Research on Multiple Switched Flat-Top Beam Smart Antenna
A novel method of multiple switched flat-top beam is proposed for solving the problem of unequal radiation in different directions of the same beam in the multiple switched beam smart antenna in this paper. Taking 4-element Quasi-Yagi antenna array for an example, the feed currents of 4-element flat-top beam antenna array are calculated by using Woodward-Rosen synthesis method. An improved 4 × 4 Butler Matrix feed network is designed by using the double-layer dielectric structure. The antenna array is simulated by HFSS simulation software. The simulated results show that, compared with the beams of uniform antenna array, the gain fluctuations of the flat-top beam antenna array are reduced by 6.4–25.9 dB in the main lobe, the sidelobe levels are reduced by 2.7–17 dB, and with the characteristics of small size and wide bandwidth.
KeywordsMultibeam Flat-top beam Smart antenna Butler Matrix
- 1.Bobor-Oyibo, F., Foti, S.J., Smith, D.: A multiple switched beam smart antenna with beam shaping for dynamic optimisation of capacity & coverage in mobile telecommunication networks. In: 2008 8th International Symposium on Antennas, Propagation and EM Theory, pp. 356–359. Kunming (2008)Google Scholar
- 2.Patidar, H., Mahanti, G.K.: QPSO for synthesis of linear array of isotropic antennas to generate flat-top beam including multiple null placement. In: 2015 International Conference on Signal Processing and Communication (ICSC), pp. 46–50. Noida (2015)Google Scholar
- 3.Fakoukakis, F.E., Kyriacou, G.A., Sahalos, J.N.: On the design of Butler-like type matrices for low SLL multibeam antennas. In: 2012 6th European Conference on Antennas and Propagation (EUCAP), pp. 2604–2608. Prague (2012)Google Scholar