Dual-Band Topological Filter Antenna on a Silicon Chip for Terahertz Wireless Communication

Abstract

Topological edge states have emerged as a promising solution for integrated devices at microwave and terahertz (THz) frequencies due to their low-loss wave propagation characteristics. In this article, we propose an on-chip THz topological dual-band filter antenna on the silicon platform for high-speed communication, sensing, and imaging applications. The design leverages the topological phenomenon of valley photonic crystals to integrate filtering and radiating functionalities into a single structure. By carefully engineering the edge state bands, the design supports distinct frequency edge states that enable dual-band operation between 340 and 374 GHz (lower band: 340–355 GHz; higher band: 363–374 GHz) with an incorporation of an 8 GHz guard band. The single-fed filter antenna achieves a realized gain of 12 dBi at 350 GHz in the lower band and 10.5 dBi at 365 GHz in the higher band, with reduced coupling losses. The structure exhibits a flat group delay of 1 ns in free space over a wide bandwidth, making it suitable for high-speed wireless communication. This work showcases the potential of dual-band filter antenna design for 6G communication systems and THz sensing applications.