Elliptical Ring Antenna Excited by Circular Disc Monopole for UWB Communications

Table 3

Comparison of the performance of the proposed antenna with the current state of the art in UWB antennas.

Reference	Electrical size	Frequency range (GHz)	Fractional bandwidth (%)	Gain (dBi)
[3]	0.27λL × 0.27λL × 0.040λL	0.66–5.60	157.83	4.0–8.0
[4]	4.68λL × 4.68λL × 0.214λL	2.41–7.98	107.22	1.0–2.5
[5]	1.86λL × 3.1λL × 0.072λL	6.20–18.00	97.52	3.2–10.1
[6]	0.88λL × 0.88λL × 0.216λL	2.20–6.50	98.85	7.0–10.0
[7]	0.98λL × 0.98λL × 0.383λL	1.66–11.00	147.55	8.7–18.9
[8]	0.67λL × 0.67λL × 0.050λL	2.50–24.00	162.26	3.5–10.0
[9]	0.35λL × 0.35λL × 0.242λL	0.58–1.75	100.43	3.6–5.5
[10]	0.29λL × 0.29λL × 0.270λL	1.50–41.00	185.88	1.2–4.7
[11]	0.42λL × 0.42λL × 0.013λL	2.50–12.0	131.03	2.0–6.0
[12]	0.21λL × 0.29λL × 0.004λL	3.10–10.60	109.49	-1.0–3.0
[13]	0.21λL × 0.25λL × 0.013λL	2.38–11.80	132.86	2.8–5.6
[14]	0.19λL × 0.27λL × 0.002λL	2.85–11.85	122.45	−1.2–3.2
[15]	0.47λL × 0.53λL × 0.004λL	3.10–10.60	109.49	2.0–5.5
[16]	0.28λL × 0.30λL × 0.015λL	2.80–12.00	124.32	4.0–5.0
[17]	0.24λL × 0.36λL × 0.015λL	2.90–10.80	115.33	1.00–4.25
[18]	0.46λL × 0.43λL × 0.019λL	3.50–11.70	107.89	4.33–6.00
[19]	1.10λL × 1.20λL × 0.005λL	2.99–10.00	107.93	2.6–6.0
Proposed antenna	0.23λL × 0.27λL × 0.010λL	3.10–12.00	117.88	3.1–4.8

λ_L: the free-space wavelength corresponding to the lowest operating frequency of the antenna.