Abstract-We report the results of a high-output power unbalanced tripler at 225 GHz, in which a pair of discrete Schottky varactor chips in parallel is adopted. Considering the present situation of domestic processing technology, the advantage of unbalanced structure is that it could provide bias to the diodes without a on-chip capacitor, which is essential in the balanced tripler scheme. The whole circuits are built on a 50 µm-thick quartz substrate, and the novel field-circuit method is applied to the design process that enables us to calculate the impact of the parastics. The measured results indicate that the output power is more than 7 dBm in 215∼228 GHz, and the output power is 12.3 dBm at 224 GHz when driven with 23.8 dBm of input power at room temperature. In general, this tripler has important practical value.
A new-type of Cr12MoVNbRE die steel was designed and investigated. The phase transition temperature was measured by dilatometer. Effects of austenizing temperature and time on the microstructure and mechanical properties of the Cr12MoVNbRE die steel were studied. The results show that the hardness decreases with the increasing austenitizing time. As for the austenitizing temperature, it increases firstly, and then decreases when the austenitizing temperature increases. The most suitable austenitizing temperature and time are 1010 °C and 20 min respectively. The high hardness of the Cr12MoVNbRE die steel is mainly attributed to the martensite with high alloy content and fine uniformly dispersed carbides.
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