摘要
基于小反射理论,引入Klopfenstein阻抗渐变线对传统发夹型谐振器结构进行改进,设计了一种相对带宽为8%的结构紧凑型毫米波带通滤波器。采用S参数的多项式综合方法得到耦合矩阵电路模型,利用三维电磁场全波仿真软件HFSS拟合出耦合系数与谐振器间距、外部品质因数与抽头位置的关系曲线,进而提取出耦合矩阵对应滤波器的物理尺寸。实测结果表明:在28.8 GHz^31.2 GHz频带内,该滤波器的插损小于3.0 dB,回波优于-17 dB,带外抑制大于40 dB@33 GHz,测试结果与计算结果吻合较好。
A millimeter-wave microstrip bandpass filter of a 8% fraction bandwidth is presented here. It is developed from the traditional hairpin resonator structure with introducing the Klopfenstein impedance taper which is based on the theory of small reflection. First, coupling matrix model is derived with synthesis methods of Chebyshev transfer and reflection polynomials. Then the curve of coupling coefficient versus coupling spacing and the curve of external quality factor versus tap location are calculated and plotted with HFSS. Finally, the physical dimensions of the corre- sponding filter can be extracted from the results above. The test result shows that the insertion loss is less than 3 dB and the return loss is better than -17dB in the frequencies of 28.8 GHz to 31.2 GHz, besides the out-of-band rejection level is larger than 40 dB at the frequency of 33 GHz. The result matches with the simulations very well.
出处
《电子器件》
CAS
北大核心
2014年第5期855-858,共4页
Chinese Journal of Electron Devices
基金
四川省教育厅重点项目(13ZA0087)
关键词
滤波器
发夹谐振器
耦合矩阵
外部品质因数
filter
hairpin resonator
coupling matrix
external quality factor
作者简介
王文才(1987-),男,汉族,甘肃天水人,成都信息工程学院通信工程学院,硕士研究生,主要研究方向为微波射频电路与系统,haocaiww@163.com.
陈昌明(1971-),男,汉族,四川安县人,成都信息工程学院通信工程学院,副教授,硕士生导师,主要研究方向为射频、微波毫米波电路与系统.
杨刚(1988-),男,汉族,四川南充人,成都信息工程学院通信工程学院,硕士研究生,主要研究方向为微波电路设计。