Yagi Array of Microstrip Quarter-Wave Patch Antennas with Microstrip Lines Coupling

Table 2

Comparisons between the Yagi array of quarter-wave patch Antennas and the Yagi array of half-wave patch antennas.

Character	Yagi array of quarter-wave patch antennas (Figure 1)	Yagi array of half-wave patch antennas (Figure 9)
Band	4.68–5.24 GHz	5.0–5.43 GHz
Fractional bandwidth	11.3%	8.25%
Beamwidth (elevation plane)	56–58°	42–46°
Beamwidth (azimuth plane)	44–60°	80–87°
Gain	8.65–9.9 dBi	8.28–10.19 dBi
Front-to-back ratio	>10 dB	>7.4 dB
Radiation angle (from broadside)	45–50°	35–40°
Radiation efficiency	91–98%	95–99%
Size of driven patch	8.926 × 40 mm^2	17.6 × 25 mm^2
Size of ground plane	100 × 80 mm^2	115 × 80 mm^2