A broadband power amplifying metasurface with polarization conversion

This paper proposes a broadband power amplifying metasurface with polarization conversion (PC-PAM). The metasurface is composed of a circular radiating patch on the top, a bowtie slot in the middle and a microstrip feed line backed with a ground plane on the bottom. To minimize the number of amplifier chip used, four elements (2 x 2) share one amplifier chip and they are connected by the T-shaped power dividers to form a subarray. Next, four sub-arrays are constructed with corresponding feed network for 4 x 4 elements. Measured results show that the proposed metasurface can convert polarization of incident wave and amplify the power of reflected waves by 2.4 dB-7.8 dB in the frequency range of 4.8 GHz-6.0 GHz with a relative bandwidth of 22.2%. Compared with conventional polarization converting metasurfaces, our proposed design can perform polarization conversion while amplifying the reflected power simultaneously, which can be applied in enhancement of wireless signal coverage.