IMPLEMENTATION OF INDOOR POSITIONING AND TRACKING SYSTEM USING WSN IN MICROSTRIP WIDE STOPBAND LOWPASS FILTER

A microstrip lowpass filter is created using a stepped impedance resonator. Compact structure, low insertion loss, and a wide stopband were proposed for this filter. The substrate of this filter is FR-4 Epoxy, which measures 18mm x 15.5mm in length and width. This filter is constructed on a lowpass T-shaped resonator with a wide stopband, which produces in a convenience size and low insertion loss LPF. The most common frequency bands are L band range (1-2 GHz), S band range (2-4 GHz), C band range (4-8 GHz), and so on. This study focuses on the S band frequency since the LPF is a key element in wireless communication systems. The passband bandwidth of the LPF is 2.78 GHz to 3GHz, while its cut-off frequency is 3GHz. It has a reflection coefficient of less than 16.5 dB and an transmission coefficient compared with fewer than 0.9 dB. This technique can be used to create a WSN (wireless sensor network) for indoor positioning and tracking. The simulation and measurement results are presented.