successfully using nonlinear optical rectification of high power femtosecond laser pulses and electro‐optic sampling. 3 THz available spectrum range is obtained for the setup. The use of THz pulses for spectroscopy is tested by measuring the absorption spectrums of water in air and dry nitrogen, respectively. The measurement results show the setup has a high potential of THz spectroscopy. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1617–1619, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24413
Bandwidth enhancement of multiband handset antennas by opening a slot on mobile chassis
Authors: Zhang Xingyu , Zhao Anping 
Published: April 2009

AbstractTo overcome the shortcoming of narrow bandwidth for traditional planar inverted‐F antenna (PIFA), a novel bandwidth enhancement technique for internal multiband mobile handset antennas is proposed in this article. In particular, a rectangular slot with an appropriate location and a proper size is introduced into the ground plane of the system printed circuit board to improve the bandwidths of handset antennas in both the low‐ (GSM850 and GSM900) and high‐ (DCS1800 and PCS1900) bands. A prototype that can cover the frequency bands of GSM850, GSM900, DCS1800, and PCS1900 simultaneously was fabricated and measured. Good agreement between the measurement and simulation results is achieved. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1702–1706, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24414
A small printed dual‐band antenna for mobile phones
Authors: Kim Jae Hee , Cho Won Woo , Park Wee Sang 
Published: April 2009

AbstractA small printed antenna is proposed for dual‐band applications. The antenna is patterned on the front of an 0.8‐mm FR4 substrate to obtain a low‐frequency resonance and a stub is patterned on the back of the substrate to obtain a high‐frequency resonance. The antenna without ground plane is small (8 × 35 mm), and it is suitable to operate as an internal antenna. For S11 less than −6 dB, the antenna operates at 900 MHz with a bandwidth of 66 MHz, and at 1.8 GHz with a bandwidth of 130 MHz. Maximum radiation efficiencies were 52% at both 900 MHz and 1805 MHz. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1699–1702, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24415
On the sources reconstruction method application for array and aperture antennas diagnostics
Authors: Las‐Heras Fernando , Galocha Belén , Alvarez Yuri 
Published: April 2009

AbstractThis article presents two practical applications of the Sources Reconstruction Method for antenna diagnostics and antenna manufacturing errors detection. The goal is to show the SRM capabilities to determine defective elements in antenna arrays as well as to detect irregularities in the surface of reflector antennas from the analysis of the aperture fields. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1664–1668, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24416
Compact multilayer dual‐band filter using slot coupled stepped‐impedance‐resonators structure
Authors: Djaiz A. , Nedil M. , Habib A. M. , Denidni T. A. 
Published: April 2009

AbstractIn this article, a new miniaturized configuration of single‐input‐single‐output dual‐band bandpass filter operating at ISM 2.45 GHz and UNII 5.8 GHz frequency bands using a multilayer structure with stepped‐impedance resonators is presented. A coupling aperture is introduced in a common ground to ensure the coupling between the two resonators located in the upper layer and the lower one. The use of stepped‐impedance resonators allows tuning the two bands at desired frequencies. Finally, a design prototype was fabricated to validate the proposed concept. The insertion loss and return loss at the central frequency are −1.35 dB and −17 dB for 2.45 GHz band, and −0.98 dB and −13 dB for the 5.8 GHz band, respectively. There is a good agreement between experimental and full‐wave electromagnetic simulation results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1635–1638, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24417
In‐line fiber‐optical polarizer with high‐extinction ratios and low‐insertion loss
Authors: Wang Xinyue , Chaojun Wu , Wang Ziyu 
Published: April 2009

AbstractThis letter demonstrated a novel strategy to optimize the extinction ratio and the insertion loss of side‐polished fiber‐optical polarizers. The polarizer has a portion of the cladding polished away and replaced with only a single layer of thin aluminium film. Extinction ratios up to over 22.6 dB/cm and the insertion loss down to 1–2 dB/cm have been realized. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1763–1765, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24418
An experimental investigation of a novel dual‐wavelength single‐longitudinal‐mode fiber laser
Authors: Zhou Yating , Liu Shenchun , Tu Xinghua , Yin Zuowei , Chen Xiangfei 
Published: April 2009

AbstractA novel continuous‐wave fiber laser is proposed and experimentally studied. Due to its unique configuration, the output of the fiber laser is dual‐wavelength single‐longitude‐mode under relative low‐gain. The wavelength spacing between the two wavelengths can be tunable slightly, which will benefit some applications of the laser. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1760–1763, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24419
Propagation delay matched CMOS 0.18 μm frequency doubler for L‐band application
Authors: Choi Heungjae , Song Kyungju , Jeong Yongchae , Kenney J. S. , Kim Chul Dong 
Published: April 2009

AbstractIn this article, propagation delay matched CMOS frequency doubler for L‐band application is proposed. Schmitt trigger and voltage controlled delay line compensates duty cycle error and propagation delay mismatching that are induced as the frequency of operation is increased. As a consequence, unwanted harmonic components suppression is greatly improved for higher frequency of operation. CMOS frequency doubler is designed at the input fundamental frequency (f0) of 1.15 GHz and fabricated with TSMC 0.18 μm CMOS process. Measured output power at the doubled frequency (2f0) is 2.67 dBm for the input power of 0 dBm. The amount of harmonic suppression for f0, 3f0, and 4f0are 43.65, 38.65, and 35.59 dB, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1729–1732, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24420
Realization of dual‐dipole‐antenna system for concurrent dual‐radio operation using polarization diversity
Authors: Su Saou‐Wen , Chou Jui‐Hung , Liu Yung‐Tao 
Published: April 2009

AbstractThe study of the mutual coupling between the two simple strip dipole antennas is first carried out and investigated. The results show that the coupling or the antenna port isolation is almost separation distance independent when the two dipole antennas are arranged to be of orthogonal polarization. Following this characteristic, a novel dual‐dipole‐antenna system aimed for concurrent 2.4 and 5 GHz band operation and at the same time, to achieve very compact integration of two individual antennas with separate feeds is proposed. The two dipole antennas are etched on a two‐layered dielectric substrate with dimensions 30 mm × 30 mm. On the front layer is put the 2.4 GHz dipole, which is perpendicular to the 5 GHz dipole located on the bottom layer. Though the two dipoles are stacked up with a distance of 0.8 mm only, port isolation can still be below −15 dB. The proposed dual‐dipole‐antenna system is a promising candidate for the antenna solution that enables simultaneous dual‐radio operation. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1725–1729, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24421
A high‐SFDR direct digital frequency synthesizer with embedded error‐compensation CMOS OTP ROM for wireless receivers
Authors: Huang Chi‐Chun , Jhuang Guo‐Lin , Wang Chua‐Chin 
Published: April 2009

AbstractA direct digital frequency synthesizer (DDFS) using on‐chip CMOS one‐time programmable read‐only memory (OTP ROM) is presented. A straight‐line approximation algorithm for sinusoid with compensation is adopted such that the accuracy could be maintained and the cost is reduced. Most important of all, a CMOS OTP ROM is used as a look‐up ROM table, which is implemented by a typical logic CMOS process. Therefore, the proposed DDFS can be integrated in any CMOS‐based front‐end circuit for wireless communication systems. The proposed DDFS design is fully implemented using a typical 1P6M 0.18 μm CMOS process. It has a 12‐bit amplitude resolution with 86.89 dB spurious free dynamic range using a small ROM size of 256 bits. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1695–1699, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24422
Broadband patch antenna design using differential evolution algorithm
Authors: Zhang Li , Cui Zhen , Jiao Yong‐Chang , Zhang Fu‐Shun 
Published: April 2009

AbstractA novel evolutionary algorithm for broadband patch antenna design is presented. The differential evolution algorithm (DE) and the method of moments (MOM) are combined to achieve the optimum antenna satisfying a certain design criterion. The antenna geometric parameters are extracted to be optimized by DE, and a fitness function is evaluated by MOM simulations to represent the performance of each candidate design. A broadband patch antenna is designed using the optimizer. The optimized patch antenna is fabricated and measured to validate the robustness of the algorithm. The measured 38.6% bandwidth exhibits the prospect of the DE/MOM algorithm in practical patch antenna design. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1692–1695, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24423
A novel compact ultrawideband (UWB) bandpass filter using multiple‐mode resonator
Authors: Chen D. , Huang X. D. , Cheng C. H. 
Published: April 2009

AbstractIn this letter, a novel compact ultrawideband (UWB) bandpasss filter (BPF) using the proposed multiple‐mode resonator (MMR) is presented. The MMR is composed of a conventional microstrip hairpin resonator of which the two arms are connected by a section of microstrip line and a short‐circuited point located in the middle of the hairpin resonator. Its first three resonant modes can be utilized to construct the UWB band. The tapped feeding structure has been used to realize desired tight couplings for designing the UWB BPF. The filter has been investigated numerically and experimentally. Both the simulated and measured results show that the filter has good performance, such as compact size, low‐insertion loss, small group delay variation, and improved out‐of‐band performances. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1662–1664, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24424
Material dispersion interplay with spectral filtering on plastic optical fiber (POF) links
Authors: Ribeiro Ricardo M. , Silva Vinicius N. H. , Barbero Andrés P. L. 
Published: April 2009

AbstractThis article reports on the material dispersion interplay with spectral filtering that shifts the bandwidth of Poly‐Methyl‐Metacrylate plastic optical fiber links. Calculations were carried out on fiber lengths up to 500 m and 100 m in length for <600 and 650 nm visible wavelength channels, respectively. The rise time budget evaluation is improved. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1657–1662, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24425
Miniature 60‐GHz‐band bandpass filter with 2.55‐dB insertion‐loss using standard 0.13 μm CMOS technology
Authors: Lu Mei‐Ching , Chang Jin‐Fa , Lu Li‐Chun , Lin Yo‐Sheng 
Published: April 2009

AbstractIn this article, we demonstrate a miniature low‐insertion‐loss 60‐GHz‐band bandpass filter by standard 0.13 μm CMOS technology. Low‐insertion‐loss is achieved by adopting thick microstrip‐line (MSL) with optimized ground‐plane pattern as the needed inductors to minimize the metal and substrate loss. This filter achieved insertion‐loss (1/S21) lower than 3 dB over the frequency range of 56.9–68.6 GHz, input return loss (S11) better than −10 dB over the frequency range of 53.4–71.9 GHz, and output return loss (S22) better than −10 dB over the frequency range of 53.2–70.9 GHz. The minimum insertion‐loss was 2.55 dB at 62.5 GHz. To the authors' knowledge, this is the best result ever reported for a 60‐GHz‐band CMOS bandpass filter in the literature. The chip area was only 0.175 × 0.194 mm2, i.e. 0.034 mm2, excluding the test pads. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1632–1635, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24426
Broadband cloaking with volumetric structures composed of two‐dimensional transmission‐line networks
Authors: Alitalo Pekka , Luukkonen Olli , Mosig Juan R. , Tretyakov Sergei A. 
Published: April 2009

AbstractThe cloaking performance of two microwave cloaks, both based on the recently proposed transmission‐line approach, are studied using commercial full‐wave simulation software. The cloaks are shown to be able to reduce the total scattering cross sections of metallic objects of some restricted shapes and sizes. One of the studied cloaks is electrically small in diameter, and the other is electrically large, with the diameter equal to several wavelengths. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1627–1631, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24427