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为补偿宽带收发前端幅频响应不平坦的缺点,基于薄膜工艺,设计了一种结构紧凑的微带增益均衡器。设计中综合考虑了幅频响应均衡要求及阻抗匹配等因素,在薄膜电阻(加载在谐振枝节上的吸收结构)与主传输线之间增设了高阻微带线,以减小对阻抗匹配的恶化。为了便于小型化集成,高阻微带线弯曲成S形,开路微带枝节弯曲成U形,均衡器垂直主线方向的长度仅为原来的44%。实物测试在24.6 GHz~26.7 GHz频带内,回波损耗小于-17.4 d B,均衡量约为-6 d B,与仿真结果相符度良好,证明此设计方法可靠实用。
In order to compensate for the shortcomings of unbalanced amplitude-frequency response at the front end of wideband transceivers, a compact microstrip gain equalizer is designed based on thin film technology. Considering the requirements of amplitude-frequency response balance and impedance matching, the design adds a high-impedance microstrip line between the thin film resistor (the absorption structure loaded on the resonant branch) and the main transmission line to reduce the deterioration of the impedance matching . In order to facilitate miniaturization, high-impedance microstrip lines bent into S-shaped, open microstrip bent into a U-shaped, equalizer vertical main line length of only 44% of the original. The physical test shows that the return loss is less than -17.4 dB in the frequency band from 24.6 GHz to 26.7 GHz and the equalization is about -6 dB, which is in good agreement with the simulation results, which proves that the design method is reliable and practical.