My plan is to fabricate a conformal microstrip patch antenna. I am going through the simulation works first. I already simulated the planar antenna. Now I am trying to simulate it with different bending angles. But, I found that the antenna does not show a good impedance matching for a smaller bending angle, but it shows proper impedance matching for a larger bending angle. Could anyone explain the reason, please? Also, how can I get the impedance matching at a smaller bending angle?