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基于带线环形器的非互易负群时延电路
陈文兵
0
(中国西南电子技术研究所,成都610036)
摘要:
负群时延电路(NGDC)在诸多工程技术领域拥有广泛的应用前景。针对当前无源非互易负群时延电路的研究空白,提出了基于带线环形器的负群时延电路。从带线环形器等效电路的S参数出发,通过数学分析指出环形器具有正向群时延为正、反向群时延为负这一非互易特征;负群时延值与环形器端口等效输入电纳的斜率成正比,与等效输入电导成反比。为验证理论计算,设计并加工制作了一个中心频率为2.05 GHz的三角形带线环形器,并对其性能进行了测试。测试的正向群时延为0.7 ns左右,反向负群时延最大为-0.9 ns,负群时延带宽超过400 MHz。测试数据验证了数学分析,可为研究环形器组成的非互易负群时延电路提供一定的参考。
关键词:  负群时延  非互易负群时延电路  带线环形器  等效电路  S参数
DOI:
基金项目:
Non-reciprocal negative group delay circuit with a stripline circulator
CHEN Wenbing
()
Abstract:
Negative group delay circuits(NGDCs) have wide applications in many technical and engineering areas.To fill the gap in passive and non-reciprocal NGDC researches,the NGDC composed of a stripline circulator is proposed.Mathematical analysis of the S parameters of the circulator′s equivalent circuit reveals that the stripline circulator possesses such non-reciprocity that its forward group delay is positive and reverse group delay negative.The negative group delay(NGD) value is proportional to the equivalent input susceptance slope and inversely proportional to the equivalent input conductance.A triangular stripline circulator centered at 2.05 GHz is designed,fabricated and evaluated to verify the theoretical calculation.A positive group delay of about 0.7 ns is obtained in the forward direction and the maximum NGD in the reverse direction is -0.9 ns,with NGD bandwidth exceeding 400 MHz.The measured results validate the mathematical analysis,which provides some references for the study of non-reciprocal NGDC with a stripline circulator.
Key words:  negative group delay(NGD)  non-reciprocal NGDC  stripline circulator  equivalent circuit  S parameter
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