Coupled Resonators Based Miniaturized Bandstop FSS for Broadband High Gain Reflectarray Antenna at Millimeter Wave 5G Communication Band
Soumik Dey, Sukomal Dey
Abstract
High gain broadband reflectarray antenna (RA) using novel frequency selective surface (FSS) has been shown here for millimeter (mm) wave band wireless communication. A 25×25 array of the FSS is arranged periodically to realize the reflecting surface. The geometry of the FSS consists of edge-connected dipoles (ECDs) at the unit cell's bounday and a cross-loop resonator (CLR) at the center. The Filter characteristic is evaluated for normal and oblique angles through numerical simulation. FSS exhibits bandstop resonance at 28 GHz with <tex>$s_{2l} < -10\text{dB}$</tex> stopband bandwidth (BW) between 25.28 to 29.62 GHz (4.34 GHz or 15.8 %). A conventional Ka-band pyramidal horn antenna is placed in a prime focus position to illuminate the reflecting surface. Radiation from the horn makes a plane wave after being reflected from the FSS and enhances the directivity of the primary feed. The designed antenna displays a broadside pencil beam radiation pattern with a gain of 21.8 dBi at 28 GHz. In two ortho-normal planes (: E and H-plane)., 3 dB beamwidth of the antenna is < 7.4°.