Custom antenna performance

Gaston · ‎2020-10-30

Hi,

I have designed a 65x85cm 2-turn PCB antenna but I cannot place it close to the damping resistors (I use the ST25R3916 for this). How would the horizontal tracks from the damping resistors to the antenna feed affect its performance, efficiency, field strength and so on?

regards,

gaston

Travis Palmer · ‎2020-11-02

Hello Gaston,

The distance between damping resistors and antenna should not be a problem. Please make sure, that the red tracks are sufficiently thick. The same thickness as the antenna (green) traces should be fine. The antenna parameters, especially for Q-Factor/damping calculation should then be done at the damping resistor ports and not at the antenna itself to also respect the resistance / damping of the red traces.

BR Travis

View solution in original post

Travis Palmer · ‎2020-11-02

Hello Gaston,

The distance between damping resistors and antenna should not be a problem. Please make sure, that the red tracks are sufficiently thick. The same thickness as the antenna (green) traces should be fine. The antenna parameters, especially for Q-Factor/damping calculation should then be done at the damping resistor ports and not at the antenna itself to also respect the resistance / damping of the red traces.

BR Travis