Compact Wideband Dual-Frequency Antenna Based on a Simplified Composite Right/Left-Handed Transmission Line with Hilbert Curve Loading

Table 1

Comparison of the performance parameters of the antenna designed in this paper with those of other antenna designs presented in the literature.

Comparison category	This work		Narbudowicz et al. [4]		Jang et al. [11]	Lai et al. [12]
Electronic size	0.24λ0 × 0.15λ0 × 0.006λ0		0.28λ0 × 0.28λ0 × 0.006λ0		0.145λ0 × 0.172λ0 × 0.011λ0	0.33λ0 × 0.33λ0 × 0.018λ0
Transmission line	APW SCRLH		CRLH		CRLH	CRLH
With/without through holes	Without		With		Without	With
Mode of operation	ZOR	FOR	ZOR	FOR	ZOR	ZOR
Operating frequency (GHz)	1.867	2.835	1.329	2.756	2.03	3.38
Relative bandwidth (%)	10.1	11.5	1.35	2.02	6.8	0.1
Peak gain (dB)	1.86	1.97	−0.7	−0.2	1.35	0.87
F.O.M.	0.0409	0.0129	−0.16	−0.007	0.058	1.524
Radiation efficiency (%)	81.3	74.2	Not given		62	70