平衡滤波器因具有卓越的抗噪声及抗电磁干扰能力而在繁杂频谱环境下的低噪通信系统中显得至关重要。该文提出了一款具有共模抑制特性的平衡滤波器，通过差共模理论结合导纳矩阵及传输矩阵完成了分析设计。该滤波器中心频率为1.4 GHz，相对带宽可达74.3%，覆盖2G、GPRS、3G及4G LTE频段。同时该滤波器的边带具有两对传输零点，故其具有理想的边带滚降速度及边带抑制水平。滤波器全差模通频带内共模信号抑制水平均优于10 dB，差模阻带抑制优于20 dB，电路尺寸仅为0.17λg×0.17λg。

In this paper, we have proposed a metal-insulator-metal (MIM) pressure sensor which consists of two plasmonic waveguides and a double square ring resonator. The two square rings are connected via a rectangular patch located between the two of them. The surface plasmon polaritons (SPPs) can be transferred from a square ring to the other through this patch. The finite-difference time-domain method (FDTD) has been used to simulate the device. Applying a pressure on the structure, it deforms, and a red shift of 103 nm in the resonance wavelength has been calculated. The deformation is linearly proportional to the wavelength shift in a wide range of wavelength. The proposed optical plasmonic pressure sensor has a sensitivity of 16.5 nm/MPa which makes it very suitable for using in biological and biomedical engineering.

初步研究了方形谐振腔环形激光器的背向散射耦合效应。用矢量法求解了方形谐振腔镜片位置变动对腔内稳态闭合光路的长度及形状变化的影响。根据背向散射矢量耦合理论，在对闭合光路变动进行分析的基础上建立了方形无源谐振腔背向散射耦合模型。此模型可以推广应用到任意形状环形腔的背向散射耦合效应的研究。理论上得到了背向散射耦合系数振幅与谐振腔腔长变化具有双波长周期关系。理论分析表明谐振腔体初始加工径向误差对于背向散射耦合效应有巨大影响。