科研学术

　　为搭建我校博士后之间的学术交流平台，促进学术水平提升，学校博士后管理办公室组织开展博士后学术沙龙活动。本次沙龙由我校博士后吴亚飞、刘思豪、杨锋、李玖娟和苏一洪分享其研究成果，诚挚邀请感兴趣的师生参加。

　　一、时　间：2021年12月7日（周二）14：30

　　二、地 　点：清水河校区经管楼宾诺咖啡

　　三、主办单位：电子科技大学博士后管理办公室

　　四、承办单位：电子科学与工程学院      电子科技大学博士后联谊会

　　五、活动安排：

　　报告一：

　　（1）主　题：超宽带低剖面共形相控阵天线技术

　　（2）主讲人：吴亚飞  电子科学与工程学院博士后

　　（3）交流内容：

　　在现代电磁频谱战中，电磁频谱存在泛在感知与精准控制的强烈需求，对频谱提出了超宽带精准感知的需求，因而相对应的电磁收发天线部件将面临着同时实现超宽带工作、大角度波束覆盖、高极化纯度的技术挑战，同时平台的适装性又对低剖面曲面外形以及低电磁散射等性能需求提出了额外的技术挑战。相控阵天线需要同时实现超宽带、超低剖面曲面共形、广域波束覆盖、高极化纯度与低散射等性能指标，这对超宽带天线的科学理论探索与工程实现提出了巨大挑战。

　　在本次报告中，将首先介绍超宽带天线的发展现状，在此基础上介绍本课题组在超宽带天线上关于频域超宽带、低剖面、辐射与散射特性、极化调控、共形设计上的最新进展。

　　（4）主讲人简介：

　　吴亚飞，2020年毕业于电子科技大学电磁场与微波技术专业，获工学博士学位。现为电子科技大学电子科学与工程学院博士后，目前主要研究方向为共形天线、相控阵天线等。以第一作者在本领域Top期刊Trans. on AP 上发表文章7篇，其中一篇Trans. on AP文章提名IEEE天线与电波传播协会R. W. King论文奖。在国内外学术会议获论文奖励3次：第48届欧洲微波会议“青年工程师奖”、中国首届微波周“林为干教育基金优秀论文奖”、国际电磁研讨会（iWEM2016）优秀论文奖。主持国家自然科学基金青年项目、中国博士后科学基金特别资助项目，中国博士后科学基金面上项目（一等），已公开10项发明专利申请，获得授权中国专利4项，美国专利1项。

　　报告二：

　　（1）主　题：基于特征模分析的超表面天线设计

　　（2）主讲人：刘思豪  电子科学与工程学院博士后

　　（3）交流内容：

　　在过去的数十年，微带天线由于其制造成本低、剖面低、重量轻等优点，被广泛的应用于各类无线系统中。随着无线技术的发展，各类无线系统对于天线提出了更多的要求，如多极化、多频段、宽带等。传统的微带天线无法满足快速发展的无线系统的需求。随着超表面天线的提出，为提升传统微带体现性能打开了一扇新的大门。传统的等效媒质、等效电路、散射系数等方法都无法有效地分析由少量的亚波长单元构成超表面天线的工作机理。为此，特征模理论被用于研究这类超表面天线的物理特性。

　　本次报告中，将简单介绍特征模理论基本概念和使用特征模分析设计天线的基本原则。在此基础上将通过具体设计案例对基于特征模分析的超表面天线设计方法进行讲解。

　　（4）主讲人简介：

　　刘思豪，2020年毕业于电子科技大学微电子学与固体电子学，获工学博士学位。现为电子科技大学电子科学与工程学院博士后。目前主要研究方向为基于特征模分析的天线设计方法、超表面天线、滤波天线以及电磁场与能源科学的交叉融合。发表相关学术论文20余篇，以一作/通信作者身份发表中科院二区论文10篇。申请发明专利24项，获得授权8项。

　　报告三：

　　（1）主　题：DOA Estimation via Sparse Signal Recovery in 4-D Linear Antenna Arrays

　　（2）主讲人：杨锋  电子科学与工程学院博士后

　　（3）交流内容：

　　A novel direction of arrival (DOA) estimation method for four-dimensional (4-D) linear arrays with optimized time sequences using the sparse signal recovery is briefly introduced and discussed in this talk. By establishing the sparse signal recovery model applied to DOA estimation of 4-D linear arrays, it is found that the time sequences have great influence on sparse signal recovery. Thus mutual coherence and covariance matrix of noise are introduced to evaluate its influence quantificationally. The differential evolutionary (DE) algorithm is then used for the optimization of time sequences such that the capability of sparse signal recovery is improved and the noise after time modulation is close to Gaussian white noise as much as possible. It can be found that the unidirectional phase center motion (UPCM) scheme is an excellent candidate by the optimization of an 8-element 4-D linear array. By comparison with the previous methods, simulated results demonstrate that the proposed method has distinct advantages over other methods in probability of resolution and estimation accuracy, especially for the cases where the number of snapshots is small and the SNR is low. Furthermore, an S band 4-D linear array with eight elements is designed and measured to demonstrate the performance of DOA estimation by the proposed method.

　　（4）主讲人简介：

　　Feng Yang received the Bachelor degree in electronic science and technology from Chongqing University of post and telecommunications and Ph.D. degree in electromagnetic field and microwave technology from University of Electronic Science and Technology of China, in 2014 and 2020, respectively. He currently works as a Postdoctoral Fellow in School of Electronic Science and Engineering of UESTC. Professor Shiwen Yang is his co-adviser. His main research interests include 4-D antenna arrays, unconventional antenna arrays, tightly coupled antenna arrays, optimization algorithms and array signal processing.

　　报告四：

　　（1）主　题：Research on Manufacturing Technology of IC Package Carrier Board Based on Conductive Polymer Constructing Copper Interconnect

　　（2）主讲人： 李玖娟  电子科学与工程学院博士后 

　　（3）交流内容：

　　This research revolves around conductive polymer as the seed layer to form electronic copper circuits or copper pillars to realize the interconnection of different types of IC package carrier boards by direct electroplating technology. High-density interconnection (HDI) technology is the first type of IC packaging carrier board manufacturing technology, with a minimum line width/line spacing of 50μm/50μm and a minimum aperture of 100μm. The conductive polymer replaces the electroless plating layer, to accomplishing the manufacture of the first type IC package carrier board. Modified Semi-Additive Process (mSAP) technology is the second type of IC packaging carrier board manufacturing technology, with a minimum line width/line spacing of 35μm/35μm and a minimum aperture of 75μm. Conductive polymer replaces thin copper foil of 3 micron, realizing the second type of IC package carrier board manufacturing. The fully additive coreless technology is the third type of IC packaging carrier board manufacturing technology, with a minimum line width/line spacing of 10μm/10μm and a minimum copper pillar diameter of 45μm. We plan to utilize conductive polymers instead of specific seed layers to achieve the third type of IC package carrier board manufacturing.

　　（4）主讲人简介：

　　Jiujuan Li received the Bachelor degree and Ph.D. degree from the University of Electronic Science and Technology of China in 2014 and 2020, respectively. Her research interests include nano-material synthesis, manufacturing of multi-functional packaging substrates, direct electroplating of conductive polymers, etc.

　　报告五：

　　（1）主　题：Mode/Structural composite transmission line and its application throughout microwave to THz

　　（2）主讲人：苏一洪  电子工程学院博士后

　　（3）交流内容：

　　微波传输线是微波电路以及天线的基础，也是无线系统构架中的至关重要的一环。随着电子技术的发展，一方面要求不断拓宽频谱范围，对宽带、多频化有着越来越多的需求；另一方面对微波设备和系统的小型化、集成化提出了新的要求。这推动了各种新型多功能、多频电路和天线的研究，也促使人们进行各种新型传输线的研究。结构复合传输线是由不同的传输线通过结构上的有机融合而成，具有结构复用，多模高隔离度同时传输特点的新型传输线。十分适合于多频电路，天线的小型化，实现大频率比的带宽覆盖，适用于微波-毫米波-太赫兹的全频谱系统需求。本次报告将简要介绍结构/模式复合传输线理论，重点针对提出的结构复合共面波导进行相关应用阐述。

　　Microwave transmission line is the basis of microwave circuit and antenna, and it is also an important part of wireless system architecture. With the development of electronic technology, on the one hand, it is required to continuously broaden the spectrum range, and there is more and more demand for broadband and multifrequency; On the other hand, it puts forward new requirements for the miniaturization and integration of microwave equipment and systems. This has not only promoted the research of various new multifunctional and multi frequency circuits and antennas, but also prompted people to study various new transmission lines. Structural composite transmission line is a new type of transmission line which is composed of different transmission lines through structural organic integration. It has the characteristics of structural sharing, supporting multi-mode with high isolation which is very suitable for multi frequency circuits, miniaturization of antennas covering the bandwidth throughout microwave to terahertz. This report will briefly introduce the theory of structural composite transmission line, focusing on the related applications of the proposed structural composite coplanar waveguide.

　　（4）主讲人简介：

　　Yihong Su is a post-doc majored in electromagnetic field and microwave technology. He obtained bachelor’s degree and PhD degree in UESTC. His research interests include Mode/Structural composite transmission line, multi-band circuit/antenna, aperture shared antenna array, THz technology and so on.

　　　　　　　　　　　　　　　　　　　　　　　　　电子科技大学博士后管理办公室

　　　　　　　　　　　　　　　　　　　　　　　　　　　　2021年12月2日