LIZZI , Leonardo

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National audience

In this paper, the synthesis of a triple-band planar antenna working in the GSM (900 and 1800 MHz) and UMTS frequency bands is presented. As reference geometry, a hybrid pre-fractal shape has been adopted by integrating a Sierpinski and a Meander-line structure. The synthesis of the antenna has been performed by optimizing the descriptive...

Internet of thing will soon connect billion of objects together. Interference with existing standard in the ISM bands and outside is a hot issue to solve. Ultra-narrow band modulation has recently been proposed to decrease interference for low-data rate system. To simplify frontend design, ultra-narrow band (UNB) antenna could be used to...

International audience

A super-directive parasitic element system, with a diameter of the minimum sphere circumscribing the antenna equal to 0.2λ 0 , is simulated and measured. A maximum directivity of 7.2 dBi is measured with a radiation efficiency of -6.5 dB at 876MHz. An intermediate directivity of 5.5 dBi is observed at 884MHz with 12 dB front-to-back ratio and...

The feasibility of using ultra-narrow band (UNB) antennas for internet-of-things applications is discussed. An analysis aimed at evaluating the antenna miniaturisation limits when there are almost no bandwidth requirements is performed. Both numerical and experimental results show that, carefully taking into account the metal conductivity, it...

National audience

In this paper, the impact of the ground plane reduction imposed by modern wireless terminals on the antenna performance is evaluated. Numerical results in terms of antenna efficiency and Q-factor are discussed for two different antenna geometries.

In this paper, a dual polarized reconfigurable antenna for IoT applications is presented. The antenna can provide both vertically and horizontally polarized radiation thanks to the integration in the same structure of a segmented loop antenna and a wire-patch element. The compact and low-profile antenna structure, as well as the easy-to-control...

A novel pattern reconfigurable antenna geometry that alters between four possible states in order to collect RF energy around it is introduced in this paper. Planar Yagi-Uda elements are combined in a single patch antenna to beam steer at different angles with a large coverage over the azimuth plane. The antenna operates in a large range of...

This article presents a miniature pattern-reconfigurable antenna design. By using Digitally Tunable Capacitors (DTC), the power consumption of the antenna is limited and suitable for autonomous wireless node integration. The antenna prototype has been manufactured and measured. The obtained experimental results demonstrated the effectiveness of...

A pattern agile antenna for smart IoT gateways operating at 2.44 GHz is presented. Several radiation patterns pointing in different directions and characterized by different beamwidths can be obtained.

International audience

A pattern reconfigurable antenna system for LoRa 868 MHz communications is characterized in a practical case scenario involving Drone-to-Ground communications. The effectiveness of the beam-steering antenna is confirmed through Received Signal Strength Indicator (RSSI) airborne measurements, which indicate that the reconfiguration becomes more...