Small monopole antenna with corner modified patch for UWB applications

A new form of the microstrip-fed UWB printed monopole antenna with corner modified radiating plane is proposed. Four slots with same arc radius are introduced on the four corners of the square patch, which provides a wide usable fractional bandwidth of more than 122% (3.1-12.85 GHz). The proposed antenna is simple and small in size as it is designed onto an inexpensive FR4 substrate with an overall dimension of 18 × 25 mm². In this paper the effects of slots insertion, slot radius variation and gap variation between patch and ground plane are studied with the help of simulated results. Simulated results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range.