CMA based optimization of a conformal multiband slotted monopole antenna
摘要
This paper presents the design and analysis of an multiband uniform metasurface antenna. The proposed metasurface comprises a three-by-three array of identical circular radiating elements with cross-slot configurations. Characteristic Mode Analysis (CMA) is employed to investigate and optimize the antenna’s inherent resonant behaviour. Key CMA parameters, including modal significance, characteristic angle, and eigen value responses, are analyzed to identify and excite the dominant modes. Surface current distributions are further examined using CMA, and a micro strip line feeding technique is implemented to efficiently excite the desired operating frequency bands. The proposed antenna exhibits multiple resonant frequencies at 5.5 GHz, 6.3 GHz, 10.0 GHz, 17.4 GHz, and a wideband response spanning 19.5 GHz to 30 GHz, making it suitable for 5G and advanced wireless communication applications. The antenna achieves an average gain of approximately 10 dBi with a radiation efficiency of 85%. Additionally, a conformability analysis is conducted under various bending conditions, and the simulated results demonstrate good agreement, confirming the antenna’s stable performance under deformation.