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

Table 1

Performance summary of the antenna with the same 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	1.06	0.98 × 0.98 × 0.054	47.55 (4.68–7.6 GHz	21.5 (4.9–6.08 GHz)	10.5
2.2	2.2	0.76 × 0.76 × 0.042	33.14 (3.75–5.24 GHz)	18.61 (3.85–4.64 GHz)	8.96
3.38	3.38	0.69 × 0.69 × 0.038	30.4 (3.48–4.73 GHz)	17.89 (3.51–4.2 GHz)	7.88