Stripline

Currently the standard library includes several components in the stripline tool box. A tool box is just a directory with the description of models in it.

Remember the arguments are case sensitive. You can use units.

Properties (TinyCAD only)

These values are translated into the variable block on the text file version of Mason. If you are manually writing the Mason file, you probably want to add these values to the variable block yourself to maintain consistency throughout the design.

  1. eps_r: the permittivity of the dielectric

  2. height_b: the dielectric height between grounds (in meters)

  3. height_c: height to the ceiling (in meters)

  4. loss_tan: the loss tangent of the material

  5. cu_thickness: thickness of the copper (in meters)

  6. cu_sigma: the conductivity of the metal (Siemens per meter)

  7. offset_s: the offset of the stripline from true center (in meters)

  8. pcb_layer: the layer on which the artwork will be generated

sline

    1. This is a straight low loss stripline. In TinyCAD many of these values are set equal to the variables defined in the Properties block.width: the metal width (in meters)

    2. length: the length of the microstrip line (in meters)

  1. eps_r: the permittivity of the dielectric

  2. height_b: the dielectric height between grounds (in meters)

  3. height_c: height to the ceiling (in meters)

  4. loss_tan: the loss tangent of the material

  5. cu_thickness: thickness of the copper (in meters)

  6. cu_sigma: the conductivity of the metal (Siemens per meter)

  7. offset_s: the offset of the stripline from true center (in meters)

  8. pcb_layer: the layer on which the artwork will be generated

scurve

    1. This is a curved low loss stripline. In TinyCAD many of these values are set equal to the variables defined in the Properties block.radius: the radius of the curved line (in meters)

    2. angle: the length of the curve (in degrees) [for PADS Layout output, keep under 90-degrees]

  1. eps_r: the permittivity of the dielectric

  2. height_b: the dielectric height between grounds (in meters)

  3. height_c: height to the ceiling (in meters)

  4. loss_tan: the loss tangent of the material

  5. cu_thickness: thickness of the copper (in meters)

  6. cu_sigma: the conductivity of the metal (Siemens per meter)

  7. offset_s: the offset of the stripline from true center (in meters)

  8. pcb_layer: the layer on which the artwork will be generated

slintaper

    1. This is an approximation to a short tapered stripline, to lessen parasitic capacitances in a sharp impedance transition. In TinyCAD many of these values are set equal to the variables defined in the Properties block.W1: the metal width for port 1 (in meters)

    2. W2: the metal width for port 2 (in meters)

    3. length: the length of the microstrip line (in meters)

  1. eps_r: the permittivity of the dielectric

  2. height_b: the dielectric height between grounds (in meters)

  3. height_c: height to the ceiling (in meters)

  4. loss_tan: the loss tangent of the material

  5. cu_thickness: thickness of the copper (in meters)

  6. cu_sigma: the conductivity of the metal (Siemens per meter)

  7. offset_s: the offset of the stripline from true center (in meters)

  8. pcb_layer: the layer on which the artwork will be generated

stee

    1. This is a lossless stripline tee-junction. In TinyCAD many of these values are set equal to the variables defined in the Properties block.width_a: Port 1 and Port 2 width (in meters)

    2. width_2: Port 3 width, crosses with ports 1 and 2 (in meters)

  1. eps_r: the permittivity of the dielectric

  2. height_b: the dielectric height (in meters)

  3. thickness: thickness of the copper (in meters)

  4. offset_s: the offset of the stripline from true center (in meters)

  5. pcb_layer: the layer on which the artwork will be generated

scross

    1. This is an approximation for the lossless stripline cross. In TinyCAD many of these values are set equal to the variables defined in the Properties block.W1: width of ports 1 and 2 (in meters)

  1. W2: width of ports 3 and 4 (in meters)

  2. eps_r: the permittivity of the dielectric

  3. height_d: the dielectric height (in meters)

  4. pcb_layer: the layer on which the artwork will be generated

smorcoupled

This is a a coupled pair of lines that uses a 2D finite difference code (Method of Relaxation). If you are not familiar with 2DFD codes, you might want to avoid using this part. The grid is defined below, please keep in mind the walls, floor, and ceiling are considered "ground", so don't let the strips get too close to the boundaries. In TinyCAD many of these values are set equal to the variables defined in the Properties block.

    1. X1,Y1: bottom left corner of strip 1 (in meters)

    2. Width1: width of strip 1 (in meters)

    3. Thickness1: thickness of strip 1 (in meters)

  1. X2, Y2: bottom left corner of strip 2 (in meters)

  2. Width2: width of strip 2 (in meters)

    1. Thickness2: thickness of strip 2 (in meters)

  3. eps_r: the permittivity of the dielectric

  4. DYmin: the bottom of the dielectric, zero is the bottom of the grid (in meters)

  5. DYMax: the top of the dielectric, MaxY is the top of the grid (in meters)

  6. MaxX, MaxY: size of the simulation space

As with all differential models in PrimCalc, the impedance is defined differentially: Z0 is half the total impedance.

Copyright 2010, Gregory Kiesel