Phase and amplitude of E field in Frequency domain

[MedericQUT]

Hi All,
I try to setup the simple simulation of all to understand the dta format of OpenEMS. See below:

`
%% setup FDTD parameter & excitation function %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
FDTD = InitFDTD('NrTS', 1*1e4);
FDTD = SetSinusExcite(FDTD,f_0);
% boundary conditions
BC = [3 3 3 3 3 3];
FDTD = SetBoundaryCond(FDTD,BC);

%unrelevant code missing for clarity....

%% add the dipol %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
start = [mesh.x(15) mesh.y(8) mesh.z(3)];
stop = [mesh.x(15) mesh.y(8) mesh.z(12)];
CSX = AddExcitation(CSX,'excite',1,[0 0 1]);
CSX = AddBox(CSX,'excite',1 ,start,stop);

%unrelevant code missing for clarity....

%% define dump box... %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CSX = AddDump(CSX,'E_dump_f','DumpType',10,'FileType',1,'Frequency',f_0);
start = [mesh.x(1) mesh.y(1) mesh.z(1)];
stop = [mesh.x(end) mesh.y(end) mesh.z(end)];
CSX = AddBox(CSX,'E_dump_f',1 , start,stop);

WriteOpenEMS([Sim_Path '/' Sim_CSX],FDTD,CSX);
RunOpenEMS(Sim_Path, Sim_CSX);

%% read data
[field mesh_h5] = ReadHDF5Dump([Sim_Path '/E_dump_f.h5']);
%Ez along the Z mid plane
Ez = squeeze(field.FD.values{1}(:,:,9,3));
`

When i plot the real part of Ez it looks correct:

But if i look into the details of amplitude and phase, they have 'discrete' value.
Does this look normal to you?

Kind regards :)