In this contribution we outline our newest results in finding the true properties of the RPW antennas aboard Solar Orbiter with emphasis on our near-field measurement campaign and corresponding computer simulation. In the course of the project a scale model of the Solar Orbiter spacecraft was manufactured and placed in an anechoic near-field facility. The measurement campaign includes wave-length scaled illumination and scanning of the scale model antennas for finding individual radiation pattern, as well as measurements of the antenna scattering parameters. Overarching goal of the project was to investigate the possibility of using scale model measurements for verification of E-field instrument sensors in the regime above the quasi-static range, as well as provide useful calibration results for the RPW instrument team, allowing significant improvements of the corresponding scientific data analysis.

In this contribution we derive the transfer function of a typical RFID channel as defined in ISO 14443. RFID is common technology and has applications in various contexts such as keyless entry and logistics. In the following the principle of such a system is briefly outlined and an equivalent circuit is introduced. The transfer function itself is derived via a state space model approach which are a widely used concept, especially in control engineering. Finally the resulting transfer function is compared to a conventionally derived transfer function. The results show that the derived function is correct within the inherent errors of such concepts and approximations. In addition, the resulting matrix-shape state space model is a good basis for further investigations such as mitigating intersymbol interference on the channel.