The rapid evolution of wireless communication technologies has spurred significant interest in terahertz (THz) frequencies as a key enabler for next-generation 5G and 6G wireless communications and mobile networks. THz antennas are critical for leveraging these high-frequency bands, offering unprecedented data rates, ultra-low latency, and enhanced spectral efficiency. This chapter provides an overview of various types of THz antennas designed for wireless applications, with a focus on their unique design requirements, fabrication techniques, and performance characteristics. Key topics include advances in antenna design, miniaturization, fabrication methods, and integration with electronic components. Additionally, the chapter explores the role of THz antennas in enabling essential array technologies, underscoring their transformative potential in next-generation wireless communication systems. Furthermore, the design details and fundamental characteristics of new THz antennas are discussed extensively, complementing and reinforcing the insights presented.