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Bandwidth enhancement of spiral antenna with defected ground structure

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Figure

Figure 2.1: Various DGSs: (a) spiral head (b) arrow head slot (c) “H” shape slots (d) asquare open-loop with a slot in middle section (e) open loop dumbbell & (f) IDC DGS.
Figure 2.2 illustrates examples of the wideband frequency independent spiral antennas.
Figure 2.3: The reflection coefficient of Wideband antenna [17].
Figure 2.4:Radiation Patterns: (a) Omni-directional and (b) Unidirectional [17].
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