A Band-Rejection Vivaldi Antenna with High Selectivity Using Hybrid HRW/CCLL

Table 1

Comparison of the proposed antenna with other reported references.

Antennas	Coupling structure	Dimension (mm)	Bandwidth (GHz)	Rejection band (GHz)	Max gain (dBi)	Selectivity/roll-off
[24]	SIR	27.5 × 18	2.78–12.3	5–5.9	—	0.33
[25]	C-shaped strip	20 × 20	3.04–10.87	5.03–5.94	<4.5	—
[26]	SRR/CPW	47 × 37	2.8–13.5	5.1–6.1	<4	<0.6
[27]	CSRR	68 × 35	3.1–10.65	3.35–3.55 5.65–5.95	4.2	—
[28]	SRR/CSRR,/DGS	30 × 28	3–10	3.3–3.6 5.15–5.82 7.0–8.5	5	<0.5
[29]	RPR	30 × 22	2.98–12	3.26–3.82 5.01–5.75	7.05	—
[30]	TAR	29 × 20.5	2.98–10.76	3.5, 5.5	<6	—
Proposed work	HRW/CCLL	73 × 45	2.6–13.7	4.49–6.64	9.8	0.67

SIR: step impedance resonator, SRR: split-ring resonator, CPW: coplanar waveguide, CSRR: complementary split-ring resonator, DGS: defected ground structures, RPR: rectangular parasitic resonator, TAR: triarm resonator.