In research papers on beam steering antennas, while the radiation pattern for the beam scanning plane (such as the horizontal or vertical plane) is typically presented, details regarding the orthogonal plane (perpendicular to the beam scanning direction) where the gain generally decreases are often omitted. for example, if the beam steering is observed in H plane , then E plane radiation pattern isn't mentioned .This omission is common, especially when the focus is primarily on demonstrating the primary beam steering characteristics.so , my question is how much fall in gain of the orthogonal plane( which is not showing beam steering) is acceptable?