A Miniaturized Dual-Band Short-Ended ZOR Antenna with Backed Ground Plane for Improved Bandwidth and Radiation Efficiency

Table 1

Comparison of dual-band MTM antennas with recently published work.

Ref.	Antenna size	Resonance frequency (GHz)	Via process	−10 dB impedance bandwidth (%)	Gain (dBi)	Radiation efficiency (%)
[13]	0.27λ0 × 0.23λ0	2.6/3.6	Not needed	2.29/28.57	0.53/1.98	NA^#/NA^#
[16]	0.33λ0 × 0.098λ0	2.45/3.37	Not needed	8.16/23.74	0.3/1.1	68/77.3
[24]	1.05λ0 × 1.05λ0	6.6/10.9	Needed	3.03/5.04	7.29/2.97	NA^#/NA^#
[25]	1.27λ0 × 1.27λ0	1.73/5.36	Not needed	17.34/11.75	8.23/8.30	NA^#/NA^#
[26]	0.021λ0 × 0.018λ0	0.91/2.45	Needed	17.8/35.8	−17.1/−9.81	NA^#/NA^#
[27]	0.35λ0 × 0.45λ0	2.58/5.41	Not needed	20.6/15.7	3.5/3.53	NA^#/NA^#
PW	0.22λ0 × 0.14λ0	2.72/4.58	Not needed	5.50/41.57	0.72/2.0	71.52/84.02

NA^# = not available, PW = proposed work.