Effect of unit cell arrangements in near field transformation lattice on aperture efficiency of resonant cavity antenna

Publication Type:
Conference Proceeding
Proceedings of the 2019 21st International Conference on Electromagnetics in Advanced Applications, ICEAA 2019, 2019, 00, pp. 370-371
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© 2019 IEEE. Near field phase transformation lattice structure is presented to correct the electric field phase variation above a source antenna. A high gain resonant cavity antenna (RCA) is used as a source, which operates at 12 GHz. The 3D printed phase transformation structure, with two different arrangements of the unit cells, is designed above the RCA at the one-eighth of wavelength. The rectangular arrangement exhibits a more uniform field distribution than that of the circular arrangement. Additionally, in the rectangular arrangement, the gain of the antenna is enhanced by 2.11dB from 21.98 to 24.09 dBi, whereas in the circular arrangement, this value increased by 2.08 dB from 21.98 to 24.06 dBi. For both the cases, the aperture efficiency and bandwidth aperture efficiency product (BAEP) increased from 34.24 to 55.78% and 55.024 to 109.33%2, respectively.
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