COAXRWG_TE10 is a behavioral model that represents an ideal matched transition between transmission lines featuring different characteristic impedances of coaxial and TE10 rectangular waveguide.

Name | Description | Unit Type | Default |
---|---|---|---|

Wa | Rectangular waveguide width | Length | 22.86 mm |

Wb | Rectangular waveguide height | Length | 10.16 mm |

Er | Relative dielectric constant filling the waveguide | 1 | |

Tand | Loss tangent of dielectric filling the waveguide | 0 | |

*Mur | Relative permeability filling the waveguide | 1 | |

*Tanm | Magnetic loss tangent filling the waveguide | 0 | |

*Sigma | Dielectric conductivity filling the waveguide | Siemens/m | 0 |

ZCoax | Coaxial characteristic impedance | Resistance | 50 ohm |

*ZCalc | Switch - selector of TE10 characteristic impedance definition ("Power-Voltage"/"Voltage-Current"/"Normalized") | Power-Voltage |

`* indicates a secondary parameter`

**Er, Tand, Mur, Tanm, Sigma.** The material properties
of the media filling the waveguide.

**Zcalc.** Allows you to select a definition of
characteristic impedance of the TE10 mode propagating in a rectangular waveguide with
dimensions Wa*Wb. Options include "Power-Voltage" ,"Voltage-Current", and "Normalized."
The default option is "Power-Voltage." This model uses the value of characteristic
impedance to denormalize the computed normalized y-matrix of modeled discontinuity. Note
that this selection must match the selection of the same parameter in theRWGIRIS_TE10, RWG_TEmn, and RWGT_TEmn elements used around
the same schematic.

The characteristic impedance definitions used [1] are:

f_{c} is the cutoff frequency for TEmn and f is the operational
frequency; and η is the wave impedance of open space filled with waveguide
dielectric.

Z_{Normalized}=1

COAXRWG_TE10 is implemented as an impedance transformer between two physical transmission lines. The transmission line at port 1 has the frequency-independent user-supplied characteristic impedance of a coaxial line; and the transmission line at port 2 has the frequency-dependent characteristic impedance of a rectangular waveguide with a propagating mode TE10.

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.

COAXRWG_TE10 provides an ideal match at port 1 if port 2 is terminated to an infinite waveguide. To provide this termination, use RWGT_TEmn (m=1, n=0) model. Alternatively, use PORT_TN port model that refer to a subcircuit containing a single RWGT_TEmn.

**Caution: **This model is developed to work in a
frequency range when only dominant TE10 propagates. It provides reasonable results out
of this range, but in this case user discretion is advised.

Normalized characteristic impedance implies that waveguide mode is propagating. This means: Never set ZCalc to "Normalized" if your operational frequency gets into below-cutoff region.

Keep in mind that the results depend on the selected definition of waveguide characteristic impedance.