A Fabry pérot antenna with a multilayer superstrate having nonuniform unit cells has been investigated as a receiving antenna for radio frequency (RF) energy harvesting applications. Here, the primary radiator is selected as a dual‐polarized aperture coupled microstrip antenna with a double‐layer superstrate. This antenna excites orthogonal polarizations, vertical (V) and horizontal (H) in the frequency band of 6.2 and 5.8 GHz, respectively, due to the presence of two orthogonal H‐shaped slots in its ground plane. The proposed antenna provides a gain enhancement of 9.8 and 10.1 dBi at the respective frequencies. The rectifying circuit is designed for a frequency of 5.8 GHz using a voltage doubler topology. The circuit provides a power conversion efficiency of 41% at 0 dBm input power.
A coplanar waveguide‐fed metamaterial antenna is presented. The proposed antenna is composed of two‐unit cell composite right/left‐handed transmission line (CRLH‐TL) loaded with split ring resonators (SRRs) and complementary SRRs (CSRRs). The wideband characteristic is obtained by merging the three closely spaced resonances of CRLH‐TL. The loading of SRRs and CSRRs not only improves the impedance matching but also enhances the overall gain and radiation efficiency. The measured results show a −10 dB fractional bandwidth of 67% (6.48–13 GHz) with the realised gains of 2.98, 3.43, 3.15, 2.75 and 2.61 dBi at the resonant frequencies 8.3, 9.2, 10.3, 11 and 12 GHz, respectively. The radiation efficiency is above 67% over the entire band of operation with a peak value of 81.72%. The measured results agree well with the simulated results. The proposed antenna is suitable for X‐band (8–12 GHz) applications.
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