真空微电子器件的进展与问题

本文简要地叙述了真空微电子学的主要进展,在介绍场发射阵列FEA、场发射显示器FED、真空微电子微波毫米波器件等的发展过程中,重点叙述了有关器件对FEA的特殊要求、可能的解决办法和存在的问题,并介绍了发展真空微电子微波管的主要内容和意义;最后提到了有效地发展我国真空微电子器件需重视的一个问题.     

毫米波空间行波管输能结构的设计

本文采用分段设计的方法,将一个完整的盒型窗输出耦合结构分解为三部分,然后对这三部分分别进行匹配设计,最后将设计好的各部分组合成整体。利用HFSS软件对各段结构以及整体结构进行了仿真,结果表明这样设计出的盒型窗输出耦合结构在工作频带内可以很好的满足设计要求。     

双栅极场发射阵列的特性模拟与设计

具有聚焦能力的双栅极场发射阵列(DGFEA)是两类最有发展前途的真空微电子器件(高分辨率场发射显示器和真空微电子微波、毫米波器件)的关键技术。本文简要比较了两种结构的DGFEA的主要性能和优缺点,叙述了双层栅极结构DGFEA的设计与模拟方法.从模拟计算获得的发射特性和聚焦性能可以看到:这种结构的DGFEA能获得几乎平行的场发射电子束,其最大发射电流密度可达到约500A/cm2以上,是发展真空微电子微波、毫米波器件和其它强流电子注器件等较理想的电子源。     

基波注入锁定谐波耿氏振荡器研究

本文基于同步振荡器的非线性模型，导出了基波注入锁定二次谐波耿氏振荡器的锁定带宽表达式，完成了三毫米波段第二次谐波振荡器的基波注入锁定实验，理论分析与实验结果吻合。     

基于压缩感知的三孔径毫米波合成孔径雷达侧视三维成像

 基于压缩感知,该文研究了交轨向三孔径毫米波合成孔径雷达侧视3维成像问题。利用交轨方向的三孔径天线形成的稀疏阵列结构,获取高程分辨率并实现3维成像。由于交轨方向的采样数较少及非均匀采样,高程分辨率低,传统的基于傅里叶变换的3维成像技术获得的图像质量较差。针对此不足,在交轨向稀疏采样的条件下,该文采用压缩感知方法来实现超分辨成像。利用仿真和实际数据比较了传统成像方法和基于压缩感知的成像方法的性能,并验证了该文方法的有效性。     

新型拓展带宽毫米波开槽波导功率合成器

针对毫米波开槽波导空间功率分配/合成器相对带宽较窄,合成路数增多时带宽锐减的缺点,提出了一种新型的拓展带宽的结构。该结构采用E面改进型T形结构成多分支网络,通过减少每个功率分配/合成器的合成路数,使其在输出更大功率的同时,带宽得到拓展。在Ka频段设计了此种结构的网络,并通过1×12阵列和2×6阵列的性能比较,发现2×6阵列的带宽几乎是1×12阵列的两倍,且具有尺寸小、合成效率高和容易散热等优点,从而验证了此种结构的可行性。     

A DETECTION METHOD OF HIGH RESOLUTION RADAR TARGETS BASED ON POSITION CORRELATION

This paper studies a detection method of targets of high resolution radar operating at the band of millimeter-wave(32-38GHz) under the background of the clutters, and proposes a new nonparametric detection method, which not only does less computation, but also is able to detect multiple extended targets radially distributed along distance "corridor", based on the position (range) correlation information of one-dimensional range images(or called range profiles) of high resolution radar targets. The experimental results, on the real echo data of tank illuminated by the millimeter-wave stepped frequency high resolution radar, have certified that such a method presented in this paper is a very effective detection method for multiple extended targets.     

毫米波波导环行器研究

本文提出了一种分析部分高度铁氧体柱毫米波Ｈ面波导环行器的新方法，基于导出的一系列公式，分析，设计，研制和测试了毫米波段的宽带环行顺，分析数值结果与实验测量结果吻合。     

Bussgang decomposition-based sparse channel estimation in wideband hybrid millimeter wave MIMO systems with finite-bit ADCs

Both the hybrid architecture and low precision analog-to-digital converters (ADCs) are considered to alleviate the burden of high power cost and hardware implementation of millimeter wave (mmWave) communication system. Accordingly, the channel estimation issue in wideband mmWave system with finite-bit ADCs becomes even challenging. To address this issue, the non-linear mmWave channel estimation problem is reformulated into a linear sparse signal recovery problem by utilizing the Bussgang decomposition. Then, based on the equivalent linear sparse model, a Bussgang decomposition-based OMP (BD-OMP) algorithm is proposed to both exploit the inherent sparsity of wideband mmWave channel and alleviate the quantization error. Furthermore, we analyze that the actual noise of linear sparse model consists of combined noise and distortion noise, which is related to the number of quantization bits, antennas, and received signal power in a large scale regime. In addition, the terminal condition of BD-OMP algorithm is derived based on the residual difference of two consecutive iterations, where the expectation of residual difference is the variance of the actual noise. Simulation results demonstrate that the proposed approach can significantly reduce the training overhead for estimating wideband mmWave channel with finite-bit ADCs at the receiver.     

3mm锁相源研究及系统应用

采用双环数字锁相方式完成3mm波锁相源研究,并成功应用于国内第一套“95GHz毫米波干涉仪”测速系统。提出了一种新的毫米波双环锁相源相位噪声估测方法。实验结果表明:该毫米波锁相源工作在95GHz时,输出功率大于10mW,相位噪声达到-59dBc/Hz@10kHz,在-10℃~ 45℃温度范围内的频率稳定度为1.2×10-6,完全满足测速系统对毫米波发射源的高稳定、高精确度技术要求。