Design and analysis of a structure-based microstrip bandpass filter

A structure-based microstrip passband filter with the center frequency of 2.6 GHz was put forward by using double-mode resonator based on defected ground structure （DGS） technology. A double-mode coupling resonator combined with DGS structure was used to achieve the resonance frequency and the filter size. CST microwave studio was used to optimize the attenuation performance to get the filter parameters. A structure-based passband filter was fabricated. Simulation is consistent with the measurement. Performance shows that the proposed filter could be suitable for the time division-long term devolution （TD-LTE） microwave systems at 2.6 GHz.     

微带长度及阻抗比对SIR带通滤波器的谐波频率的影响

分析了微带长度及阻抗比对SIR带通滤波器的谐波参数的影响，并利用Angilent ADS仿真软件分别对不同长度及不同阻抗比的滤波器电路进行仿真分析，找出谐波频率随微带长度及阻抗比变化的规律。     

基于器件特性的改进高效率F类微带拓扑分析与实现

本文提出了一种新型的F类高效率功率放大器微带匹配拓扑。该拓扑简单紧凑且考虑了功率三极管输出端寄生效应,使得F类设计理论分析更贴合实际。基于提出的拓扑结构,采用商用10W GaN HEMT(Gallium-Nitrogen High Electron Mobility Transistor)进行了仿真与硬件实现。测试结果表明:当漏极偏置27V,工作频率2.995GHz时,实测输出功率为37.3dBm,功率附加效率为72.9%。在15~30V的偏置范围内,漏极调制效率达到68.9%以上。实测与仿真结果的吻合,很好的验证了拓扑的可行性。     

Design of MEMS C-Band Microstrip Antenna Array Based on High-Resistance Silicon for Intelligent Ammunition

In recent years, microstrip antennas have been more widely applied in satellite communications, mobile phones, unmanned aerial vehicle (UAV), and weapons. A micro-electro-mechanical systems-based (MEMSbased) high-resistance silicon C-band microstrip antenna array has been designed for the intelligent ammunition. The center frequency is 4.5 GHz. A cavity has been designed in substrate to reduce the dielectric constant of silicon and high-resistance silicon has been used as the material of substrate to improve the gain of antenna. It is very easy to be manufactured by using MEMS technology because of the improved structure of the antenna. The results show that the gain of the antenna is 8 dB and voltage standing wave ratio (VSWR) is less than 2 by the analysis and simulation in high frequency structure simulator (HFSS).     

新型阶梯阻抗谐振器滤波器的性能研究

对阶梯阻抗谐振器的谐振特性等进行了分析和计算。设计了一种新型缺陷地结构双T形微带带阻滤波器和一种新型缺陷地结构双H形微带带通滤波器,对其滤波性能进行了仿真计算。该文设计的滤波器具有宽带宽,高衰减,结构简单等优点,可供射频电路应用参考。     

6～18 GHz超宽带微带均衡器设计与实现

6～18GHz超宽带微波组件幅频特性起伏比较大,采用幅度均衡器可有效改善增益平坦度,使其满足指标要求。根据谐振理论和传输线理论进行了6～18GHz超宽带微带幅度均衡器设计。利用ADS和HFSS仿真,采用λ/4的开路微带线和薄膜电阻构成谐振频率可调、品质因数可调、带宽可调以及均衡量可调的谐振单元,同时增加适当的调节块对谐振频率进行微调,设计出满足指标要求的小尺寸样件,得到了所需的均衡曲线。实验表明,可以在这个频段上高效、准确、灵活地设计出所需均衡器。     

宽带小型化U型贴片天线的设计

设计了一副中心频率为2 GHz的四分之一波长U型贴片天线.采用U型槽加载减小了探针电感,使天线实现双谐振工作,通过将双频比调整到接近为1以展宽天线的工作频带,设计出的天线的带宽达49%(VSWR<2).利用短路墙加载技术,使天线的尺寸在四分之一波长左右,减小了天线尺寸,天线的尺寸仅为29.5 mm×40 mm×12 mm.实际制作了该天线,测试结果与理论分析基本吻合,验证了设计的正确性.该天线结构简单,便于设计以及加工制作,同时方便集成于移动通信设备中.     

一种RBF神经网络辅助设计的新型微带双模滤波器

通过引入弯折型马刺线,提出了一种新型微带双模滤波器。该结构降低了传统微带双模滤波器的耦合损耗,减小了滤波器尺寸,并具有良好的可调节带通特性。给出了该滤波器的模式激励与耦合工作机理的物理解释,并提出结合RBF神经网络方法,外推滤波器结构参数的设计方法。该滤波器实验结果与预测结果吻合良好。     

合成孔径雷达的双波段双极化共孔径天线阵技术

综述了合成孔径雷达(SAR)的双波段双极化共孔径天线阵技术近十年来的发展.介绍了数款双波段双极化SAR天线的设计与主要性能及其比较.此外还阐述了提高双波段双极化天线性能的某些新技术.