Characterization of circular spiral patch for wireless charging radiator

This paper presents wireless charging radiator design based on electromagnetic coupling resonant. The radiator which is developed based on microstrip technology is expected to work at center frequency of 13MHz. A circular spiral patch has been implemented to accomplish the specifications. Prior hardware realization, the performance of radiator is investigated through simulation. The optimum design for fabrication which is selected based on simulation result have dimension less than 50mm × 65mm, 2890.17mm patch length, 0.3mm patch width, and 0.3mm gap between patch. The experimental measurement is carried out to demonstrate the performance of two radiators as a wireless charging system, one as transmitter and another one as receiver. From simulation result, the radiator works at frequency of 13MHz and has 5n parameter value of -4.096dB. Meanwhile the resonant frequency and parameter value of realized radiator are 13.2MHz and -3.53dB, respectively.