RF MODULE

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4 Select Point 4, and choose Electric field, phi component from the Predefined quantities list. 5 Click the New button again and repeat the steps above to define a point probe plot named Ein for Point 2. 6 Select the Plot all plots in the same axis check box. Click OK. Proceed to set up the solver. 1 From the Solve menu, choose Solver Parameters. 2 In the Times edit field type 0 6.1e-14 9e-14 1.2e-13. 3 On the Time Stepping page, select Manual from the Time steps taken by solver list. Set the Time step to 2e-16. 4 If you do not intend to perform an FFT analysis or want to use a presaved data file for this purpose, skip directly to Step 17; otherwise continue with the next step. 5 Change the Times to store in output to Time steps from solver. 6 Click Apply. Next, set up and solve a single-step parametric sweep to generate a log file. 7 From the Solve menu, choose Parametric Sweep. 8 In the Parameter names edit field, enter a dummy name, for example, dummyparam. 9 In the Parameter values edit field, enter a single value, for example, 0. 10 In the Global variables to evaluate edit field, type Eout. 11 In the Log file name edit field, type second_harmonic_generation_outdata.txt to save the log in the current directory or click Browse and use the Log File dialog box to save the file in a suitable directory, preferably one on you MATLAB path. 12 Click the Solve button in the Parametric Sweep dialog box. 13 When the solver has finished, click OK to close the Parametric Sweep dialog box. 14 From the File menu, select Reset Model. In the dialog box that appears, click OK to confirm. 15 Return to the Solver Parameters dialog box. 16 On the Time Stepping page, set the Times to store in output to Specified times. 17 Click OK to close the Solver Parameters dialog box. 18 Click the Solve button on the Main toolbar. POSTPROCESSING AND VISUALIZATION 1 Select Plot Parameters from the Postprocessing menu. 304 | CHAPTER 4: OPTICS AND PHOTONICS MODELS
2 On the General page, make sure that the Surface, Boundary, and Geometry edges check boxes are selected. 3 From the Solution at time list, select 6.1e-14. 4 On the Surface page, type Ephi_rfwe in the Expression edit field. 5 Click the Height Data tab, select the Height data check box, and type Ephi_rfwe in the Expression edit field. 6 On the Boundary page, type E_lim in the Expression edit field. 7 Click the Height Data tab, select the Height data check box, and type E_lim in the Expression edit field. 8 Click the Uniform color option button. 9 Click the Color button and select white from the palette in the dialog box that appears. Click OK to close the dialog box. 10 Click Apply to get the plot in Figure 4-11. 11 On the General page, select 9e-14 from the Solution at time list. Click OK. You should now see the plot in Figure 4-12. FFT ANALYSIS USING MATLAB If you have MATLAB, you can go on to compute and plot the Fourier transform of the electric field at the output boundary that you stored in the parametric sweep log file. This data is also provided in the text file second_harmonic_generation_outdata.txt, located in the model’s Model Library folder. Now switch to the MATLAB workspace. 1 If you stored the data file in a directory that is not on your MATLAB path, use the command cd to navigate to that directory. Open the file in a text editor and remove the initial header before saving it again. 2 At the MATLAB prompt, enter the following commands to fetch the output field data from the file: S = load('second_harmonic_generation_data.txt','-ascii'); xdata = S(:,2); ydata = S(:,3); (The first column in the data text file contains the values for the dummy parameter used in the parametric sweep and can thus be discarded.) SECOND HARMONIC GENERATION OF A GAUSSIAN BEAM | 305
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COMSOL Multiphysics RF MODULE V ERS
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CONTENTS Chapter 1: Introduction Mo
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Results and Discussion. . . . . . .
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Chapter 4: Optics and Photonics Mod
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1 Introduction The RF Module Model
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highlights. The categories here inc
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TABLE 1-1: RF MODULE MODEL LIBRARY
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2 Tutorial Models This chapter cont
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Results and Discussion Figure 2-1 s
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4 Draw a square with corners at (
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COMPUTING THE SOLUTION Click the So
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Results and Discussion The dipole a
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PHYSICS SETTINGS Variables 1 Choose
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5 Click OK to close the dialog box
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Model Library path: RF_Module/Tutor
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4 From the Solve menu, open the Sol
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them from the eigenvalues. The appl
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5 On the Port page, set the values
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5 On the Port page, enter 36.4 in t
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Waveguide Optimization Introduction
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Results and Discussion Figure 2-3 s
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Modeling Using the Graphical User I
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3 Select Boundary 7 and set the Con
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POSTPROCESSING AND VISUALIZATION Fo
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The solution takes a few minutes to
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Night side Earth surface Ionosphere
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Results and Discussion The model pr
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4 Select both spheres and click the
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RF and Microwave Models In this cha
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measure of the transmittance and re
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y 1 cm is at about 7.5 GHz. At the
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By feeding the circulator at a diff
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Importing the Geometry from a Binar
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MESH GENERATION This model uses the
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It is more instructive to look at t
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Note: When displaying S-Parameter v
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Monoconical RF Antenna Introduction
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50 Ω, to obtain maximum transmiss
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Figure 3-7 shows the antenna radiat
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2 Select the RF Module>Electromagne
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13 Zoom in around (0, 0) using the
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4 In the Contour levels area, click
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2 Clear the Keep current plot check
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6 Click the Solve button on the Mai
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Results and Discussion The figure b
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PHYSICS SETTINGS Point Settings Def
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2 In the x-axis area, select the Ex
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Because the impedance is inversely
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4 From the Space dimension list, se
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2 Select Boundaries 1, 2, 4, and 6.
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4 On the Pointwise Constraints page
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12 Click the Solve button on the Ma
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Module. The electromagnetic cavity
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EIGENFREQUENCY VS. TEMPERATURE By r
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GEOMETRY MODELING 1 Go to the Draw
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3 Set dx, dy, and dz to u, v, and w
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20 Select the Solve using solver se
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Computing the Solution Using a Para
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8 Click Solve. 9 When the parametri
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H-Bend Waveguide with S-parameters
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Model Library path: RF_Module/RF_an
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1 From the Postprocessing menu, cho
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The rectangular port is excited by
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Figure 3-16 shows a single-mode wav
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Figure 3-18: The S 21 parameter (in
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PHYSICS SETTINGS First set up the b
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FREEZING THE BOUNDARY MODE ANALYSIS
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Microwave Cancer Therapy Introducti
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The model takes advantage of the pr
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DOMAIN AND BOUNDARY EQUATIONS—HEA
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Figure 3-23: The computed microwave
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solutions for both the electromagne
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4 Select Subdomain 1, then enter th
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1 Click the Plot Parameters button
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sar_in_human_head_interp.txt. That
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The bioheat equation produces a sim
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3 Click OK. 4 From the Options menu
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17 In the Work-Plane Settings dialo
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SETTINGS SUBDOMAIN 19 epsilonr_brai
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4 Click the Init tab and type 0 in
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POSTPROCESSING AND VISUALIZATION 1
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The walls of the oven and the waveg
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Figure 3-29: Temperature in the cen
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3 Click the block symbol again and
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2 At the waveguide end, Boundary 23
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4 Click OK to generate the plot bel
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Because the filter cutoff should be
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the force is applied. Figure 3-32 d
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6 Then the ECAD Import Options dial
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PHYSICS SETTINGS Subdomain Settings
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solver takes more steps than it sto
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3 Select Subdomain 1 and clear the
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Balanced Patch Antenna for 6 GHz In
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k0 = ω ε0 µ 0 All metallic objec
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divided by the input power. In Figu
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Reference 1. E. Recht and S. Shiran
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10 Select the objects SQ2, CO1, and
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43 Specify two spheres with the fol
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inputs are feeding the antenna, lik
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the width of the PML is equal to λ
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a toggle button that shifts between
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5 Select Coarse solver from the tre
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maxE = max(EdB); minE = min(EdB); E
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exterior of the PML that shows a ve
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13 Choose Extrude from the Draw men
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2 Click the Settings button. 3 In t
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Sea Bed Logging Introduction The Se
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Figure 3-39: Electric field magnitu
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PHYSICS SETTINGS Scalar Variables 1
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5 Click the General tab. From the P
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Optics and Photonics Models In this
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Model Definition The model is built
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Model Library path: RF_Module/Optic
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PHYSICS SETTINGS Scalar Variables S
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POSTPROCESSING AND VISUALIZATION By
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Model Definition The geometry is a
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2 In the list of application modes,
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Because the refractive index of GaA
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5 Click OK twice to see the followi
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Bandgap Analysis of a Photonic Crys
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a 2 a 3 × b1 = 2π----------------
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The five lowest bands for the (1, 1
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Modeling Using the Graphical User I
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Subdomain Settings 1 Open the Subdo
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3 Click the Parametric tab. Select
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3 Click OK to see the following plo
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Page 263 and 264: Model Definition The mode analysis
Page 265 and 266: 2 Select the RF Module>Perpendicula
Page 267 and 268: 4 On the Contour page, give Magneti
Page 269 and 270: includes only two independent param
Page 271 and 272: OPTIONS AND SETTINGS 1 Open the Con
Page 273 and 274: The problem becomes well-posed by a
Page 275 and 276: POSTPROCESSING AND VISUALIZATION Th
Page 277 and 278: 7 Click OK. 8 From the Postprocessi
Page 279 and 280: the computed propagation constants
Page 281 and 282: 3 The default eigenmode is the one
Page 283 and 284: Compare these ideal values of the p
Page 285 and 286: Stress-Optical Effects with General
Page 287 and 288: The PDE solved is Navier’s equati
Page 289 and 290: and εx ∂u = ∂x εy ∂v = ∂y
Page 291 and 292: Model Library path: RF_Module/Optic
Page 293 and 294: NAME EXPRESSION DESCRIPTION B2 0.65
Page 295 and 296: 2 In the Subdomain Expressions dial
Page 297 and 298: 4 Initialize the mesh in this geome
Page 299 and 300: Note: This model includes an extens
Page 301 and 302: 3 Enter 1.46 in the text field Sear
Page 303 and 304: In these expressions, w 0 is the mi
Page 305 and 306: After 90 fs the pulse has reached t
Page 307 and 308: 4 Select the RF Module>In-Plane Wav
Page 309 and 310: Boundary Conditions 1 From the Phys
Page 311: 6 Click the Remesh button; when the
Page 315 and 316: Propagation of a 3D Gaussian Beam L
Page 317 and 318: Figure 4-15: After 20 fs the pulse
Page 319 and 320: 7 Click the Delete Interior Boundar
Page 321 and 322: Boundary Conditions 1 From the Phys
Page 323 and 324: 5 From the Options menu, select Sup
Page 325 and 326: INDEX 3D electromagnetic waves mode
Page 327 and 328: efractive index 222, 254 resistance
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RF MODULE

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