Microstrip line :
![[Layer]](img/img_microstrip/layer_microstrip.gif)
Wadell formula :
![[Wadell Z0 Formula]](img/img_microstrip/wadell_microstrip_z0.gif)
The equation for Z0 are accurate to within 2% for any Er, w
See Hammerstad formula for Eeff equation.
cf: Wadell, Brian C - Transmission Line Design Handbook Artech House 1991
Hammerstad formula :
Hammerstad Hypothesis is t/h < 0.05. So an proposition is given to correct equation following h parameter.
![[Hammerstad Formula]](img/img_microstrip/hammerstad_microstrip.gif)
The equation for Eeff are accurate to within 1% for:
Er ≤ 16 (< 2% if Er > 16)
0.05 ≤ w/h ≤ 20 (< 2% if w/h < 0.05)
IPC formula :
![[IPC-2141 Formula]](img/img_microstrip/ipc_microstrip_z0.gif)
The rough accurate is within:
| 5% | for 0.1 < w/h < 0.2 |
| 2% | for 0.2 < w/h < 1.5 |
| 5% | for 1.5 < w/h < 2.0 |
| 10% | for 2.0 < W/h < 2.7 |
| 15% | for 2.7 < w/h < 3.0 |
IPC - Association Connecting Electronics Industries - www.ipc.org
π LC model :
![[L equation]](img/img_microstrip/clemm_microstripe_L.gif)
![[C equation]](img/img_microstrip/clemm_microstripe_C.gif)
![[TLM PI]](img/img_microstrip/tlm_pi.gif)