gazrog
Newbie level 5
Hi Guys,
I have designed a electrically small square antenna on a piece of 0.8mm FR4 substrate (not great for this application I know) operating at 2.4 Ghz. The antennas circumference is 40mm (1/20 of 0.125 wavelength to get the radius then multiplied by 2pi to get the circumference). The antenna has a gap which acts as a capacitance to form a RLC circuit to achieve resonance so the imaginary part of the impedance is zero. The required goal is to make two and use them as near field antennas and then measure the distances that can be achieved. As expected the radiation resistance and ohmic resistance are very low, about 2 ohms give or take but still very low. I want to match the antenna to a 50 ohm line and have tried quarter wavelength transformers and single stub matching to try to achieve this but the dimensions i need for these methods seem huge for the overall size of the antenna. I have thought about using another small loop to couple the antennas together for the matching. Any other ideas or help would be appreciated.
Many Thanks
I have designed a electrically small square antenna on a piece of 0.8mm FR4 substrate (not great for this application I know) operating at 2.4 Ghz. The antennas circumference is 40mm (1/20 of 0.125 wavelength to get the radius then multiplied by 2pi to get the circumference). The antenna has a gap which acts as a capacitance to form a RLC circuit to achieve resonance so the imaginary part of the impedance is zero. The required goal is to make two and use them as near field antennas and then measure the distances that can be achieved. As expected the radiation resistance and ohmic resistance are very low, about 2 ohms give or take but still very low. I want to match the antenna to a 50 ohm line and have tried quarter wavelength transformers and single stub matching to try to achieve this but the dimensions i need for these methods seem huge for the overall size of the antenna. I have thought about using another small loop to couple the antennas together for the matching. Any other ideas or help would be appreciated.
Many Thanks