I'm using the CC2540DK-Mini kit and I noticed a slight difference on the antenna used on the USB Dongle and on the Keyfob. The final leg on the Keyfob antenna looks shorter than the one on the USB Dongle.
Is there any reason for that?
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I'm using the CC2540DK-Mini kit and I noticed a slight difference on the antenna used on the USB Dongle and on the Keyfob. The final leg on the Keyfob antenna looks shorter than the one on the USB Dongle.
Is there any reason for that?
The resonance frequency of the antenna will be dependent on:
- The casing
- The ground plane
In this case the keyfob has a plastic casing and the dongle not. The plastic shift the frequency down hence the the antenna is made shorter on the keyfob.