**5. Conclusion**

With the desire to improve the resolution of AoA-based indoor positioning system, this chapter has focused on the design of multi-port phased array antenna using the reflection type phase shifter. The studies demonstrate that the beamforming array antenna with two-way Wilkinson power divider that is able to limit the loss and increase the isolation between the output ports. In addition, the important part in the array, the reflection type phase shifter, can continuously control the phase shift in full 360**°** range with low insertion loss and small variation. The main beam of the array antenna can be steered in direction from 45 to 45°

with high resolution. This design can be commercially available for WLAN communication system in the frequency range from 2.424 to 2.484 GHz. This will facilitate an effective solution for indoor positioning system with high accurate localization. The future work will involve incorporating the phased array antenna for real positioning system for indoor object localization.

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