1. Bernardi, P., D. Caratelli, R. Cicchetti, V. Schena, and O. Testa, "A numerical scheme for the solution of the vector parabolic equation governing the radio wave propagation in straight and curved rectangular tunnels," IEEE Trans. on Antennas Propag., Vol. 57, 3249-3257, 2009.
doi:10.1109/TAP.2009.2027142
2. Phaebua, K., C. Phongcharoenpanich, M. Krairiksh, and T. Lertwiriyaprapa, "Path-loss prediction of radio wave propagation in an orchard by using modified UTD method," Progress In Electromagnetics Research, Vol. 128, 347-363, 2012.
3. Liu, Z.-Y. and L.-X. Guo, "A quasi three-dimensional ray tracing method based on the virtual source tree in urban microcellular environments," Progress In Electromagnetics Research, Vol. 118, 397-414, 2011.
doi:10.2528/PIER11041602
4. Dudley, D. G., M. Lienar, S. F. Mahmud, and P. Degauque, "Wireless propagation in tunnels," IEEE Antennas Propag. Magazine, Vol. 49, 11-26, 2007.
doi:10.1109/MAP.2007.376637
5. Sanchez-Escuderos, D., M. Ferrando-Bataller, J. I. Herranz, and M. Baquero-Escudero, "Optimization of the E-plane loaded rectangular waveguide for low-loss propagation," Progress In Electromagnetics Research, Vol. 135, 411-433, 2013.
6. Dong, J.-F. and J. Li, "Characteristics of guided modes in uniaxial chiral circular waveguides," Progress In Electromagnetics Research, Vol. 124, 331-345, 2012.
doi:10.2528/PIER11112312
7. Vaccari, A., A. Cala' Lesina, L. Cristoforetti, and R. Pontalti, "Parallel implementation of a 3D subgridding FDTD algorithm for large simulations," Progress In Electromagnetics Research, Vol. 120, 263-292, 2011.
8. Lee, Y.-G., "Electric field discontinuity-considered effective-permittivities and integration-tensors for the three-dimensional finite-difference time-domain method," Progress In Electromagnetics Research, Vol. 118, 335-354, 2011.
doi:10.2528/PIER11060304
9. Izadi, M., M. Z. A. Ab Kadir, and C. Gomes, "Evaluation of electromagnetic fields associated with inclined lightning channel using second order FDTD-hybrid methods," Progress In Electromagnetics Research, Vol. 117, 209-236, 2011.
10. Briso-Rodriguez, C., J. M. Cruz, and J. I. Alonso, "Measurements and modeling of distributed antenna systems in railway tunnels," IEEE Trans. on Veh. Technol., Vol. 56, 2870-2879, 2007.
doi:10.1109/TVT.2007.900500
11. Zhang, Y. P., "Novel model for propagation loss prediction in tunnels," IEEE Trans. on Veh. Technol., Vol. 52, 1308-1314, 2003.
doi:10.1109/TVT.2003.816647
12. Hrovat, A., G. Kandus, and T. Javornik, "Four-slope channel model for path loss prediction in tunnels at 400 MHz," IET Microwaves, Antennas and Propagation, Vol. 4, 571-582, 2010.
doi:10.1049/iet-map.2009.0159
13. Guan, K., Z. D. Zhong, B. Ai, C. Briso, and J. I. Alonso, "Measurement of distributed antenna systems at 2.4 GHz in a realistic subway tunnel environment," IEEE Trans. on Veh. Technol., Vol. 61, 834-837, 2012.
doi:10.1109/TVT.2011.2178623
14. Song, X. and R. Leonhardt, "Ray-optics analysis of single mode condition for optical waveguides with rectangular cross-section," Progress In Electromagnetics Research, Vol. 135, 81-89, 2013.
15. Zhang, Y., W. Zhai, X. Zhang, X. Shi, X. Gu, and Y. Deng, "Ground moving train imaging by Ku-band radar with two receiving channels," Progress In Electromagnetics Research, Vol. 130, 493-512, 2012.
16. Guan, K., Z. Zhong, B. Ai, R. He, and C. Briso-Rodriguez, "Five-zone propagation model for large-size vehicles inside tunnels," Progress In Electromagnetics Research, Vol. 138, 389-405, 2013.
17. Sun, Z. and I. F. Akyildiz, "Channel Modeling and analysis for wireless networks in underground mines and road tunnels," IEEE Trans. on Communications, Vol. 58, No. 6, 1758-1768, 2010.
doi:10.1109/TCOMM.2010.06.080353
18. Emslie, A. G., R. L. Lagace, and P. F. Strong, "Theory of the propagation of uhf radio waves in coal mine tunnels," IEEE Trans. on Antennas Propag., Vol. 23, No. 2, 192-205, 1975.
doi:10.1109/TAP.1975.1141041
19. Guan, K., Z. Zhong, B. Ai, R. He, Y. Li, and C. Briso, "Propagation mechanism modeling in the near-region of arbitrary cross-sectional tunnels," International Journal of Antennas and Propagation, Vol. 2012, Article ID 183145, 11 Pages, 2012, doi:10.1155/2012/183145.