Microstrip resonator with shape deformation has been analysed using th
e finite element method (FEM). Keeping the front surface of the micros
trip resonator fixed, the back surface is deformed. Five cases of the
deformation of the back surface are considered: (i) the left vertical
side of the back surface is shifted inward; (ii) both vertical sides o
f the back surface are shifted inward; (iii) the right vertical side o
f the back surface is shifted outward; (iv) both vertical sides of the
back surface are shifted outward; (v) left vertical side of back surf
ace is shifted inward and the right vertical side of it is shifted out
ward. Variation in cutoff frequency for the TM011, TM110, TM111, TM012
, TM112 and TM210 is observed.