Fig. 1. Antenna geometry (a) front side and (b) back side.
Fig. 2. Simulated current distributions at resonant frequency 7.9 GHz front side (a) and back side (b).
Fig. 3. Simulated input impedance of the proposed antenna (HFSS only).
Fig. 4. Equivalent circuit model of the proposed antenna.
Fig. 5. Impedance (red line) of the proposed antenna depicted on smith chart (obtained from ADS tool).
Fig. 6. Manufactured proposed antenna (a) front side and (b) back side.
Fig. 7. Simulated and measured reflection coefficients vs. frequency.
Fig. 8. Quality factor of the proposed antenna determined using the two methods, (14) and (15).
Fig. 9. Simulated radiation efficiency and peak gain.
Fig. 10. Simulated group delay (ns) and front to back ratio vs frequency.
Fig. 11. Simulated radiation pattern at (a) 4.9 GHz, (b) 9.8 GHz, (c) 14 GHz and measured radiation pattern at (d) 4.9 GHz, (e) 9.8 GHz, (f) 14 GHz resonance frequencies of the proposed antenna.
Fig. 12. General setup of patch antenna proposed for image detection.
Table 1. Optimized dimensions of proposed antenna
Table 2. Performance comparison of proposed antenna