A radiofrequency transmission line configured so as to allow a radiofrequency electrical signal to be transmitted between a first end and a second end, the transmission line including a main conductor and a ground plane electrically connected to an electrical ground of the transmission line. The ground plane includes a set of portions that are connected in series between the first end and the second end and a set of second capacitors, the set of portions including a set of second portions, each second capacitor being inserted between two contiguous second portions.