This 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.

International audienc

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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

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