Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed. A more common definition in radio-frequency engineering is the range between 1 and 100 GHz, or between 1 and 3000 GHz . The prefix micro- in microwave is not meant to suggest a wavelength in the micrometer range; rather, it indicates that microwaves are small, compared to the radio waves used in prior radio technology.
Neuromorphic computing is an approach to computing that is inspired by the structure and function of the human brain. A neuromorphic computer/chip is any device that uses physical artificial neurons to do computations. In recent times, the term neuromorphic has been used to describe analog, digital, mixed-mode analog/digital VLSI, and software systems that implement models of neural systems. Recent advances have even discovered ways to mimic the human nervous system through liquid solutions of chemical systems.
A metamaterial is a type of material engineered to have a property, typically rarely observed in naturally occurring materials, that is derived not from the properties of the base materials but from their newly designed structures. Metamaterials are usually fashioned from multiple materials, such as metals and plastics, and are usually arranged in repeating patterns, at scales that are smaller than the wavelengths of the phenomena they influence. Their precise shape, geometry, size, orientation, and arrangement give them their "smart" properties of manipulating electromagnetic, acoustic, or even seismic waves: by blocking, absorbing, enhancing, or bending waves, to achieve benefits that go beyond what is possible with conventional materials.
Udupi Ramachandra Rao was an Indian space scientist and former chairman of the Indian Space Research Organisation. He was also the Chairman of the Governing Council of the Physical Research Laboratory at Ahmedabad and Nehru Planetarium at Bengaluru and chancellor of the Indian Institute for Space Science and Technology (IIST) at Thiruvananthapuram. He is known as "The Satellite Man of India". He pioneered India's first satellite launch Aryabhata in 1975.
G. Madhavan Nair is an Indian space scientist and a former chairman of the Indian Space Research Organisation, and Secretary to the Department of Space, Government of India. His tenure saw commencement of Indian Human Spaceflight Programme and launch of extraterrestrial exploration mission Chandrayaan-I.
A memristor is a non-linear two-terminal electrical component relating electric charge and magnetic flux linkage. It was described and named in 1971 by Leon Chua, completing a theoretical quartet of fundamental electrical components which also comprises the resistor, capacitor and inductor.
Dr. S. K. Shivakumar was an Indian Distinguished Scientist from Karnataka state who worked at the Indian Space Research Organisation (ISRO) centres. He was awarded the Padma Shri, the fourth highest civilian award of India, in 2015.
Koodli Nanjunda Ghanapathi Shankara was a space scientist from India. He was the Director of ISRO's Space Applications Centre (SAC), Ahmedabad and ISRO Satellite Centre (ISAC), Bangalore. He was the Director of Satellite Communications Program Office and Program Director, INSAT, and was looking after overall planning and direction of communication satellite program. His work in the field of transponder design and development led to a boost in India's communication satellite technology.
A terahertz metamaterial is a class of composite metamaterials designed to interact at terahertz (THz) frequencies. The terahertz frequency range used in materials research is usually defined as 0.1 to 10 THz.
Metamaterial antennas are a class of antennas which use metamaterials to increase performance of miniaturized antenna systems. Their purpose, as with any electromagnetic antenna, is to launch energy into free space. However, this class of antenna incorporates metamaterials, which are materials engineered with novel, often microscopic, structures to produce unusual physical properties. Antenna designs incorporating metamaterials can step-up the antenna's radiated power.
Thekkethil Kochandy Alex is an Indian space scientist. He was the director of the ISRO Satellite Centre (ISAC) of Indian Space Research Organisation (ISRO) (2008–2012) and Member, Space Commission. He specialized in electro-optic systems and satellite technology. Starting with the first Indian satellite Aryabhata, he has been responsible for the sensor systems in all the Indian satellites. Under his leadership the Laboratory for Electro Optics Systems (LEOS) was established in 1993 and from the inception he was its director till 2008. He was conferred "Dr. Vikram Sarabhai Distinguished Professorship" in 2011.
The history of metamaterials begins with artificial dielectrics in microwave engineering as it developed just after World War II. Yet, there are seminal explorations of artificial materials for manipulating electromagnetic waves at the end of the 19th century. Hence, the history of metamaterials is essentially a history of developing certain types of manufactured materials, which interact at radio frequency, microwave, and later optical frequencies.
Electronic engineering is a sub-discipline of electrical engineering that emerged in the early 20th century and is distinguished by the additional use of active components such as semiconductor devices to amplify and control electric current flow. Previously electrical engineering only used passive devices such as mechanical switches, resistors, inductors, and capacitors.
Microwave engineering pertains to the study and design of microwave circuits, components, and systems. Fundamental principles are applied to analysis, design and measurement techniques in this field. The short wavelengths involved distinguish this discipline from electronic engineering. This is because there are different interactions with circuits, transmissions and propagation characteristics at microwave frequencies.
M.Y.S. Prasad is an Indian scientist and the former director of the Satish Dhawan Space Centre Sriharikota Range (SDSC-SHAR). Govt. of India’s Civilian Award Padma Shri for the year 2014 for his distinguished service in Science and Technology.
Prem Shanker Goel is an Indian space scientist, former secretary at the Department of Ocean Development, Ministry of Earth Sciences, Government of India and a former director of Indian Space Research Organization. He was honored by the Government of India, in 2001, with the fourth highest Indian civilian award of Padma Shri.
Nilamber Pant is an Indian space scientist, a former member of the Space Commission of India and a pioneer of satellite based communication and broadcasting in India. He served at the Satish Dhawan Space Centre and the ISRO Satellite Centre before becoming the vice chairman of the Indian Space Research Organization (ISRO). The Government of India awarded him the fourth highest Indian civilian honour of Padma Shri in 1984.
Debatosh Guha is an Indian researcher and educator. He is a Professor at the Institute of Radio Physics and Electronics at the Rajabazar Science College, University of Calcutta. He is an Adjunct faculty at the National Institute of Technology Jaipur and had also served Indian Institute of Technology Kharagpur as HAL Chair Professor for a period during 2015-2016.
Distributed-element circuits are electrical circuits composed of lengths of transmission lines or other distributed components. These circuits perform the same functions as conventional circuits composed of passive components, such as capacitors, inductors, and transformers. They are used mostly at microwave frequencies, where conventional components are difficult to implement.
Prof. Siddheshwari Prasad Chakravarti was an Indian engineer, researcher, and educator. He was known as the father of electronics and telecommunications engineering in India.
