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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. 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., (Invited) Compact Spiral Loaded Printed Monopole Antenna, in European Conference on Antennas and Propagation - EuCAP, Barcelona, Spain, 2010, pp. C12P2-4.
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., 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., 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. 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., 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., 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., 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. 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., 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.
Bao, X. L., Li, Z. F., and Sun, X. W., Application on the Microstrip Patch Array Antenna with the Electromagnetic Bandgap Structure, Journal of Microwave, 2005.
Bao, X. L. and Zhang, W. X., Comparison Study of FDTD And MRTD Methods For Analyzing the 2-D PBG Structure, in Cross Strait Tri-Regional Radio Science and Wireless Technology Conference, Shanghai, China, 2002, pp. 172-175.
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. 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. 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., Li, Z. F., and Sun, X. W., Analysis of the Resonant Cavities Using the FDTD Scheme with Effective Permittivities Formulae, International Journal of Electronics, vol. 92, no. 7, pp. 393-399, 2005.
Bao, X. L. and Ammann, M. J., Small Patch/Slot Antenna with 53% Input Impedance Bandwidth, Electronics Letters, vol. 43, no. 3, pp. 146-148, 2007.
Bao, X. L., Zhang, W. X., and Li, L. W., Analysis on the Dispersion Characteristics of Complex Medium PBG Structure by Using Non-Yee Grid FDTD Method, Chinese Journal of Radio Science, vol. 18, no. 4, 2003.
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., 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., Ruvio, G., and Ammann, M. J., Low-Profile Dual-Frequency GPS Patch Antenna Enhanced with Dual-Band EBG Structure, Microwave and Optical Technology Letters, vol. 49, no. 11, pp. 2630-2634, 2007.

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