| Millimeter-Wave monolithic power amplifier is one of the most important MMIC circuits and widely used in phased array radars and satellite communications.Output power and gain are the important indicators of Millimeter-Wave monolithic power amplifier, the technology of power combining in the Millimeter-Wave monolithic power amplifier must be used to raise the output power of the monolithic power amplifier because the power of the single HEMT is limited. In this thesis, two Millimeter-Wave MMIC power amplifiers are designed with two improved power combining technology including small-sized Wilkinson and parallel matching network.The paper describes the applications,developments and characteristics of Millimeter-Wave monolithic power amplifier and power combining firstly.Then the fundamental and issues of power combining in chip are analyzed,and one of the combining networks named Wilkinson power divider is improved with capacitive loading to reduce the size of the chip,comparing to the traditional Wilkinson power divider the small-sized divider has a very compact size as well as good match and isolation.The last part of the paper is the design of the power amplifier.The process of the circuit design are elaborated.Two MMIC Power amplifiers are designed with different technologies and power combining networks,the first one uses small-sized Wilkinson technique,its output power is more than 2W and gain is about 16.1dB,PAE is about 22% in the bandwidth of 30-34GHz.The size of the chip is 3.15mm x 2.88mm and is relatively small in the reported three-stage MMIC amplifiers.The second one uses Wilkinson structure as power splitter and parallel matching network as power combiner,its output power is more than 1W and gain is about 15dB,PAE is about 32% in the bandwidth of 32.5-35.5GHz.The Layout and the EM simulation results of the two MMIC power amplifiers are presented.The simulation results and how isolation resistor influences the power combining are analyzed. |
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