Momentum2Radiation Patterns and Antenna Characteristics Planar (Vertical) Cut For the planar cut, the angle phi, which is relative to the x-axis, is kept constant. The angle theta, which is relative to the z-axis, is swept to create a planar cut. Theta is swept from 0 to 360 degrees. This produces a view that is perpendicular to the circuit layout plane. Figure 8-2 illustrates a planar cut. Z axis theta Y phi X Figure 8-2. Planar (vertical) cut Conical Cut For a conical cut, the angle theta, which is relative to the z-axis, is kept constant. Phi, which is relative to the x-axis, is swept to create a conical cut. Phi is swept from 0 to 360 degrees. This produces a view that is parallel to the circuit layout plane. Figure 8-3 illustrates a conical cut. Z axis phi theta (half angle opening) X Y ……