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.
In this paper, a contactless microwave transition is described and characterized. In our "ElectroMagnetic Drive" (EMDrive) measuring setup, it will be dedicated to transmit high Radio Frequency (RF) powers without any mechanical effort. It exhibits very good matching and transmission performances. It is found to transmit 100 W microwave power range at 2.45 GHz without any visible mechanical effect on a 10 mg precision balance, contrary to a previous coaxial cable. This device appears useful to every EMDrive setup and can be easily implemented.
This paper describes a compact isoflux X-band payload telemetry and data handling antenna with simultaneous dual circular polarization for Low Earth Orbits (LEO) satellite applications. The main objective of this antenna is to use polarization diversity to improve the efficiency of the payload telemetry link. Some solutions have already been proposed to that end, but the studied antenna combines both good electromagnetic performances and compactness. This high power capability waveguide antenna presents an axial ratio (AR) lower than 2.5 dB over the 8.025-8.4 GHz frequency band at the limit of coverage, i.e. 65°, for any azimuth angle (φ). It has been designed, realized and successfully measured.
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