RF MODULE

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PHYSICS SETTINGS 1 Go to geometry Geom1 by clicking the Geom1 tab. 2 From the Options menu, choose Expressions>Scalar Expressions. 3 In the Scalar Expressions dialog box, define the following variables with names, expressions, and descriptions (optional): NAME VALUE DESCRIPTION w w0*sqrt(1+(z/z0)^2) Analytical waist function along z eta atan(z/z0) Analytical angle along z R z*(1+(z0/z)^2) Analytical radius along z r sqrt(x^2+y^2) Radial coordinate c0 1/sqrt(epsilon0_rfw*mu0_rfw) Speed of light omega0 2*pi*c0/lambda0 Angular frequency 4 Click OK. 5 From the Options menu, choose Expressions>Boundary Expressions. 6 In the Boundary Expressions dialog box, define the following variables with names and expressions: SETTING BOUNDARY 3 ALL OTHER E_bnd w0/w*exp(-r^2/w_bnd^2)* cos(omega0*t-k0*z+eta_bnd-r^2*k0/(2*R_bnd)) E_pulse exp(-(t-t0)^2/dt^2) Because of the use of an integration coupling variable (w_bnd), COMSOL Multiphysics cannot determine the unit for E_bnd and warns for an inconsistent unit here and in the specification of the scattering boundary condition. You can disregard these warnings. 7 Click OK. 8 From the Options menu, select Integration Coupling Variable>Point Variables. 9 In the Point Integration Variables dialog box, define the following variables with names and expressions. Use Global destination for all variables. NAME POINT 1 ALL OTHERS w_bnd w eta_bnd eta R_bnd R 312 | CHAPTER 4: OPTICS AND PHOTONICS MODELS
Boundary Conditions 1 From the Physics menu, open the Boundary Settings dialog box and enter the settings according the following two tables (leave all fields not specified at their default values): SETTINGS BOUNDARY 3 BOUNDARY 4 Boundary condition Scattering boundary Scattering boundary E0,x E0*E_pulse*E_bnd 0 E0,y 0 0 E0,z 0 0 SETTING BOUNDARY 2 BOUNDARIES 1, 5 Boundary condition Perfect magnetic conductor Perfect electric conductor 2 Click OK. Subdomain Settings Use the default values for the subdomain settings. MESH GENERATION 1 From the Mesh menu, choose Free Mesh Parameters. 2 Click the Custom mesh size button and enter 1e-7 in the Maximum element size edit field. 3 Click the Advanced tab. 4 Enter 0.12 in the x-direction scale factor and y-direction scale factor edit fields. This keeps the small mesh size in the z direction but stretches the elements in the x and y directions. 5 Click the Remesh button, then click OK. COMPUTING THE SOLUTION 1 From the Solve menu, choose Solver Parameters. 2 In the Times edit field type range(0,5e-15,2e-14). 3 Click the Settings button. 4 In the dialog box that appears, select the Coarse solver item in the tree view. 5 Choose Off from the Check tolerances list and click OK. 6 Click the Time Stepping tab and select the Manual tuning of step size check box. Enter 1e-16 in the Initial time step and Maximum time step edit fields. PROPAGATION OF A 3D GAUSSIAN BEAM LASER PULSE | 313
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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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fem.appl{1}.prop.analysis = 'harmon
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Model Definition The mode analysis
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2 Select the RF Module>Perpendicula
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4 On the Contour page, give Magneti
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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
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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 and 312: 6 Click the Remesh button; when the
Page 313 and 314: 2 On the General page, make sure th
Page 315 and 316: Propagation of a 3D Gaussian Beam L
Page 317 and 318: Figure 4-15: After 20 fs the pulse
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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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