Multi-port Multi-band Small Antenna Design

In this paper, a novel multi-port, multi-band small planar antenna is presented. It has three input ports; each of them has their own frequency bands, 2.4 GHz, 3.5 GHz and 5.5 GHz. These three antennas are printed on a small area, 250 mm². The proposed antenna is printed on a cheap organic material substrate with other RF components. It requires enough isolation among the antennas since each frequency band ought to operate at the same time. Polarizations of monopole antennas are all orthogonal as best as possible to minimize mutual couplings and open stubs are used at feed points to block the other frequency band signals. The antenna proposed in this paper is a solution to the onboard configuration of handset system needed multiple wireless services and they can be used simultaneously.