Two-frequency impedance matching circuit for an antenna

An electric circuit provided between an antenna and a feeder for impedance matching at a first resonant frequency and a second resonant frequency, comprising:

• a first inductor, coupled to said antenna, whose inductance value is selected to induce an input impedance of said antenna to be capacitive at said first resonant frequency and to induce said input impedance of said antenna to be inductive at said second resonant frequency, said first resonant frequency being lower than said second resonant frequency;
• a first capacitor, coupled to said first inductor, whose capacitance value is selected to substantially equalize a reactance component at said first resonant frequency and a reactance component at said second resonant frequency;
• and
• a combination of a second inductor and second capacitor, coupled between said first capacitor and said feeder, whose values are selected to match an impedance of said antenna and said first inductor and said first capacitor, to an impedance of said feeder simultaneously at both of said first and second resonant frequencies to thereby allow said antenna to resonate at said first and second resonant frequencies.