Charles, ChristineBoswell, RoderickBishop, Adrian2015-12-080022-3727http://hdl.handle.net/1885/33929A low-weight (0.12 kg) low-volume fixed ceramic capacitor impedance matching system is developed for frequency agile tuning of a radiofrequency (rf) Helicon plasma thruster. Three fixed groups of capacitors are directly mounted onto a two loop rf antennaKeywords: Driving frequencies; Frequency agile; Ignition frequency; Power transfer efficiency; Radio frequencies; Resonance frequencies; Space qualification; Variable frequencies; Ceramic capacitors; Plasma density; Plasma devices; Vacuum; Natural frequencies201310.1088/0022-3727/46/36/3652032016-02-24