Authors:
Zhishu Qu; James R.Kelly; Yue Gao
Published in:
IEEE Transactions on Antennas and Propagation ( Volume: 70, Issue: 3, March 2022)
Abstract:
This communication presents a theoretical study that establishes the performance limits for a multilayer transmitarray unit cell. This is the first study to be applicable to unit cells in which the conducting resonators, on the different layers, are shaped differently. A theoretical calculation is derived at the beginning. The theoretical calculations predict that, for an S 21 amplitude of −1 dB, unit cells having two and three conducting layers provide a phase shifting range of 170° and 360°, respectively. In addition, for a given phase shifting range of S 21 , a new methodology for analyzing the maximum S 21 amplitude, based on different substrates, is proposed. For the first time, we prove that it is efficient to attain the maximum S 21 amplitudes by employing a smaller substrate permittivity or a quarter-of-wavelength substrate electrical thickness. Finally, the theoretical calculations have been validated through computer simulation.