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I am working in a biomedical implant. I have to design an antenna for the wireless power transmission. The frequency that I am using is 13.56 MHz. I used some antennas found in some articles but when I test them (just the antennas) I cannot have a good performance in terms of distance and power transmission.

I used a loop antenna that I need to reduce the size until 5 cm diameter. It has to be a very little antenna (ofc, High frequency) for this communication.

Could you help me with this please! I need to know where to start or what am I doing wrong..

Kind regards!

Antennas Frequency input

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    \$\begingroup\$ Did you confirm both antennas resonate at your working frequency? The first step toward designing a wireless power transfer system is to have both Tx and Rx antenna resonance at source frequency (13.56 MHz in your case) \$\endgroup\$ – Pojj May 14 at 17:28
  • \$\begingroup\$ They are but slightly. With a 20 MHz it looks to receive more power. However, not enough. \$\endgroup\$ – Mufasa May 14 at 20:41
  • \$\begingroup\$ What power are you using and what range is required? \$\endgroup\$ – Chu May 14 at 21:57
  • \$\begingroup\$ I would require a range of less than 50 cm. Not to much. The most important part is the power because it has to cross the head bone. \$\endgroup\$ – Mufasa May 15 at 10:47
  • \$\begingroup\$ 50 cm or 5 cm? What is the power you need? Step 1. (must do) make sure antennas resonate at working frequency, Step 2. Define the distance and calculate/Simulate, mutual inductance, coil inductances, coil quality factor. Step 3. Optimize the load resistance for maximum power transfer. (or if the load is fixed, use impedance matching to maximize power transfer ) There can be alternative approaches but first step is mandatory. So start with it. \$\endgroup\$ – Pojj May 15 at 21:21

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