| abstract |
The present invention relates to liquid-crystalline media comprisingn one or more compounds selected from the group of compounds of formulae I, II and III, nn n n n n n n n n n in which the parameters R 1 -R 3 , Z 21 , Z 31 , Z 32 and rings A 11 , A 12 , A 13 , A 21 , A 22 , A 31 , and A 32 are as defined herein, and to components comprising these media for high-frequency technology, in particular phase shifters and microwave array antennas. |