A Multiple Resonant Frequencies Circular Reconfigurable Antenna Investigated with Wireless Powering in a Concrete Block

<div>Directivity of the CRA for the fourth iteration at 8.44 GHz.</div>

International Journal of Antennas and Propagation

Figure 20: A Multiple Resonant Frequencies Circular Reconfigurable Antenna Investigated with Wireless Powering in a Concrete Block 