Progress in wireless communication requires antennas that work on multi-band simultaneously. This paper presents a design method for a multi-band antenna using printed dipole with L-slots fed by a single coaxial cable. Using this method, a triple-band antenna that operates at 868-915 MHz for RFID (radio frequency identification), 1575 MHz for GPS (global positioning system) and 2.45 GHz for BLE (bluetooth low energy) was designed and manufactured. The antenna's parameters for triple-band operation are investigated and discussed. In this antenna design, ANSYS HFSS software using highly accurate finite element method (FEM) simulation is employed to analyze the entire structure. The designed antenna is manufactured using an FR-4 substrate with a dielectric constant (r) of 4.4 and thickness (h) of 1.6 mm. Many prototypes have been fabricated, and good agreement between simulations and measurements has been achieved. The performance of the prototypes has been measured in a standard far-field anechoic chamber. The proposed triple-band antenna is also tested by measuring the reading distance, and it is found that the proposed antenna can be used for RFID applications.