What is the best way to impedance-match a simple, resonant loop antenna (intended for transmission) to a 50 ohm amplifier?
Assume that the antenna is:
- circular, with a circumference equal to the design frequency
- resonant at 2 GHz
- constructed from copper magnet wire, side-fed by semi-rigid coax
I have read that when the perimeter matches the signal wavelength, the antenna impedance is entirely real. But what is it? Simply the resistance of the antenna wire? If that's the case, should I measure the resistance of the antenna wire, and then insert a series resistor to bring the total real impedance to 50 ohms?
Or must I use a stub tuner and a signal analyzer? Or something else?