The Experts below are selected from a list of 2427 Experts worldwide ranked by ideXlab platform
Cunjun Ruan - One of the best experts on this subject based on the ideXlab platform.
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A Compact, Mechanically rugged, DC Grounded 45° Slant Polarized Low Gain Ripple Omnidirectional Antenna
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019Co-Authors: Muhammad Shahzad Sadiq, Cunjun RuanAbstract:In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the Outer Conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56-2.78 GHz).
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a compact mechanically rugged dc grounded 45 slant polarized low gain ripple omnidirectional antenna
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019Co-Authors: Muhammad Shahzad Sadiq, Cunjun RuanAbstract:In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the Outer Conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56–2.78 GHz).
Wang Fu-qian - One of the best experts on this subject based on the ideXlab platform.
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The TEM Wave Distribution in a Coaxial Transmission Line with Regular-Hexagon Outer-Conductor and Circular Inner-Conductor
Optical Fiber & Electric Cable and Their Applications, 2013Co-Authors: Wang Fu-qianAbstract:The distribution of TEM wave in a coaxial transmission line with circular inner-Conductor and regular-hexagon Outer-Conductor is got by using numerical conformal mapping,the map of the EM field structure on its cross section is plotted,and its geometric size of single-mode transmission is determined from the point of view of the transmission performance.This research result will have certain reference value for the calculation of the attenuation constant of the transmission line,knowing its power capability,considering its power coupling,and designing the related active devices.
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Field Structures of the TEM Wave In a Coaxial Transmission Line with Circular-Outer-Conductor and Regular Square-inner-Conductor and Its Characteristic Impedance
Journal of Shanxi University, 2013Co-Authors: Wang Fu-qianAbstract:By using numerical conformal mapping in the complex coordinate system,the distribution of the TEM wave in a coaxial transmission line with circular-Outer-Conductor and regular-hexagon-inner-Conductor are studied,its analysis formula of structure of electromagnetic field is got,the map of structure of electromagnetic field on its cross section is plotted.Furthermore,the computational formula of the characteristic impedance is provided,the calculated values were almost equal to the values of pertinent literature,its results have much higher precision.
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The TEM Wave in Coaxial Line with Square Outer Conductor and Circular Inner Conductor and the Line's Characteristic Impedance
Optical Fiber & Electric Cable and Their Applications, 2013Co-Authors: Wang Fu-qianAbstract:On the basis of quoting the conclusions of relevant literatures,the EMF distribution regularity of TEM wave in coaxial line with square Outer Conductor and circular inner Conductor is obtained.First,the solution of the electric field is acquired with static field under the same boundary conditions,then the solution of the electric field of TEM wave is got by multiplying fluctuations factor,and then the magnetic field distribution is got based on the relationship between electric field and magnetic field according to the Maxwell's equations.By using Matlab software the map of the structure of TEM wave in the cross-section of the parallel plate-cylindrical flat line is plotted,and the line's characteristic impedance is calculated out.The research results have certain reference value for calculating the attenuation constant of the transmission line,understanding the line's power capability,considering power coupling and designing relevant active devices,etc.also has theoretical significance for studying the transmission line with arbitrary cross sections.
Muhammad Shahzad Sadiq - One of the best experts on this subject based on the ideXlab platform.
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A Compact, Mechanically rugged, DC Grounded 45° Slant Polarized Low Gain Ripple Omnidirectional Antenna
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019Co-Authors: Muhammad Shahzad Sadiq, Cunjun RuanAbstract:In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the Outer Conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56-2.78 GHz).
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a compact mechanically rugged dc grounded 45 slant polarized low gain ripple omnidirectional antenna
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019Co-Authors: Muhammad Shahzad Sadiq, Cunjun RuanAbstract:In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the Outer Conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56–2.78 GHz).
Nader Behdad - One of the best experts on this subject based on the ideXlab platform.
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A Minimally Invasive Coax-Fed Microwave Ablation Antenna With a Tapered Balun
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Hung Luyen, Susan C. Hagness, Nader BehdadAbstract:We present a minimally invasive coax-fed dipole antenna with a tapered slot balun for microwave ablation (MWA) applications. The balun is created by gradually tapering the Outer Conductor of the coaxial feed line into two parallel strips, leaving two tapered slots on the Outer Conductor. Implementing the balun within the Outer Conductor of the coax itself helps reduce the overall diameter of the antenna compared to interstitial antennas that use conventional coaxial baluns. The tapered-slot balun connects the dipole antenna comprised of three active segments to the coaxial feed line. One active segment is defined by an extension of the inner Conductor of the coaxial cable, acting as one arm of the dipole. The other two active segments are located in the two slots created by tapering the Outer Conductor and connected to its distal end to constitute the second arm of the dipole. We designed the antenna to operate at 6 GHz in ex vivo bovine liver and fabricated a prototype to conduct ablation experiments. Simulation and experiment results show that the tapered balun provides good impedance matching between the coaxial feed line and the dipole and helps the antenna achieve localized ablation zones. The proposed antenna offers a promising solution for reducing the overall diameter, and the invasiveness, of coax-fed interstitial antennas used for MWA.
Alinur Büyükaksoy - One of the best experts on this subject based on the ideXlab platform.
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Wiener-Hopf Analysis of Finite-Length Impedance Loading in the Outer Conductor of a Coaxial Waveguide
Progress In Electromagnetics Research B, 2008Co-Authors: Feray Hacivelioglu, Alinur BüyükaksoyAbstract:A new canonical scattering problem consisting of the propagation of the dominant TEM mode at the finite-length impedance discontinuity in the Outer Conductor of a coaxial waveguide is solved. The contributions from the successive impedance discontinuities are accounted for through the solution of a modified Wiener-Hopf equation. Some graphical results displaying the reflection and transmission characteristic are presented.
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Wiener-Hopf analysis of grooved coaxial waveguide
2008 12th International Conference on Mathematical Methods in Electromagnetic Theory, 2008Co-Authors: Alinur Büyükaksoy, Feray Hacivelioglu, G. UzgorenAbstract:A Wiener-Hopf analysis is provided for the propagation of the dominant TEM mode in a coaxial waveguide with a dielectric filled groove on the Outer Conductor. Some graphical results showing the effects of the groove depth and the dielectric permittivity of the material filling the groove are presented.
