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Naseri, P., Matos, S., Lima, E. B., Costa, J. R., Fernandes, C. A. & Fonseca, N. J. G. (2019). Efficient evaluation of gradient transmit-arrays through an equivalent dispersive dielectric description. IEEE Transactions on Antennas and Propagation. 67 (9), 5997-6007

P. Naseri et al.,  "Efficient evaluation of gradient transmit-arrays through an equivalent dispersive dielectric description", in IEEE Transactions on Antennas and Propagation, vol. 67, no. 9, pp. 5997-6007, 2019

@article{naseri2019_1732414891475,
	author = "Naseri, P. and Matos, S. and Lima, E. B. and Costa, J. R. and Fernandes, C. A. and Fonseca, N. J. G.",
	title = "Efficient evaluation of gradient transmit-arrays through an equivalent dispersive dielectric description",
	journal = "IEEE Transactions on Antennas and Propagation",
	year = "2019",
	volume = "67",
	number = "9",
	doi = "10.1109/TAP.2019.2916761",
	pages = "5997-6007",
	url = "https://ieeexplore.ieee.org/document/8718491"
}

TY  - JOUR
TI  - Efficient evaluation of gradient transmit-arrays through an equivalent dispersive dielectric description
T2  - IEEE Transactions on Antennas and Propagation
VL  - 67
IS  - 9
AU  - Naseri, P.
AU  - Matos, S.
AU  - Lima, E. B.
AU  - Costa, J. R.
AU  - Fernandes, C. A.
AU  - Fonseca, N. J. G.
PY  - 2019
SP  - 5997-6007
SN  - 0018-926X
DO  - 10.1109/TAP.2019.2916761
UR  - https://ieeexplore.ieee.org/document/8718491
AB  - The growing popularity of transmit-arrays (TAs) for various antenna applications is calling for effective analysis and optimization methods. TAs are, usually, electrically large, comprising thousands of unit-cells formed by subwavelength metallic scatterers. Full-wave optimization cycles needed to meet stringent specifications in terms of gain, cross-polarization, bandwidth, scan-loss, etc., may be impaired by unrealistically required computational time and memory resources. To overcome this, we propose a modified homogenization method that, unlike other approaches, captures the internal reflections in the unit-cells and its resonances for each polarization, thus, correctly describing unit-cells’ frequency response in the band of interest. We define equivalent dispersive anisotropic media for gradient TAs. These surrogate models enable fast analysis and optimization of TAs without compromising the accuracy. As an example, we analyze a TA composed of phase rotation (PR) unit-cells. PR unit-cells present wideband low axial ratio for a TA but challenge the validation of existing homogenization methods. Detailed general description of the method is provided so that it can be applied to other unit-cells and avoid training time and resources required for machine learning-based methods. Using the surrogate cells, the full-wave analysis time and memory of the TA reduces 13 and 4 times, respectively.
ER  -