Highly Efficient Ultra-Wide Band MIMO Patch Antenna Array …
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Fig. 3 Gain versus frequency
Table 2 Measured performance parameters for terahertz antenna of Stage 1st, 2nd and 3rd
Antenna
design
Resonating
frequency
(THz)
Reflection
coefficient
(dB)
Radiation
efficiency (%)
Gain
(dB)
Directivity
(dB)
Bandwidth
(%)
Antenna at
1st stage
0.822
−14.08
69.8
7.43
8.85
8.91
Antenna at
2nd stage
0.642
−23.44
75.42
4.13
5.32
12.14
0.878
−33.62
72.45
6.84
8.22
27.08
Antenna at
3rd stage
0.658
−35.93
75.14
4.38
5.62
57.96
0.858
−60.14
72.85
7.13
8.49
(a) Surface current density at 0.65THz
(b) Surface current density at 0.85THz
Fig. 4 Surface current distribution for elliptical octagonal patch antenna at both resonating
frequency