[1] A. Sawant, I. Lee, and E. M. Choi, “Investigation of the origin of amplitude non-uniformity in vortex beams transformed by a transmissive structure,” IEEE Transactions on Antennas and Propagation (Accepted) (2020). DOI: 10.1109/TAP.2022.3140520

[2] A. Sawant, I. Lee, B. C. Jung, and E. Choi, “Ultimate capacity analysis of orbital angular momentum channels,” IEEE Wireless Communications 28, 90–96 (2021). DOI: 10.1109/MWC.001.2000258

[3] A. Sawant , D. Kwak, I. Lee, M. Chung, and E. M. Choi, “Stand-off radiation detection techniques,” Review of Scientific Instruments 91, 071501 (2020). DOI: 10.1063/1.5134088

[4] A. Sawant and E. M. Choi, “Development of the full package of gyrotron simulation code,” Journal of the Korean Physical Society 73, 1750–1759 (2018). DOI: 10.3938/jkps.73.1750

[5] A. Sawant and E. M. Choi, “Competition-free second harmonic mode THz orbital angular momentum gyrotron with dual-mode operation by a perturbed cavity,” Physics of Plasmas 24, 113109 (2017).

[6] A. Sawant, M. S. Choe, M. Thumm, and E. M. Choi, “Orbital angular momentum (OAM) of rotating modes driven by electrons in electron cyclotron masers,” Scientific reports 7, 1–10 (2017).

[7] A. Sawant, D. Yu, D. Kim, M. S. Choe, and E. M. Choi, “Generation and validation of topological charges of high-power gyrotron orbital angular momentum beams from phase retrieval algorithm,” IEEE Transactions on Terahertz Science and Technology 7, 164–171, (2016).

[8] A. Sawant, S. G. Kim, M.-C. Lin, J. H. Kim, Y. Hong, J. So, and E. M. Choi, “Validation of 3-D time domain particle-in-cell simulations for cold testing a W-band gyrotron cavity,” IEEE Transactions on Plasma Science 42, 3989–3995 (2014).

[9] A. Sawant, P. Jain, S. Illy, and M. V. Kartikeyan, “A triode-type magnetron injection gun for a dual frequency regime gyrotron operating at 42/84 GHz,” IEEE Transactions on Plasma Science

41, 3115–3121 (2013).

[10] I. Lee, A. Sawant, J. Shin, and E. Choi, “Accurate gyrotron performance prediction based on full 3-d magnetic field and electron beam information altered by nonideal factors,” IEEE Transactions on Electron Devices 68, 1276–1283 (2021).

[11] I. Lee, A. Sawant, and E. M. Choi, “High-directivity orbital angular momentum antenna for millimeter-wave wireless communications,” IEEE Transactions on Antenna and Propagation Accepted (2020).

[12] M. S. Choe, A. Sawant , and E. Choi, “High-density plasma diagnosis using quasi-optical millimeter-wave systems,” IEEE Transactions on Plasma Science 48, 3935–3941 (2020).

[13] H. Chung, D. Kim, A. Sawant, I. Lee, E. M. Choi, and J. Lee, “Generation of E-band metasurface-based vortex beam with reduced divergence angle,” Scientific Reports 10, 1–8 (2020).

[14] I. Lee, A. Sawant, J. Shin, and E. M. Choi, “Self-driving energy-recirculating micromachined G-band folded-waveguide traveling-wave tube oscillator,” IEEE Transactions on Electron Devices 65, 3492–3499 (2018).

[15] I. Lee, A. Sawant, M. S. Choe, D.-J. Lee, and E. M. Choi, “Accurate identification of whispering gallery mode patterns of gyrotron with stabilized electro-optic imaging system,” Physics of Plasmas 25, 013116 (2018).

[16] D. Kim, D. Yu, A. Sawant, M. S. Choe, I. Lee, S. G. Kim, and E. M. Choi, “Remote detection of radioactive material using high-power pulsed electromagnetic radiation,” Nature communications 8, 1–9 (2017).

[17] M. S. Choe, A. Sawant, K.-S. Lee, N. E. Yu, and E. M. Choi, “Measuring the carrier lifetime by using a quasi-optical millimeter-and thz-wave system,” Applied Physics Letters 110, 074101 (2017).

[18] D. Kim, M. S. Choe, D. Yu, A. Sawant, and E. M. Choi, “A method for pulse shortening of high-power millimeter waves using plasma breakdown,” IEEE Transactions on Plasma Science

44, 1320–1323 (2016).

[19] D. Kim, S. G. Kim, A. Sawant, D. Yu, M. Choe, and E. M. Choi, “Study on statistical breakdown delay time in argon gas using a w-band millimeter-wave gyrotron,” Physics of Plasmas

23, 043505 (2016).

[20] S. G. Kim, A. Sawant, I. Lee, D. Kim, M. Choe, J.-H. Won, J. Kim, J. So, W. Jang, and E. M. Choi, “System development and performance testing of a W-band gyrotron,” Journal of Infrared, Millimeter, and Terahertz Waves 37, 209–229 (2016).