Abstract-Terahertz monolithic integrated waveguide transmission lines based on wide bandgap semiconductor materials

Journal of Applied Physics

Yang Li, Xiao-Hua Ma, Lin-An Yang, Jin-Ping Ao, Yue Hao,

Geometry of the TMIW-TL and the TMIW-GCPW transitions based on the SiC substrate: (a) ideal model and (b) actual model.

https://aip.scitation.org/doi/10.1063/1.5083097

In this paper, terahertz monolithic integrated waveguide (TMIW) transmission lines (TLs) are analyzed and fabricated based on wide bandgap semiconductor materials. The ignored parameters of TLs at low frequencies, such as the via-hole shape, the titanium/gold thickness and roughness, and the micropipe effect of material, are especially investigated based on the semiconductor fabrication technique and the terahertz-wave theory. Subsequently, the fine optimized TMIW-TL and the transition to grounded coplanar waveguide are fabricated. The measurement shows that the attenuation constant of a TL is as low as 0.19 dB/λg at 220 GHz. The proposed TMIW can provide electrical performance similar to the conventional air-filled waveguide, while it has only 10% of the volume, which indicates a great potential for future terahertz integrated systems.

Abstract-Design of 3D filtering antenna for the application of terahertz

•  Yang Li ¹ ; Lin-an Yang ¹ ; Shao-bo Wang ¹ ; Lin Du ¹ ; Yue Hao ¹
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http://digital-library.theiet.org/content/journals/10.1049/el.2016.3808

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• Affiliations: 1: The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, People's Republic of China 

A new terahertz (THz) filtering antenna realised by 3D substrate integrated circular waveguide (3D-SICW) is presented. The filtering antenna is designed on a low-temperature co-fired ceramic substrate. Different from traditional planar structure, the direction of power in 3D-SICW is along Z-axis and this will significantly enhance the performance of the devices at THz frequency. The filtering antenna is constructed by two 3D-SICW cavities and a standard substrate integrated waveguide (SIW) cavity, where one SICW cavity and the standard SIW cavity form the bandpass filter by using electric coupling and the other SICW cavity is used as antenna. The results indicate that the passband of filtering antenna range from 170.4 to 177.8 GHz and the gain of antenna is about 5.7 dB. Finally, the filtering antenna is fabricated and measured to verify the simulation prediction. The measured and simulated results are in good agreement at such high frequency