RF MODULE

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property has different values among the selected subdomains. You fix this by reselecting the property to the specified value. SETTINGS SUBDOMAINS 1–9, 21– 29 4 Click OK. PHYSICS SETTINGS—BIOHEAT EQUATION From the Multiphysics menu, choose Bioheat Equation (htbh). Boundary Conditions The default boundary condition, thermal insulation, applies everywhere. Subdomain Settings 1 From the Physics menu, open the Subdomain Settings dialog box. 2 Select all subdomains except Subdomain 19, and clear the Active in this domain check box. 3 Then select Subdomain 19, and enter the following expressions. 152 | CHAPTER 3: <strong>RF</strong> AND MICROWAVE MODELS SUBDOMAINS 1–3, 7–12, 16–18, 21–23, 27–29 SUBDOMAINS 1, 3, 4, 6, 7, 9, 10, 12, 13, 15, 16, 18, 21, 23, 24, 26, 27, 29 Type of PML Cartesian Cartesian Cartesian Absorbing in x direction Selected As is As is Width in x direction 2*Sdx_guess_rfw As is As is Absorbing in y direction As is Selected As is Width in y direction As is 2*Sdy_guess_rfw As is Absorbing in z direction As is As is Selected Width in z direction As is As is 2*Sdz_guess_rfw PARAMETER EXPRESSION rho_blood ρb Cb ωb Tb Qext c_blood omega_head 0 Qav_rfw
4 Click the Init tab and type 0 in the dT(t 0 ) edit field. 5 Click OK. MESH GENERATION The steps to generate the mesh involve interactive meshing, where you use the standard free meshing for the head, patch, and surrounding air. For the PML regions, use swept meshing. This gives more control of the mesh resolution in the absorbing direction, which is crucial to get convergence with iterative solvers. 1 From the Mesh menu, choose Free Mesh Parameters. 2 Select Coarser from the Predefined mesh sizes list. 3 Click the Edge tab, select all edges of the patch facing the head (Edges 132–135, 137–138, 140–142, and 149). Enter 2e-3 in the Maximum element size edit field. 4 Click the Boundary tab, select Boundaries 73 and 78, enter 0.4 in the Mesh curvature factor edit field, and enter 0.01 in the Mesh curvature cutoff edit field. 5 Click the Subdomain tab, select Subdomain 19 and enter 0.015 in the Maximum element size edit field. 6 Select Subdomains 14, 19, and 20, and click the Mesh Selected button. 7 Click OK to close the Free Mesh Parameters dialog box. 8 Open the Swept Mesh Parameters dialog box from the Mesh menu. 9 Select the Subdomains 5, 11, 13, 15, 17, and 25. These are the PML regions with absorption in a single direction. 10 Select the Manual specification of element layers check box, and enter 4 in the Number of element layers edit field. 11 Click the Mesh Selected button. 12 Select the Subdomains 2, 4, 6, 8, 10, 12, 16, 18, 22, 24, 26, and 28. These are the PML regions with absorption in two directions. 13 Click the Mesh Selected button. This creates hex elements in the selected regions. 14 Click the Select Remaining button and then click the Mesh Selected button. This creates hex elements in the remaining PML regions. 15 Click OK to close the dialog box. The final mesh is a mix between tetrahedron elements and prism elements. ABSORBED RADIATION (SAR) IN THE HUMAN BRAIN | 153
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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
Page 109 and 110: GEOMETRY MODELING 1 Go to the Draw
Page 111 and 112: 3 Set dx, dy, and dz to u, v, and w
Page 113 and 114: 20 Select the Solve using solver se
Page 115 and 116: Computing the Solution Using a Para
Page 117 and 118: 8 Click Solve. 9 When the parametri
Page 119 and 120: H-Bend Waveguide with S-parameters
Page 121 and 122: Model Library path: RF_Module/RF_an
Page 123 and 124: 1 From the Postprocessing menu, cho
Page 125 and 126: The rectangular port is excited by
Page 127 and 128: Figure 3-16 shows a single-mode wav
Page 129 and 130: Figure 3-18: The S 21 parameter (in
Page 131 and 132: PHYSICS SETTINGS First set up the b
Page 133 and 134: FREEZING THE BOUNDARY MODE ANALYSIS
Page 135 and 136: 12 Click the Solve button on the Ma
Page 137 and 138: Microwave Cancer Therapy Introducti
Page 139 and 140: The model takes advantage of the pr
Page 141 and 142: DOMAIN AND BOUNDARY EQUATIONS—HEA
Page 143 and 144: Figure 3-23: The computed microwave
Page 145 and 146: solutions for both the electromagne
Page 147 and 148: 4 Select Subdomain 1, then enter th
Page 149 and 150: 1 Click the Plot Parameters button
Page 151 and 152: sar_in_human_head_interp.txt. That
Page 153 and 154: The bioheat equation produces a sim
Page 155 and 156: 3 Click OK. 4 From the Options menu
Page 157 and 158: 17 In the Work-Plane Settings dialo
Page 159: SETTINGS SUBDOMAIN 19 epsilonr_brai
Page 163 and 164: POSTPROCESSING AND VISUALIZATION 1
Page 165 and 166: The walls of the oven and the waveg
Page 167 and 168: Figure 3-29: Temperature in the cen
Page 169 and 170: 3 Click the block symbol again and
Page 171 and 172: 2 At the waveguide end, Boundary 23
Page 173 and 174: 4 Click OK to generate the plot bel
Page 175 and 176: 3 Click OK to generate the plot bel
Page 177 and 178: Because the filter cutoff should be
Page 179 and 180: the force is applied. Figure 3-32 d
Page 181 and 182: 6 Then the ECAD Import Options dial
Page 183 and 184: PHYSICS SETTINGS Subdomain Settings
Page 185 and 186: solver takes more steps than it sto
Page 187 and 188: 3 Select Subdomain 1 and clear the
Page 189 and 190: 13 Click the Solve button on the Ma
Page 191 and 192: Balanced Patch Antenna for 6 GHz In
Page 193 and 194: k0 = ω ε0 µ 0 All metallic objec
Page 195 and 196: divided by the input power. In Figu
Page 197 and 198: Reference 1. E. Recht and S. Shiran
Page 199 and 200: 10 Select the objects SQ2, CO1, and
Page 201 and 202: 43 Specify two spheres with the fol
Page 203 and 204: inputs are feeding the antenna, lik
Page 205 and 206: the width of the PML is equal to λ
Page 207 and 208: a toggle button that shifts between
Page 209 and 210: 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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4 Click OK to generate the plot bel
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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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includes only two independent param
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OPTIONS AND SETTINGS 1 Open the Con
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The problem becomes well-posed by a
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POSTPROCESSING AND VISUALIZATION Th
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7 Click OK. 8 From the Postprocessi
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the computed propagation constants
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3 The default eigenmode is the one
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Compare these ideal values of the p
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Stress-Optical Effects with General
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The PDE solved is Navier’s equati
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and εx ∂u = ∂x εy ∂v = ∂y
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Model Library path: RF_Module/Optic
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NAME EXPRESSION DESCRIPTION B2 0.65
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2 In the Subdomain Expressions dial
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4 Initialize the mesh in this geome
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Note: This model includes an extens
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3 Enter 1.46 in the text field Sear
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In these expressions, w 0 is the mi
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After 90 fs the pulse has reached t
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4 Select the RF Module>In-Plane Wav
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Boundary Conditions 1 From the Phys
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6 Click the Remesh button; when the
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2 On the General page, make sure th
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Propagation of a 3D Gaussian Beam L
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Figure 4-15: After 20 fs the pulse
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7 Click the Delete Interior Boundar
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Boundary Conditions 1 From the Phys
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5 From the Options menu, select Sup
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INDEX 3D electromagnetic waves mode
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efractive index 222, 254 resistance
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RF MODULE

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