Fig. 1. Structural diagrams of U-slot microstrip patch antenna. (a) Three-dimensional structural diagram; (b) top view

Fig. 2. Diagram of system model architecture

Fig. 3. Impact of ls on the spectrum of S-parameter

Fig. 4. Impact of t2 on the spectrum of S-parameter

Fig. 5. Prediction effect of forward S-parameter spectrum of the model. (a) Actual S-parameter spectrum and predicted S-parameter spectrum for sample 1; (b) actual S-parameter spectrum and predicted S-parameter spectrum for sample 2

Fig. 6. Prediction effect of reverse structural parameters

Fig. 7. Prediction effect of reverse structural parameters by the model. (a)(c)(e) S-parameter spectra predicted by the model; (b)(d)(f) actual structural parameters corresponding to the structural parameters and S-parameter predicted in reverse

Fig. 8. Structural diagram of low-profile broadband metasurface antenna

Fig. 9. Prediction effect of forward S-parameter spectrum of the model

Fig. 10. Prediction effect of reverse structural parameters

Fig. 11. Prediction effect of reverse structural parameters by the model. (a) S-parameter spectrum predicted by the model; (b) actual structural parameters corresponding to structural parameters and S-parameter predicted in reverse