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对微带型幅度均衡器进行了理论分析和计算机仿真。微带型均衡器由微带谐振器上加载电阻构成,电阻的引入有效地展宽了频带。通过优化支节的长度、宽带和电阻的阻值,得到满足要求的均衡器。利用这种均衡器,对采用两级毫米波宽带MMIC的放大器进行了增益修正,使增益平坦度得到有效改善,同时对噪声的影响也较小。采用幅度均衡器最终实现的低噪声放大器在频率范围26.5～40 GHz内,增益为26.5～28.5 dB,增益平坦度优于±1.5 dB,噪声小于3.3dB,输入输出端口驻波小于2.0,输出1 dB压缩点功率大于10 dBm。
The theoretical analysis and computer simulation of the microstrip amplitude equalizer are carried out. The microstrip type equalizer is made up of the loading resistor on the microstrip resonator, and the introduction of the resistor effectively broadens the frequency band. By optimizing the length of the stub, the resistance of the broadband and the resistor, an equalizer meeting the requirements is obtained. With this equalizer, a gain correction is applied to an amplifier using two stages of millimeter-wave wideband MMICs, so that the gain flatness is effectively improved and the influence on the noise is also small. The LNA with amplitude equalizer achieves a gain of 26.5-28.5 dB in 26.5-40 GHz frequency range with gain flatness better than ± 1.5 dB, noise less than 3.3 dB, input-output port standing wave less than 2.0 and output 1 dB compression point power is greater than 10 dBm.