Design of Handphone Wireless Charger System Using Omnidirectional Antenna

Handphone is not yet fully portable, because when charging still using a cable. 3.Transmissionof power to charge handphone in circulation today, still use an antenna with radiation is still in one direction that is towards the top, if it was shifted or moved, the transmitted power will be disconnected. 1.3.Relevant Literature The project to transmit electrical power without any wires, with a smale scale by using solar energy. The experiment design on the structure of the resonant coil used in the resonant tank to achieve a significantly high quality factor (Q) above 1000 for the Inductive Power Transfer (IPT).The experimental result show that with a primary coil Q of 1200, the proposed IPT system allows power to be transferred at a maximum air gap distance to coil diameter ratio of 1.46 for a highest efficiency of 87% at the resonant frequency at 106 KHz [3]. The research makes a device that can send power wirelessly (wireless power transfer) with the principle of induction magnetic resonance, with three main parts, that is sources of direct current with the output voltage of 12V DC, the transmitter circuit which consists of a ACvoltage generator circuit with high frequency of about 1,324 MHz, which will transmit the power to the receiver circuit via transmitting antenna shaped loop, and the receiver circuit consist of an LC circuit with a resonance frequency that is equal to the transmitter circuit, receive induction magnetic resonance of the transmitter circuit for receiving power which will be channeled towards the load with the results of the output voltage of ± 3V. Inductance of the antenna is calculated using equationwith the permeability of free space (g0) = 4n10-7, number of turns (N) = 6, coil diameter (d) = 4.8 cm (r = 2,4 cm), inner core area (nr2) = 18.08 · 10-4 m2, and length of the coil (l) = 0.5 cm (5 · 10-3m) is as follows ... [...]the results of inductance calculation is 16.35 gH, approaching inductance measurement results 10 gH with a difference of 6.35 gH.