A three sections circular waveguide aperture antenna with conical beam is presented. By using two waveguide steps, the aperture distribution of the antenna can be controlled to realize the requirements on the radiation pattern with conical beam including the flare angle, gain and the side lobe level. Through optimized design, the impedance bandwidth of 550MHz with -10 dB return loss, the gain of 8.1 dB and a flare angle of 50 degrees have been achieved at the central frequency 35 GHz. Good agreement has been observed between simulated results and measured ones. The proposed antenna is easy to be fabricated and suitable for many applications.
2. Guo, Y.-X., M. W. Chia, Z. N. Chen, and K.-M. Luk, "Wide-band L-probe fed circular patch antenna for conical-pattern radiation," IEEE Trans. Antennas Propag., Vol. 52, No. 4, 1115-1116, Apr. 2004.
doi:10.1109/TAP.2004.823971
3. Mcewan, N. J., R. A. Abd-alhameed, E. M. Ibrahim, P. S. Excell, and J. G. Gardiner, "A new design of horizontally polarized and dual-polarized uniplanar conical beam antennas for hiperlan," IEEE Trans. Antennas Propag., Vol. 51, No. 2, 229-237, Feb. 2003.
doi:10.1109/TAP.2003.809058
4. Chen, K.-C., Y. Qian, C.-K. C. Tzuang, and T. Itoh, "A periodic microstrip radial antenna array with a conical beam," IEEE Trans. Antennas Propag., Vol. 51, No. 4, 756-765, Apr. 2003.
doi:10.1109/TAP.2003.811064
5. Son, S.-H., S.-I. Jeon, C.-J. Kim, and W. Hwang, "GA-based design of multi-ring arrays with omnidirectional conical beam pattern," IEEE Trans. Antennas Propag., Vol. 58, No. 5, 1527-1535, May 2010.
doi:10.1109/TAP.2010.2044326
6. Safavi-naini, R. and R. H. Macphie, "On solving waveguide junction scattering problems by the conservation of complex power technique," IEEE Trans. Microw. Theory Tech., Vol. 29, No. 4, 337-343, Apr. 1981.
doi:10.1109/TMTT.1981.1130354
7. Macphie, R. H., M. Opie, and C. R. Ries, "Input impedance of a coaxial line probe feeding a circular waveguide in the TM01 mode," IEEE Trans. Microw. Theory Tech., Vol. 38, No. 3, 334-337, Mar. 1990.
doi:10.1109/22.45357
8. Shen, Z. and R. H. Macphie, "An improved modal expansion method for two cascaded junctions and its application to waveguide filters," IEEE Trans. Microw. Theory Tech., Vol. 43, No. 12, 2719-2722, Dec. 1995.
doi:10.1109/22.477853
9. Shen, Z.-X. and R. H. Macphie, "A simple method for calculating the reflection coefficient of open-ended waveguides," IEEE Trans. Microw. Theory Tech., Vol. 45, No. 4, 546-548, Apr. 1997.
doi:10.1109/22.566636
10. Jiang, Z., Z. Shen, and X. Shan, "Mode-matching analysis of waveguide j-junction loaded with an h-plane dielectric slab," Journal of Electromagnetic Waves and Applications, Vol. 16, No. 11, 1613-1614, 2002.
doi:10.1163/156939302X01029
11. Park, J. K., "Scattering analysis from a gap in the inner conductor of a coaxial line," Journal of Electromagnetic Waves and Applications, Vol. 17, No. 1, 121-129, 2003.
doi:10.1163/156939303766975399
12. Du, K., V. V. Varadan, and V. K. Varadan, "Estimation of reflection coefficients for an open-ended coaxial waveguide radiating into a chiral half-space," Journal of Electromagnetic Waves and Applications, Vol. 15, No. 5, 643-663, 2001.
doi:10.1163/156939301X00319
13. Anastassiu, H. T., J. L. Volakis, and D. C. Ross, "The mode matching technique for electromagnetic scattering by cylindrical waveguides with canonical terminations," Journal of Electromagnetic Waves and Applications, Vol. 9, No. 11-12, 1363-1391, 1995.
doi:10.1163/156939395X00118
14. Morgan, M. A. and F. K. Schwering, "Mode expansion solution for scattering by a material filled rectangular groove," Journal of Electromagnetic Waves and Applications, Vol. 12, No. 4, 467-468, 1998.
doi:10.1163/156939398X00890
15. Li, L. W., L. Zhou, M. S. Leong, T. S. Yeo, and P. S. Kooi, "An open-ended circular waveguide with an infinite conducting flange covered by a dielectric hemi-spherical radome shell: Full-wave analysis and green dyadics," Journal of Electromagnetic Waves and Applications, Vol. 13, No. 4, 561-563, 1999.
doi:10.1163/156939399X00303
16. Gentili, G. G., R. Nesti, and G. Pelosi, "Efficient analysis of a complete feeding system in corrugated circular waveguide," Journal of Electromagnetic Waves and Applications, Vol. 13, No. 12, 1631-1648, 1999.
doi:10.1163/156939399X00042
17. Silver, S., Microwave Antenna Theory and Design, 336-341, McGraw-Hill, New York, 1949.
Submit
