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International audience; This article focuses on the design, simulation and manufacturing of a miniaturized antenna operating in two 2.4 GHz and 5.8 GHz frequency bands for WLAN applications. This antenna is made using textile materials placed over an artificial magnetic conductor (AMC). The results of simulation and measurement are in good agreement and show that AMC can isolate the human body. AMC greatly improves the performance of the antenna. The realized gain of the antenna is 6.5 dB and 7.8 dB at 2.45 GHz and 5.2 GHz respectively (an increase of 4 dB compared to an antenna without AMC). The performance of the antenna on the human body is presented.

International audience; In this paper, a 5G MIMO mobile phone prototype including four antennas working in the 10-13.2 GHz band is designed. The objective of the study is to evaluate the negative impact due to the user's hand in frequencies higher than 10 GHz. A 3D spherical near-field scanner with fixed Antenna Under Test (AUT) is leveraged in order to measure a 3D radiation pattern with a real human hand impact. S-parameters, radiation pattern and efficiency are presented. First results show that radiation pattern and efficiency are strongly impacted by the hand. This effect has to be carefully considered for millimeter Wave handheld terminal design.

International audience; A designed microstrip grid array antenna at 94 GHz in a low-temperature co-fired ceramic (LTCC) technology was fabricated and measured. The designed and measured results are in good agreement. They show a 10-dB impedance bandwidth of 5.12 GHz from 90 GHz to 95.12 GHz (or 5.45% at 94 GHz), a maximal peak realized of 17.1 dBi with a 3-dB gain bandwidth of 5.5 GHz from 92.0 GHz to 97.5 GHz (or 5.85% at 94 GHz). These good performances make the microstrip grid array antenna a suitable candidate for 94-GHz applications.

International audience; In this contribution the use of ℓ1 weighted minimization for the diagnosis of arrays from a reduced set of near-field data is investigated. Numerical results show that reweighed method gives a higher probability of an accurate estimation of the failures compared to the classic ℓ1 minimization proposed in the past literature.

International audience; The measurement of the radiation and matching performance of millimeter-wave antennas is a very challenging topic. As a single antenna usually has a size of a few square millimeters, the feeding scheme can't be as simple as a connector, especially if high measurement accuracy is needed. That's why a microelectronic probe-feeding technique is a possible improvement. However, the final choice depends on the antenna technology, and also on the way the antenna is integrated. On-chip antennas using silicon substrates, or antennas integrated into ceramics or organic packages, are today the most popular solutions, the latter being the most efficient. The measurement setup we present has been developed from a classical microelectronic-probe measurement setup, but has been mechanically modified to operate in almost a metal-free environment, especially around the antenna under test (AUT). It is then possible to measure the gain of linearly and circularly polarized radiators in several cut planes with a computed accuracy of ±0.8 dB at 60 GHz. It is also possible to measure the radiated field over a quasi-three-dimensional sphere, the microelectronic probe being the only object blocking the electromagnetic waves transmitted by the AUT. Therefore, several methods have been implemented to be able to compute the axial ratio, and the total and radiation efficiencies from these radiation measurements. Several examples are presented in this paper to demonstrate the capabilities of the setup.