by variation of dielectric properties

Full Title

Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 > specially adapted for high-frequency, e.g. structures providing an impedance match or phase match (non-coaxed protective earth or shield arrangements H01R13/648; coaxed connectors specially adapted for high frequency H01R24/40) > Impedance matching > by variation of dielectric properties