bluuebunny/crossref_metadata_2025_split huggingface dataset:
Miniaturized implantable broadband antenna for biotelemetry communication
Authors: Liu Wen‐Chung , Yeh Feng‐Ming , Ghavami Mohammad 
Published: June 2008

AbstractA body‐implantable miniaturized and broadband stacked antenna suitable for biotelemetry communication is proposed. By properly arranging a rectangular three‐layer slotted patch structure, the designed antenna with only 10 × 10 × 1.9 mm3 can provide a −10 dB impedance bandwidth of 50 MHz in the 402–405 MHz medical‐implant‐communication‐service frequency band. When compared with the reported most compact antenna, the proposed design achieves not only a more monopole‐like radiation pattern with a double‐radiation efficiency of 0.61% but also a size reduction of 43%. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2407–2409, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23649
An integrated 8‐mW 2.4‐GHz CMOS RF receiver for low‐power WPAN
Authors: Kwon Ickjin , Lee Minkyung 
Published: June 2008

AbstractA fully integrated 2.4‐GHz CMOS receiver IC for the low‐power wireless personal area network (WPAN) is reported. In the proposed receiver, low power operation is achieved by using low voltage linear RF front‐end circuit based on current mirror amplifier based mixer and the interleaved analog baseband filter‐amplifier chain. The fully integrated receiver was fabricated in 0.18 μm CMOS technology and IIP3 of −29 dBm and noise figure of 9.6 dB at high gain mode were obtained at 8.4 mW power consumption from a 1.2 V supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2345–2348, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23652
Experimental demonstration of narrow beam monopole antenna embedded in low effective index of refraction (n < 1) wire medium
Authors: Zhou Rongguo , Zhang Hualiang , Xin Hao 
Published: June 2008

AbstractA narrow beam monopole antenna is realized by embedding the antenna within a periodic metallic wire array. The 2D wire array is designed to have an effective index of refraction smaller than unity (neff < 1) at the X‐band frequencies (8–12 GHz), within which the antenna operates. The narrow beam effect due to the low refractive index of the wire medium is demonstrated in both simulation and experiment. Measured antenna properties including return loss and radiation pattern are in good agreement with simulation results. This simple and straightforward antenna design methodology can be applied at any microwave frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2341–2345, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23653
Angle and polarization‐independent bandstop frequency selective surface for indoor wireless systems
Authors: Kiani Ghaffer I. , Esselle Karu P. , Ford Kenneth L. , Weily Andrew R. , Panagamuwa C. 
Published: June 2008

AbstractA novel bandstop frequency selective surface (FSS) is presented. It has good frequency stability for horizontally, vertically, and circularly polarized waves, incident normally or at oblique angles. This bandstop characteristic can provide physical security to WLAN and other indoor wireless systems, whereas passing mobile/cellular phone and personal communication signals. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2315–2317, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23654
An UWB CMOS voltage‐controlled oscillator with 2–6 GHz tuning‐range using active inductor technology
Authors: Wei Chien‐Cheng , Chiu Hsien‐Chin , Yang Yi‐Tzu , Fu Jeffrey S. , Feng Wu‐Shiung 
Published: June 2008

AbstractAn ultra‐wideband voltage‐controlled oscillator (VCO) in a standard 0.18‐μm CMOS process is presented in this article. The designed VCO adopts two active inductors to replace the passive spiral inductors; this results in an increase in tuning‐range and chip area reduction. The active inductor provides a variable inductance range from 1.7 to 3.6 nH, so that the output frequencies of the novel VCO can be obtained from 2 to 6 GHz, with a tuning‐range of around 100%. According to the experimental result, it indicates that the proposed design exhibits a significant wide tuning‐range and compact chip size compared with a standard VCO with passive inductors. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2311–2315, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23655
Taking advantage of a dual‐gate FET resistive mixer for ASK remodulation in a phase conjugating antenna
Authors: Aballo T. , Cabria L. , García J. A. , Marante F. R. 
Published: June 2008

AbstractIn this letter, the use of a dual‐gate FET resistive mixer in a phase conjugating antenna is proposed. Applying a pulsed data signal to the second gate terminal, the amplitude of the time‐varying output conductance can be controlled. By means of an appropriate integration of the mixer with an aperture coupled patch, an amplitude shift keying modulation of the phase‐reversed signal is achieved. The capability of the proposed solution for retransmitting information back to the interrogation position is finally proved through measurements in a backscatter test setup. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2283–2287, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23656
Novel planar tapered‐slot‐fed UWB antenna
Authors: Yao Yuan , Chen Wenhua , Huang Bin , Feng Zhenghe 
Published: June 2008

AbstractA planar tapered‐slot‐fed antenna is proposed in this article. The antenna is printed on a dielectric substrate. Measured and simulated results are used to demonstrate the performance of the antenna. It can be seen that this type of antenna is suitable for ultra‐wideband (UWB) applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2280–2283, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23657
Circularly polarized stacked antenna with a high‐impedance ground plane for RFID reader applications
Authors: Sun Jwo‐Shiun , Lee Yi‐Chieh 
Published: June 2008

AbstractA circularly polarized (CP) stacked antenna for the long range reader of a RFID is studied. The proposed CP antenna using stacked patch technique with a high‐impedance ground plane exhibits fairly good performances of 30 MHz bandwidth for 3 dB axial ratio, 70 MHz bandwidth referred to 10 dB return loss at the center frequency of 915 MHz. The gain of the designed antenna is more than 7 dBi over 902–928 MHz and 922–928 MHz and the reading range of the reader reaches 5.5 m. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2248–2250, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23658
Six‐band internal antenna for small‐size mobile phone
Authors: Li Wei‐Yu , Wong Kin‐Lu 
Published: June 2008

AbstractA promising six‐band internal antenna suitable for small‐size mobile phone application is presented. The mobile phone considered in this study has a system ground plane of length 60 mm only, much less than that of the general mobile phones. For such small‐size mobile phones, it is not easy for the embedded antenna to achieve a wide operating band at 900 MHz for GSM850/900 operation. The proposed antenna solved the problem with a reasonable occupied volume. The antenna mainly comprises three radiating elements of two longer monopoles and a shorter monopole, which are configured to occupy a volume of 3.6 cm3 only. The two longer monopoles incorporating an external parallel chip inductor lead to the successful excitation of a wide operating band for the antenna's lower band to cover GSM850/900 operation. Moreover, the three monopoles together contribute to the excitation of a very wide upper band to cover GSM1800/1900/UMTS/WLAN operation. That is, the antenna can perform six‐band operation for WWAN and WLAN communications. The proposed antenna is studied in detail in this article. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2242–2247, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23659
Performance analysis of parallel FDTD method on the different platforms
Authors: Yu Wenhua , Liu Yongjun , Yang Xiaoling , Mittra Raj , Lu Yongquan , Wang Pai , Che Qing , Lu Rui 
Published: June 2008

AbstractIn this communication, we investigate the performance of parallel FDTD code on a Gigabit Ethernet and optical network. It is fact that the optical network is necessary for a large cluster due to its wide bandwidth and small latency. However, for a small cluster, the Gigabit Ethernet will have a better ratio of performance to price. We also investigate the difference between high performance server and regular PC for the parallel FDTD code. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2465–2467, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23661
A multilayered triplexer with low‐temperature cofired ceramic technology
Authors: Tang Ching‐Wen , Hsu Huan‐Chang 
Published: June 2008

AbstractA multilayered triplexer is proposed in this article. The ordered of this proposed triplexer can be reduced by inserting a transmission zero, which can also enhance the isolation between two separate passbands. Lowpass and highpass filters, which can make a diplexer due to their complementary characteristics, are utilized to reduce the insertion loss of the proposed triplexer. Moreover, the low‐temperature cofired ceramic technology can miniaturize the size of the triplexer. The procedures of circuit design are provided in this article as well. Excellent agreement between measurement and simulation validates the feasibility of the proposed configuration. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2399–2403, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23663
Broadband digital phase shifter based on composite right/left‐handed transmission line
Authors: An Jian , Wang Guang‐Ming , Zhang Chen‐Xin , Qu Shao‐Bo , Zhang Peng 
Published: June 2008

AbstractThe broadband digital phase shifters are valuable for the modern phase array antennas. Under balanced condition, composite right/left‐handed transmission line (CRLH TL) is broadband because of its unique hyperbolic‐linear dispersion relations. A broadband 4‐bit digital phase shifter based on the broadband property of CRLH TL is designed. When the absolute error is less than ±5°, for the 180° stage of the phase shifter, the relative bandwidth achieves 31.3%, while the conventional 180° switched line phase shifter only achieves 8.9%. And the unique hyperbolic‐linear dispersion relations are also able to minimize the area of the phase shifter. A simple circuit to test the right‐handed (RH) effect of the left‐handed (LH) TL is fabricated and used successfully in the design process of the 4‐bit digital phase shifter. The simulation and experiment results show that the design method of the phase shifter is feasible. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2365–2368, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23665
An integrated 24‐GHz differential VCO using SiGe HBT technology
Authors: Hamed Karim W. , Freundorfer Alois P. , Antar Yahia M. M. 
Published: June 2008

AbstractThis letter presents the design and performance characteristics of an integrated 24‐GHz differential voltage‐controlled oscillator (VCO). The developed VCO was implemented monolithically using the IBM BICMOS5HP process. Oscillator measured results show a tuning range of 1 GHz from 24.6 to 23.6 GHz with less than 1 dB variation in the differential output power over the entire tuning range. The fabricated VCO also exhibits a measured phase noise of −105 dBc/Hz at 1 MHz off the carrier. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2322–2325, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23666
Accurate integration of segmented 3D profile measurements using digital 2D fringe projection
Authors: Su Wei‐Hung , Hsu Yi‐Ling , Yu Kun‐Chang , Liu Hongyu 
Published: June 2008

AbstractAn improved integration approach for segmented 3D shapes using projected digitalized 2D pattern is presented. The digital 2D patterns are fabricated based on lithography techniques. Geometrical accuracy better than 0.5 μm can be achieved. Contrast ratio of the fringe pattern can be precisely controlled as well. With this pattern, integrated accuracy better than one part in one hundredth of the pixel size can be achieved. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2474–2480, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23667
Double‐printed rectangular patch dipole antenna for UWB applications
Authors: Gao Guo‐Ping , Yang Xue‐Xia , Zhang Jin‐Sheng , Xiao Jin‐Xiang , Wang Fa‐Jia 
Published: June 2008

AbstractA novel double‐printed rectangular patch dipole antenna suitable for UWB application is presented and investigated in this article. The effects of some important antenna parameters on the return loss of the proposed antenna have been investigated. Printed on the dielectric substrate and fed by a microstrip line, the antenna has been demonstrated to provide an UWB with return loss less than −10 dB from 3.1 to 10.6 GHz and the satisfactory radiation properties. A gain variation from 4.78 to 7.89 dB is obtained. The transfer function has flat magnitude and linear phase with smooth group delay being gained, which is advantageous to the transmission of the UWB signals. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2450–2452, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23668
Simple adaptive first‐order PMD compensator using a Faraday rotator and a variable DGD element
Authors: Pan Shilong , Wang Jiajun , Lou Caiyun , Yang Yanfu , Dai Wuju 
Published: June 2008

AbstractA two‐degree‐of‐freedom (DOF) polarization mode dispersion (PMD) compensator has been developed to cancel the effects of first‐order PMD. The compensator comprises of a Faraday rotator (FR) and a dynamically varying crystal differential‐group‐delay (DGD) element. Because of the reduced number of control parameters, the compensator potentially possesses the desirable features of simple control, fast response, and cost saving. Principle of operation is validated by theoretical analysis and successful automatic PMD compensation is achieved in a 40 Gbit/s nonreturn‐to‐zero (NRZ) system. The compensator increased the average DGD allowed from less than 23% per bit‐slot for the uncompensated case to 42% at an outage probability of 10−4. Fast response of the compensator is also observed. The optimum setting of the compensator can be found in about 10 nregulating steps for all PMD emulator (PMDE) setting. These features allow the effective mitigation of the first‐order PMD effects within an optical fiber channel. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2417–2420, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23669
Cad of stacked patch antennas through multipurpose admittance matrices from FEM and neural networks
Authors: Córcoles Juan , González Miguel A. , Zapata Juan 
Published: June 2008

AbstractIn this work, a novel computer‐aided design methodology for probe‐fed, cavity‐backed, stacked microstrip patch antennas is proposed. The methodology incorporates the rigor of a numerical technique, such as finite element methods, which, in turn, makes use of a newly developed procedure (multipurpose admittance matrices) to carry out a full‐wave analysis in a given structure in spite of certain physical shapes and dimensions not yet being established. With the aid of this technique, we form a training set for a neural network, whose output is the desired response of the antenna according to the value of design parameters. Last, taking advantage of this neural network, we perform a global optimization through a genetic algorithm or simulated annealing to obtain a final design. The proposed methodology is validated through a real design whose numerical results are compared with measurements with good agreement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2411–2416, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23670
Lumped element equivalent circuit for the cymbal resonator bandpass filter
Authors: Kelly James R. , Seager Rob D. , Wong Thomas 
Published: June 2008

AbstractThis article presents an equivalent circuit for the microstrip cymbal bandpass filter (Strassner and Chang, Microwave Opt Technol Lett 28 (2001), 33–34; Strassner and Chang, IEEE Trans Microwave Theory Techn 50 (2002), 1431–1432), together with an ABCD matrix. The circuit models the frequency response of the filter accurately. A set of polynomial equations were also developed as a design aid. These equations give the equivalent circuit component values. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2381–2384, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23671
A novel implementation of composite right/left‐handed transmission line
Authors: Ma Jia‐Jun , Cao Xiang‐Yu , Liu Tao 
Published: June 2008

AbstractA novel composite right/left‐handed transmission line is presented in this letter. The proposed CRLH structure can be considered as a CPW version composed with a pair of parallel spiral interdigital and a conjunctive stub. The spiral interdigital enlarges the series capacitance, and the adjustable conjunctive stub increases the shunt inductance. So, this structure is simpler and more compact compared with the conventional one. Its left‐handed material property is confirmed by simulation and measurement results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2379–2381, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23672
Resonant frequency of asymmetrically loaded annular microstrip antenna
Authors: Mahajan Madhurika , Khah Sunil Kumar , Chakarvarty T. , De A. 
Published: June 2008

AbstractTheory of resonant frequency of an annular ring antenna with asymmetric multiple shorting posts is presented using modified Cavity Model. The posts are thin in diameter with respect to the diameter of ring. For accurate formulation, the shorting posts have been considered as inductive impedances at the frequency of interest. It is shown that for asymmetric loaded ring, TM11 is the dominant mode. The simple tool presented can be suitably modified to incorporate switching diodes or varactor diodes. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2351–2353, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23673
Reconfigurable patch antenna with switchable L‐shaped slots for circular polarization diversity
Authors: Raghavan S. , Shanmuganantham T. , Kishore Kumar M. S. 
Published: June 2008

AbstractA novel design of a microstrip patch antenna incorporated by two orthogonal L‐shaped switchable slots is proposed to achieve circular polarization. Two pin diodes are inserted into these L‐shaped slots and by making these two pin diodes ON and OFF the antenna can radiate with either right handed circular polarization or left handed circular polarization with wide bandwidth. This antenna can be used in unlicensed & licensed WiMAX (IEEE802.16a), future planetary missions and satellite link. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2348–2350, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23674
A miniaturized parallel‐coupled microstrip filter using over‐coupled end stages with symmetrical tapped‐line structure
Authors: Lin Kun‐Ying , Liao Shry‐Sann 
Published: June 2008

AbstractIn this article, a miniaturized parallel‐coupled microstrip filter is presented. The miniaturized design saves 80% circuit dimension compared to the conventional parallel‐coupled over‐coupled end stages filter with the symmetrical tapped‐line structure. Several design methods and miniaturization techniques were involved in this study to achieve 5f0 stopband suppression, including symmetrical tapped‐line, stepped‐impedance structure, bended and folded of transmission lines, and the coupling effect of microstrip‐lines. Also the asymmetrical tapped‐line structure is fabricated to achieve 6f0 stopband suppression. Good agreements between the simulated and measured results were also observed in all above cases. Furthermore, no lumped elements, via‐holes, and bonding wires are necessary for this miniaturized coupler, making it very useful for the modern wireless communication systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2271–2274, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23675
Left‐handed lumped transmission lines and left‐handed small impedance transformers
Authors: Hee‐Ran Ahn , Bumman Kim 
Published: June 2008

AbstractBased on the concept that a left‐handed transmission line section has a negative electrical length, two Π‐type lumped equivalent circuits are presented, and it is newly suggested that a low‐pass filter type can be its lumped‐equivalent circuit under a certain condition. Applying the negative electrical length concept to Smith chart, left‐handed small impedance transformers are derived and two are validated by measurements, adding 180° right‐handed transmission lines to the impedance transformers. The measured results are in good agreements with predictions, showing that insertion and return losses are −0.23 and −22.5 dB, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2269–2271, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23676
GSM open‐loop duplexer filter with internal stubs
Authors: Bezerra A. L. , de Souza M. F. A. , e Silva F. R. L. , de Oliveira B. G. M. , de Melo M. T. 
Published: June 2008

AbstractA duplexer filter with open‐loop resonators, having internal stubs, for the GSM band in the DSC1800 Cellular Radio Base Station standard is presented. The filters use square open‐loop resonators. Insertion of the stubs allows the perimeter of the loop to be less than λ/2, which is the length used in the canonical loop. The device was fabricated on PTFE (RO3010) board. An eight‐pole selective filter with a single pair of attenuation poles was used. A full‐wave EM simulator was used to obtain the dimensions of the resonators. The measurement results are presented in comparison with the expected simulated values. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2422–2426, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23677
A high‐efficiency inverse class‐F power amplifier using GaN HEMT
Authors: Kim Hyoungjong , Choi Gilwong , Choi Jinjoo 
Published: June 2008

AbstractThe design and fabrication of a high‐efficiency inverse class‐F power amplifier using a 10‐W gallium nitride (GaN) high‐electron mobility transistor at 1 GHz is presented. The output load network has been used to control harmonic components for high‐efficiency operation. The measurement results show that power‐added efficiency of 74.2%, drain efficiency of 77.5%, and gain of 13.7 dB at an output power of 39.8 dBm for a continuous wave signal. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2420–2422, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23678