Geometry problem: connect feed to cylindrical cavity resonator

Hi! I need to connect a coaxial cable not on the two parallel face but on the straight line (as you can see in the picture). I have tried to make it with no luck because the electric fields is confined in the feed and the cavity is not excited ( as you can see in the picture). The parameters of the cavity should be:

- Cavity has air inside and PEC as boundary;
- Cavity has 120 mm radius and 251 width because should be designed by considering fundamental TE mode;
- In materials, cavity and inner conductor have air but outer coax has material (2.1 epsilonr , 1 mur, 0 sigma);

Thanks in advance