Component for high-frequency technology, characterised in that it comprises a liquid-crystal medium comprising one or more compounds of formula T in which R T denotes halogen, CN, NCS, R F, R F -O- or R F -S-, wherein R F denotes fluorinated alkyl or fluorinated alkenyl having up to 12 C atoms, and on each occurrence, independently of one another, denote L 1 and L 2 identically or differently, denote F, Cl or methyl, and t is 0, 1 or 2, and one or more compounds selected from the group of compounds of formulae I, II and III, in which R 1 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms, or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl havin 2 to 15 C atoms, in which one or more CH 2 -groups may be replaced by n is 0, 1 or 2, to on each occurrence, independently of one another, denote or, in which R L, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms, and wherein alternatively denotes R 2 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, in which one or more CH 2 -groups may be replaced by Z 21 denotes trans -CH=CH-, trans -CF=CF- or -C≡C-, and and independently of one another, denote or, in which R L, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms; R 3 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, in which one or more CH 2 -groups may be replaced by one of Z 31 and Z 32, denotes trans -CH=CH-, trans -CF=CF- or -C≡C- and the other one, independently thereof, denotes -C≡C-, trans -CH=CH-, trans-CF=CF- or a single bond, and to independently of one another, denote or, in which R L, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms, and wherein alternatively denotes R T denotes halogen, CN, NCS, R F, R F -O- or R F -S-, wherein R F denotes fluorinated alkyl or fluorinated alkenyl having up to 12 C atoms, and on each occurrence, independently of one another, denote L 1 and L 2 identically or differently, denote F, Cl or methyl, and t is 0, 1 or 2, R 1 denotes H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms, or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl havin 2 to 15 C atoms, in which one or more CH 2 -groups may be replaced by n is 0, 1 or 2, to on each occurrence, independently of one another, denote or, in which R L, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms, and wherein alternatively denotes R 2 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, in which one or more CH 2 -groups may be replaced by Z 21 denotes trans -CH=CH-, trans -CF=CF- or -C≡C-, and and independently of one another, denote or, in which R L, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms; R 3 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, in which one or more CH 2 -groups may be replaced by one of Z 31 and Z 32, denotes trans -CH=CH-, trans -CF=CF- or -C≡C- and the other one, independently thereof, denotes -C≡C-, trans -CH=CH-, trans-CF=CF- or a single bond, and to independently of one another, denote or, in which R L, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms, and wherein alternatively denotes