- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Deeply-scaled GaN-on-Si high electron mobility transistors with record cut-off frequency <i>f</i><sub>T</sub> of 310 GHz
摘要： A deeply-scaled GaN-on-Si high electron mobility transistor (HEMT) with a record-high cut-off frequency (fT) of 310 GHz has been demonstrated. The device has an InAlN/GaN heterojunction structure, a source-drain spacing of 400 nm, and a gate length of 40 nm. The device exhibited a high drain current of 2.34 A/mm, a peak transconductance of 523 mS/mm, and a gate-to-drain breakdown voltage (BVgd) of 15 V. A Johnson’s figure-of-merit (FOM = fT × BV) of 4.65 THz·V has been achieved, which is comparable to those reported in GaN-on-SiC. These results indicate GaN-on-Si transistors are promising in low-cost emerging mm-wave applications.
关键词： mm-wave applications,GaN-on-Si,HEMT,high electron mobility transistor,cut-off frequency
更新于2025-09-11 14:15:04
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[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - Waveguide Coupler Design Method for Permittivity Measurement at millimeter-wave applications
摘要： In this paper, novel waveguide coupler technique for relative permittivity measurement of dielectric materials is proposed. Unlike two conventional port methods measurements, this technique provides extra information to precisely measure tangent loss and permittivity. This type of coupler is composed of a waveguide section of four arms connected by a central junction. Quasi-optical coupler technique is realized on standard waveguide by simply inserting circular holes with different values of permittivity in the central section to act as a mirror. Characteristics of the proposed coupler are introduced and studied with regard to different parameters. This design provides an precise technique for measuring permittivity and tangent loss throughout two extra ports. A prototype at mm-wave is designed, fabricated and measured. Experimental results show that the proposed waveguide coupler has accurate measured results of permittivity for milk 2 % and creamer 10 %.
关键词： Permittivity measurements,Waveguide coupler,millimetres wave applications,Four ports devices
更新于2025-09-11 14:15:04