abhi_kolkata
Member level 5

HFSS simulation problem
hi,
i was trying to simulate a grounded CPW with interdigital capacitors over quartz(permittivity = 3.8)substrate.when i simulate only the grounded CPW , without the interdigital capacitors, it gives result that is quite close to the designed value(Z0 = 98 ohm).but when i put the interdigital capacitors (in the gap between the centerconductor and coplanar ground on both the sides of center conductor) to load the line and bring its Z0 down , the simulation results show no (almost none) difference from that without capacitors, while theoritically Z0 should come down.
i don't understand why is that happening.anybody plz help me with it.
eagerly waiting for replies.
with regards
abhi
hi,
i was trying to simulate a grounded CPW with interdigital capacitors over quartz(permittivity = 3.8)substrate.when i simulate only the grounded CPW , without the interdigital capacitors, it gives result that is quite close to the designed value(Z0 = 98 ohm).but when i put the interdigital capacitors (in the gap between the centerconductor and coplanar ground on both the sides of center conductor) to load the line and bring its Z0 down , the simulation results show no (almost none) difference from that without capacitors, while theoritically Z0 should come down.
i don't understand why is that happening.anybody plz help me with it.
eagerly waiting for replies.
with regards
abhi