N
T
Last name: NGUYEN
First name: Tran Quang Khai
rapport de stage, stage de master HCMC University, encadré par Fabien Ferrero
The work in this thesis has been funded by the French FUI project MASS-START (2017-2020). The project aims at the integration of 5G compatible baseband and radio subsystems into an Over-Air-Interface-based 5G terminal and gNodeB demonstrator, and the antenna array for end-to-end Multiple Input Multiple Output link experimentation. The scope of...
The objective of this paper is to study the influence of phase resolution on beamforming capabilities for an antenna array placed in a mobile phone at 26.0 GHz. A 4-elements array is measured and beamforming characteristics are calculated for different phase resolutions.
In this paper, two different feeding techniques forpatch antenna placed on a multi-layer PCB build-up are studied. Despite inner layers loss, apertures coupling to a patch antennashow efficient results. It is dedicated to work at 5G n258 band. The design gives close performances to the one using via direct connect, given the same patch height...
Dans cet article, le défi de la conception d'antenne pour un smartphone avec un écran occupant la totalité de la surface du terminal est investigué. Pour répondre à ce défi, une technique d'optimisation multi-domaine est proposée. Un algorithme de type "Particle Swarm Optimizer" (PSO) est utilisé en combinaison avec les logiciels commerciaux...
A miniature antenna working in European, Asian and Australian ISM sub-GHz bands is presented for IoT application. The antenna was first designed and simulated to achieve a low quality factor, i.e. having good matching at 896MHz. A second-order matching network was then designed to make the antenna achieve broadband between dual desired band at...
In this paper, the challenge of antenna design for a full-screen smartphone will be analyzed and an optimization methodology is introduced. The Particle Swarm Optimization algorithm is used in combination with HFSS and Optenni commercial software in order to simultaneously optimize the antenna geometry and the matching network. Optimizing...
In the last decade, the smartphone screen size has constantly increased, and it is now covering the large majority of the terminal. Touch screen are inherently made of conductive material and thus are limiting the space available for the antenna design. In order to guarantee the multiple bands operation required for the future 5G standards and...
In this paper, a novel antenna suitable for wearable LoRa devices is introduced. Its size is just 42.5 x 45 mm2, similarto the size of a watch, thanks to the advantage of a wire-patch antenna structure. The proposed antenna operates at 868MHz frequency band with the realized gain up to 0.4 dBi. This antenna is proved to be better than former...
This paper gives details about simulation and measurement calculations of total scanning power and coverage efficiency parameters. The coverage efficiency CDFs matches numerical output very well with the measured one at high gain. Although the uncertainties of fabrication and measurement processes make quite a big different at lower gain, the...
This paper studies the reduction of frequency bandwidth in a modern full-screen mobile terminal as a function of the clearance area reserved for the antenna. This can be quantified for a given antenna structure in terms of the Q-factor. The realized Q-factor is here calculated using either the surface currents or the frequency derivative of the...
This paper study the performance of a compact measurement solution to calibrate and assess over-the-air (OTA) performance of FR2 active antenna array. Radiation pattern can automatically measured for multiple beamforming configurations in Tx and Rx mode. The open configuration make the debug and testing easier in the early stage of the project....
In this paper, a flexible reconfigurable antenna suitable for wearable applications is presented. Thanks to the reconfiguration mechanism, the antenna is robust in terms of impedance matching to the folding of the structure.
In this paper, a design methodology for multiple access antenna operating at different frequency bands is presented. The single antenna structure is successfully designed to efficiently radiate at both LoRa 863 MHz - 870 MHz and GPS L1 1563 MHz - 1587 MHz bands by exciting 2 different ports with the help of a suitable matching circuit. The...
In this paper, the way to design different shapes of miniature antenna for LoRa devices are presented. With dimension of 0.06 lambda x 0.1 lambda the proposed antennas are printed on 34x80x0.8 mm3 FR-4 board . The simulation and experiment results show a good agreement with expectations of the electrical small antennas that operate at 868 MHz...
This paper presents the experimental evaluation of the effects of the user's fingers on the performance of a 5G terminal antenna array operating in the European 5G regulated band at 26 GHz. Matching and radiation characteristics of a four-element linear array constituted by aperture-coupled elements integrated into the mobile terminal are...
In this paper, the signal propagation measurement of LoRa devices that was realized in the indoor environment is presented. The scenario is setup at 12-floor dormitory B of Vietnam National University HCM. The devices using for measurement are a commercial LoRa gateway and the end nodes that designed by University of Information Technology. By...