14. K. Ren, “2D direction finding of an amplitude modulated signal Using a uniform triangular array” IEEE Antennas Wireless Propag. Lett., submitted.
13. K. Ren, “Helicopter-mounted HF direction finding antenna with rotor-blade modulation using the Characteristic Mode Theory,” IEEE Antennas Wireless Propag. Lett., vol. 22, no. 7, pp. 1597-1601, July 2023.
12. K. Ren, “Direction finding using a single antenna with blade modulation,” IEEE Antennas Wireless Propag. Lett., vol. 21, no. 5, pp. 873-877, May 2022.
11. K. Ren and R. J. Burkholder, “Geometric parameter estimation of buried objects in near-field microwave images,” IEEE Geosci. Remote Sens. Lett., vol. 19, 4500205, 2022.
10. K. Ren, R. Ma, and N. Behdad, “Performance-enhancement of platform-based, HF direction finding systems using dynamic mode selection,” IEEE Open J. Antennas Propag., vol. 2, pp. 793-806, July 2021.
9. K. Ren*, R. Ma*, M. R. Nikkhah*, S. Eggleston, Y. J. Ren, and N. Behdad, “Contact ECG Recording Using Copper and E-Textile Based Flexible Dry Electrodes,” Progress in Electromagnetics Research M, vol. 101, pp. 47-58, 2021.
8. K. Ren and R. J. Burkholder, “A 3-D novel fast back projection imaging algorithm for stratified media based on near-field monostatic and bistatic SAR,” IEEE Trans. Antennas Propag., vol. 69, no. 4, pp. 2326-2335, April 2021.
7. K. Ren*, M. R. Nikkhah*, and N. Behdad, “Design of dual-polarized, platform-based HF antennas using the characteristic mode theory,” IEEE Trans. Antennas Propag., vol. 68, no. 7, pp. 5130-5141, Jul. 2020.
6. K. Ren, M. R. Nikkhah, and N. Behdad, “Earth effect emulation using periodic structures in scaled-model characterization of HF antennas,” IEEE Antennas Wireless Propag. Lett., vol. 18, no. 12, pp. 2731-2735, Dec. 2019.
5. K. Ren, Q. Wang, and R. J. Burkholder, “A fast back-projection approach to diffraction tomography for near-field microwave imaging,” IEEE Antennas Wireless Progag. Lett., vol. 18, no. 10, pp. 2170-2174, Oct. 2019.
4. S. Sadeghi, K. Mohammadpour-Aghdam, K. Ren, R. Faraji-Dana, and R. J. Burkholder, “A pole extraction algorithm for wall characterization in through-the-wall imaging systems”, IEEE Trans. Antennas Propag., vol. 67, no. 11, pp. 7106-7113, Nov. 2019.
3. K. Ren and R. J. Burkholder, “Identification of hidden objects in layered media with shadow projection near-field microwave imaging,” IEEE Geosci. Remote Sens. Lett., vol. 15, no. 10, pp. 1590-1594, Oct. 2018.
2. K. Ren, J. Chen, and R. J. Burkholder, “A 3-D uniform diffraction tomographic algorithm for near-field microwave imaging through stratified media,” IEEE Trans. Antennas Propag., vol. 66, no. 6, pp. 3034-3045, Jun. 2018.
1. K. Ren and R. J. Burkholder, “A uniform diffraction tomography imaging algorithm for near-field microwave scanning through stratified media,” IEEE Trans. Antennas Propag., vol. 64, no. 12, pp. 5198-5207, Dec. 2016.
13. K. Ren, "FDTD in Computational Electromagnetics and Quantum Transport ", The USNC-URSI National Radio Science Meeting, University of Colorado Boulder, Jan. 7-10, 2025.
12. K. Ren, "Direction-of-arrival estimation using a uniform linear array considering antenna radiation patterns", The USNC-URSI National Radio Science Meeting, University of Colorado Boulder, Jan. 9-12, 2024.
11. K. Ren, "HF Direction-of-Arrival Estimation Using Helicopter-Integrated Single-Antenna", IEEE Int. Symp. Antennas Propag., Portland, Jul. 23-28, 2023.
10. K. Ren, “Single-antenna blade modulation based 3D direction finding,” IEEE Int. Symp. Antennas Propag., Denver, Jul. 10-15, 2022.
9. K. Ren, “Lab-based antenna theory course using full-wave numerical simulation software FEKO”, 2022 Annual Conference of the American Society for Engineering Education - Northeast Section, Boston, April. 22-23, 2022.
8. A. Rodas, K. Ren, “A wideband Vivaldi antenna for drone-based microwave imaging system”, 2022 Annual Conference of the American Society for Engineering Education - Northeast Section, Boston, April. 22-23, 2022.
7. K. Ren, “Experimental demonstration of geometric parameter estimation of hidden objects in layered media,” The USNC-URSI National Radio Science Meeting, University of Colorado Boulder, Jan. 4-8, 2022.
6. K. Ren and R. J. Burkholder, “Experimental demonstration of the shadow projection algorithm for near-field microwave imaging of buried objects in layered media,” IEEE Int. Symp. Antennas Propag., Atlanta, Jul. 7-12, 2019.
5. K. Ren and R. J. Burkholder, “Near-field microwave imaging of embedded objects in a dense slab with normal dipole illumination,” IEEE Int. Symp. Antennas Propag., Boston, Jul. 8-13, 2018.
4. K. Ren and R. J. Burkholder, “A fast uniform 3D near-field microwave imaging method for layered media,” IEEE Int. Symp. Antennas Propag., San Diego, Jul. 9-14, 2017.
3. K. Ren and R. J. Burkholder, “A uniform diffraction tomographic algorithm for real-time portable microwave imaging,” IEEE Int. Symp. Antennas Propag., Fajardo, Puerto Rico, Jun. 26-Jul. 1, 2016.
2. J. Chen, K. Ren, and R. J. Burkholder, “Fast radar imaging algorithm for the detection of objects embedded in a stratified medium,” IEEE Int. Symp. Antennas Propag., Vancouver, Canada, Jul. 19-25, 2015.
1.K. Ren, J. Chen, and R. J. Burkholder, “Investigation of gaps between blocks in microwave images of multilayered walls,” IEEE Int. Symp. Antennas Propag., Vancouver, Canada, Jul. 19-25, 2015.
2. K. Ren, A. Fouda, and I. Capoglu, “Pipe thickness estimation with automatic channel quality assessment,” WO Patent 2019094225, May 16, 2019.
A. Fouda, K. Ren, and I. Capoglu, “Method for estimating the material properties and the individual thicknesses of nested pipes,” WO Patent 2019094209, May 16, 2019.