Rajavardhan Talashila (RT)

*LinkedIn *Youtube : trvabc *Spherical Harmonics : An introduction

Electromagnetics illustrations using Ansys HFSS

• Reciprocity
• Duality
• Enhanced Bounce Diagram
• Clarinet as a Horn Antenna
• Slide Screw Tuner working principle
• Resonance Isolator
• Dual Junction Circulator
• Microwave Testbench
• Direct Reading Frequency Meter
• Edge Guided Mode Isolator
• Faraday Rotation Isolator

Digital Beamforming System Simulation (Work at Ansys)

• Full system Simulation (Bits to Bits)
• Used SystemVue + Ansys HFSS + AGI-STK
• Real RF component characteristics included
• The flight dynamics are implemented in STK and linked to SystemVue
• Installed array patterns from HFSS are included in SystemVue
• Time wise tracking of the Tx / Rx are done with bidirectional link between SystemVue and STK

Writeups relevant to Signal Integrity

• Djorjovic-Sarkar Model as in HFSS
• Debye Model as in HFSS
• A primer on Generalized, Normalized, Power and Active S-Parameters

Bandpass Filter for 5G

• Designed, Fabricated and tested a bandpass filter with center frequency 3.5 GHz when working with the 5G Testbed at IIT Madras.

Masters Project : IITMSAT

• Effect of Satellite Attitude on the communication aspects
• The open access journal publication is Engineering Reports
• The antenna radiation patterns for the Tx and Rx on the IITMSAT are analyzed along with the attitude dynamics.

• The effect LHCP / RHCP on the overall link dynamics for a LEO satellite moving through the field of view of a ground station at Chennai are analyzed.

• The geomagnetic field directions in the relevant LEO orbit

• The LEO satellite availability towards the ground station : Simulation in STK

• Link Budget analysis for uplink and downlink

PhD work

• Related to Multipole Expansion of EM fields

• Pyramidal Horn Antenna : Multipole Analysis

• Understanding the bandstructure of GaAs

• Dynamics of Charge Carriers : Montecarlo simulation of charge carriers in optically excited direct band-gap semiconductors

Publications

Journal Articles

1. Talashila, R., & Ramachandran, H. (2021). Effect of polarization on the link dynamics of a spinning low-earth orbits satellite aligned with geomagnetic field. Engineering Reports Journal 1

2. Talashila, R., & Ramachandran, H. (2020). Multipole Expansion of Radiation From Patch Antenna Using Quasi-Static Surface Currents. IEEE Antennas and Wireless Propagation Letters, 19(12), 2136-2140. Journal 2

3. Talashila, R., & Ramachandran, H. (2019). Determination of Far Fields of Wire Antennas on a PEC Sphere Using Spherical Harmonic Expansion. IEEE Antennas and Wireless Propagation Letters, 18(4),646-650. Journal 3

NPTEL

Books Read

• THE DAY WE FOUND THE UNIVERSE by Marcia Bartusiak

It shows the evolution of human's understanding of the universe by studying the stars. This book is nothing less than a thriller. It takes you through the twists and turns of the conclusions made at crucial steps and their over turns. The complex human interactions are  protrayed to a good detail. You will know why the "Hubble Telescope" is named after him.

• BLACK HOLE by Marcia Bartusiak

It starts from the Newton's times and then takes you to the brink of the evidence leading to the possibility of the "holy grail" of physics at the event horizon of a black hole. It is intersting to note the image on the cover corresponds to the validation of the Einstein's General Theory of Relativity. 

• Einstein : A LIFE IN SCIENCE by Michael White and John Gribbin

This shows why Einstein's name props in every discussion related to phyiscs. It takes you through a good journey of his life. Along the way, the scientific details are satifying and instills a sense of appreciation towards intellectual achievements themselves.

• Michael Faraday and The Royal Institution: The Genius of Man and Place by John M. Thomas

I read this book on Prof [Andrew Zangwill's recommendation](https://shepherd.com/best-books/biographies-of-physicists).

Its a gem.

• Longitude by Dava Sobel

One will understand how many obstacles one should overcome to achieve something in the scientific world. This problem was know to Newton too. But he didn't propose a solution in his lifetime.

• The Monk who sold his Ferrari

I read this book multiple times. Though I am unable to put into practice all of its contents, this book changed my life to some extent.

• THE STREET LAWYER by John Grisham

Depending on your personality, you will have a clear conclusion on what is important to you : Money or Social Service. This book in layers depicts the life of home less people and a lawyer who fights for them in a particular situation. By the end, you should be amazed by the balance John Grisham strikes.

• THE TESTAMENT by John Grisham

Money, Money, Money.  You just read it until the end for an unforgettable, sweet and  memorable experience in your life.