Manipulating the LDOS and directivity of quantum emitters with magneto-electric antennas

International audienc

16-port Cavity-backed Aperture-coupled Patch Antenna for On-antenna Power Combining

This article proposes a novel multiport antenna topology aimed at enhancing on-antenna power combining (OAPC) capabilities. Leveraging the degenerated TE120 and TE210 sub-modes of a cavity-backed (CB) slot antenna, this design allows highly efficient feeding through the utilization of numerous ports (>8). In comparison to on-circuit power combining at the monolithic microwave integrated circuit (MMIC) level, this approach achieves improved efficiency, higher transmitted power, reduced MMIC size, and enhanced heat dissipation. To validate the concept, up to eight pairs of differential feedings (16 ports) are integrated into a polarization versatile antenna. Linearly polarized differentially fed antennas with 2, 4, and 16 ports are experimentally designed and fabricated for operation in S-band for comparison. Large-signal results demonstrate a notable +9 dB increase in radiated power for the active 16-port configuration compared to the active 2-port configuration, showcasing the promising OAPC capabilities. The proposed structure is anticipated to be highly valuable for active antenna arrays in radar and telecommunication applications

Characterization of Optically-Reconfigurable Metasurfaces by a Free Space Microwave Bistatic Technique

Microwave performance extraction of optically-controlled squared frequency-selective surface (FSS) structures printed on highly resistive (HR) silicon substrate are presented, from a innovative bistatic microwave photonic characterization technique operating in the 40 to 60 GHz frequency range, commonly used for radar cross section (RCS) measurements. According to typical physical photon absorption phenomenon occurring in photoconductive materials, these structures demonstrate experimentally a bandpass filtering frequency response cancellation through reflection coefficient measurements, under specific incident collective illumination in the Near-infrared region (NIR). This behaviour is attributed to their microwave surface impedance modification accordingly to the incident optical power, allowing ultrafast reconfigurability of such devices by optic

Antenne élémentaire du type agile et du type antenne cavité ; antenne réseau comportant une pluralité de telles antennes élémentaires

Antenne élémentaire du type agile en polarisation et du type antenne cavité ; Antenne réseau comportant une pluralité de telles antennes élémentaires. Cette antenne élémentaire (101) comporte une cavité (102) délimitée par des faces avant et arrière (110, 130) et des parois latérales (122), la face avant étant munie de première et seconde fentes (112, 113) disposées en croix, de sorte que, lorsque la cavité (102) fonctionne dans un mode TE210, une onde polarisée perpendiculairement à la première fente (112) est émise et lorsque la cavité fonctionne dans un mode TE120, une onde polarisée perpendiculairement à la seconde fente (113) est émise. Cette antenne élémentaire se caractérise en ce que la face arrière (130) est portée à un potentiel électrique de référence, et en ce que l’antenne élémentaire comporte un dispositif d’excitation, comme un via métallisé, capable d’exciter la face avant à travers la cavité, le dispositif d’excitation excitant la face avant en une pluralité de points d’excitation (111), répartis sur la face avant et présentent une impédance prédéfinie commune. Figure pour l'abrégé : figure

Influence des résonances dipolaires électrique et magnétique sur la directivité d'antennes optiques

National audienc

Développement de matériaux absorbants faible épaisseur et très faible masse pour application spatiale en bande S

National audienc

Surface Auto Complémentaire à Faible Signature pour antennes et absorbants

National audienc

Equivalent Circuit Model of a Self-Complementary Connected Array Antenna

International audienc

Ultra-Low Loss Slot-Line Based Common Mode Isolator

In this paper, a low-loss balanced microstrip common-mode (CM) isolator based on slot lines is proposed. Two microstrip-driven signals in opposite phase are combined into a slot line with a special geometry. Placed back-to-back, this configuration provides a good balanced-microstrip to balanced-microstrip common mode isolation. A transmission line CM model is proposed. Measurement results show −22dB of commonmode rejection as well as a differential mode (DM) insertion loss as low as −0.15dB at 2.45 GHz. This low loss structure is of particular interest for balanced feed structures using two out of phase unbalanced amplifiers

RCS reduction with a Dual Polarized Self-Complementary Connected Array Antenna.

International audienceIn this paper, a wideband dual polarized self-complementary connected array antenna with low radar cross section (RCS) under normal and oblique incidence is presented. First, an analytical model of the multilayer structure is proposed in order to obtain a fast and reliable predimensioning tool providing an optimized design of the infinite array. The accuracy of this model is demonstrated thanks to comparative simulations with a full wave analysis software. RCS reduction compared to a perfectly conducting flat plate of at least 10 dB has been obtained over an ultrawide bandwidth of nearly 7:1 at normal incidence and 5:1 (3.8 to 19 GHz) at 60° in both polarizations. These performances are confirmed by finite element tearing and interconnecting computations of finite arrays of different sizes. Finally, the realization of a 28x28 cell prototype and measurement results are detailed