幅度均衡宽带放大链路研制

发布时间：2018-06-08 05:15

  本文选题：宽带均衡低噪声放大器 + 宽带多模滤波器　； 参考：《电子科技大学》2014年硕士论文

【摘要】：随着雷达技术的高速发展,新体制雷达的不断涌现,新技术在雷达系统的深入应用,雷达侦察任务的环境越来越复杂。为了适应复杂的电磁侦察环境,侦察接收机要求覆盖整个电子战频域范围来截获各类不同的雷达信号。因此,研制接收频带宽、抗干扰能力强的雷达侦察机已成为电子信息战的必然趋势。幅度均衡宽带放大链路作为宽带雷达侦察机的核心模块,制约着电子侦察机的整体性能水平,对电子信息战的成败起着决定性的作用。链路核心组件为宽带低噪声放大器和宽带滤波器,宽带低噪声放大器决定整个系统的灵敏度以及动态范围,而宽带滤波器则能够很好的提高系统的抗干扰能力。本文在研究串联负反馈和并联负反馈原型结构的基础上,对串联负反馈微带线的长度进行了修正,采用高阻抗线替换常规并联负反馈环上的电感元件,从而改善了放大器的增益平坦度、输入输出驻波和稳定性。结合宽带匹配解析理论,舍弃了传统T型和π型匹配电路,提出了一种新型低Q值微带十字型匹配支节来拓展放大器的匹配带宽。采用电阻串联电感到地的π型幅度均衡网络,以提高低噪声放大器输出增益平坦度。最终研制的宽带均衡低噪声放大器实物尺寸为36mm×32mm×15mm,在1.5GHz-5.5GHz范围内增益为21±0.5dB,噪声系数小于1.85dB,回波损耗优于9dB,输出1dB压缩点大于10dBm。本文还采用交指耦合线馈电多模谐振器结构完成了常规结构宽带多模滤波器的设计。在常规电路结构的基础上,通过加载缺陷地(DGS)、短截线等电路结构来改变交指耦合线的电磁分布,从而提高交指耦合线的耦合强度,拓宽滤波器的通带。通过加载阶梯阻抗谐振器(SIR)、折叠开路阶梯阻抗谐振器(SIS)等电路结构,以引入传输零点,从而改善滤波器的边带滚降特性。最终研制的交指耦合线加载短截线宽带7模滤波器电路尺寸为43.6mm×9.8mm,在1.2GHz-5.15GHz范围内(预期设计通带为1.5GHz-5.5GHz,实测通带往低频偏移),插入损耗小于2.5dB,回波损耗优于15dB,带外抑制大于45dB。最终研制的幅度均衡宽带放大链路性基本达到预期的指标要求,在通带内增益为20±1dB,带外抑制大于45dB,输入输出驻波小于2。
[Abstract]:With the rapid development of radar technology, the emergence of new radar system, the further application of new technology in radar system, the environment of radar reconnaissance task is becoming more and more complex. In order to adapt to the complex electromagnetic reconnaissance environment, the reconnaissance receiver needs to cover the frequency domain of EW to intercept different radar signals. Therefore, it has become an inevitable trend of electronic information warfare to develop a radar reconnaissance plane with strong anti-jamming capability and receiving bandwidth. As the core module of wideband radar surveillance aircraft, amplitude balanced broadband amplification link restricts the overall performance of electronic reconnaissance aircraft and plays a decisive role in the success or failure of electronic information warfare. The core components of the link are broadband low noise amplifier and broadband filter. Broadband low noise amplifier determines the sensitivity and dynamic range of the whole system, and broadband filter can improve the anti-jamming ability of the system. Based on the study of series negative feedback and parallel negative feedback prototype structure, the length of series negative feedback microstrip line is modified in this paper, and the high impedance line is used to replace the inductance element on the conventional parallel negative feedback loop. Thus, the gain flatness, input and output standing wave and stability of the amplifier are improved. Based on the theory of wideband matching analysis, a new type of low Q microstrip cross matched branch is proposed to expand the matching bandwidth of amplifier, instead of traditional T type and 蟺 type matching circuit. In order to improve the flatness of output gain of low noise amplifier, a 蟺 type amplitude equalization network with resistor series is used. The size of the Wideband balanced LNA is 36mm 脳 32mm 脳 15mm, the gain is 21 卤0.5dBin the range of 1.5GHz to 5.5GHz, the noise coefficient is less than 1.85dB, the return loss is better than 9dBand the output 1dB compression point is more than 10dBm. The design of conventional wideband multimode filter is also completed by using the cross-finger coupling line-fed multi-mode resonator structure. On the basis of the conventional circuit structure, the electromagnetic distribution of the interDigital coupling line is changed by loading the defective circuit structures such as DGSN, short cut lines, so as to improve the coupling strength of the interDigital coupling lines and widen the passband of the filter. By loading step impedance resonator, folding open circuit step impedance resonator and so on, the transmission zeros are introduced to improve the sideband rolling characteristics of the filter. Finally, the interDigital coupling line loaded short-cut wideband 7-mode filter has a size of 43.6mm 脳 9.8mm. The circuit size is within 1.2GHz-5.15GHz (the expected pass band is 1.5GHz-5.5 GHz). The measured pass band is shifted to low frequency, the insertion loss is less than 2.5dB, the echo loss is better than 15dB, and the out-of-band suppression is greater than 45dB. The amplitude equalization wideband amplification link can meet the expected requirements. The gain in the passband is 20 卤1 dB, the out-of-band suppression is more than 45 dB, and the input and output standing wave is less than 2.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957
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本文编号：1994660