B. Poussot

PIFA top-loaded monopole antenna with diversity features for WBAN applications

A miniaturized diversity antenna dedicated to wireless body area network (WBAN) applications is described. The combination of a planar inverted-F antenna (PIFA) and a top-loaded monopole yields distinct patterns fitting the different natures of the received waves. The strong isolation observed between the broadside and endfire ports is an important feature to limit the correlation between the received signals. The diversity gain is measured for three links and three scenarios between body-worn antennas, showing the improvement brought by the antenna diversity in the WBAN context.

Intelligent antenna selection decision in IEEE 802.15.4 wireless sensor networks

Display Omitted We design a new radio module, an Inverted-F Antenna for 2.4GHz bandwidth WSNs.Experiments performed in garden, office, reverberation and anechoic chamber.Experimental results confirm the gain of 6-10dB of the proposed radio module.We propose an intelligent antenna selection strategy to exploit antenna diversity.We propose a prototype of diversity antenna and the intelligent switch design. The goal of this paper is to study the feasibility of making intelligent antenna selection decision in IEEE 802.15.4 Wireless Sensor Networks (WSNs). This study provides us the basis to design and implement software defined intelligent antenna switching capability to wireless sensor nodes based on Received Signal Strength Indicator (RSSI) link quality metric. First, we discuss the results of our newly designed radio module (Inverted-F Antenna) for 2.4GHz bandwidth (WSNs). Second, we propose an intelligent antenna selection strategy to exploit antenna diversity. Third, we propose the prototype of our diversity antenna for the TelosB mote and the intelligent switch design. Finally, we compare the performance of the built-in TelosB antenna with our proposed external antenna in both laboratory and realistic environments. Experimental results confirm the gain of 6-10dB of the proposed radio module over the built-in radio module of the TelosB motes.

Towards intelligent antenna selection in IEEE 802.15.4 wireless sensor networks

We plan to design and implement software defined intelligent antenna switching capability to wireless sensor nodes based on link quality metric, such as Received Signal Strength Indicator (RSSI). In this paper, as a first step, we discuss the preliminary results of our newly designed radio module (Inverted-F Antenna) for 2.4 GHz bandwidth wireless sensor networks. In this perspective, we consider the TelosB motes and compare the performance of the built-in TelosB antenna with our proposed antenna. Experimental results confirm the effectiveness of the proposed radio module i.e., 5% to 12% gain over the built-in radio module of the TelosB motes.

Multiband waveform synthesis and detection for a wideband MIMO radar

In the context of wideband Multiple-Input Multiple-Output (MIMO) radar, this paper presents a waveform design technique using multiple frequency bands, satisfying a low Peak-to-Average Power Ratio (PAPR) constraint. We then adapt a Direction-of-Arrival (DOA) estimation technique, known as TOPS (Test of Orthogonality of Projected Subspaces) in the literature, to the received signals in a MIMO radar system.

A new method and transceiver architecture dedicated to continuous detection of very small metallic object

In this paper, we propose a multi-band impulse detection technique to improve the detection of small objects. The choice of frequency bands is based on millimeter ultra-wideband (UWB) normalization and is related to the radar cross section of the objects to be detected. A nomadic impulse architecture associated with the detection principle is proposed. By using two orthogonal polarizations, our results show that multi-band impulse method offers better performances in terms of continuous detection surface compared to conventional single band detection system.

Combined RFID tag antenna for recipients containing liquids

RFID systems are characterized by a changing environment which perturbs and degrades the performances of each system component. Passive tag antennas are the most affected by these variations, the tag functionalities vary by changing the surface where it is attached and in some case even the content of boxes or recipients has an influence. A combined antenna is designed in order to ensure a read range for a plastic recipient containing water or not. Before, two particular antennas are proposed to work in each case, both situations are analyzed separately to observe their performances and extract their advantages to join them in one unique structure less sensitive within a limited read range.

On wideband MIMO radar: Detection techniques based on a DFT signal model and performance comparison

Wideband Multiple-Input Multiple-Output (MIMO) radar systems have improved performance compared to narrowband systems, including higher resolution and better parameter estimation. In this context, this paper presents a DFT signal model and adaptations of narrowband detection techniques to this model. Next, the performance of these techniques is evaluated after transmitting wideband probing signals designed by the Spectral Focusing Beampattern synthesis Technique (SFBT).

Compact millimeter wave architecture dedicated to object detection using dual band — dual polarization and impulse method

A dual band — dual polarization system is proposed to improve detection performances in terms of continuous detection. The dedicated architecture uses impulse mode with differential structure. For improving detection range, cumulative detection is used. Results from simulations are presented for metallic cylinder in comparison with conventional single — band detection system.

An experimental platform for MIMO radar with colocated antennas

This paper presents an experimental platform for Multiple-Input Multiple-Output (MIMO) radar. Some detection techniques which have been recently proposed, such as Capon and the Generalized Likelihood Ratio Test (GLRT), will be tested in order to analyze their performance in real conditions.