A Wide-Beam Metasurface Antenna Using Pattern Combination of Characteristic Modes

Abstract

In this paper, a new method based on characteristic mode analysis for designing wide-beam antennas is proposed. According to theory of characteristic modes, the total radiation pattern is the linear combination of modal currents. The phase of the excitation coefficient is demonstrated to be the characteristic angle. To get a wide-beam pattern, a fundamental mode and an even mode are selected to be excited and combined. The method is verified by the proposed antenna. First, two modes are selected based on characteristic mode analysis. Then the modes are excited separately using different feeding networks. Lastly, a 1-to-3 power divider is proposed to combine the feeding networks. The proposed antenna has a 3-dB beamwidth of over 200∘ in both 45∘ and 135∘ planes. The results have shown that the proposed antenna is suitable for a wide range of detection applications.

Novel Characteristic Mode Basis Functions Accelerating Iteration Convergence of CMM for Analyzing Electromagnetic Scattering Problems

“…It is particularly suitable for the analysis of multi-excitation problems. Thus, the CM theory is widely used in the design and simulation of antennas [10][11][12][13], while it is rarely applied in the analysis of electromagnetic scattering problems. The traditional CM method (CMM) [14] presents a high computational complexity and low efficiency in solving CMs.…”

A Dual-Band Low-Profile Microstrip Antenna with Fan-Shaped and Rectangular Beams

“…Based on the above discussion, a method of widening the beam width of low profile dual-frequency antennas by using the combination of characteristic modes is proposed. First, characteristic modal analysis (CMA) [23][24][25] is performed on the rectangular patch, and then the required mode is excited to resonate at the same frequency point. Finally, the lower band E-plane HPBW is successfully broadened, while the rectangular beam is radiated in the upper band.…”