We propose a quartz-supported frequency selective surface (FSS) for 6G communication, featuring a gear-shaped metallic array on a single layer. The transmission characteristics are investigated using full-wave simulation and the equivalent circuit method. Additionally, the surface current distribution, electric field, and magnetic field distributions are studied to better understand the transmission mechanism The simulation results show that a resonant frequency of 16.63 GHz can be achieved with an attenuation of -80 dB. The transmission response of the FSS prototype was measured using a free space setup, and the measured results matched well with the simulated ones, confirming the design and fabrication reliability. The proposed FSS, with its simple structure, low cost, easy fabrication, and integration advantages, can enhance communication performance and anti-interference capabilities in future 6G system. Keywords: 6G; communication; frequency selective surface; circular loop; Transmission; Square Loop.