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

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

Gokulpriya S¹, Neeraj Krishna V², Athira Mohan R K³, Padmasine K G⁴

¹Department of Electronics and Instrumentation, Bharathiar university, Coimbatore-46, Tamilnadu, India

²Department of Electronics and Instrumentation, Bharathiar university, Coimbatore-46, Tamilnadu, India

³Department of Electronics and Instrumentation, Bharathiar university, Coimbatore-46, Tamilnadu, India

⁴Department of Electronics and Instrumentation, Bharathiar university, Coimbatore-46, Tamilnadu, India

---------------------------------------------------------------------***---------------------------------------------------------------------

Abstract - 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.

Key Words:  lowpass filter, T-shaped resonator, wireless communication, passband, wireless sensor network