A room-temperature, low-impedance and high-IF-bandwidth terahertz heterodyne detector based on bowtie-antenna-coupled AlGaN/GaN HEMT. (1st February 2023)

• Record Type: Journal Article
• Authors: Ding, Qingfeng; Zhu, Yifan; Xiang, Lanyong; Zhang, Jinfeng; Li, Xinxing; Jin, Lin; Shangguan, Yang; Sun, Jiandong; Qin, Hua
• Is Part Of: Applied physics express. Volume 16:Number 2(2023)
• Publication Date: 2023-02-01
• Subjects: AlGaN/GaN HEMT -- terahertz -- heterodyne -- bowtie antenna -- intermediate-frequency bandwidth -- field-effect transistor; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/acb4de
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: In this paper, a 330 GHz terahertz heterodyne detector based on bowtie-antenna-coupled AlGaN/GaN high-electron-mobility transistor (HEMT) is designed and demonstrated. The bowtie antenna and a silicon lens couple the terahertz wave into a transmission line, in which the HEMT's channel generates both self-mixing and heterodyne signals. Compared to field-effect detectors without front low-noise amplifiers and output impedance matching, this detector boosts the intermediate-frequency (IF) bandwidth to 2.9 GHz due to a low output impedance of 505 Ω while maintaining a comparable sensitivity. With further sensitivity enhancement, such detectors would be developed into room-temperature, high-sensitivity, and high-IF-bandwidth heterodyne arrays.