Dual band reconfigurable slot antenna with high frequency ratio

In this paper, a design of compact dual band reconfigurable slot antenna is presented. The dual band operation is realised by effectively changing the slot electrical length using solid state shunt switches. Two resonant frequencies are obtained with the frequency ratio of 2:1. Although the ratio is high, good matching is achieved on both resonant frequencies without the need for a reconfigurable matching network. Also, radiation pattern, polarisation and efficiency remain reasonable similar at both frequencies. Computation results are confirmed with the experimental results.