“…Various shapes of both slots and feeding parts can be used to easily achieve broad bandwidth operations. For example, the trapezoid slot structures with various exciting stubs were employed to design printed slot antennas [12][13][14], resulting in extremely large impedance bandwidths. The semi-elliptic slot ground plane with a semi-ellipse patch was also proposed for wideband operation [15].…”
“…Various shapes of both slots and feeding parts can be used to easily achieve broad bandwidth operations. For example, the trapezoid slot structures with various exciting stubs were employed to design printed slot antennas [12][13][14], resulting in extremely large impedance bandwidths. The semi-elliptic slot ground plane with a semi-ellipse patch was also proposed for wideband operation [15].…”
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