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Mutual Coupling (mutual + coupling)
Selected AbstractsThe performance analyses of multitarget CMA adaptive array considering mutual coupling and diffraction effectsINTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Issue 7 2007Jin Xu Abstract The performance of a multitarget constant modulus algorithm (MU-CMA) adaptive array located on a regular conducting plate is studied in this paper. The effects of mutual coupling (MC) between array elements and diffraction caused by the conducting plate are taken into account. A hybrid method of equivalent edge current method (ECM) and moment method (MM) is employed in electromagnetic calculation to investigate the distortion of initial array pattern. We compare the capture property of three well-known MU-CMA arrays, respectively: multitarget least-squares constant modulus array (MT-LSCMA), multitarget decision-directed array (MT-DD) and least-squares despread respread multitarget constant modulus array (LS-DRMTCMA). Simulation result shows that: (i) the distorted initial pattern leads to the descending of the signal catch performance of MT-LSCMA and MT-DD; (ii) only the LS-DRMTCMA can work correctly due to its stronger anti-jamming ability in the presence of MC and diffraction. Copyright © 2006 John Wiley & Sons, Ltd. [source] Analysis and characterization of package resonanceINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2005El-Badawy El-Sharawy Abstract This article presents FDTD analysis and prediction of the overall effects of the resonance in ceramic and plastic packages. Practical structures that result in strong resonance effects are investigated, such as coupled cross lines with a via transition and multiple via transitions on a single line. A detailed study of the mutual coupling, including resonance effects, is also performed and presented. The results of the analysis indicate that the package performance can be very sensitive to the resonance effects. A broadband equivalent-circuit model for multiple transition discontinuities (two via holes) on a single line has been developed and presented. Good agreement between the frequency response of the FDTD and the circuit models has been achieved over a broad band of frequencies. The analysis presented in this article provides insight about the limits at which coupling effects on the overall package performance can be neglected. The equivalent-circuit model presented in this article can greatly simplify the analysis and simulation of a complex package, including several transition discontinuities, assuming that the coupling is small. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [source] Modeling and measurements of novel monolithic inductors and transformersINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2005Aly H. Aly Abstract This paper presents the analysis, modeling, and measurements of a novel configuration of spiral inductors and transformers to enhance the figure of merits. The present configuration utilizes a Z -shaped multilayer metalization to increase the Q of the monolithic inductors, and increase K without sacrificing the Q of the monolithic transformers. A simple two-port lumped-circuit model derived from inductor S -parameters is used to illustrate the potential of the new design. Several on-chip transformers have been fabricated using the Motorola 0.18-micron copper process. The experimental data shows good agreement with predicted data obtained using the HFSS software simulator. A noticeable increase of mutual coupling and Q is achieved. The transformer can be optimized to achieve high Q or high K or both. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [source] Compact dual-band multiple input multiple output antenna with high isolation performanceMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010Insu Yeom Abstract A compact dual-band (WLAN 11b; 2.4 GHz , 2.5 GHz, 11a; 5.15 GHz , 5.825 GHz) 2-channel Multiple Input Multiple Output (MIMO) antenna for portable media player (PMP) applications is presented. The proposed antenna is composed of a planar inverted F-shape antenna (PIFA) operating at 2 GHz band and a loop antenna operating at 5-GHz band. The antenna made up of the composite loop and PIFA antenna (CLPA) with connecting line face to the feed point and is orthogonally arranged at the edge of the ground plane for reducing mutual coupling. The antenna shows polarization and pattern diversities with excellent isolation characteristics. The two antennas were connected with each other in the bottom side to improve the isolation at 5-GHz band. The proposed antenna has a sufficient gain in WLAN service band and is compact sized for the PMP applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2808,2811, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25614 [source] CPW-fed compact slot antenna for WLAN operation in a laptop computerMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010M. Naser-Moghadasi Abstract A rectangular slot antenna fed by a coplanar waveguide is proposed for dual-band operations. The measured ,10 dB bandwidth for return loss is from 2.05 to 2.65 GHz and 5.1 to 5.4 GHz, covering all the 2.4/5.2 GHz WLAN bands. A multi-feed 12-element planar array was designed and simulated. It shows that the features of small size, uniplanar structure, good radiation characteristics, and small mutual coupling are promising for multi-input multi-output applications in laptops. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1280,1282, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25198 [source] Planar ultrawideband antenna array for short-range wireless communicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2010Osama M. H. Ahmed Abstract In this article, novel 2-element and 4-element planar ultrawideband (UWB) antenna arrays with bidirectional radiation patterns based on identical UWB antenna elements for UWB communications applications have been proposed, simulated and experimentally investigated. Each array is constructed by means of feeding omni-directional printed UWB monopole antennas with a UWB power divider. The proposed 2-element antenna array yields an impedance bandwidth of 110% (3.1,10.6 GHz) covering the whole UWB frequency bandwidth while the impedance bandwidth is multi-band in case of the 4-element antenna array because of the increasing effect of mutual coupling among antenna elements. The calculated gain of the 2-element and 4-element array is quite stable with about 3 and 6 dB higher than that of the single element, respectively. Both measured and calculated E-plane radiation patterns of the array and the single element are almost the same while the H-plane radiation patterns of the array are distinctively bidirectional compared to the omni-directional pattern of the single element. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1061,1066, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25140 [source] A compact dual-element antenna array for adaptive MIMO systemMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2009Xuan Wang Abstract A novel compact dual-element antenna array is proposed for adaptive MIMO system. By four embedded PIN diodes in the feeding network, the antenna array has three different working states. It can operate as a dual-element antenna array or work as a single antenna while the unselected antenna is terminated to a lumped matched resistor. As a dual-element antenna array, it has a ,10 dB impedance bandwidth of 595 MHz covering UMTS band with mutual coupling lower than ,15 dB in the whole band. The measured radiation patterns show that the radiation property of the selected antenna keeps steady no matter the other antenna is selected or not. The proposed antenna array can achieve antenna selection scheme to adapt to the time-varying channel conditions. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 348,351, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24044 [source] Integration of internal 700 MHz and WLAN/WiMAX antennas for palm-sized mobile devicesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008Jui-Hung Chou Abstract Two promising, internal, shorted monopole antennas for 700 MHz and WLAN/WiMAX operation are combined in an arrangement with minimized mutual coupling for palm-sized mobile applications. The two stamped, metal-plate antennas with a 2-mm gap therein between can be integrated into a compact configuration and are then mounted near one side of the system circuit board. With the suitable shorting locations and arrangement of the two antennas, good isolation (S21 < ,20 dB) between the two ports can easily be obtained. Analysis of placing a CCD shielding cylinder between the two antennas and the two shorting strips joined to form a shorting wall are also conducted. Detailed designs of the two antennas are described, and the results thereof are discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2948,2951, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23833 [source] Design of a diversity antenna with stubs for UWB applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2008Seokjin Hong Abstract A two-element diversity planar antenna for a multiple-input multiple-output application is proposed. By adopting two Y-shaped radiators, the antenna provides wideband impedance matching characteristics over the desired frequency band. To reduce the mutual coupling between two radiating elements, three stubs are inserted in the ground plane. Good impedance matching and improved isolation characteristics are observed. The measured impedance bandwidth of the proposed antenna ranges from 2.27 GHz to 10.2 GHz for a return loss of less than 10 dB. Parametric analysis has been conducted to investigate the effect of radiator length and the insertion of stubs on the impedance bandwidth and isolation characteristics. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1352,1356, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23389 [source] The high isolation dual-band inverted F antenna diversity system with the small N-section resonators on the ground planeMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2007Ki-Jin Kim Abstract The high isolated dual-band inverted-F diversity systems for portable devices, operating in 2.4 GHz band (2400,2484 MHz) and 5.2 GHz band (5150,5350 MHz), are presented. To reduce the mutual coupling and get high isolation between two internal dual-band antennas, we proposed the small N-section resonators in the form of slots on the ground plane. The optimized small size resonators for high isolation, antenna radiation efficiency, and high effective diversity are analyzed. Because of their small size, N-section resonators can be widely used in small diversity systems that require high isolation between antennas. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 731,734, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22238 [source] | ||||||||||