Some operations with the Distributed RC Transmission line model (RCLIN)

(found on the TLINE menu)

The input variables for the RCLIN model are R, C, L, U (units of L or C)

In comparison of two different RCLIN models, the two will be equivalent if:

R1L1 = R2L2 (taking care to note numerical value AND units for L1, L2)

and

C1L1 = C2L2 (again taking care to properly address numerical value AND units for L, C)

See schematic SCH1. Equivalence between line 2-1 and line 3-4 exists because net

inductance is same. Graph1 shows S21 and S11 traces from both lines on SCH1.

Note: Two linear analyses were used simply to facilitate easier demonstration that both

lines on SCH1 are producing identical results.

Next, consider schematic SCH2.

Note that, compared to SCH1, both R and C are increased by a factor of 1000.

Therefore, in order for the product of RL(sch1) to equal RL(sch2), the L of sch2

must be decreased by the same factor. L(sch2) = 1/1000 * L(sch1) = 0.002 in

Note also that the product CL of sch1 equals CL of sch2, thus the RCLIN on sch2

produces same results, shown on graph2.

[file]98788_rclin_v403_jm2.wsp[/file]

(found on the TLINE menu)

The input variables for the RCLIN model are R, C, L, U (units of L or C)

In comparison of two different RCLIN models, the two will be equivalent if:

R1L1 = R2L2 (taking care to note numerical value AND units for L1, L2)

and

C1L1 = C2L2 (again taking care to properly address numerical value AND units for L, C)

See schematic SCH1. Equivalence between line 2-1 and line 3-4 exists because net

inductance is same. Graph1 shows S21 and S11 traces from both lines on SCH1.

Note: Two linear analyses were used simply to facilitate easier demonstration that both

lines on SCH1 are producing identical results.

Next, consider schematic SCH2.

Note that, compared to SCH1, both R and C are increased by a factor of 1000.

Therefore, in order for the product of RL(sch1) to equal RL(sch2), the L of sch2

must be decreased by the same factor. L(sch2) = 1/1000 * L(sch1) = 0.002 in

Note also that the product CL of sch1 equals CL of sch2, thus the RCLIN on sch2

produces same results, shown on graph2.

[file]98788_rclin_v403_jm2.wsp[/file]