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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., 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., 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., 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. and Ammann, M. J., Differentially-fed Microstrip Patch Antenna for Omni-directional GPS Application, in LAPC - Loughborough Antennas & Propagation Conference, Loughborough, UK, 2013, pp. 18-21.
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., 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., 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., 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. 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. 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., 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., Yang, K., O’Conchubhair, O., and Ammann, M. J., Differentially-fed Omnidirectional Circularly Polarized Patch Antenna for RF Energy Harvesting, in European Conference on Antennas and Propagation - EuCAP, Davos, Switzerland, 2016.
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., 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.
Bao, X. L. and Zhang, W. X., A Hybrid GMT/PO Method For Calculating the NDC of the Irregular Edge of a Semi-Infinite Circular Cylinder, Microwave and Optical Technology Letters, vol. 31, no. 2, pp. 108-110, 2001.
Bao, X. L., Zhang, W. X., and Li, L. W., PSTD Analysis For Dispersion Characteristics of PBG Structure In Complex Medium, in The Progress in Electromagnetics Research Symposium, Singapore, 2003.
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., Dual-band GPS Patch Antenna based on Dual-band Fractal EBG Technique, in LAPC - Loughborough Antennas & Propagation Conference, Loughborough, UK, 2006, pp. 53-56.

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