Fig. 8
From: Design and development of multiband PIFA antenna for vehicular LTE/5G and V2X communication
Radiation pattern realized gain in dBi. The figure shows the 3-D plot of radiation pattern. The radiation pattern realized gain in dBi is a metric used to quantify the directivity of an antenna and is expressed in decibels relative to an isotropic radiator. This PIFA antenna exhibited an all-out gain of 7.08 dBi at a frequency of 5.5 GHz, with gains of 6.78 dBi at 3.8 GHz, 3.31 dBi at 1.7 GHz, 6.81dBi at 5.2 GHz, and 6.65 dBi at 5.9 GHz