... 2007. ... A required switch must transmit a signal without losses in the open state and completely reflect it in the closed state. This property is ensured if the impedance of the switching element is much larger than the impedance of the line in the open state and is much smaller than the impedance of the line in the closed state. ... Fig. ... It is convenient to use the following simple relation for the ratio of the impedances in the open and closed states Z on / Z off 1 µm Fig. ... 4 2007 Fig. ...