To plot electric field with CST Microwave Studio software in 2D E-plane and H-plane, the steps are given below:
1. Define the field monitors at different frequencies (consider type : E-field or H-field or far-field)--> Simulate
2. Go to far-fields--> far-field plot---> properties--->select plot type 2D (you can change plot mode like polar, Cartesian, 2D, 3D) ---> select plot mode (you can change plot mode like directivity, gain (IEEE), Realized gain, E-field, E-pattern, H-field, power pattern) --> choose E-field---> OK.
3. Decide the plane in which your structure is designed (Generally, xz-plane (phi = 0 degree), yz-plane (phi = 90 degree) considered when the geometry is designed in xy-plane).