Dear Colleagues,

Recently, considerable RF R and Ds in both industry and academia have been moving towards millimeter-wave, sub-THz, and THz regimes. There has been great potential observed using recent nanodevices, such as Si CMOS, SiGe HBT, III-V devices (HEMTs, HBTs), 2-dimensional nanodevices, and nano optical devices, to realize integrated circuits for low-power consumption, array implementations, and higher output power. However, lots of researchers are still investigating the technical feasibilities as to whether these frequencies could be practically deployed for commercial purposes in the near future. Significant motivations behind these ambitious R and Ds are the exploitations of such high frequencies for next-generation mobile technologies, 6G, and high-precision radar and sensor applications. Through intensive and concentrated efforts, technical bottlenecks have been identified, overcome, and gradually improved, e.g., output power. In addition, packaging is of great concern for ensuring low cost, maintaining reproducible RF performances. Several different packaging materials and concepts have been reported and demonstrated successfully. Nevertheless, a path for commercialization seems some distance away, with respect to the degree of integration, cost, footprint, and reproducible RF performances, etc.

This Special Issue will include various multi-disciplinary efforts in both electronics and optics to make millimeter-wave, sub-THz, and THz technologies key enablers for next-generation mobile, radar, and sensor technologies. We will not limit submissions to those areas only, so a broad ranges of R and D regarding these frequencies will be considered for publication in order to open a public door for next-generation technologies using nano-scale devices.

Dr. Jung Han Choi
Dr. Dong-Woo Kang
Guest Editors

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• devices and circuits for millimeter-wave, sub-THz and THz
• optic and optoelectronics technologeis
• Si, III-V devices, 2-dimenstional devices
• pakagings (material, assembly, etc.) for millimeter-wave, sub-THz and THz
• new emerging concepts: devices, circuits, sub-systems, etc.