urn:nasa:pds:context:instrument:mars2020.rimfax 1.0 1.15.0.0 Product_Context RIMFAX 2021-01-26 1.0 First version urn:nasa:pds:context:instrument_host:spacecraft.mars2020 instrument_to_instrument_host 10.1007/s11214-020-00740-4 Hamran, SE., Paige, D.A., Amundsen, H.E.F. et al. Radar Imager for Mars’ Subsurface Experiment—RIMFAX. Space Sci Rev 216, 128 (2020). Radar Imager for Mars Subsurface Experiment (RIMFAX) Radar Imager RIMFAX is a ground penetrating radar that uses a single antenna to transmit (via a transmitter, TX) and receive (via a receiver, RX) electromagnetic waves over a range of frequencies (150 to 1200 MHz) into/from the surface. The instrument can be operated in either active (TX and RX) or passive (RX-only) modes. Transmitted waves propagate downward until they are reflected back by the surface and shallow interfaces in the subsurface geologic structure across which discontinuities in permittivity (i.e., storage of electrical energy in an electric field) exist.