The figure compares the measured and computed
patterns of the DR antenna above the finite size ground
plane. The dimensions are a=0.1706l, a/h=1.67,
rf/a=0.95 (radial probe displacement), er=8.9 and a
circular ground plane of radius 1.279l. Solid line is the
computed E-plane pattern, short dashes are the
computed H-plane pattern. They compare closely with
the measured data.