Liquid-crystalline medium and high-frequency components comprising same

A liquid-crystal medium comprising:

• one or more compounds selected from formulae I-3a to I-3d:
• in which
• R1 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms;
• one or more compounds selected from formula II:
• in which
• R2 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms,
• Z21 denotes trans-CH═CH—, trans-CF═CF— or —C≡C—, and
• independently of one another, denote
• and one or more compounds selected from formula III-1b:
• in which
• R3 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms,
• wherein the amount of compounds of formula III-1b in said medium is in the range from 5 to 45 wt. %,
• wherein the liquid-crystal medium has a clearing point of 90° C. or more,
• wherein the medium has a material quality, η, of 20 or more at 20° C. and 19 GHz, and
• wherein the total concentration of compounds of formulae I-3a to I-3d, II, and III-1b is 90% to 100%.