基于子空间的阵列天线幅相误差校正算法

基于子空间原理提出了一种用来校正阵列天线增益和相位误差的算法。该算法需要一个校正源。由于校正源的方位角有时可能难以直接测量,因此通过旋转阵列天线来代替移动校正源的方位从而获得校正源位于不同方位角时的输入协方差矩阵,并通过交替迭代运算求出阵列天线增益和相位的误差值。仿真证明了该方法的有效性。     

存在阵列导引向量误差时的自适应波束形成算法

提出了一种存在阵列导引向量误差时的自适应波束形成算法。首先,文章提出了一个由接收信号协方差矩阵的噪声子空间和带有随机误差的期望信号导引向量构成的代价函数。然后基于非线性约束条件对此代价函数进行优化。新算法在期望信号导引向量存在误差的情况下仍能提供较好的输出SINR。仿真证明了新算法的有效性。     

基于波束空间的自适应波束形成算法

提出了一种稳健的波束形成算法。该算法利用干扰信号的导引向量和噪声向量对接收信号的协方差矩阵进行重构,经此处理后的协方差矩阵的信号子空间中不再包含期望信号成分,使得当期望信号功率较强时应用LCMV算法也不会对期望信号进行抑制。此外,算法还引入了锥形方差矩阵技术增强算法抑制干扰的能力。最后仿真证明了该算法的有效性。     

Compact multilayer dual-band bandpass filter design using stepped impedance resonators

Compact dual-band bandpass filter (BPF) for the 5th generation mobile communication technology (5G) radio frequency (RF) front-end applications was presented based on multilayer stepped impedance resonators (SIRs). The multilayer dual-band SIR BPF can achieve high selectivity and four transmission zeros (TZs) near the passband edges by the quarter-wavelength tri-section SIRs. The multilayer dual-band SIR BPF is fabricated on a 3-layer FR-4 substrate with a compact dimension of 5.5 mm ×5.0 mm ×1.2 mm. The measured two passbands of themultilayer dual-band SIR BPF are 3.3 GHz -3.5 GHz and 4.8 GHz -5.0 GHz with insertion loss (IL) less than 2 dB respectively. Both measured and simulated results suggest that it is a possible candidate for the application of 5G RF front-end at sub-6 GHz frequency band.