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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 Zhang, W. X., Study of the EM Wave Propagation Characteristics In 2-D Crystal PBG Structure By Using FDTD Method, in URSI XXVIIth General Assembly, Maastricht, The Netherlands, 2002, vol. BP, pp. 112-115.
Bao, X. L. and Ammann, M. J., Printed Band-Reject UWB Antenna with H-Shaped Slot, in IEEE International Workshop on Antenna Technology: Small and Smart Antennas, Metamaterials and Applications, Cambridge, UK, 2007, pp. 319-322.
Bao, X. L. and Zhang, W. X., Analysis of Dispersion Characteristics of 2-D Dielectric PBG Structure By Using Multi-Resolution Time-Domain Method, Journal of Southeast University, vol. 33, pp. 243-247, 2003.
Bao, X. L. and Ammann, M. J., Monofilar Spiral Slot Antenna for Dual-Frequency Dual-Sense Circular Polarization, IEEE Transactions on Antennas & Propagation, vol. 59, no. 8, pp. 3061-3065, 2011.
Bao, X. L. and Ammann, M. J., Design of Compact Multi-Band EBG Structures, in European Conference on Antennas and Propagation - EuCAP, Edinburgh, United Kingdom, 2007, p. TuPA.042.
Bao, X. L., Ruvio, G., and Ammann, M. J., Directional Dual-Band Slot Antenna with Dual-Bandgap High-Impedance-Surface Reflector, Progress In Electromagnetics Research, vol. C, no. 9, pp. 1-11, 2009.
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. and Zhang, W. X., A Hybrid GMT-PO Method for Calculating the NDC of the Irregular Edge of a Semi-Infinite Cone, International Journal of Infrared and Millimeter Waves, vol. 22, no. 8, pp. 1259-1265, 2001.
Bao, X. L. and Ammann, M. J., Wideband Dual-Frequency Dual-Polarized Dipole-Like Antenna, IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 831-834, 2011.
Bao, X. L., Li, Z. F., and Sun, X. W., An Approximate Expression of the Effective Permittivity In the Inhomogeneous Difference Unit Grid, Journal of Applied Sciences, 2004.
Bao, X. L. and Ammann, M. J., Dual-Frequency Dual-Sense Circularly-Polarized Slot Antenna Fed by Microstrip Line, IEEE Transactions on Antennas & Propagation, vol. 56, no. 3, pp. 645-649, 2008.
Bao, X. L. and Ammann, M. J., Comparison of Several Novel Annular-Ring Microstrip Patch Antennas for Circular Polarization, Journal of Electromagnetic Waves & Applications, vol. 20, no. 11, pp. 1427-1438, 2006.
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., 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., Ammann, M. J., and McEvoy, P., Microstrip-fed Wideband Circularly Polarized Printed Antenna, IEEE Transactions on Antennas & Propagation, vol. 58, no. 10, pp. 3150-3156, 2010.
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. 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., (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., Printed UWB Antenna with Coupled Slotted Element for Notch-frequency Function, International Journal of Antennas & Propagation, vol. 2008, p. Article ID 713921, 8 pages, 2008.
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. and Ammann, M. J., Dual-band GPS Patch Antenna based on Dual-band Fractal EBG Technique, in LAPC - Loughborough Antennas & Propagation Conference, Loughborough, UK, 2006, pp. 53-56.
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., 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. 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.

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