Figure 10
From: Analysis and Design of a Compact Leaky-Wave Antenna for Wide-Band Broadside Radiation

Measured 2-D far-field patterns in the azimuth and elevation. A single pencil-beam pattern at broadside is observed over an 8.7% bandwidth with conical-sector frequency beam scanning below and above 21.9 GHz and 23.9 GHz. Values shown in dB units and normalized to the observed maximum at each frequency.