Table 13.

A comparison between proposed metamaterial design and previous studies.

Referencess	Dimension (mm)	Characteristic	Resonance frequencies	Band	Reduction (%)
34	AC: 44.4 × 33.3	Double-negative	900 and 1800 MHz	Double	1 g: 43 and 44
35	AC: 187 × 117	Double-negative	2100 MHz	Single	1 g: 35.93
36	AC: 54.72 × 39	Double-negative	900 and 1800 MHz	Double	1 g: 40 and 49
37	AC: 36 × 36	Double-negative	900 and 1800 MHz	Double	1 g: 14.23 and 15.3
Proposed	AC: 14 × 28	Left-handed	1.246, 3.052, 3.794, and 4.858 GHz	Quadruple	1 g: 26.22 22.56, 61.16 and 8.45