Can this Antena cause the nRF51 chips to burn?

[myjtag]

Hi, I have used this antenna for my nRF51 layout, but it seems that the device is using very high currents! like in order of 200mA, I just wanted to know if this is because the antenna is a short circuit at DC or I have done something else wrong!

[Roger Clark]

Post the schematic not just a picture of the PCB

[RK]

that would help - however just looking at that antenna it seems one end of it is grounded, so I don't see how it's supposed to work at all.

@myjtag where did you find that antenna design

[Roger Clark]

@RK

Yes. It does look like either its connected to GND or supply.

[RK]

so I looked up inverted F antennae and indeed they are supposed to be grounded at one end. I don't think I'm ever going to understand how antennae work, not ever. We need abystomalabs or someone from Nordic who understands this stuff.

[Roger Clark]

AFIK, a quarter wave distance away from a short is open circuit, so its possible that this is correct.

However if the length is not quite a quarter wave, it will exhibit some lower impedance than a open circuit. Quiet what impedance is hard to calculate.

(Also the term "length" depends on a load of factors and not just the length of the track on the PCB)