The Experts below are selected from a list of 4914 Experts worldwide ranked by ideXlab platform
Evelyne Clavelier - One of the best experts on this subject based on the ideXlab platform.
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A Typology of Antenna Tuner Control Schemes, for One or More Antennas
Excem Research Papers in Electronics and Electromagnetics, 2020Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:We identify five types of Antenna tuner control scheme, which are suitable for a wireless transmitter using a single Antenna. Four of them use a sensing unit measuring electrical variables either at the radio Port or at the Antenna Port of the Antenna tuner. We also define and discuss four types of Antenna tuner control scheme which are relevant to a transmitter utilizing several Antennas for MIMO radio transmission. The accuracy and other characteristics of the different schemes are discussed and compared.
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Two multiple-Antenna-Port and multiple-user-Port Antenna tuners
2015Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:Two multiple-Antenna-Port and multiple-user-Port Antenna tuners are studied and compared. The first one is made up of independent and uncoupled single-Antenna-Port and single-user-Port Antenna tuners, each having the structure of a π-network. The second one is new. It cannot be separated into independent and uncoupled Antenna tuners and it has the structure of a multidimensional π-network. It is shown that, unlike fixed matching and/or decoupling networks and unlike the first Antenna tuner, the new Antenna tuner is able to provide an ideal match at any frequency in a frequency band of intended operation.
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RWS - A new multiple-Antenna-Port and multiple-user-Port Antenna tuner
2015 IEEE Radio and Wireless Symposium (RWS), 2015Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:A new multiple-Antenna-Port and multiple-user-Port Antenna tuner has the structure of a multidimensional π-network. It is shown that it is able to provide decoupling and matching in the presence of strong variations in the electromagnetic characteristics of the volume surrounding the Antennas.
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Some Properties of Multiple-Antenna-Port and Multiple-User-Port Antenna Tuners
IEEE Transactions on Circuits and Systems I: Regular Papers, 2015Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:A user Port impedance range and a user Port tuning range characterize an Antenna tuner at a given frequency. These sets and their local dimensions are defined and studied for an Antenna tuner having any number $n$ of Antenna Ports and any number $m$ of user Ports. A reciprocal Antenna tuner is said to have a full tuning capability if it can provide or compensate all relevant small impedance variations, under the assumption that its adjustable impedance devices can provide suitable reactance values. For reciprocal Antennas and a reciprocal Antenna tuner, it is proven that the local dimension of the user Port impedance range is equal to $m(m+1)$ if and only if the Antenna tuner has a full tuning capability. We use this result to study an Antenna tuner made of several uncoupled single-Antenna-Port and single-user-Port Antenna tuners. We also use this result to show that a new multiple-Antenna-Port and multiple-user-Port Antenna tuner has a full tuning capability.
Frédéric Broydé - One of the best experts on this subject based on the ideXlab platform.
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A Typology of Antenna Tuner Control Schemes, for One or More Antennas
Excem Research Papers in Electronics and Electromagnetics, 2020Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:We identify five types of Antenna tuner control scheme, which are suitable for a wireless transmitter using a single Antenna. Four of them use a sensing unit measuring electrical variables either at the radio Port or at the Antenna Port of the Antenna tuner. We also define and discuss four types of Antenna tuner control scheme which are relevant to a transmitter utilizing several Antennas for MIMO radio transmission. The accuracy and other characteristics of the different schemes are discussed and compared.
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Two multiple-Antenna-Port and multiple-user-Port Antenna tuners
2015Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:Two multiple-Antenna-Port and multiple-user-Port Antenna tuners are studied and compared. The first one is made up of independent and uncoupled single-Antenna-Port and single-user-Port Antenna tuners, each having the structure of a π-network. The second one is new. It cannot be separated into independent and uncoupled Antenna tuners and it has the structure of a multidimensional π-network. It is shown that, unlike fixed matching and/or decoupling networks and unlike the first Antenna tuner, the new Antenna tuner is able to provide an ideal match at any frequency in a frequency band of intended operation.
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RWS - A new multiple-Antenna-Port and multiple-user-Port Antenna tuner
2015 IEEE Radio and Wireless Symposium (RWS), 2015Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:A new multiple-Antenna-Port and multiple-user-Port Antenna tuner has the structure of a multidimensional π-network. It is shown that it is able to provide decoupling and matching in the presence of strong variations in the electromagnetic characteristics of the volume surrounding the Antennas.
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Some Properties of Multiple-Antenna-Port and Multiple-User-Port Antenna Tuners
IEEE Transactions on Circuits and Systems I: Regular Papers, 2015Co-Authors: Frédéric Broydé, Evelyne ClavelierAbstract:A user Port impedance range and a user Port tuning range characterize an Antenna tuner at a given frequency. These sets and their local dimensions are defined and studied for an Antenna tuner having any number $n$ of Antenna Ports and any number $m$ of user Ports. A reciprocal Antenna tuner is said to have a full tuning capability if it can provide or compensate all relevant small impedance variations, under the assumption that its adjustable impedance devices can provide suitable reactance values. For reciprocal Antennas and a reciprocal Antenna tuner, it is proven that the local dimension of the user Port impedance range is equal to $m(m+1)$ if and only if the Antenna tuner has a full tuning capability. We use this result to study an Antenna tuner made of several uncoupled single-Antenna-Port and single-user-Port Antenna tuners. We also use this result to show that a new multiple-Antenna-Port and multiple-user-Port Antenna tuner has a full tuning capability.
Sven Parand - One of the best experts on this subject based on the ideXlab platform.
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dynamic radio frame configuration by exploiting uplink control channel for urllc
Wireless Communications and Networking Conference, 2019Co-Authors: Navuday Sharma, Hassan Malik, Muhammad Mahtab Alam, Yannick Le Moullec, Mehdi Bennis, Sven ParandAbstract:uRLLC (ultra-Reliable Low Latency Communications) requires a new paradigm in 5G cellular networks to satisfy extreme latency and reliability thresholds. Further, such constraints have a wide range due to different use case scenarios. Consequently, how to configure suitable radio frame structure that matches to the latency and reliability requirements of the given use-case is an open question. This article addresses the above-mentioned issue and provides a preliminary investigation and a feasible solution by exploiting Antenna Port selection index (APSI) calculated using fuzzy logic algorithm, which is further communicated through physical uplink control channel. Closed-form expressions of outage probability for the number of users, under given latency and reliability constraints have been provided with the mathematical proof and the results were simulated based on the prior availability of APSI. It is shown that outage probability improves up to 30% in case of dynamic radio frame configuration.
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WCNC Workshops - Dynamic Radio Frame Configuration by Exploiting Uplink Control Channel for URLLC
2019 IEEE Wireless Communications and Networking Conference Workshop (WCNCW), 2019Co-Authors: Navuday Sharma, Hassan Malik, Muhammad Mahtab Alam, Yannick Le Moullec, Mehdi Bennis, Sven ParandAbstract:uRLLC (ultra-Reliable Low Latency Communications) requires a new paradigm in 5G cellular networks to satisfy extreme latency and reliability thresholds. Further, such constraints have a wide range due to different use case scenarios. Consequently, how to configure suitable radio frame structure that matches to the latency and reliability requirements of the given use-case is an open question. This article addresses the above-mentioned issue and provides a preliminary investigation and a feasible solution by exploiting Antenna Port selection index (APSI) calculated using fuzzy logic algorithm, which is further communicated through physical uplink control channel. Closed-form expressions of outage probability for the number of users, under given latency and reliability constraints have been provided with the mathematical proof and the results were simulated based on the prior availability of APSI. It is shown that outage probability improves up to 30% in case of dynamic radio frame configuration.
Fa-shian Chang - One of the best experts on this subject based on the ideXlab platform.
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investigation of a single plate π shaped multiple input multiple output Antenna with enhanced Port isolation for 5 ghz band applications
Iet Microwaves Antennas & Propagation, 2016Co-Authors: Lihtyng Hwang, Fa-shian Chang, Shunmin WangAbstract:A simple single-plate, π-shaped multiple-input multiple-output (MIMO) Antenna with built-in Port isolation operated at 5 GHz (5150-5850 MHz) band is proposed. The MIMO Antenna is a symmetrical structure formed on a single-layered FR4 substrate. The main radiating element is of a single-plate π-shaped structure, and is 4 mm away from the Antenna ground. The ground plane in this design provides sufficient finite size to properly excite the Antenna. The π-shaped structure has a few desired features: a space saver, due to co-location of impedance matching network and isolation structure; built-in isolation and stable MIMO operations; existence of stationary current sink and source (S-S/S) points, which were proven to be the key to enhance Port isolation. Since the commonly referred neutralisation line (NL) technique does not exhibit S-S/S points; thus, our design is not considered as a NL. The radiation patterns of the two planar inverted F Antenna -like monopoles cover the complementary space regions of 45°-50°, the Antenna yields peak gain varied from 2 to 3 dBi, and radiation efficiency was >60% at 5 GHz band. The Antenna Port envelope correlation coefficient was about 0.05.
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Printed MIMO-Antenna System Using Neutralization-Line Technique for Wireless USB-Dongle Applications
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Saou-wen Su, Cheng-tse Lee, Fa-shian ChangAbstract:A printed two-multiple-input multiple-output (MIMO)-Antenna system incorporating a neutralization line for Antenna Port decoupling for wireless USB-dongle applications is proposed. The two monopoles are located on the two opposite corners of the system PCB and spaced apart by a small ground Portion, which serves as a layout area for Antenna feeding network and connectors for the use of standalone Antennas as an optional scheme. It was found that by removing only 1.5 mm long inwards from the top edge in the small ground Portion and connecting the two Antennas therein with a thin printed line, the Antenna Port isolation can be effectively improved. The neutralization line in this study occupies very little board space, and the design requires no conventional modification to the ground plane for mitigating mutual coupling. The behavior of the neutralization line was rigorously analyzed, and the MIMO characteristics of the proposed Antennas was also studied and tested in the reverberation chamber. Details of the constructed prototype are described and discussed in this paper.
Cheng-tse Lee - One of the best experts on this subject based on the ideXlab platform.
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Printed multi-Antenna isolation improvement using decoupling network for USB dongle application
2014 International Symposium on Antennas and Propagation Conference Proceedings, 2014Co-Authors: Cheng-tse LeeAbstract:A printed multi-Antenna isolation improvement with the use of decoupling network for USB dongle application is proposed. Two coupled-fed PIFAs are placed on the opposite corners of PCB and separated by a protruded ground Portion, which has the width of 14 mm as a layout area. It has been experimented and verified that a decoupling network located on the space in-between the top edge of PCB and the protruded ground plane can effectively improve the Antenna Port-to-Port isolation over 2.4 GHz and 5 GHz bands. The proposed design is a promising candidate to integrate with the module card in the form factor of a USB dongle. Detailed Antenna prototype and design consideration are discussed in the article.
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Printed MIMO-Antenna System Using Neutralization-Line Technique for Wireless USB-Dongle Applications
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Saou-wen Su, Cheng-tse Lee, Fa-shian ChangAbstract:A printed two-multiple-input multiple-output (MIMO)-Antenna system incorporating a neutralization line for Antenna Port decoupling for wireless USB-dongle applications is proposed. The two monopoles are located on the two opposite corners of the system PCB and spaced apart by a small ground Portion, which serves as a layout area for Antenna feeding network and connectors for the use of standalone Antennas as an optional scheme. It was found that by removing only 1.5 mm long inwards from the top edge in the small ground Portion and connecting the two Antennas therein with a thin printed line, the Antenna Port isolation can be effectively improved. The neutralization line in this study occupies very little board space, and the design requires no conventional modification to the ground plane for mitigating mutual coupling. The behavior of the neutralization line was rigorously analyzed, and the MIMO characteristics of the proposed Antennas was also studied and tested in the reverberation chamber. Details of the constructed prototype are described and discussed in this paper.