| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 89 === This thesis describes the HEMT frequency multiplier design and filter design at millimeter-wave frequency. HEMT frequency multipliers include a monolithic 42-to-84 GHz doubler, a monolithic 14-to-42 GHz tripler, a monolithic 31-to-94 GHz balanced tripler, and a monolithic 19-to-76 GHz balanced quadrupler. Filters are designed for a local multi-point distributed service (LMDS) system. The 27.35~28.35 GHz filter is used at receiver-end and the 31~31.3 GHz filter is used at transmitter-end.
For the millimeter-wave frequency band, monolithic microwave integrated circuit frequency multipliers are designed with microstrip line configuration. The MMIC frequency doubler and triplers are fabricated on 4-mil-thick GaAs substrates using 0.1-μm InGaAs/AlGaAs/GaAs PHEMT technology provided by commercially available foundry service, which is accessed through the Chip Implementation Center of National Science Council of Taiwan.
The MMIC balanced frequency quadrupler is fabricated on 4-mil-thick GaAs substrates using 0.15-μm InGaAs/AlGaAs/GaAs PHEMT technology. In order to prove the balanced configuration that can suppress the second harmonic signal by phase cancellation nature, a hybrid circuit was implemented on FR4 substrates using PHEMT devices, respectively.
The filters for a LMDS system are manufactured on Al2O3 substrates with microstrip coupled line configuration. The box resonance are observed by the measurement of both receiver-end and transmitter-end filter with different box height. Hence, housing effect should be considered in the beginning of filter design. Besides, the simulated results of both Rx and Tx filters are close to measurement.
|
|---|
