【百家大講堂】第177期🪄：為什麽密集天線陣的限製對稀疏天線陣有利

 

　　講座題目：為什麽密集天線陣的限製對稀疏天線陣有利

　　報 告 人：Prof. Dr. Leo P. Ligthart

　　時　 間：2019年3月28日下午14:00-16:30

　　地　 點：10號教學樓501

　　主辦單位：意昂平台、信息與電子學院

　　報名方式👩🏼‍⚖️🕵🏼‍♀️：登錄意昂官网微信企業號---第二課堂---課程報名中選擇“【百家大講堂】第177期：為什麽密集天線陣的限製對稀疏天線陣有利”

【主講人簡介】

  

    自1994年起，L.P. lithart是代爾夫特理工大學電氣工程數學和計算機科學學院(EEMCS)電信任務和雷達國際研究中心(IRCTR)的主任。在他的領導下，IRCTR的研究活動集中在以下具體領域:天線和傳播、雷達技術🐲、電信傳輸和微波遙感。

    在荷蘭技術基金會(STW)和國家和國際研究所的支持下，各組織和工業IRCTR開始與前蘇聯的研究小組合作開展項目🏊🏼，將這些研究小組的知識納入IRCTR的偏振雷達遙感和探地雷達方面。L.P. lithart獲得莫斯科國立民航技術大學榮譽博士學位，以表彰他對FSU國家雷達技術知識融合的貢獻🚶🏻‍♂️‍➡️。他獲得了托木斯克國立控製系統和放射電子學大學的榮譽博士學位，以表彰他為使該大學的研究達到國際水平所作的貢獻。

    Lithart教授負責這座近100米高的教學大樓樓頂上出色的雷達設備。根據Lithart教授的要求，在一間有條件的房間內安裝了一套新型的高科技毫米波設備🏌🏼‍♀️。高達110 GHz的AB-mm系統和HP系統的測試表明，IRCTR已經準備好進入mm-wave領域。

 

   Since 1994 Prof. dr. ir. L.P. Ligthart was director of the International Research Centre for TelecommunicationsTransmission and Radar (IRCTR) as part of the Faculty of Electrical Engineering Mathematics and Computer Science (EEMCS) of the Technical University of Delft. Under his directorship, IRCTR focused its research activities into the specific areas of: antennas and propagation, radar technology, telecommunications transmission and microwave remote sensing.

With support from the Netherlands Technology Foundation (STW) and national and international institutes, organisations and industries IRCTR started projects with research groups in the Former Soviet Union (FSU) to incorporate knowledge of those research groups into IRCTR on Polarimetric Radar Remote Sensing and on Ground Penetrating Radar. Prof. dr. ir. L.P. Ligthart received an Honorary Doctorate from the Moscow State Technical University of Civil Aviation for his contribution to knowledge fusion on radar technology from the FSU countries with existing knowledge in Western countries. He received an Honorary Doctorate from the Tomsk State University of Control Systems and Radioelectronics for his contribution to bring the research at that university at an international level.

Prof. Ligthart has been responsible for the outstanding radar facilities on the roof of the almost 100 m tall Faculty building. Based on the request of Prof. Ligthart a new high-tech mm-wave facility was granted and installed inside a conditioned room. Tests up to 110 GHz of the AB-mm system and the HP system have shown that IRCTR is well prepared to step into the mm-wave arena.

 

 

 

【講座信息】

    在現代無線電和雷達中，天線陣在滿足空間和頻域要求方面發揮著重要的多功能作用🧶。大多數文獻中存在所謂的“密集”陣列💓✳️，其天線單元之間的間距相等，波長為一半🦀。在為廣角掃描和高角分辨率而設計的密集陣中🕡，需要大量具有獨立收發模塊的單元👨🏻‍🔧，這意味著高增益密集陣天線的成本較高。元素間的相互耦合和廣角掃描要求降低了寬帶密集陣列的性能，給一代又一代的天線工程師帶來了許多頭痛的問題。

   在講座中📕，密集陣列的局限性引起了人們的註意。

   在所謂的“稀疏”數組中，元素之間的間距更大。稀疏數組很有趣🧎‍♂️‍➡️🪱，因為它們使用“數組細化”，因此潛在的成本更低。在講座中🦼👱‍♂️，一些稀疏陣列的設計展示了什麽是稀疏陣列的預期性能🫅🏻。在此基礎上，討論了稀疏陣的一系列應用(自主飛行器、機載幹涉傳感、近程高分辨率成像、多波束衛星天線)，並給出了具體的稀疏陣特性。

 

In modern radio and radar antenna arrays play an important multi-function role fulfilling demanding requirements in spatial and frequency domain. Most literature exists on so called ‘dense’ arrays with equidistant spacing between the antenna elements in the order of half the wavelength. In dense arrays designed for wide-angular scanning and high angular resolution, a large number of elements with individual transmit-receive modules is needed meaning that high gain dense antenna arrays are costly. Mutual coupling between the elements and wide-angular scanning requirements give degradation in wide band dense array performance and cause many headache problems for generations of antenna engineers. 

In the lecture the limitations in dense arrays get attention. 

In so called ‘sparse’ arrays the spacing between elements is larger. Sparse arrays are interesting because they use ‘array thinning’ and have therefore a potential lower cost. In the lecture some sparse array designs are presented showing what can be the expected performance of sparse arrays. After this a series of sparse array applications (Autonomous Vehicle, Airborne Interferometric Sensing, Near Range High resolution imaging, multi beam satellite antenna) are discussed, demonstrating specific sparse array characteristics