Dual resonant slot antennas for wireless applications

First, a qualitative relationship between the dimensions of rectangular slot antennas and their bandwidths is studied and then the design and measurement results of a dual resonant slot antenna are presented and discussed.. It is shown that, by increasing the width of a rectangular slot antenna, its bandwidth also increases. For appropriately designed microstrip-fed slots, this increase results in the creation of a second resonance with similar current distribution to that of the first, and a frequency above the first and below the second normal resonant frequencies. This phenomenon is exploited to achieve an antenna with large bandwidth and similar radiation patterns across the entire band.