# Coaxial Lumped Port

A Coaxial Lumped Port represents a coaxial-style lumped port with concentric inner and outer conductors.

This object corresponds to tidy3d.rf.CoaxialLumpedPort (opens new window).

# Name

name: Unique name for the port.

  • Required field

# Geometry

Specification of the coaxial lumped port geometry.

normal_axis: Axis normal to the concentric coaxial circles.

  • Options: 0/1/2, corresponding to the x-, y-, and z-axis
  • Required field

center: Center of the coaxial port in x, y, and z-directions.

  • Type: floating-point number
  • Unit: m, mm (default unit), um
  • Default: (0, 0, 0)

outer_diameter: Diameter of the outer coaxial circle.

  • Type: float number
  • Unit: m, mm (default unit), um
  • Constraint: greater than 0
  • Required field

inner_diameter: Diameter of the inner coaxial circle.

  • Type: float number
  • Unit: m, mm (default unit), um
  • Constraint: greater than 0
  • Required field

Coaxial lumped port geometry

NOTE

The inner diameter should be smaller than the outer diameter. The normal axis defines the plane of the coaxial port: for example, normal_axis = 2 places the coaxial circles in the x-y plane.

# Settings

# Direction

direction: Direction of the signal travelling in the transmission line.

  • Options: +/-
  • Required field

This direction is used to determine the path integral orientation for computing conduction current.

# Impedance

Reference port impedance used for scattering parameter computation.

real: Real part of the reference impedance.

  • Type: float number
  • Unit: Ω\Omega
  • Default: 50

imag: Imaginary part of the reference impedance.

  • Type: float number
  • Unit: Ω\Omega
  • Default: 0

# Advanced

# Mesh

num_grid_cells: Number of mesh grid cells associated with the port along each direction. These cells are added through automatic mesh refinement. A value of None turns off automatic mesh refinement.

  • Type: integer
  • Constraint: greater than 0
  • Default: 3

enable_snapping_points: Toggle whether snapping points are automatically generated at key geometric features of the coaxial lumped port.

  • Options:
    • True: Generate snapping points for more accurate modeling.
    • False: Do not generate snapping points.
  • Default: True

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