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

<div>Directivity of the CRA for the second iteration at 6.55 GHz.</div>

International Journal of Antennas and Propagation

Figure 14: A Multiple Resonant Frequencies Circular Reconfigurable Antenna Investigated with Wireless Powering in a Concrete Block 