Hi,

Hope everybody are good.

**Please find attached full question with diagrams.**

A coax-fed patch antenna with dimensions given in table below, is simulated in HFSS, CST and FEKO

softwares.

It is seen that:

The results of the CST software in the case of

- The phase Z component of the electric field on the line parallel to y axis

and

The results of the FEKO software in the case of

- The magnitude of X component of the electric field on the line parallel to y axis

- The phase of X component of the electric field on the line parallel to y axis

- The phase of Z component of the electric field on the line parallel to y axis

- The phase of Z component of the electric field on the line parallel to x axis

and

The results of the HFSS software in the case of

- The phase of X component of the electric field on the line parallel to y axis

- The phase of Z component of the electric field on the line parallel to y axis

are completely different from the results of the two other softwares (despite partial similarity of the field

behavior in other cases).

The question is why it is such different.