Research
In-band Full Duplex Cancellation Circuits
Summary:
RF systems not only suffer from externally-generated interference but also from self-generated interfering signals from transmitters on a common platform, while operating within the same band, especially with RADARs. As a result, the receivers performance is severely degraded. To acehive reliable reception major part of self-interference due to the Tx at the Rx should be cancelled out. Towards this, I developed a one of its kind wideband RF self interference cancellers that can provide at least 25 dB cancellation. Further, we also developed different approaches at the propagation domain (antenna) to increase the isolation between the Tx and Rx antennas.
Effort/Role:
(2015 – present) 100% involvement with RF canceller design & high isolation feed design.
(2018 – 2020) Mentored 1 graduate student on designing high isolation balun and antenna.
Achievements:
Based on this work, I was adjudged as the ‘Young Scientist’ in EMTS 2019 conference.
Received honorable mention in IEEE APS in 2018 (by mentored student).
2 patents on ‘Feed network design for improved isoaltion’ and ‘balun for cancellation’ resulted from this work.
Publications:
4 – journal publications, 8 – conference presentations
Novel SWAP-C Reduced Receiver For Dgital Beamformers
Summary:
Digital beamforming systems, or smart antennas, are widely used in wireless communication networks to enhance data rates, increase coverage, and mitigate interference. However, current digital beamformers employ an analog-to-digital (ADC) converter for each antenna element, implying high cost, area, and power requirements. As a part of my Ph.D research work, we have developed and validated a novel digital beamforming architecture using on-site code division multiplexing (OS-CDM). The latter allows for antenna outputs to be multiplexed in the analog domain and digitized using a single ADC. This approach significantly reduces analog and digital hardware and power and cost requirements by > 85%. OS-CDM can be used as the basis for future small factor UWB transceiver architectures.
Effort/Role:
(2013 – 2017) 100% involvement with RF canceller design & high isolation feed design.
(2018 – present) Mentored 1 graduate student on designing OSCR for mmWave systems.
Achievements:
Won the best paper award in 2017 URSI-GASS.
Received honorable mention in IEEE APS in 2015 & 2016.
Received honorable mention in IEEE APS in 2021 (by mentored student).
Formed the basis for the recently issues patent on ‘Frequency Independent receivers’.
Publications:
6 – journal publications, 6 – conference presentations
Wireless Implants for Neural Recording
Summary:
This unobtrusive and fully passive neurosensing is designed to revolutionize the field of remote medical monitoring. Being the first of its kind, it was necessary to design probes to closely match the low input impedance of the neurosensing implant. Several design parameters had to be considered to address both the physical and clinical relevance of the probes. The working principle of the neurosensing system involves harmonic mixing of the neural signal with a supplied carrier signal and demodulation of the backscattered signal to obtain an indication of neural activation. The neural implant is completely passive in nature realized using microwave components and circuits.
Effort/Role:
(2018 – present) Mentored 2 graduate student and 1 under graduate on design and realization of WiNS system.
Achievements:
Received honorable mentionin IEEE APS in 2019 (by mentored student).
Publications:
1 – journal publications, 5 – conference presentations
Stray Energy Transfer During Electrosurgery
Summary:
We are exploring the underlying mechanism of injuries associated with electrosurgery. Our endoscopy studies demonstrate that unintended RF coupling occurs, increasing tissue temperature alongside the breathing tube, and potentially causing unintentional burns. Our tonsillectomy studies demonstrate that unwanted RF energy gets coupled into adjacent metal-based objects (e.g., mouth retractor), potentially causing adverse effects, such as dysgeusia.
Effort/Role:
(2016 – 2017) 100% involvement with RF canceller design & high isolation feed design.
Achievements:
Top ten posters
Publications:
3 – journal publications, 3 – conference presentations
Waveform Generation using RFSoC
Under Development
Ion Spectroscopy
Under Development