Optimization of sub-0.1-μm offset Γ-shaped gate MHEMTs for millimeter-wave applications

We examine the effects of device scaling in both vertical and lateral dimensions for the metamorphic high electron mobility transistors (MHEMTs) on the DC and millimeter-wave electrical performances by using a hydrodynamic transport model. The well-calibrated hydrodynamic simulation for the sub-0.1-μm offset Γ-gate In_0.53Ga_0.47As/In_0.52Al_0.48As MHEMTs shows a reasonable agreement with the electrical characteristics measured from the fabricated 0.1 μm devices. We have calibrated all the parameters using the measurement data with various physical considerations to take into account the sophisticated carrier transport physics in sub-0.1-μm devices. Being simulated with these calibrated parameters, the optimum device performance is obtained at a source-drain spacing of 2 μm, a gate length of 0.05 μm, a barrier thickness of 10 nm and a channel thickness of 12 nm.     

Design and Analysis of Millimeter-Wave Marchand Balun with Interconnected Transmission Line

This paper presents the design and analysis of general baluns of Marchand-type with a transmission line connected between two sections. A series of new expressions of S-parameters are derived for such type of Marchand balun. The relations between the length of interconnected transmission line and the imbalance of Marchand balun are discussed. By using analytical method, a millimeter-wave Marchand balun was designed and simulated by the full-wave electromagnetic software HFSS, and fabricated in 0.15 μm pHEMT GaAs process. The measurement results show that the balun achieves low insertion loss and good balance in the band of 24–40 GHz. The results are in good agreement with the simulated ones. The theoretical analysis is verified.     

基于DSP的汽车防撞雷达及其信号处理

介绍了一种基于TMS320VC5402 DSP芯片的汽车防撞雷达及其信号处理系统的软硬件设计方法。该系统对车载毫米波雷达接收信号利用变步长LMS自适应算法进行噪声消除,有效地克服了固定步长因子所导致的收敛速度与稳态误差之间的矛盾,提高了处理速度。计算机仿真证实,该算法具有可行性,易于实时实现噪声对消系统。     

毫米波频率综合器研究进展

频率综合器的性能对通信系统有极大的影响,本文简要介绍了频率综合器的基本原理,系统全面地综述了毫米波频率综合器的国内外研究进展,着重报道了单片微波集成电路(MMIC)工艺实现的60GHz锁相频率综合器理论和实验研究最新成果,分析了各种电路实现的优点和不足之处,预测了毫米波频综的发展趋势及相关技术要求,提出了一些有益建议。     

W波段数字变极化目标特性测量雷达

提出一种新型的W波段数字变极化目标特性测量雷达.该雷达由两子阵变极化天馈、两通道TR模块与数字处理单元构成, 采用空间波束合成任意极化发射、数字方式实现任意极化接收.通过目标实验结果表明, 该雷达能在多种极化体制下准确提取目标极化散射矩阵, 具备测量目标全极化RCS能力以及可用于目标极化特性分析与研究.     

一种改进的対拓Vivaldi天线设计

提出了一种新颖的対拓Vivaldi天线。该天线的辐射耀斑用新的复合指数曲线修正。为改善天线的辐射特性(增益,波束偏离和交叉极化),提出了一个新的引向器,该引向器由两个混合椭圆金属贴片构成。测试结果表明该天线在1到40GHz频率范围内增益>0dBi, 并且在15到40G频段内天线的增益>12dBi。在3到40GHz频率范围内,E面的波束偏离小于3°,并且在15到40GHz不超过2°。     

一种38.4~43.4 GHz CMOS压控振荡器

设计了一种基于65 nm CMOS工艺的交叉耦合全差分40 GHz压控振荡器(VCO)。为了减小仿真结果与测试结果的差距,对电感及其连接其他元件而延长的金属线在电磁场仿真软件里重新进行了仿真。设计中应用了厚栅容抗管来增大电压的调谐范围,从而实现更高的频率覆盖范围。流片后的测试结果表明,VCO的振荡频率覆盖38.4~43.4 GHz,调谐范围达到12.2%,符合基于无线局域网IEEE 802.11ad标准设计的两级下变频60 GHz无线收发机对本振频率的要求。当振荡频率为39 GHz时,应用该VCO的锁相环锁定在41.76 GHz时测得1 MHz偏移频率处的相位噪声为－90.9 dBc/Hz。芯片采用1 V电源电压供电,功耗为5.7~8.6 mW,核心芯片面积为(0.197×0.436) mm²。     

K波段线性功率合成放大器的设计与研究

毫米波放大器的设计已经越来越倾向于以具有体积小、重量轻、直流功耗低等优点的固态器件通过功率合成技术来实现。在成熟的波导T型合成结构基础上加以改进,实现了该放大器的合成效率高、尺寸小、易于散热、易于模块化等优点,再配合新研制出的一种具有幅度／相位特性补偿的预失真结构加以辅助,最终达到了在K波段高线性的功率输出。     

Design and Analysis of Novel Antenna for Millimeter-Wave Communication

At present, the microwave frequency band bandwidth used for mobile communication is only 600 MHz. In 2020, the 5G mobile Communication required about 1 GHz of bandwidth, so people need to tap new spectrum resources to meet the development needs of mobile Internet traffic that will increase by 1,000 times in the next 10 years. Utilize the potentially large bandwidth (30∼300 GHz) of the millimeter wave frequency band to provide higher data rates is regarded as the potential development trend of the future wireless communication technology. A microstrip patch implementation approach based on electromagnetic coupling feeding is presented to increase the bandwidth of a dual-polarized millimeter-wave antenna. To extend the antenna unit's impedance bandwidth, coplanar parasitic patches and spatial parallel parasitic patches are used, and a 22 sub-array antenna is developed using paired inverse feed technology. The standing wave at the centre frequency of 37.5 GHz is less than 2 GHz. The antenna array's relative bandwidth is 6.13 percent, the isolation is >30 dB, the cross-polarization is −23.6 dB, and the gain is 11.5 dBi, according to the norm. The proposed dual-polarized microstrip antenna has the characteristics of wide frequency bandwidth, large port isolation, low cross-polarization, and high gain. The antenna performance meets the general engineering requirements of millimeter-wave dual-polarized antennas.     

基于位置相关的高分辨雷达目标检测方法

本文研究了毫米波高分辨雷达杂波背景下目标信号的检测问题,提出了基于高分辨雷达目标一维距离象位置-径向距离相关信息的非参数检测方法。该方法不但计算复杂度低,而且还具有检测沿距离走廊上多个扩展目标的能力。通过毫米波高分辨步进频率雷达实测数据证实,这是一种非常有效的扩展目标信号检测方法。