A compact uni-planar printed slot UWB antenna with reconfigurable functionality

In this article, a compact uni-planar printed slot antenna with SAS geometry is proposed, facilitating UWB multi-bands, band-rejectionality, LP and CP using reconfigurable technique, with 2 x SMD diodes. For SMD1-ON, SMD2-ON, states antenna operates in SAS mode from 2.4-10.6 GHz and for SMD1-OFF, SMD2-OFF states antenna operates in slot mode, resulted in band-rejection from 2.7-4.3 GHz. For aforementioned states +/- 45 degrees LP patterns are observed. At [(SMD1-OFF, SMD2-ON) and (SMD1-ON, SMD2-OFF)] states, the antenna asserts CP with minimum 3-dB axial ratio at 6.05 GHz and 9.31 GHz, respectively, where the polarization sense is electronically reversed asserting dual-sense CP. Additionally, it shows band-rejection from 2.5-5 GHz for (SMD1-OFF, SMD2-ON) state and 3.6-4.8 GHz for (SMD1-ON, SMD2-OFF) state. A prototype antenna of size 0.208(2.4 GHz) x 0.208(2.4 GHz) x 0.012(2.4 GHz) is fabricated and measured to be potentially used in cognitive radio systems and UWB applications.