DESIGN AND ANALYSIS OF LOW POWER MINIATURE TYPE ULTRA WIDE BAND TRANSMITTER FOR MEDICAL APPLICATION

Abstract

Recently, there has been a surge in demand for biomedical devices that can continuously monitor essential life indicators including heart rate variability (HRV) and breathing rate etc. This ideal device would be small, wearable, wireless, networkable and low-power, allowing for vital sign monitoring. The impulse radio-based ultra-wideband (IR-UWB) technology is a promising technology that can meet these requirements. IR-UWB has received a lot of attention after Federal Communications Commission (FCC) approved the 3.1GHz-10.6GHz frequency band in 2002. To represent information, IR-UWB uses incredibly narrow Gaussian monocycle pulses or any other type of short RF pulse. IRUWB system does not necessarily require carrier signals is one of its most appealing features. In light of these advantages, this research proposes a new ultra-wide band (UWB) transmitter system based on impulses with low power consumption and a simple architecture. The illustrated UWB transmitter consumes low-power and generates a 359.44 mV output pulse swing with a pulse width of 100 ps for the Gaussian monocycle pulse. Due to its increased output voltage and low power consumption when compared to other circuits, the given topology is functional and suitable for use in medical applications and short-range wireless communication.For Ultra-wide band (UWB) communication applications a low cost, miniature size coplanar waveguide (CPW) fed ultra-wide band (UWB) antenna is also proposed which is ideal for UWB applications and has return loss less than -10db from 3GHz to 10.6GHz. To accomplish the UWB bandwidth, design characteristics have been optimized. The proposed antenna is a simple coplanar wave guide (CPW) fed aperture antenna where the concept of modified ground plane is applied to enhance the bandwidth and it is compatible with the designed UWB transmitter.