HOW TO: Build a RF Resonator Surface Coil

Design the ring(s):

1. Lay out copper tape or etch from a copper plate
2. Leave or create breaks for the capacitors
   • Try to use symmetry in the coil layout for the most homogeneity

Measure the inductance of the coil

• You can use solder to complete the connections where the caps will be

Using pick a capacitance to achieve the appropriate resonant frequency

• Other equation C = Lω²

Multiply C by the number of capacitors that are included in your circuit

• Do not include the coupling/bridging capacitor in this number of capacitors
• i.e.: if you have 1 bridging capacitor and 3 capacitors around the rest of the circuit, multiply C by 3

In parallel with one of the capacitors (not the bridging capacitor) include a variable capacitor for fine tuning

Match the circuit to the line with the bridging capacitor (generally of a larger capacitance value)