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Two-Layer Microstrip Substrate Definition: MSUB2

Symbol

Summary

MSUB2 provides two-layer substrate definition used for microstrip schematic elements. Substrate is backed by infinite ground plane; no cover is present over the substrate. Lower layer may have conductive loss.

Topology

Parameters

Name Description Unit Type Default
Er1 Relative dielectric constant of upper layer   Er1
Er2 Relative dielectric constant of lower layer   Er[1]
Tand1 Loss layer tangent of upper layer   0
Tand2 Loss layer tangent of lower layer   0
Sig2 Bulk conductivity of lower layer in S/m   0
H1 Height of upper layer Length H[1]
H2 Height of lower layer Length H[1]
T Conductor thickness Length T[1]
Rho Metal bulk resistivity relative to gold   1
Name Substrate name text MSUB1[2]

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory. See the AWR Microwave Office Layout Guide for details.

[2] Modify only if schematic contains multiple substrates. See “Using Elements With Model Blocks” for details.

Parameter Details

T. Line models based on MSUB2 use the same thickness T for all line conductors. EM quasi-static models accept negative T: in this case, model implies that conductors is recessed into underlaying layer.

Rho. Line models based on MSUB2 use the same metal bulk resistivity relative (normalized) to resistivity of gold for all line conductors.

Parameter Restrictions and Recommendations

Sig2. EM quasi-static models based on MSUB2 imply that bulk conductivity of lower layer Sig2 must be less or equal to 3 S/m due to approximation used for evaluation of substrate conductance loss. Unrestricted substrate conductance is provided by Finite Element Method (FEM) based models FM1LIN, FM2CLIN, FMRIND, FMOCIND (use substrate FMSUB).

Recommendations for Use

MSUB2 must either be present on the schematics that contain elements using MSUB2 or be placed in the Global Definitions window. In the latter case, models using a global definition of MSUB2 must refer to it explicitly.

Layout

This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

Elements Used with MSUB2

OTHER LINES COUPLED LINES
MXOVER MM1LIN MM2CLIN
  SIGCMOSX MMBCPL

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