Article
Engineering, Electrical & Electronic
Gabriel Guimaraes, Patrick Reynaert
Summary: A novel 670 GHz terahertz source array has been proposed and implemented in 40-nm bulk CMOS technology, achieving high frequency and power. The compact and scalable oscillator-radiator topology working on the third harmonic is introduced to enhance the source performance. By utilizing a filtering feedback network and integrating various coupling mechanisms, the signal radiation is achieved effectively while the loading issue of the resonator is suppressed.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2021)
Article
Engineering, Electrical & Electronic
Liang Gao, Chi Hou Chan
Summary: This study proposes a novel and compact 2-D scalable architecture of coupled harmonic oscillator array for high-power radiation beyond 600 GHz. Experimental results demonstrate the highest radiated power, radiated power per area, EIRP, frequency tuning range, and dc-to-THz efficiency among silicon-based scalable coherent radiator arrays operating beyond 600 GHz.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2022)
Article
Optics
Xiang Gao, Huanxin LI, Ting Zhang, Jia Du, Ken Smart, Jianjun Ma, Jianping An
Summary: This paper presents a 600 GHz high-temperature superconducting sub-harmonic mixer with a double-Y-type slot antenna and a cascaded filter network. The experimental results show that the mixer achieves the best performance among similar frequency and operating temperature conditions.
Article
Optics
Zhen Huang, Zhaofeng Li, Hui Dong, Fuhua Yang, Wei Yan, Xiaodong Wang
Summary: A novel broadband slot-spiral antenna integrated with HEMT THz detectors was studied for its performance at 150-450 GHz, showing better transmission efficiency and miniaturization capability compared to spiral antennas. The responsivity formula derived from transmission line principle and antenna theory indicated correlation between detector responsivity and antenna absorptivity, providing guidelines for HEMT THz detector design and demonstrating excellent application prospects for slot-spiral antennas in THz detection and imaging.
Article
Chemistry, Analytical
Xiaohang Li, Wenfei Yin, Salam Khamas
Summary: The proposed slot fed terahertz dielectric resonator antenna driven by an optimized photomixer shows significant improvement in optical to THz conversion efficiency and offers a radiation efficiency of over 90%. By enhancing the surface electric field of the photomixer and using a traditional coplanar strip biasing network, the total efficiency has been considerably improved.
Article
Computer Science, Information Systems
Huanqian Xiong, Jiro Hirokawa, Takashi Tomura
Summary: This paper proposes a dual-polarized paralle-plate waveguide slot array antenna operating at 24.5 GHz band. The antenna achieves a simulated radiation efficiency of over 95% and an impedance bandwidth of 13%. The prototype antenna has a measured peak antenna efficiency of 40% and a measured XPD exceeding 26 dB.
Article
Engineering, Electrical & Electronic
Liang Gao, Chi Hou Chan
Summary: This article presents a novel coherent, scalable radiator array achieving the highest effective isotropic radiated power (EIRP) and highest dc-to-terahertz (THz) efficiency among silicon-based scalable THz sources beyond 400 GHz through co-design and optimization methods of the THz power generation and radiation. By optimizing the THz power generation and radiation and introducing a low-cost Teflon lens, a highly directive beam is achieved. Additionally, a 2-D scalable coupled harmonic oscillator array is proposed for the excitation network, optimizing second-harmonic generation and providing high output power and efficiency.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2022)
Article
Instruments & Instrumentation
Xu-hao Zhao, Meng-qi Liu, Yun-fei Sun, Liang Xu, Qiang Zhang, Cheng-Wei Yuan, Jian-de Zhang
Summary: This paper presents a beam scanning antenna based on an all-metal lens for high-power microwave (HPM) applications. By rotating the cross-slot on the lens elements, a full transmission phase range of 360° can be achieved with a transmission efficiency of over 99%. The low-power and high-power tests demonstrate that the designed antenna can realize beam scanning within a certain cone angle and has low side lobes and reflection coefficients. The designed lenses also have a bandwidth of over 100 MHz, indicating great potential for application.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Analytical
Xu Wang, Ting-Peng Li, Shu-Xia Yan, Jian Wang
Summary: This paper presents the operation principle, module designs, theoretical analysis, and experimental validation of a room-temperature CMOS monolithic resonant triple-band THz thermal detector. The detector consists of a compact triple-band octagonal ring antenna and a sensitive PTAT sensor, showing advantages of room-temperature operation, low cost, easy integration, and mass production. Good experimental results are obtained, providing great potential for multiband THz sensing and imaging systems.
Article
Engineering, Electrical & Electronic
Yilin Feng, Lidan Cao, Yan Zhang
Summary: A device based on slot antennas has been designed to stimulate terahertz SPPs and control their wave front simultaneously, which can simplify the design and fabrication of integrated SPPs devices. Adjustment of geometric parameters allows for phase modulation and improved conversion efficiency of terahertz propagating waves into surface waves.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Rui-Sen Chen, Lei Zhu, Sai-Wai Wong, Xu-Zhou Yu, Yin Li, Long Zhang, Yejun He
Summary: By proposing a simplified feeding structure, a low-sidelobe cavity-backed slot antenna array was designed to achieve in-phase and nonuniform amplitude excitation without using power dividing network, simplifying the antenna structure significantly. The full-metal structure of the antenna provides a high power-handling capacity, and the feasibility of the design was verified through simulation and measurement results.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Optics
Ke Wang, Yiming Liao, Yaozu Guo, Shuyu Zhou, Jie Liu, Feng Yan, Iaoli Ji
Summary: A novel structure utilizing a mushroom-like artificial magnetic conductor (M-AMC) is developed to suppress crosstalk between CMOS THz detectors. The M-AMC structure, designed by using metal Al and doped-Si materials, reduces the transmission coefficient of electromagnetic waves between adjacent pixels while enhancing the electric field of target pixels. Experimental results show that the M-AMC structure significantly decreases the noise equivalent power (NEP) of pixels by 315.5% at the central frequency and improves the uniformity of NEP distribution. This method effectively suppresses crosstalk and enhances the responsivity of CMOS THz detectors for high-performance THz detector arrays.
Article
Engineering, Electrical & Electronic
Yao Zhang, Yue Zhang, Kai Huang, Shao-Jie Liu, Xiu Yin Zhang, Qing Huo Liu
Summary: This article presents a general design method for reconfigurable antennas with aperture-coupled linearly polarized and circularly polarized functions. A novel double-ring-slot structure is used for improved filtering radiation performance and wideband impedance matching. By coupling with a microstrip line and using a p-i-n diode switch, the antenna can switch between LP and CP modes.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Zhou Peigen, Chen Jixin, Tang Siyuan, Yu Jiayang, Wang Chen, Li Huanbo, Lu Haiyan, Yan Pinpin, Hou Debin, Chen Zhe, Hong Wei
Summary: With the increasing number of users and emerging new applications, the demand for mobile data traffic is growing rapidly. The limited spectrum resources of traditional frequency bands can no longer support future wireless communication systems, while the terahertz frequency bands offer abundant spectrum resources for higher system capacity and data throughput. The development of silicon-based semiconductor technology provides a feasible solution for low-cost, high-stability, and easy-to-integrate THz communication systems.
CHINESE JOURNAL OF ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
Chenyu Yao, Mengjie Jiang, Dong Wang, Libo Zhang, Ning Zhang, Lin Wang, Xiaoshuang Chen
Summary: A self-mixing terahertz detector based on a hemispherical silicon lens and antenna-coupled InGaAs/AlGaAs high electron mobility transistor (HEMT) is developed, enabling wide spectrum detection and improved performance.
FRONTIERS IN PHYSICS
(2023)