Substrate Dielectric Constant Effects on the Performances of a Metasurface-Based Circularly Polarized Microstrip Patch Antenna

Table 2

Performance summary of the antenna with different dielectric constants for both the lower and upper substrates.

Lower substrate dielectric constant, εr1	Upper substrate dielectric constant, εr2	Antenna size ()	|S11| ≤ −10 BW (%)	AR BW (%)	Peak gain (dBic)
1.06	2.2	0.82 × 0.82 × 0.046	44.54 (4.1–6.45)	17.39 (4.2–5.0)	9.31
2.2	1.06	0.91 × 0.91 × 0.051	36.6 (4.52–6.55)	19.55 (4.66–5.67)	10.16
1.06	3.38	0.73 × 0.73 × 0.040	25.9 (3.73–4.84)	14.47 (3.78–4.37)	8.46
3.38	1.06	0.82 × 0.82 × 0.046	17.39 (4.2–5.0)	17.39 (4.2–5.0)	9.69