Liquid crystal compositions comprising mesogenic compounds, and devices for high-frequency thechnology

A microwave antenna array comprising a liquid-crystalline medium comprising:

• at least one compound of the formula I and
• at least one compound of the formula II
• or
• at least one compound of the formula I and
• at least one compound of the formula III
• or
• at least one compound of the formula II and
• at least one compound of the formula III
• or
• at least one compound of the formula I and
• at least one compound of the formula II and
• at least one compound of the formula III
• in which
• R11, independently of one another, denotes H, an alkyl or an alkoxy having 1 to 17 carbon atoms, or an alkenyl, an alkenoxy or an alkoxy-alkyl having 2 to 15 carbon atoms,
• independently of one another, denote
• in which
• R21, independently of one another, denotes H, an alkyl or an alkoxy having 1 to 17 carbon atoms, or an alkenyl, an alkenoxy or an alkoxy-alkyl having 2 to 15 carbon atoms,
• X21, independently of one another, denotes —NCS or —OSO2CF3,
• independently of one another, denote
• in which
• X31, independently of one another, denotes —NCS or —OSO2CF3,
• R31, independently of one another, denote H, an alkyl or an alkoxy having 1 to 17 carbon atoms, or an alkenyl, an alkenoxy or an alkoxy-alkyl having 2 to 15 carbon atoms,
• independently of one another, denote