“…Gas sensors are able to detect their presence and type, and they are very useful in industries 39,40 . The various methods used in the papers include rat race coupled, 41 parallel coupled, 42 phase variation, 43 near‐field self‐injection‐locked and spiral bandgap, 44 GaAs monolithic microwave integrated circuit, 45 coplanar waveguide‐fed wearable antenna, 46 ring loaded monopole antenna, 47 wireless networks, 48,49 and split‐ring resonators (SRR) 50–52 . In Ebrahimi et al, 53 the dielectric properties of the samples are determined using a complementary SRR (CSRR) structure.…”