Dr. Chinmoy Saha’s research contribution encompasses key areas of applied Electromagnetics in general and state of the art techniques and methodologies in the area of i) microwave and mm wave circuits and antennas, ii) multi-functional antennas for modern wireless applications, iii) metamaterial inspired circuit and antennas, iv) wireless power transfer and energy harvesting and v) optical fiber based sensors, in particular.

The introduction of new wireless services and the quest for high-speed communication with enhanced data rate and channel capacity have led to unprecedented congestion in the RF spectrum. A cognitive radio (CR) system provides a sustainable solution due to its opportunistic and intelligent usage of the spectrum using ‘dynamic’ spectrum policy. In a CR system, the spectrum is shared using the sub-bands in an ultrawideband (UWB) frequency range.

In the tracking-by-detection approach of online multiple object tracking (MOT), a major challenge is how to associate object detections on the new video frame with previously tracked objects. Two important aspects that directly influence the performance of MOT are quality of detection and accuracy in data association. The authors propose an efficient and unified MOT framework for improved object detection, followed by enhanced object tracking. The object detection and tracking are considered as two independent functions in the tracking-by-detection paradigm.

Generally, controllers are tuned to meet the desired time and frequency domain specifications for integer/fractional order real coefficient systems whose frequency response is symmetric about the origin of the complex frequency plane. These controllers are tuned through analytical/numerical approaches. On the contrary, the frequency responses of the complex coefficient systems are unsymmetrical, and hence tuning of controllers should consider both positive and negative frequencies.

The development of processing maps using the dynamic materials modelling (DMM) approach is a widely used method for choosing the appropriate process parameters for the thermomechanical processing of any material. A processing map depicts the variation of metallurgical power dissipation efficiency (η) and the material stability with changes in temperature and strain rate for a constant strain.

Biogas issuing is a renewable and biodegradable clean energy source, that can be used to generate power and heat. The main component of both biogas and natural gas (NG) is methane diluted with inert gases like carbon dioxide (CO2). However, despite their advantages, it is not widely used because the composition can vary with the feedstock and therefore lead to uncertain combustion/engine performance and damage the hardware.

Fluid flow and heat transfer in regenerative cooling channels of rocket nozzles is a challenging research problem owing to its physical and geometrical complexities. Convergent–divergent rocket nozzles realize a varying wall heat transfer profile with a peak at its throat region. This creates an inherent difficulty in designing a proper single counter-current regenerative coolant path to maintain the nozzle wall within safe temperature limits during operation.

The single-stage-to-orbit (SSTO) reusable launch vehicle is an emerging cost-effective, reliable, and environmentally friendly space transportation concept. The dual throat nozzle (DTN) is a typical altitude compensating nozzle that ensure adapted nozzle flow throughout the flight. The DTN has an inner primary nozzle and an outer secondary nozzle. Hence, it is capable of expanding different propellant/oxidizer combinations. The parallel burn operations in which the expansion of combustion products from both thrust chambers exhibits an interesting flow phenomenon in the DTN.

Biological composites such as bone, nacre, spider silk, and bamboo are known for their magnificent mechanical properties compared to their constituents at the basic level. Their fine mechanical properties such as high strength and toughness are attributed to various geometric and material properties. Of these, the staggering type and hierarchical structure are two essential geometrical properties responsible for the superior mechanical properties. Bio-inspired composites are artificial composites inspired from the design of biological composites.

Hypersonic air-breathing engines are constrained to do supersonic combustion because of the effects such as vibrational excitation, dissociation, and high total pressure loss when performing subsonic combustion. Supersonic combustion has its challenges due to the very low residence time and limited combustor length. The use of liquid fuel is an attractive option for supersonic combustion due to its high energy density. Liquid fuel can also be used as a coolant since hypersonic air-breathing vehicles produce high thermal loads.