Recent Trends in Electromagnetics and Optics
Organized by the Electronics and Telecommunication Engineering Department | IIEST, Shibpur
DST-SERB sponsored Workshop
Dr. Saikat Chandra Bakshi
National University of Singapore
Topic of Lecture:
RECONFIGURABLE RASORBERS: THE NEW ERA OF STEALTH TECHNOLOGY
Abstract of Lecture:
The Advent of Electromagnetic Absorbers almost Half a Century ago, have enabled Several Applications, with the Main Goal to reduce Radar Cross Section (RCS) of Weapon / Antenna System. However, due to Placement of Lossy Absorber Structure close to the Radiating Element (Antennas), the Overall Radiation Performances degrade Rapidly. To overcome such Difficulties, the Structures called
Frequency Selective Absorbers (or Rasorbers) are proposed, offering In-band Signal Transmission Window along with out of Band RCS Reduction Capability. However, previously only Passive Rasorbers could be developed that are not enough for Fifth Generation of Stealthy Aircraft System. For present Demand of Stealthy Aircraft / Missile Systems, the Use of Reconfigurable Rasorbers is Inevitable.
The Talk will highlight a Series of Research Outcomes on the Design of Absorbers and mostly on Reconfigurable Rasorbers. The Main Aim is to provide the Audience a Perspective of Difficulties & Challenges that are present to Design the Latest (5G) Stealthy Aircraft / Missile System. To avoid Eavesdropping by Hostile Systems, the Communication Frequency needs to be varied Continuously. However, previously no Radome / Rasorber could be developed that can provide such Frequency tuning Characteristics. The Talk will consist of the Elaboration of Different Techniques that have been introduced to Design a Tunable Rasorbers.
Further, Research Outcomes to develop a Fully Reconfigurable Rasorber will also be highlighted. The Idea to accommodate all the Rasorber Modes in a Single Structure will also be discussed. The most Advanced Form of Reconfigurable Rasorber, i.e., Multifunctional Rasorbers will also be highlighted which is believed to be the most Suitable for Present Highly Demanding AESA (Active Electronically Scanned Array Radar) System.
A Bit About Dr. Bakshi
Dr. Saikat Chandra Bakshi is presently a Post-Doctoral Research Fellow in the Department of Electrical and Computer Engineering, National University of Singapore (NUS) where he is working with Defence Science Organisation-DSO (The National Defence Agency of Singapore) on the Development of Space Deployable Phased Array Systems. Prior joining NUS, he received his Doctoral Degree (Ph.D. in Engineering) from Indian Institute of Engineering Science and Technology, Shibpur, India in 2021. His Ph.D. works were mostly focused on the Development Modern Stealthy Antenna Systems and FSS based Radome Design. Dr. Bakshi was with the Indian Space Research Organisation (ISRO) for a Short Tenure, and he had worked Extensively on Phased Array & Reflectarray Antennas for Satellite Communication with the Antenna System Group (ASG). He had vastly contributed to develop Novel Analytical Tools to characterise Irregular Shaped Antenna Arrays. Dr. Bakshi had published many in many Reputed Journal Articles like IEEE Transactions on Antenna and Propagation, IEEE Transaction on Microwave Theory and Technique and Journal of Applied Physics etc. His Current Research Interests include Phased Array Antennas, Irregular Array Analysis & Synthesis, Metamaterials & Frequency Selective Surfaces