Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
56
Scopus Publications
625
Scholar Citations
14
Scholar h-index
17
Scholar i10-index
Scopus Publications
Ceramic Fiber Interconnects Beyond 1000°C Enabled by Automatic Gain Compensated Millimeter-Wave CMOS Transceivers Abhishek Sharma, Christopher Kniss, Ratanak Phon, Rod Kim Proceedings IEEE International Symposium on Circuits and Systems, 2025 This paper investigates the hollow-core ceramic (alumina) fiber for millimeter-wave communications at high temperatures, up to 1100°C. Such interconnects will benefit extreme environment electronics used across many industries, including aerospace, avionics, and geothermal. We first study EM wave propagation through alumina fiber across 50-75 GHz range at high temperatures. The results show that the transmission magnitude decreases non-linearly as temperature increases. Furthermore, it remains stable with a variation of < 0.5 dB during one hour of heat exposure at 1100°C. Next, the fiber is paired with a 57 GHz CMOS transceiver to demonstrate high speed communication link at high temperatures. To compensate for temperature-related transmission variations, an automatic gain control loop is implemented in the receiver chain. The proposed system attains a data rate of 5 Gb/s. Our findings indicate that ceramic fibers offer desirable features, such as high melting point, low thermal conductivity, and good EM wave propagation at elevated temperatures, making them suitable for communication and sensing in harsh environments encountered during hypersonic flight or planetary exploration.
Temperature-Compensated Multi-Level CMOS Modulators Operating From 10 K to 300 K for Cryogenic Interconnects Christopher Kniss, Abhishek Sharma, Ratanak Phon, Gregory Shimonov, Eran Socher, Pragya R. Shrestha, Karthick Ramu, Jason P. Campbell, Amin Pourvali Kakhki, Richard Al Hadi, Rod Kim IEEE Journal of Microwaves, 2025 This work presents temperature-compensated cryogenic complementary metal-oxide-semiconductor (CMOS) modulators operating over a 10 K to 300 K temperature range, suitable for intra- and inter-thermal cryogenic communications. Conventional metal-based coax cables suffer from a fundamental trade-off between thermal load and frequency-dependent attenuation, where lower thermal load results in higher electromagnetic attenuation. The recent surge in cryogenic high-performance computing and quantum computing has driven the demand for scalable cryogenic interconnect solutions. New techniques in optical fibers and millimeter-wave backscatter transceivers have demonstrated the ability to transport digital data between thermally isolated temperatures without the need for coaxial cables. Our new modulator can integrate (at the package or chip level) with millimeter-wave transmitters co-located on the same thermal condition while supporting bandwidth-efficient modulations such as multi-level pulse amplitude modulations. Based on this motivation, we implemented a current-steering 2-bit modulator in a 65-nanometer (nm) bulk CMOS process. The modulator achieves a data rate of 13 gigabits per second (Gb/s) while consuming 15.4 mW under a 1.2 V supply at 10 K, resulting in an energy efficiency of 1.18 picojoules per bit (pJ/b). In addition to previously demonstrated optical fibers and millimeter-wave backscatter, we implemented a 150 GHz (GHz) transmitter utilizing the same current-steering modulator scheme in a 28-nm CMOS process. We established contactless connections between thermally isolated systems operating at 10 K and 300 K, achieving a data rate of 8 Gb/s.
Electromagnetic Stability Characterization of Millimeter-Wave Dielectric Fibers at Extremely High-Temperatures: Enabling Harsh Environment Communication and Sensing Abhishek Sharma, Yanghyo Rod Kim IEEE MTT S International Microwave Symposium Digest, 2024 The emergence of space exploration and hypersonic platforms necessitates the development of sophisticated electronics, communication systems, and sensors that can endure prolonged periods of stable functioning in challenging conditions, including extreme temperatures surpassing 500°C. This paper investigates the characteristics of electromagnetic wave propagation in dielectric fibers within the frequency range of 50–60 GHz under extreme heat. Our preliminary findings show stable signal transmission under prolonged exposure to heat at a specific temperature. Additionally, temperature variation affects the transmission, resulting in a 2 dB deviation for Teflon and quartz fiber, whereas the deviation in alumina fiber is approximately 4 dB. This study presents a first look into the potential utilization of dielectric fibers for communication and sensing in harsh environmental conditions. Perspectives on future research in this challenging yet promising field are also discussed.
Energy-Efficient and Rotationally Adjustable Millimeter-Wave Wireless Interconnects Abhishek Sharma, Yanghyo Rod Kim IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2024 Conventional interconnects experience significant mechanical durability, mobility, and signal integrity challenges when dealing with moving parts or implementing extensive interconnect networks. As a result, they often hinder the performance of advanced autonomous and high-performance computing systems. This paper presents a fully rotatable and diagonally flexible ultra-short distance (≈ 1 mm) wireless interconnect. The proposed wireless interconnect comprises a 57-GHz transceiver integrated with a folded dipole antenna through wire bonding, enabling a flexible contactless connection. Here, two folded dipoles communicate in the Fresnel zone (radiative near-field), where we leverage the longitudinal electric fields to alleviate the polarization mismatch over the entire rotation angle. We have implemented a non-coherent on-off keying (OOK) modulation scheme and employed an automatic gain control (AGC) loop and offset canceling feedback loop to compensate for the transmission degradation and signal imbalance. The proposed system consumes 58.2 mW of power under a 1 V supply while transferring data at a rate of 10-Gb/s, achieving 5.82-pJ/bit energy efficiency.
Millimeter-Wave Ceramic Antennas and Fibers for Extremely High-Temperature Applications Abhishek Sharma, Caleb Romero, Yanghyo Rod Kim IEEE Microwave Magazine, 2024 Many industrial, aerospace, and defense applications require electronics operating in harsh conditions like extremely high temperatures <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref>, <xref ref-type="bibr" rid="ref2" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[2]</xref>, <xref ref-type="bibr" rid="ref3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[3]</xref>, <xref ref-type="bibr" rid="ref4" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[4]</xref>, <xref ref-type="bibr" rid="ref5" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[5]</xref>, <xref ref-type="bibr" rid="ref6" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[6]</xref>, <xref ref-type="bibr" rid="ref7" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[7]</xref>, <xref ref-type="bibr" rid="ref8" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[8]</xref>.
Bipartite dielectric Huygens’ metasurface for anomalous refraction Abhishek Sharma, Alex M H Wong Physica Scripta, 2023 Huygens’ metasurfaces—fundamentally based on Schelkunoff's equivalence principle, Huygens’ metasurfaces consist of a two-dimensional array of Huygens’ sources formed by co-located orthogonal electric and magnetic dipoles. Such metasurfaces provide electric and magnetic responses to an incoming electromagnetic (EM) wave, leading to unidirectional scattering and 2π phase coverage. We herein report a near-reflectionless coarsely discretized dielectric Huygens’ metasurface that performs anomalous refraction, offering a low-loss platform for wave manipulation at high frequencies as compared to their lossy metallic analogue. The coarse discretization dramatically simplifies the design, resulting in a metasurface that is highly efficient, cost-effective and robust. In this paper, the proposed metasurface comprises two meta-atoms per period, and is hence named the bipartite dielectric Huygens’ metasurface. Through full-wave simulations at 28 GHz, we show that the proposed metasurface can reroute an incident EM wave from θ i = 15° to θ t = − 44.5° with a very high efficiency: 87% of the scattered power is anomalously transmitted to θ t . Based on our observations, a coarsely discretized dielectric Huygens’ metasurface platform can be efficacious to design meta-devices with multifaceted functionalities in different frequency regimes.
Extremely High Temperature Millimeter-Wave Ceramic Fiber Communications Caleb Romero, Abhishek Sharma, Yanghyo Rod Kim Asia Pacific Microwave Conference Proceedings APMC, 2023 This work presents an extremely high-temperature ceramic fiber communication operating at 60 GHz. Ceramic materials exhibit a melting temperature above 2000°C, much higher than metals and polymer materials such as Teflon, polyethylene, and polystyrene. In addition, unlike metals, ceramics can act as an excellent thermal insulator and protect interconnected electronic systems from extreme heat. We implemented a 60-GHz CMOS transmitter (Tx) and receiver (Rx) and connected the Tx/Rx using Alumina fiber to demonstrate extreme temperature interconnect solutions. As a proof of concept, we placed the fiber within a propane-generated fire and achieved a 5-Gb/s data rate while consuming 56 mW of power under a 1-V supply.
Metasurface-Enabled Full 360° Azimuth Surface-Level Beam Scanning Antenna System Abhishek Sharma, Alex M. H. Wong 2022 IEEE International Symposium on Antennas and Propagation and Usnc Ursi Radio Science Meeting AP S Ursi 2022 Proceedings, 2022 This paper investigates the use of metasurface (MS) to enhance the scan range performance of the phased-array antenna for next-generation sub-6 GHz applications. The proposed system consists of a cylindrical Huygens' MS integrated with the source (phased array), and the MS steers the beam from the source towards the horizon. The metasurface's inherent symmetry also allows for full azimuth surface-level scanning. The proposed system achieves a gain of more than 15.5 dBi across the frequency range of 3.5-3.8 GHz.
Floquet Mode Circulation using a Coarsely Discretized Dielectric Huygens' Metasurface Abhishek Sharma, Alex M. H. Wong 2022 3rd Ursi Atlantic and Asia Pacific Radio Science Meeting at AP Rasc 2022, 2022 This paper reports a ternary dielectric Huygens’ metasurface – a metasurface comprising three elements per period, that performs Floquet mode circulation in k-space. We modeled the metasurface as a three-port network, and through full-wave simulation at 28 GHz, we show that the proposed metasurface performs circulation by transforming the FB modes from mode number (+1, 0, -1) to (0, -1, +1), respectively. The corresponding input and output angles are (+33.8 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">◦</sup> , 0 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">◦</sup> ,−33.8 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">◦</sup> ) and (0 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">◦</sup> , −33.8 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">◦</sup> ,+33.8 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">◦</sup> ), respectively.
EMSICC Based CRLH Compact Leaky-wave Antenna with Enhanced Broadside Efficiency Isap 2018 2018 International Symposium on Antennas and Propagation, 2018
Differentially-Driven Dielectric Resonator Antenna using TE20 Mode Substrate Integrated Waveguide Isap 2018 2018 International Symposium on Antennas and Propagation, 2018
TE20 Mode Air Filled SIW based Balun Bandpass Filter Isap 2018 2018 International Symposium on Antennas and Propagation, 2018
SIW fed MIMO DRA for future 5G applications Abhishek Sharma, Anirban Sarkar, Moitreya Adhikary, Animesh Biswas, M. J. Akhtar 2017 IEEE Antennas and Propagation Society International Symposium Proceedings, 2017
Millimeter-Wave Dielectric Huygens' Metasurface for Symmetric Beam Splitting A Sharma 2025 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 1-4 , 2025 2025
Temperature-compensated multi-level CMOS modulators operating from 10 K to 300 K for cryogenic interconnects C Kniss, A Sharma, R Phon, G Shimonov, E Socher, PR Shrestha, ... IEEE Journal of Microwaves , 2025 2025
Ceramic Fiber Interconnects Beyond 1000° C Enabled by Automatic Gain Compensated Millimeter-Wave CMOS Transceivers A Sharma, C Kniss, R Phon, R Kim 2025 IEEE International Symposium on Circuits and Systems (ISCAS), 1-5 , 2025 2025 Citations: 1
Millimeter-Wave Ceramic Antennas and Fibers for Extremely High-Temperature Applications [Application Notes] A Sharma, C Romero, YR Kim IEEE Microwave Magazine 25 (8), 77-87 , 2024 2024 Citations: 2
Energy-efficient and rotationally adjustable millimeter-wave wireless interconnects A Sharma, YR Kim IEEE Journal on Emerging and Selected Topics in Circuits and Systems 14 (3 … , 2024 2024 Citations: 5
Electromagnetic Stability Characterization of Millimeter-Wave Dielectric Fibers at Extremely High-Temperatures: Enabling Harsh Environment Communication and Sensing A Sharma, YR Kim 2024 IEEE/MTT-S International Microwave Symposium-IMS 2024, 571-574 , 2024 2024 Citations: 1
Extremely High Temperature Millimeter-Wave Ceramic Fiber Communications C Romero, A Sharma, YR Kim 2023 Asia-Pacific Microwave Conference (APMC), 459-461 , 2023 2023 Citations: 1
Bipartite Dielectric Huygens' Metasurface for Anomalous Refraction A Sharma, AMH Wong arXiv preprint arXiv:2302.06424 , 2023 2023 Citations: 3
Bipartite dielectric Huygens' metasurface for anomalous refraction A Sharma, WMH Alex Physica Scripta 98 (11), 115539 , 2023 2023 Citations: 3
Metasurface-Enabled Full 360° Azimuth Surface-Level Beam Scanning Antenna System A Sharma, AMH Wong 2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI … , 2022 2022 Citations: 1
Floquet Mode Circulation using a Coarsely Discretized Dielectric Huygens’ Metasurface A Sharma, AMH Wong 2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC), 1-4 , 2022 2022 Citations: 1
Dimer Dielectric Huygens' Metasurface: Realizing Perfect Anomalous Reflection at 60 GHz A Sharma, AMH Wong 2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI … , 2021 2021 Citations: 2
Coarsely Discretized Huygens' Metasurface: Manipulating EM Waves with Simplicity A Sharma, C Qi, KA Oyesina, AMH Wong 2021 IEEE International Conference on Electronics, Computing and … , 2021 2021 Citations: 3
Sparsely Discretized Refracting Dielectric Huygens’ Metasurface at 28 GHz A Sharma, AMH Wong 2020 IEEE Asia-Pacific Microwave Conference (APMC), 1027-1029 , 2020 2020 Citations: 3
Compact CRLH Leaky-Wave Antenna Using TE 20-Mode Substrate-Integrated Waveguide for Broad Space Radiation Coverage A Sarkar, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 68 (10), 7202-7207 , 2020 2020 Citations: 38
Controlling Wavefront using a Coarsely Discretized Dielectric Huygens' Metasurface A Sharma, AMH Wong 2020 IEEE International Symposium on Antennas and Propagation and North … , 2020 2020 Citations: 6
Towards Efficient EM Wave Manipulation Using a Discrete Dielectric Huygens’ Metasurface A Sharma, AMH Wong 2020 14th European Conference on Antennas and Propagation (EuCAP), 1-3 , 2020 2020 Citations: 6
Novel analysis of the size and orientation dependent resonance phenomenon of the microstrip line coupled complementary split‐ring resonator NK Tiwari, A Sharma, SP Singh, MJ Akhtar, A Biswas International Journal of RF and Microwave Computer‐Aided Engineering 30 (2 … , 2020 2020 Citations: 3
Anisotropic Metasurface-Based Beam-Scanning Dual-Polarized Fan-Beam Integrated Antenna System KK Katare, S Chandravanshi, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 67 (12), 7204-7215 , 2019 2019 Citations: 21
EMSIW-Based Compact High Gain Wide Full Space Scanning LWA With Improved Broadside Radiation Profile A Sarkar, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 67 (8), 5652-5657 , 2019 2019 Citations: 26
MOST CITED SCHOLAR PUBLICATIONS
Composite right/left-handed based compact and high gain leaky-wave antenna using complementary spiral resonator on HMSIW for Ku band applications A Sarkar, M Adhikary, A Sharma, A Biswas, MJ Akhtar, Z Hu IET Microwaves, Antennas & Propagation 12 (8), 1310-1315 , 2018 2018 Citations: 64
Wideband multiple‐input–multiple‐output dielectric resonator antenna A Sharma, A Biswas IET Microwaves, Antennas & Propagation 11 (4), 496-502 , 2017 2017 Citations: 62
A‐shaped wideband dielectric resonator antenna for wireless communication systems and its MIMO implementation A Sharma, A Sarkar, A Biswas, MJ Akhtar International Journal of RF and Microwave Computer‐Aided Engineering 28 (8 … , 2018 2018 Citations: 45
Compact CRLH Leaky-Wave Antenna Using TE 20-Mode Substrate-Integrated Waveguide for Broad Space Radiation Coverage A Sarkar, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 68 (10), 7202-7207 , 2020 2020 Citations: 38
SIW-Based Quad-Beam Leaky-Wave Antenna With Polarization Diversity for Four-Quadrant Scanning Applications A Sarkar, S Mukherjee, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 66 (8), 3918-3925 , 2018 2018 Citations: 37
Single‐feed cross‐slot loaded compact circularly polarized microstrip antenna for indoor WLAN applications S Kumar, BK Kanaujia, A Sharma, MK Khandelwal, AK Gautam Microwave and Optical Technology Letters 56 (6), 1313-1317 , 2014 2014 Citations: 35
EMSIW-Based Compact High Gain Wide Full Space Scanning LWA With Improved Broadside Radiation Profile A Sarkar, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 67 (8), 5652-5657 , 2019 2019 Citations: 26
SIW fed MIMO DRA for future 5G applications A Sharma, A Sarkar, M Adhikary, A Biswas, MJ Akhtar 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI … , 2017 2017 Citations: 24
Dual-band multiple-input multiple-output antenna based on half split cylindrical dielectric resonator A Sharma, A Sarkar, A Biswas, MJ Akhtar Journal of Electromagnetic Waves and Applications 32 (9), 1152-1163 , 2018 2018 Citations: 22
Bi-directional SIW leaky-wave antenna using TE20 mode for frequency beam scanning A Sarkar, A Sharma, M Adhikary, A Biswas, MJ Akhtar Electronics Letters 53 (15), 1017-1019 , 2017 2017 Citations: 22
Anisotropic Metasurface-Based Beam-Scanning Dual-Polarized Fan-Beam Integrated Antenna System KK Katare, S Chandravanshi, A Sharma, A Biswas, MJ Akhtar IEEE Transactions on Antennas and Propagation 67 (12), 7204-7215 , 2019 2019 Citations: 21
Equilateral triangular dielectric resonator based co‐radiator MIMO antennas with dual‐polarisation A Sharma, A Sarkar, A Biswas, M Jaleel Akhtar IET Microwaves, Antennas & Propagation 12 (14), 2161-2166 , 2018 2018 Citations: 20
Dual-band stacked circularly polarized microstrip antenna for S and C band applications S Kumar, A Sharma, BK Kanaujia, MK Khandelwal, AK Gautam International Journal of Microwave and Wireless Technologies 8 (8), 1215-1222 , 2016 2016 Citations: 18
Fingerprint image enhancement using Wavelet transform and Gabor filtering V Kakkar, A Sharma, TK Mangalam, P Kar Acta Technica Napocensis 52 (4), 17 , 2011 2011 Citations: 14
Millimeter-Wave Quad-Port Multiple-Input Multiple-Output Dielectric Resonator Antenna Excited Differentially by TE 20 Mode Substrate Integrated Waveguide A Sharma, A Sarkar, A Biswas, MJ Akhtar 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 1-4 , 2019 2019 Citations: 13
A polarization diversity substrate integrated waveguide fed rectangular dielectric resonator antenna A Sharma, A Sarkar, A Biswas, R Sloan, Z Hu 2016 Asia-Pacific Microwave Conference (APMC), 1-4 , 2016 2016 Citations: 12
Dielectric resonator loaded substrate integrated waveguide cavity backed slot antenna for bandwidth enhancement A Sharma, S Mukherjee, A Biswas 2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI … , 2015 2015 Citations: 12
Compact dual-band hybrid dielectric resonator antenna loaded with magnetic-LC resonator A Sharma, A Sarkar, A Biswas, M Jaleel Akhtar Journal of Electromagnetic Waves and Applications 32 (10), 1298-1305 , 2018 2018 Citations: 9
Wideband stacked maltese cross-shaped DR antenna for WiMAX and WLAN applications A Sharma, A Biswas IET Microwaves, Antennas & Propagation 11 (2), 247-252 , 2017 2017 Citations: 9