Patent ID: 7812689

Claim:
A phase shifter including: a dielectric substrate; first and second pairs of switches; a low-pass filter connected between said first pair of switches; and a high-pass filter connected between said second pair of switches, each said switch utilizing a resonance between an off-capacitance of an FET (field effect transistor) and an inductor connected in parallel with the off-capacitance of the FET, wherein each switch has an LC series circuit comprising the inductor and an MIM (Metal Insulator Metal) capacitor arranged two-dimensionally in parallel with the FET on a surface of said dielectric substrate, and in the LC series circuit, a metal or a dielectric material with a relative dielectric constant higher than a relative dielectric constant of said dielectric substrate is arranged in a free region in a central portion of the inductor laid out to have a non-close-packed structure.