Bandwidth Enhancement of Wideb and Sensor Using Triangle-to-Oval Patch Geometric Change for EMC Measurement

This paper deals with the bandwidth enhancement of ultra-wideband (UWB) planar monopole antenna proposed as an electromagnetic sensor for electromagnetic compatibility (EMC) measurement. The patch of monopole antenna on the sensor takes initially a geometry of inverted isosceles triangle. This geometry is then changed over into an oval, called as triangle-to-oval patch geometric change, by utilizing the relationship between the isosceles triangle and the ellipse to enhance the bandwidth characteristic. In a series of optimization processes, the degree of curvature and optimum configuration are investigated. The investigation results show that the sensor with an oval patch has better performance on the reflection coefficient. A good agreement on the bandwidth response is achieved between simulation and measurement in the frequency range of 3.06 GHz to 19.51 GHz. Furthermore, the sensor has an average measured gain of 3.90 dBi with the maximum gain of 6.57 dBi at the frequency of 19 GHz.