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Microstrip Substrate Definition: MSUB

Symbol

Topology

Parameters

Name Description Unit Type Default
Er Relative dielectric constant   Er[1]
H Substrate thickness Length H[1]
T Conductor thickness Length T[1]
Rho Metal bulk resistivity normalized to gold   Rho[1]
Tand Loss tangent of dielectric   0
ErNom[2] Nominal relative dielectric constant   Er[1]
Name Substrate name Text SUB

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory.

[2] See “X-model Tables Shipped with the AWR Design Environment” for a list of available X-model tables.

Implementation Details

Er is the permittivity of the substrate material relative to the permittivity of free space ε0 = 8.854*10-12 F/M

ErNom represents the nominal dielectric constant of the substrate relative to free space and is used only by X-Models where all EM data is collected at Er_Nom and a variational approach is used to estimate the performance for small variations in Er about Er_Nom. See “How to Properly Set Up Substrate Parameters for X-models” for details.

Tand is the dielectric loss tangent of the substrate material: Tand = εr″/εr′ where εr = εr′ -jεr

Rho is the bulk resistivity of conductor metal normalized to gold (to 2.44 x 10 -8 Ω*m)

Actual metal bulk resistivity = Rho*2.44 x 10 -8 Ω*m.

H and T are cross-sectional dimensional variables given in default length units.

In a schematic that contains microstrip elements, at least one instance of this element must exist. The Name parameter provides a unique identifier for each instance of MSUB. The microstrip elements have an MSUB parameter that indicates which MSUB element to use.

Note that you can also add this substrate to the Global Definitions window and then reference the material from any schematic.

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 MSUB

BENDS COMPONENTS COUPLED LINES INTERCONNECTS JUNCTIONS
MBENDA TFRM M2CLIN WIRE1 MCROSS
MBEND90X TFR MACLIN WIRE2 MCROSSX
MCURVE TFCM MCFIL   MSTEP
MBENDRWX TFC2 MCLIN   MSTEPX
  MRINDSBR MLANGE   MTEE
  MRINDNBR MXCLIN   MTEEX
  MCINDN      
  MCINDS      
  MICAP      
  MICAP1      
  MICAP2      
  MICAP3      
  TFCMP      
LINES OTHER OBSOLETE PWRDIVIDER
MCTRACE MDRSTUB MBEND MBLCOUP
MLEF MGAP2 MBEND2 MLANGE1
MLEFX MOPEN MBEND3 MRRCOUP
MLIN MOPENX MBENDR WILKE1
MLSC MSRSTUB2 MGAP WILKE2
MTAPER MRSTUB2 MLOC WILKN1
MTRACE ABRIDGE MSTEP2 WILKN2
MTRACE2 MDRSTUB2 MSTEPO  
  MGAPX MRSTUB  
    MSRSTUB  

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