Optimization of Compact UWB Monopole Antenna with Tapered Connection and Linier Tapered Transformer

A very compact UWB monopole antenna with stable radiation pattern is presented. The antenna is constructed on FR4 with dielectric constant of 4.4 and 1.6 thickness. The antenna has a bandwidth of 4.2 - 11.2 GHz. The antenna impedance adjustment process in the UWB frequency range can be adjusted by optimizing the tapered side and linear tapered transformers. The antenna structure have the same radiator and ground plane width. A partial ground plane produces an antenna with a stable omnidirectional radiation pattern for all UWB frequency bands. The antenna gain also shows very stable with a maximum gain of 3.5 dBi.