B5G Research Group | Prof. Rakhesh Singh Kshetrimayum

Rakhesh S. Kshetrimayum

FIET (UK), FIETE, SMIEEE

Dept. of EEE, IIT Guwahati, Assam 781039

rakhesh@ieee.org | rakhesh@comsoc.org

+91-361-2582514

🎉 IEEE RFM 2025 Best Student Paper Award & Student Travel Grant for B. B. Pathak @ Penang, Malaysia | Young Scientist Award by URSI AP-RASC for S. K. Sahu @ Sydney, Australia

📡 Beyond 5G Group

Research Gallery

1. Flexible Uniplanar Spoof Surface Plasmon Polariton Filters for Radio Stripes

Flexible uniplanar SSPP filter hardware testing assembly

This work presents a highly compact, flexible uniplanar SSPP filter designed specifically to integrate seamlessly into radio stripe architectures for next-generation 6G networks. By utilizing a single-conductor uniplanar design, the proposed filters ensure excellent mechanical flexibility and conformability while maintaining low insertion loss and sharp frequency selectivity. The structural innovation effectively suppresses unwanted electromagnetic interference (EMI) within distributed antenna systems, making it ideal for space-constrained communication nodes.

2. Radio Stripe Networks and Flexible MIMO Antennas for RSN applications

Cell-free massive MIMO radio stripe placement diagram inside infrastructure

Radio stripe networks provide a highly scalable, low-cost architectural framework for implementing cell-free massive MIMO systems by distributing serial access points (APs) into a single, easily deployable cable infrastructure. By integrating flexible MIMO antennas directly onto these ultra-thin, low-volume stripe profiles, the system eliminates the traditional bulky coaxial cabling while conforming effortlessly to existing room surfaces or building structures. This paradigm shift delivers high spatial diversity, superior spectral efficiency, and excellent coverage uniformity, serving as a critical hardware enabler for next-generation B5G and 6G indoor/outdoor communication ecosystems.

3. High Gain 3D Printed Antennas for CF-mMIMO Application

Fabricated 3D printed antenna array unit configuration

This work introduces high-gain, 3D-printed antennas engineered specifically to overcome path loss constraints in cell-free massive MIMO (CF-mMIMO) architectures. By leveraging additive manufacturing, the design achieves complex geometric optimization for maximum directive gain while significantly reducing production costs, weight, and deployment complexity. These custom-fabricated antennas optimize spatial multiplexing across distributed access points, presenting a highly scalable hardware solution for robust next-generation 6G coverage.

Our group currently focusses on solving technological challenges facing beyond 5G. We are a part of both Microelectronics, Photonics and RF Engineering and Communication Engineering clusters at IIT Guwahati. In B5G research group, presently, 4 PhD students, 2 MTech students and 1 IPDF are working under supervision of Prof. Rakhesh Singh Kshetrimayum.

👥 Current Members

Dr. Amit Baran Dey
IPDF
PhD, NIT Silchar
Utpal Kumar Sarma
PhD Research Scholar (Part-time)
MTech, Tezpur University
Abhishek Maganbhai Sonagara
PhD Research Scholar
MTech (RF & Microwave), IIT Kharagpur
Bhushan Ballav Pathak
MS+PhD Research Scholar
BTech, IIIT Guwahati
Sidhartha Kumar Sahu
PhD Research Scholar
MTech, NIT Rourkela, Co-supervised by Dr. R. K. Sonkar
Sanjay S K
MTech Scholar
BTech, Vidyavardhaka College of Engineering
Surendra Babu Gedela
MTech Scholar
BTech, Sir CR Reddy College of Engineering

Our group has strong alumni presence in India and abroad both in academia and industries.

🎓 B5G Group Alumni

2

IPDF

10

PhD

49

MTP

55

BTP

2

JRF

Dr. S. Mondal — Postdoctoral fellow @National Sun Yat Sen University, Taiwan (Hybrid RF/FSO communication, 2021-23), Co-mentored by Dr. S. Kashyap and Dr. M. Patra
Dr. S. Borah — FDTD analysis of Printed Monopole Antennas (2014-15)

Dr. M. Mishra — NPDF @IITK, Research Scientist @NUS, now Asst. Prof. @IIT Mandi (COMSNETS Fellow, 2023)
Dr. S. Chaudhuri — Asst. Prof. @GSV Vadodara (Dual Circularly Polarized Antennas, 2020), Co-supervised by Dr. R. K. Sonkar
Dr. R. S. Sangam — Asst. Prof. @IIEST Shibpur (Microwave Passive Devices, 2020)
Dr. A. Bhowal — Postdoc @INRS Canada, Asst. Prof. @NIT Rourkela (Best Thesis Award, 2020)
Dr. A. Agrawal — Asst. Prof. @IIIT Kota (UWB/mm-Wave, Best Poster Award, 2018), Co-supervised by Dr. A. Rajesh
Dr. S. Bhattacharjee — Asst. Prof. @IIIT Dharwad (Printed Monopole Antennas, 2016), Co-supervised by Prof. R. Bhattacharjee
Dr. B. Kumbhani — Asst. Prof. @IIT Ropar (MIMO Systems, 2015)
Dr. M. Manohar — Assoc. Prof. @MITS (Super Wideband Antennas, 2015)
Dr. J. R. Panda — Assoc. Prof. @KIIT (RFID/WLAN Antennas, 2012)
Dr. S. S. Karthikeyan — Assoc. Prof. @NIT Trichy (Metamaterial Resonators, 2011)

Tero Keyang (2026) - Model-Driven Deep Unfolding for RIS-Assisted Cell-Free Massive MIMO Under Finite-Blocklength URLLC, Co-supervised by Dr. B. R. Manoj
Pranav Agarwal (2026) - Machine Learning-Driven Predictive Modeling and Designing of Spoof Surface Plasmon Polariton (SSPP) Filter for 6G Applications
Jonnalagadda Tharun Kumar (2025) — Sum-Rate Improvement in IRS-aided Cell-Free Network
Sourav Sarkar (2025) — Liquid/Solid DRA for Beyond 5G
Varsha Raghav (2024) — Active IRS-aided Cell-Free Network, Co-supervised by Dr. S. Mukherjee
Korada Maneesh Kumar (2024) — Power Divider for B5G Radio Stripe
Swrjima Rani Boro (2024) — Active RIS Based Wireless Energy Transfer, Co-supervised by Dr. S. Kashyap
Pooja Rawan Dhangar (2023) — Novel Metasurface Design
Kongari Saikiran (2022) — Circularly Polarized MIMO DRA
K. S. V. N. Sai Kumar (2022) — IRS aided MIMO Spatial Modulation
L. Sunanda (2021) — Ultra-thin Printed Microwave Filters
S. Kumar (2021) — DRA with SSPP (now PhD @NTU Singapore)
S. Dash (2020) — Microstrip Filters (Best MTech Thesis, now PhD @University College Dublin)
A. Sundrani (2020) — Characteristic mode analysis for SSPP
A. S. Sapre (2019) — Enhanced Spatial Modulation
R. Lalani (2019) — SMBM for B2B Applications
S. Mog (2018) — Massive MIMO over Generalized Fading
P. Gorakhiya (2018) — Two-Way Relay with Spatial Modulation
P. Ramkumar (2017) — Dual-polarized printed antennas, Co-supervised by Dr. N. Nallam
B. N. V. S. Sai Kalyan (2017) — SIW Antennas
A. Polkam (2016) — Distributed Space-time Codes (now MS @SUNY Buffalo)
G. Singh (2016) — FDTD methods
V. P. Vani (2015) — BeamSpace MIMO
G. Joseph (2015) — Large MIMO Systems
R. Uikey (2015) — UWB Microstrip Filters
V. K. Mohandas (2014) — STBC Spatial Modulation
N. Kumar (2014) — Cooperative MIMO over κ-μ fading (PhD @IITG)
P. Bharadwaj (2014) — MoM for printed antennas
A. Kumar (2014) — Spectral domain MoM
S. Sunani (2014) — MIMO with Antenna Selection
L. N. B. Reddy (2014) — Cooperative Communication over κ-μ/η-μ fading
A. Singh Chauhan (2013) — QAM under fading
S. Anil Kumbhar (2013) — MIMO Detection
R. Pravin Kumar (2013) — LDPC concatenation
Rajkumar Jogi (2012) — Space Time Codes
Srinivas Ramavath (2012) — PAPR reduction for OFDM
V. Kumar Veludandi (2012) — UWB interference mitigation (PhD @IITK)
Prasadu Kakumanu (2011) — UWB filter design
U. Kiran Nemani (2011) — UWB antenna characteristics
A. Sriram Saladi (2010) — RFID tag antennas
S. Reddy Mallipeddy (2010) — UWB coexistence
Sunil Bojanapally (2010) — UWB beamforming
M. Babu Manapati (2009) — SAR reduction using metamaterials
A. Rao Putla (2008) — Sub-wavelength resonators
Ramu Pillalamarri (2008) — Broadband/UWB patch antennas
V. Krishna Meduru (2008) — Neural Networks for RF design
Shivakumar Manusani (2007) — OFDM receiver for WLAN
Dipto Dey (2007) — EBG patch antenna (Motorola Award)
Sridhar Kallapudi (2007) — Size miniaturized filters

Junior Research Fellows:

Muhim Kuli (2024-25) — Liquid Antennas (now PhD @Gauhati University)
Prajwalita Borah (2024) — Filters (now PhD @IIT Delhi)

BTech Alumni (select list):

A. Singh & N. Rautela (2021) — Quantum Spatial Modulation
R. Nayan & P. Sharma (2020) — Spatial-Correlation Antenna Grouping
A. Choudhary & A. Mathur (2020) — MIMO for Indoor Visible Light Communications
U. Singh & A. Raj (2020) — MIMO in Free-space Optical Communications
S. Jhunjhunwala & R. Dash (2019) — Metamaterial MIMO antenna
S. Raushan & S. Parasar (2019) — Space-Time Channel Modulation
K. Ahirwar & L. K. Bansla (2019) — Media Based Modulation
P. S. Aditya & S. K. V. Kodavati (2018) — Free Space Optical Wireless Communication
M. Gupta & S. R. Mirzan (2017) — Low Complexity Large MIMO Detection (MS/PhD @UT Austin)
S. Burugupalli & P. Meena (2017) — Game Theory for Cognitive Radio
S. Alam & V. Viswanath (2016) — MIMO Cognitive Radio (Institute Silver Medal, MS @UCSD)
M. Chaudhury & N. K. Meena (2016) — Low complexity large MIMO
A. K. Saxena & S. Goyal (2015) — MIMO cooperative communication (MS @UC Irvine, PhD @UT Austin)
S. Gupta & J. Yadav (2015) — Large MIMO systems
M. Kulkarni & L. Choudhary (2013) — MIMO cognitive radio (President of India Gold Medal, MS/PhD @UT Austin)
R. P. Singh & S. Kabra (2013) — Spatial Modulation (First Prize, Challenge Yourself India; MS @UCSD/VT)
N. Abhilash & K. Keerthi Vishal (2013) — Unitary/Differential Space Time Codes
K. Pegu & M. Basumatary (2012) — Equalization for MIMO
E. Abhinav & M. Chaitanya (2012) — SAR Calculation using FDTD
M. S. Charan Reddy & C. Sri Santosh (2012) — Spectral domain analysis
P. Joshi & S. S. Naik (2012) — Coplanar waveguide structures
P. Jain & P. K. Mili (2011) — UWB multiple access
M. P. B. Rao & P. Anil (2011) — Simple space-time codes
K. S. Sastry & T. S. Reddy (2010) — Narrowband interference in UWB (MS @VT)
A. Kumar & H. Deepak (2009) — Interference issues with UWB
S. Sriom & M. Khurana (2009) — PAPR reduction in OFDM
M. Sandeep Reddy (2008) — RFID + capacitive pressure sensor (MS @CMU), Co-supervised by Prof. Roy P. Paily
A. Bunchal & C. V. K. Reddy (2007) — Microstrip bandpass filters (MS @TAMU)