Frequency multiplier and wireless device incorporating same

A wireless device comprising a circuit which includes one of a transmitter and a receiver,

• said circuit comprising an oscillator, and further comprising a frequency multiplier which multiplies an output frequency of said oscillator and supplies a frequency-multiplied signal to another component of said circuit,
• the frequency multiplier comprising:
• a first resonant circuit resonating with a frequency of an input signal;
• a second resonant circuit resonating with a frequency n times that of the input signal;
• an idler circuit resonating with the frequency n times that of the input signal;
• and
• a variable reactor;
• wherein the first resonant circuit and the second resonant circuit are connected in parallel to a connection point disposed between an input and an output, and a parallel circuit constituted of the idler circuit and the variable reactor is connected in series between said connection point and between the input and the output so as to form a voltage-excitation frequency multiplier;
• and
• wherein the idler circuit is contained in a multi-layer substrate formed of a plurality of dielectric layers, on wtiich the variable reactor is mounted.