Abstract In this paper, we focus on multiple antenna-systems for portable UMTS devices. First, we... more Abstract In this paper, we focus on multiple antenna-systems for portable UMTS devices. First, we perform a state-of-the art review of the best solutions developed all around the world. Then, we present all the UMTS multi-antenna systems designed at the LEAT of the ...
In this paper, we present a parameter study of the port-to-port isolation of two UMTS Planar Inve... more In this paper, we present a parameter study of the port-to-port isolation of two UMTS Planar Inverted-F Antennas (PIFAs) versus the length and the width of the ground plane where they are placed. From those results, an efficient multiPIFA system suitable for a clamshell type UMTS mobile phone is designed, fabricated and measured.
In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS ha... more In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS handset by using a phased two-element PIFA array. The structure is composed of a 100x40 mm 2 metallic ground plane acting as the Printed Circuit Board (PCB) of the mobile phone. Two UMTS PIFAs are located at the top edge of this PCB. They
In this paper, we describe the design of a novel two-antenna UMTS mobile phone structure able to ... more In this paper, we describe the design of a novel two-antenna UMTS mobile phone structure able to either radiate vertically or horizontally polarized electric fields in the azimuthal plane of the phone depending the relative phase of the input signals of each antenna. Then, we introduce a structure where the two UMTS PIFAs are positioned in the same manner, but
2007 IEEE Antennas and Propagation International Symposium, 2007
In this paper, we propose the computation of the envelope correlation (rhoe), the diversity syste... more In this paper, we propose the computation of the envelope correlation (rhoe), the diversity system gain (DSG) and the mean effective gain (MEG) of two-antenna systems (with and without the neutralization technique) in indoor and outdoor environments from the simulated radiation patterns. The analysis of the results demonstrates the overall improvement brought back by the neutralization technique.
2010 International Workshop on Antenna Technology (iWAT), 2010
... Thereafter, we present several multiple antenna-systems designed at the LEAT of the Universit... more ... Thereafter, we present several multiple antenna-systems designed at the LEAT of the University of Nice-Sophia Antipolis since 2004 ... The author would like to warmly thank Anissa Chebihi, Rafik Adacci, Adnan Lhilali, Aliou Diallo, Philippe Le Thuc, Robert Martens, Robert Staraj ...
ABSTRACT An RF transponder is a system allowing contactless identification or communication in ap... more ABSTRACT An RF transponder is a system allowing contactless identification or communication in applications ranging from mountain/sea rescue to automatic waste management. Such a system is woken by an interrogating signal and sends back a coded response. A potential application in Intelligent Transport Systems concerns dedicated short-range communications (DSRC), in which information is exchanged between roadside units and on-board transponders. The European pre-standard defining the framework for DSRC recommends a 5.8 GHz carrier frequency within a 10 MHz band. Since the communication distance extends from a few meters (vehicle tolling applications) to several tens of meters (traffic information), a small primary battery must be inserted in the transponder. The purpose of this paper is to present two transponders suitable for this specific application, both based on the locking of a local oscillator by a pure interrogating RF frequency
2007 IEEE Antennas and Propagation International Symposium, 2007
In this paper a method which increases both mutual coupling and efficiency is presented. It is ba... more In this paper a method which increases both mutual coupling and efficiency is presented. It is based on hardware modification and applied to patch antenna arrays. It is seen that by increasing the mutual coupling, the channel capacity is increased significantly. In addition, this method removes, over a certain frequency band, the main drawback of mutual coupling: the losses at
2006 First European Conference on Antennas and Propagation, 2006
The researchers of the Electronics, Antennas and Telecommunications Laboratory (LEAT) of the Univ... more The researchers of the Electronics, Antennas and Telecommunications Laboratory (LEAT) of the University of Nice started to focus on printed antennas in 1984. After designing simple structures, numerical and analytical models were already developed. Then, they designed patches having different shapes, printed arrays, active and miniature antennas. The purpose of this paper is to give an overview of the most
Abstract In this paper, we focus on multiple antenna-systems for portable UMTS devices. First, we... more Abstract In this paper, we focus on multiple antenna-systems for portable UMTS devices. First, we perform a state-of-the art review of the best solutions developed all around the world. Then, we present all the UMTS multi-antenna systems designed at the LEAT of the ...
In this paper, we present a parameter study of the port-to-port isolation of two UMTS Planar Inve... more In this paper, we present a parameter study of the port-to-port isolation of two UMTS Planar Inverted-F Antennas (PIFAs) versus the length and the width of the ground plane where they are placed. From those results, an efficient multiPIFA system suitable for a clamshell type UMTS mobile phone is designed, fabricated and measured.
In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS ha... more In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS handset by using a phased two-element PIFA array. The structure is composed of a 100x40 mm 2 metallic ground plane acting as the Printed Circuit Board (PCB) of the mobile phone. Two UMTS PIFAs are located at the top edge of this PCB. They
In this paper, we describe the design of a novel two-antenna UMTS mobile phone structure able to ... more In this paper, we describe the design of a novel two-antenna UMTS mobile phone structure able to either radiate vertically or horizontally polarized electric fields in the azimuthal plane of the phone depending the relative phase of the input signals of each antenna. Then, we introduce a structure where the two UMTS PIFAs are positioned in the same manner, but
2007 IEEE Antennas and Propagation International Symposium, 2007
In this paper, we propose the computation of the envelope correlation (rhoe), the diversity syste... more In this paper, we propose the computation of the envelope correlation (rhoe), the diversity system gain (DSG) and the mean effective gain (MEG) of two-antenna systems (with and without the neutralization technique) in indoor and outdoor environments from the simulated radiation patterns. The analysis of the results demonstrates the overall improvement brought back by the neutralization technique.
2010 International Workshop on Antenna Technology (iWAT), 2010
... Thereafter, we present several multiple antenna-systems designed at the LEAT of the Universit... more ... Thereafter, we present several multiple antenna-systems designed at the LEAT of the University of Nice-Sophia Antipolis since 2004 ... The author would like to warmly thank Anissa Chebihi, Rafik Adacci, Adnan Lhilali, Aliou Diallo, Philippe Le Thuc, Robert Martens, Robert Staraj ...
ABSTRACT An RF transponder is a system allowing contactless identification or communication in ap... more ABSTRACT An RF transponder is a system allowing contactless identification or communication in applications ranging from mountain/sea rescue to automatic waste management. Such a system is woken by an interrogating signal and sends back a coded response. A potential application in Intelligent Transport Systems concerns dedicated short-range communications (DSRC), in which information is exchanged between roadside units and on-board transponders. The European pre-standard defining the framework for DSRC recommends a 5.8 GHz carrier frequency within a 10 MHz band. Since the communication distance extends from a few meters (vehicle tolling applications) to several tens of meters (traffic information), a small primary battery must be inserted in the transponder. The purpose of this paper is to present two transponders suitable for this specific application, both based on the locking of a local oscillator by a pure interrogating RF frequency
2007 IEEE Antennas and Propagation International Symposium, 2007
In this paper a method which increases both mutual coupling and efficiency is presented. It is ba... more In this paper a method which increases both mutual coupling and efficiency is presented. It is based on hardware modification and applied to patch antenna arrays. It is seen that by increasing the mutual coupling, the channel capacity is increased significantly. In addition, this method removes, over a certain frequency band, the main drawback of mutual coupling: the losses at
2006 First European Conference on Antennas and Propagation, 2006
The researchers of the Electronics, Antennas and Telecommunications Laboratory (LEAT) of the Univ... more The researchers of the Electronics, Antennas and Telecommunications Laboratory (LEAT) of the University of Nice started to focus on printed antennas in 1984. After designing simple structures, numerical and analytical models were already developed. Then, they designed patches having different shapes, printed arrays, active and miniature antennas. The purpose of this paper is to give an overview of the most
A ball grid array-module (BGA-module) incorporating a low-cost shaped dielectric lens is proposed... more A ball grid array-module (BGA-module) incorporating a low-cost shaped dielectric lens is proposed for wireless communications in the 60-GHz WiGig band between a smart eye-wear, where it is integrated and facing a laptop or TV. The module, which is codesigned with a 60-GHz transceiver, consists of two separate identical antennas for transmitting (Tx) and receiving (Rx). The in-plane separation of these elements is 6.9 mm both being offset from the lens focus. This poses a challenge to the lens design to ensure coincident beam pointing directions for Rx and Tx. The shaped lens is further required to narrow the angular coverage in the elevation plane and broaden it in the horizontal plane. A 3-D-printed eyewear frame with an integrated lens and a recess for proper BGA-module integration is fabricated in ABS-plastic material. Measurements show a reflection coefficient below −12 dB in the 57–66 GHz band. A maximum gain of 11 dBi is obtained at 60 GHz, with 24 • and 96 • beamwidth at 5-dBi gain, respectively, in the vertical and horizontal planes. The radiation exposure is evaluated for a homogeneous SAM head phantom and a heterogeneous visible human head. The simulated power density values for both models are found to be lower than the existing standards.
The design of a micromachined polyethylene lens for WiGig modules is described and its electromag... more The design of a micromachined polyethylene lens for WiGig modules is described and its electromagnetic characteristics are measured. The lens is electromagnetically fed by linearly polarized Tx and Rx patch antennas integrated in an existing ball-grid-array (BGA) organic module. Antennas are separated from each other by a distance of 4.45 mm (0.89lambda at 60 GHz). The goal of the lens is to increase the gain of each antenna while lowering the beam depointing effect due to their offset position regarding the focal point of the lens. A geometrical optics/physical optics (GO/PO) hybrid method is applied to the design and analysis of the lens shape for noncollimating purpose. Using a lens height of 30 mm for both Tx and Rx antennas, a 13-dBi minimum realized gain from 54 to 66 GHz is obtained. Compared to an elliptical lens providing an equivalent realized gain over the same bandwidth, the depointing angle from the boresight direction is reduced from 15° to 4°. Full-wave simulations are verified by measurements.
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Papers by Cyril Luxey