ABSTRACT
In recent years,
wireless smart systems have rapidly emerged in areas such as healthcare and
activity monitoring with applications in outpatient monitoring and the
provision of in-home lifelines for the elderly. Wireless sensor motes operating
in the 433 MHz industrial scientific and medical (ISM) band are a popular
choice for low data rate applications and provide a good communication range due
to reduced body absorption when compared to higher frequencies. Small and
lightweight sensor realisations are key constraints for unobtrusive monitoring
and an example of a 433 MHz sensor device is presented in measuring 25 mm2 in
size excluding the antenna. A λ0/4 resonant antenna at 433 MHz would require
dimensions of ∼170 mm excluding
a ground plane.
Proposed System:
To
designs a compact, planar antenna operating at 433 MHz for wireless smart
systems printed on a low-cost FR4 material. Significant size reduction can be
achieved using a square-spiral section and rectangular patch element. For the
intended application, the goal is to realise a wrist-worn sensor with an area
of 5 0× 30 mm2.Sensor and radio transceiver electronics can be
accommodated above the ground plane.
No comments:
Post a Comment