Phased array antenna for the application of device free localization in indoor environments

In an era of technological advancement, device free localization (DFL) is one of the most widely researched area. In this paper, we present a cost effective RF based device free localization technique in indoor environments. Focus of this work is to design a low cost antenna for indoor localization and also to improve localization accuracy. For this purpose microstrip patch antenna phased array is designed, which is capable to exploit angle of arrival (AOA) and received single strength (RSS) measurement to localize the target in an indoor environment. Phased array is designed using the concept of delay transmission line to radiate in ±30° in the ISM band (2.4GHz to 2.5GHz). Phased array is consisting of 4 rectangular microstrip patch antennas which are fed by a T-junction power divider. A scenario is being proposed which shows the use of phased array for the application of device free localization. It is expected that by augmenting AOA with RSS, performance of the proposed system will be more reliable than the traditional RSS based systems. To reduce the cost of antenna FR-4 laminate is used. CST is used for the simulation purpose and results are shown and discussed.