Antenna tuning circuitry with reduced interference

Antenna circuitry comprising:

• a low-band resonant conduction element;
• a high-band resonant conduction element;
• and
• antenna tuning circuitry comprising:
• an antenna tuning node coupled directly to one of the low-band resonant conduction element and the high-band resonant conduction element;
• an antenna tuning switch;
• a resonant tuning circuit coupled between the antenna tuning switch and the antenna tuning node such that the resonant tuning circuit is coupled directly to the antenna tuning node and the antenna tuning switch is coupled between the resonant tuning circuit and ground, the resonant tuning circuitry configured to resonate at one or more harmonic frequencies of the antenna tuning switch such that a high impedance path is formed between the antenna tuning switch and the antenna tuning node at the one or more harmonic frequencies generated by the antenna tuning switch, wherein when the antenna tuning switch is closed, the antenna tuning circuitry is configured to change an impedance of the resonant conduction element of the antenna such that a resonant frequency of the resonant conduction element is changed;
• an additional antenna tuning switch;
• and
• an additional resonant tuning circuit coupled between the additional antenna tuning switch and the antenna tuning node and configured to resonate at one or more harmonic frequencies of the additional antenna tuning switch such that a high impedance path is formed between the additional antenna tuning switch and the antenna tuning node at the one or more harmonic frequencies generated by the additional antenna tuning switch.