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Bao, X. L. and Ammann, M. J., Design of Compact Annular-Ring Patch Antennas for Circular Polarization, in China Ireland International Conference on Information & Communication Technologies, Maynooth, Ireland, 2009, pp. 11-15.
Bao, X. L. and Ammann, M. J., A Cavity-Backed Spiral Slot Antenna with Wide Axial Ratio Beamwidth for GPS System, Microwave and Optical Technology Letters, vol. 56, no. 5, pp. 1050-1054, 2014.
Bao, X. L., Li, Z. F., and Sun, X. W., The Simple Derivation For the Effective Permittivities Formulae In the Finite Difference Grids, in IEEE AP-S International Symposium on Antennas and Propagation, Monterey, CA, USA, 2004, vol. 1, pp. 89- 92.
Bao, X. L. and Ammann, M. J., (Invited) Compact Spiral Loaded Printed Monopole Antenna, in European Conference on Antennas and Propagation - EuCAP, Barcelona, Spain, 2010, pp. C12P2-4.
Bao, X. L. and Ammann, M. J., Wideband Unidirectional Circularly Polarized Antenna for GPS/Galileo/GLONASS, in IEEE International Symposium on Antennas and Propagation, Chicago, IL, USA, 2012, p. 460.4.
Bao, X. L., Zhang, W. X., and Li, L. W., Study on the Dispersion Characteristics of PBG Structure Consisting of Anisotropic Medium By Using PSTD Method, Acta Electronica Sinica, vol. 65, no. 12, pp. 345-349, 2003.
Bao, X. L., Ruvio, G., and Ammann, M. J., The use of Electromagnetic Bandgap Structures to Enhance Circularly Polarized Annular-Ring Patch Antenna Performance, in Royal Irish Academy Colloquium on Physical Layer Wireless Communications, Dublin, Ireland, 2006.
Bao, X. L. and Zhang, W. X., Analysis on the Characteristics of Electromagnetic Wave Propagation of PBG Structure By Using FDTD Method, Chinese Journal of Radio Science, vol. 16, pp. 120-122, 2001.
Bao, X. L. and Ammann, M. J., Compact Concentric Annular-Ring Patch Antenna for Triple-Frequency Operation, Electronics Letters, vol. 42, no. 20, pp. 1129-1130, 2006.
Bao, X. L. and Ammann, M. J., Printed Circularly-Polarized Antenna with Ultra-Wide Axial-Ratio Bandwidth, IET Microwaves, Antennas & Propagation, vol. 5, no. 9, pp. 1089-1096, 2011.
Bao, X. L., Zhang, W. X., and Bo, Y. M., Numerical Diffraction Coefficients of the Irregular Top on a Conductive Cone a GMT/PO Approach, in International Symposium on Antennas, Propagation and EM Theory, Beijing, China, 2000, pp. 496 - 499.
Bao, X. L., Li, Z. F., and Sun, X. W., FDTD Analysis of Dispersion Characteristics of 2-D Dielectric Photonic Crystal Described By Effective Permittivity in Grid, Journal of Shanghai Jiaotong University, 2004.
Bao, X. L. and Ammann, M. J., Printed Triple-band Circularly Polarized Antenna for the Wireless Systems, Electronics Letters, vol. 50, no. 23, pp. 1664-1665, 2014.
Bao, X. L., Sun, X. W., Li, Z. F., Bao, W. Y., and Qian, R., 35 GHz Patch Antenna Array Based on the Electromagnetic Band‐Gap Structure, International Journal of Infrared and Millimeter Waves, vol. 24, no. 12, pp. 1799-1804, 2004.
Bao, X. L., Ruvio, G., Ammann, M. J., and John, M., A Novel GPS Patch Antenna on a Fractal Hi-Impedance Surface Substrate, IEEE Antennas and Wireless Propagation Letters, vol. 5, no. 1, pp. 323-326, 2006.
Bao, X. L. and Ammann, M. J., Dual-Frequency Dual-Circularly-Polarized Printed Slot Antenna, in LAPC - Loughborough Antennas & Propagation Conference, Loughborough, UK, 2011.
Bao, X. L. and Ammann, M. J., Microstrip-Fed Dual-Frequency Annular-Slot Antenna Loaded by Split-Ring Slot, IET Microwaves, Antennas & Propagation, vol. 3, no. 5, pp. 757-764, 2009.
Bao, X. L., Sun, X. W., Li, Z. F., Bao, W. Y., and Qian, R., 4-Unit Patch Antenna Array Based on the Electromagnetic Bandgap Structure, in IEEE Asia Pacific Microwave conference, New Delhi, India, 2004.
Bao, X. L. and Ammann, M. J., Dual-Frequency Circularly-Polarized Patch Antenna with Compact Size and Small Frequency Ratio, IEEE Transactions on Antennas & Propagation, vol. 55, no. 7, pp. 2104-2107, 2007.
Bao, X. L., Zhang, W. X., and Li, L. W., Study on the Bandgap Characteristics of Complex Material PBG Structure By Using Non-Yee Grid Higher Order FDTD Method, Chinese Journal of Radio Science, vol. 18, no. 4, pp. 353-358, 2003.
Bao, X. L. and Ammann, M. J., Compact Annular-Ring Embedded Circular Patch Antenna with a Cross-Slot Ground Plane for Circular Polarization, Electronics Letters, vol. 42, no. 4, pp. 192-193, 2006.
Bao, X. L., Shynu, S. V., and Ammann, M. J., Design of a Tunable Compact Antenna for Digital Video Broadcasting Handheld Terminals, in LAPC - Loughborough Antennas & Propagation Conference, Loughborough, UK, 2009, pp. 461-464.
Bao, X. L. and Ammann, M. J., Compact Microstrip-Fed Annular-Slot Antenna Combined with C-shaped Slot for Broad Dualband Operation, in Progress In Electromagnetics Research Symposium, Hangzhou, China, 2008, p. 84.
Bao, X. L., Zhang, W. X., and Bo, Y. M., Numerical Diffraction Coefficients of the Irregular Top on a Semi-Infinite Conductive Circular-Cylinder a GMT/PO Approach, in International Symposium on Antennas, Propagation and EM Theory, Beijing, China, 2000, pp. 500-503.
Bao, X. L. and Ammann, M. J., Investigation on UWB Printed Monopole Antenna with Rectangular Slitted Groundplane, Microwave and Optical Technology Letters, vol. 49, no. 7, pp. 1585-1587, 2007.

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