Nouvelles architectures d’antennes à éléments parasites pour la polarisation circulaire : Application à la conception d’une antenne en bande X pour nanosatellite

The investigations presented in this thesis propose the synthesis of circularly polarized antennas with parasitic elements. An innovative and effective strategy is developed and implemented to synthesize a multi-objective radiation patterns. Parasitic elements can also be associated with other antennas to improve the performances. Two antennas were suggested. The first one represents a wide band circularly polarized directive antenna with parasitic elements. This demonstrator consists of the combination of 18 parasitic dipoles with a logarithmic spiral antenna; this antenna was manufactured and measured. The second antenna is a part of a space project « Isoflux X-Band antenna for Nano-Satellite». This compact antenna has been developed to support transmission rates for future mission.Les investigations présentées dans ce mémoire de doctorat portent sur la synthèse d’antennes à éléments parasites à polarisation circulaire. Une stratégie de conception rapide et efficace est développée et mise en oeuvre pour synthétiser des diagrammes de rayonnement à multiples objectifs. Des éléments parasites peuvent ainsi être associés à d’autres antennes pour en améliorer les performances. Deux antennes ont été imaginées. Un premier démonstrateur d’AEP directive à polarisation circulaire et à bande élargie a été conçu. Ce démonstrateur qui se compose de l’association de 18 dipôles parasites avec une antenne spirale logarithmique a été fabriqué et mesuré. Un second prototype d’AEP a été inventé dans le cadre d’un projet spatiale «Antenne Isoflux Bande-X pour nano-satellite». L’antenne compacte a été développée pour supporter les débits de transmission des futures missions des plateformes Nano-Satellite « Cube-Sat ». Ce prototype associe une antenne patch avec une distribution de 12 dipôles parasites pour réaliser une couverture Isoflux en polarisation circulaire. Cette antenne a été mesurée sur sa plateforme d’accueil

New architectures of antennas with parasitic elemen ts for circular polarization : Application for the design of an X-band antenna for Nano-Satellite

Les investigations présentées dans ce mémoire de doctorat portent sur la synthèse d’antennes à éléments parasites à polarisation circulaire. Une stratégie de conception rapide et efficace est développée et mise en oeuvre pour synthétiser des diagrammes de rayonnement à multiples objectifs. Des éléments parasites peuvent ainsi être associés à d’autres antennes pour en améliorer les performances. Deux antennes ont été imaginées. Un premier démonstrateur d’AEP directive à polarisation circulaire et à bande élargie a été conçu. Ce démonstrateur qui se compose de l’association de 18 dipôles parasites avec une antenne spirale logarithmique a été fabriqué et mesuré. Un second prototype d’AEP a été inventé dans le cadre d’un projet spatiale «Antenne Isoflux Bande-X pour nano-satellite». L’antenne compacte a été développée pour supporter les débits de transmission des futures missions des plateformes Nano-Satellite « Cube-Sat ». Ce prototype associe une antenne patch avec une distribution de 12 dipôles parasites pour réaliser une couverture Isoflux en polarisation circulaire. Cette antenne a été mesurée sur sa plateforme d’accueil.The investigations presented in this thesis propose the synthesis of circularly polarized antennas with parasitic elements. An innovative and effective strategy is developed and implemented to synthesize a multi-objective radiation patterns. Parasitic elements can also be associated with other antennas to improve the performances. Two antennas were suggested. The first one represents a wide band circularly polarized directive antenna with parasitic elements. This demonstrator consists of the combination of 18 parasitic dipoles with a logarithmic spiral antenna; this antenna was manufactured and measured. The second antenna is a part of a space project « Isoflux X-Band antenna for Nano-Satellite». This compact antenna has been developed to support transmission rates for future mission

Mise au point d'antennes à éléments parasites large bande à polarisation circulaire

National audienc

Circularly polarized directive antenna with parasitc elements for wide band applications

International audienceThis paper presents the design of a directive and circularly polarized antenna with parasitic elements over the [2.23-2.68] GHz frequency band. The objective of this work is to design an architecture parasitic antenna with single feed element that meets to the radiation objectives: a broadside directional beam with circular polarization over the [2.23-2.68] GHz frequency band

Synthesis of a Wide Band Circularly Polarized Directive Parasitic Elements Antenna

International audienceThis paper develops a directive circularly polarized wide band antenna. A distribution of parasitic dipoles is joined to a spiral antenna to enhance the forward circular radiation over a bandwidth more than 20%. The electromagnetic responses of the parasitic dipoles are optimized thanks to SMD inductors and capacitors welded onto the dipoles

X-band compact dual circularly polarized isoflux antenna for nanosatellite applications

International audience— This paper presents an original solution to design a compact dual circularly polarized isoflux antenna (DCPIA) for nanosatellite applications. This kind of antenna has been previously designed in our laboratory, for a single circular polarization. This antenna is composed of a dual circularly polarized feed and a choke horn antenna. This feed is a cross-shaped slot in the ground plane which provides coupling between a patch and a ring microstrip line with two ports. It is located at the centre of a choke horn antenna. The simulated antenna presents an axial ratio (AR) lower than 3 dB and a realized gain (RG) close to 0 dB over a 400 MHz bandwidth (8.0-8.4GHz) at the limit of coverage (LOC), i.e. 65° whatever the azimuth angle (φ) and the port. A 20 dB matching for each port and 13 dB isolation characteristics between the two ports have been achieved on this bandwidth. It has been realized and successfully measured

X-band compact choke horn antenna with circular polarization and isoflux pattern for nanosatellite applications

International audienc

Total efficiency enhancement of X-band compact choke horn antenna with circular polarization and isoflux pattern

International audienc

New Concept of Telemetry X-Band Circularly Polarized Antenna Payload for CubeSat

International audienceThis article presents a new concept of compact circularly polarized X-Band [8-8.4GHz] antenna for the 3U-CubeSat platforms. Despite the integration constraints on the top face of the CubeSat, the design aims at an isoflux radiation pattern. This antenna associates a driving patch antenna and twelve parasitic crossed dipoles, both to minimize the axial ratio in the opening angle θ θ θ θ=± ± ± ±65° and to shape the radiation pattern. The patch excitation is carried out by a compact sequential-phase feed microstrip circuit. This antenna is manufactured and measured