# The waveguide adapter consists of a rectangular part smoothly transcending into an elliptical part as seen in Figure 1.

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1 Waveguide Adapter Introduction This is a model of an adapter for microwave propagation in the transition between a rectangular and an elliptical waveguide. Such waveguide adapters are designed to keep energy losses due to reflections at a minimum for the operating frequencies. To investigate the characteristics of the adapter, the simulation includes a wave traveling from a rectangular waveguide through the adapter and into an elliptical waveguide. The S-parameters are calculated as functions of the frequency. The involved frequencies are all in the single-mode range of the waveguide, that is, the frequency range where only one mode is propagating in the waveguide. Model Definition The waveguide adapter consists of a rectangular part smoothly transcending into an elliptical part as seen in Figure 1. Figure 1: The geometry of the waveguide adapter. The walls of manufactured waveguides are typically plated with a good conductor such as silver. The model approximates the walls by perfect conductors. This is represented by the boundary condition n E = 0. WAVEGUIDE ADAPTER 1

2 The rectangular port is excited by a transverse electric (TE) wave, which is a wave that has no electric field component in the direction of propagation. This is what an incoming wave would look like after traveling through a straight rectangular waveguide with the same cross section as the rectangular part of the adapter. The excitation frequencies are selected so that the TE 10 mode is the only propagating mode through the rectangular waveguide. The cutoff frequencies for the different modes can be achieved analytically from the relation c ( ν c ) mn 2 - m ā - 2 n = + - b 2 where m and n are the mode numbers, and c is the speed of light. For the TE 10 mode, m = 1 and n = 0. With the dimensions of the rectangular cross section (a = cm and b = cm), the TE 10 mode is the only propagating mode for frequencies between 6.6 GHz and 14.7 GHz. Although the shape of the TE 10 mode is known analytically, this model lets you compute it using a numerical port. This technique is very general, in that it allows the port boundary to have any shape. The solved equation is ( n 2 H n ) n 2 β ( k 0 )H n = 0 Here H n is the component of the magnetic field perpendicular to the boundary, n the refractive index, β the propagation constant in the direction perpendicular to the boundary, and k 0 the free space wave number. The eigenvalues are λ = jβ. The same equation is solved separately at the elliptical end of the waveguide. The elliptical port is passive, but the eigenmode is still used in the boundary condition of the 3D propagating wave simulation. The dimensions of the elliptical end of the waveguide are such that the frequency range for the lowest propagating mode overlaps that of the rectangular port. With the stipulate excitation at the rectangular port and the numerically established mode shapes as boundary conditions, the following equation is solved for the electric field vector E inside the waveguide adapter: 1 2 ( µ r E) k jσ 0 εr - E = 0 ωε 0 where µ r denotes the relative permeability, j the imaginary unit, σ the conductivity, ω the angular frequency, ε r the relative permittivity, and ε 0 the permittivity of free space. The model uses the following material properties for free space: σ = 0 and µ r = ε r = 1. 2 WAVEGUIDE ADAPTER

3 Results Figure 2 shows a single-mode wave propagating through the waveguide. Figure 2: The x component of the propagating wave inside the waveguide adapter at the frequency 10 GHz. Naming the rectangular port Port 1 and the elliptical port Port 2, the S-parameters describing the reflection and transmission of the wave are defined as follows: * (( E c E 1 ) E 1 ) da 1 Port 1 S 11 = - ( E 1 E 1 ) da 1 Port 1 ( E c E 2 ) da 2 Port 2 S 21 = - * ( E 2 E 2 ) da 2 Port 2 Here E c is the calculated total field. E 1 is the analytical field for the port excitation, and E 2 is the eigenmode calculated from the boundary mode analysis and normalized * WAVEGUIDE ADAPTER 3

4 with respect to the outgoing power flow. Figure 3 and Figure 4 show the S 11 and S 21 parameters as functions of the frequency. Figure 3: The S 11 parameter (in db) as a function of the frequency. This parameter describes the reflections when the waveguide adapter is excited at the rectangular port. 4 WAVEGUIDE ADAPTER

5 Figure 4: The S 21 parameter (in db) as a function of the frequency. This parameter is a measure of the part of the wave that is transmitted through the elliptical port when the waveguide adapter is excited at the rectangular port. Model Library path: RF_Module/RF_and_Microwave_Engineering/ waveguide_adapter Modeling Instructions MODEL WIZARD Start by selecting a boundary mode analysis. 1 Go to the Model Wizard window. 2 Click Next. 3 In the Physics interfaces tree, select Radio Frequency>Electromagnetic Waves (rf). 4 Click Next. 5 Click Finish. WAVEGUIDE ADAPTER 5

6 6 In the Model Builder window, right-click the top node and select Add Study. STUDY 1 1 In the Model Builder window, right-click Study 1 and select Add Boundary Mode Analysis. 2 In the Model Builder window, select Boundary Mode Analysis 1. 3 Go to the Settings window. 4 Locate the Study Settings section. In the Mode analysis frequency edit field, type 7[GHz]. The exact value of this frequency is not important. What matters is that it should be above the cutoff frequency for the fundamental mode, but below that for the next mode. This will ensure that the boundary mode analysis finds the fundamental mode. Add another boundary mode analysis, for the second port. 5 In the Model Builder window, right-click Study 1 and select Add Boundary Mode Analysis. 6 Go to the Settings window. 7 Locate the Study Settings section. In the Port name edit field, type 2. 8 In the Mode analysis frequency edit field, type 7[GHz]. Finally, add the 3D equation for the propagating wave in the waveguide. 9 In the Model Builder window, right-click Study 1 and select Add Frequency Domain. Proceed to import the geometry. GEOMETRY 1 In the Model Builder window, right-click Geometry 1 and select Add Import. Import 1 1 Go to the Settings window. 2 Browse to the model s Model Library folder and select the file waveguide_adapter.mphbin. 3 Locate the Import section. Click the Browse button. 4 Click the Import button. MATERIALS 1 In the Model Builder window, right-click Materials and select Open Material Browser. 6 WAVEGUIDE ADAPTER

7 2 Go to the Material Browser window. 3 In the Material selection tree, select Common Materials>Air. 4 Right-click and choose Add Material to Model from the menu. Air 1 In the Model Builder window, select Air. 2 Go to the Settings window. 3 Locate the Geometric Scope section. From the Selection list, select All domains. PHYSICS Electromagnetic Waves 1 In the Model Builder window, right-click Electromagnetic Waves and select Add Port. 2 Go to the Settings window. 3 Locate the Port Properties section. From the Type of port list, select Numeric. 4 From the Wave excitation at this port list, select On. 5 Select Boundary 13 only. This is where the wave will enter the adapter, through the port with a rectangular cross-section. 6 In the Model Builder window, right-click Electromagnetic Waves and select Add Port. 7 Go to the Settings window. 8 Locate the Port Properties section. From the Type of port list, select Numeric. 9 In the Port name edit field, type Select Boundary 6 only. This is the exit port, the one with an elliptical cross-section. MESH 1 1 In the Model Builder window, right-click Mesh 1 and select Add Free Tetrahedral. 2 In the Model Builder window, select Size. 3 Go to the Settings window. 4 Click to expand the Custom Element Size section. 5 In the Maximum element size edit field, type In the Model Builder window, select Mesh 1. 7 Go to the Settings window. 8 Click the Build All button. WAVEGUIDE ADAPTER 7

8 STUDY 1 In the Model Builder window, right-click Study 1 and select Generate Solver Sequence. Solver Sequence 1 You will now set up the solver to find the boundary modes and use them when computing the field distribution over a range of frequencies. 1 In the Model Builder window, select Eigenvalue 1. 2 Go to the Settings window. 3 Locate the General section. In the Desired number of eigenvalues edit field, type 1. 4 From the Eigenvalue transformation list, select Propagation constant. 5 Find the Search for eigenvalues around subsection. In the Value edit field, type 50. This value should be in the vicinity of the value that you expect the fundamental mode to have. If you do not know this in advance, you can experiment with some different values or estimate one from analytical formulas valid for cross-sections resembling yours. 6 In the Model Builder window, select Eigenvalue 2. 7 Go to the Settings window. 8 Locate the General section. In the Desired number of eigenvalues edit field, type 1. 9 From the Eigenvalue transformation list, select Propagation constant. 10 Find the Search for eigenvalues around subsection. In the Value edit field, type In the Model Builder window, select Parametric Go to the Settings window. 13 Locate the General section. In the Parameter values edit field, type range(6.6e9,3.4e9/49,1.0e10). 14 In the Model Builder window, right-click Solver Sequence 1 and select Compute. RESULTS Plot Group 3D 1 The default plot shows the norm of the electric field on the surface of the waveguide. You can also plot the fields inside. Plot Group 3D 2 1 In the Model Builder window, select Slice 1. 2 Go to the Settings window. 3 In the upper-right corner of the Expression section, click Replace Expression. 8 WAVEGUIDE ADAPTER

9 4 From the menu, choose Electromagnetic Waves>Electric field>electric field, x component (Ex). 5 Locate the Coloring and Style section. From the Color table list, select Thermal. 6 Locate the Plane Data section. In the Planes edit field, type 1. 7 Click the Plot button. The plot now shows the x-component of the electric field at the highest frequency, 10 GHz. If you would like to see the field for other frequencies, you can select them by clicking on Plot Group 3D 2. At this time, proceed to see the S-parameters as functions of the frequency. In the Model Builder window, right-click Results and select Add Plot Group 1D. Plot Group 1D 3 1 In the Model Builder window, right-click Plot Group 1D 3 and select Add Global. 2 Go to the Settings window. 3 In the upper-right corner of the Expressions section, click Replace Expression. 4 From the menu, choose Electromagnetic Waves>S-parameter (S11dB_rf). 5 Click the Plot button. 6 In the upper-right corner of the Expressions section, click Replace Expression. 7 From the menu, choose Electromagnetic Waves>S-parameter (S21dB_rf). 8 Click the Plot button. WAVEGUIDE ADAPTER 9

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