RF MODULE

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vi | CONTENTS Convergence Analysis . . . . . . . . . . . . . . . . . . . . 273 Stress-Optical Effects with Generalized Plane Strain 277 Introduction . . . . . . . . . . . . . . . . . . . . . . . 277 Generalized Plane Strain . . . . . . . . . . . . . . . . . . . 277 Modeling Using the Graphical User Interface—Plane Strain Analysis . . 283 Modeling Using the Graphical User Interface—Optical Mode Analysis . . 291 Second Harmonic Generation of a Gaussian Beam 294 Introduction . . . . . . . . . . . . . . . . . . . . . . . 294 Model Definition . . . . . . . . . . . . . . . . . . . . . . 294 Results and Discussion. . . . . . . . . . . . . . . . . . . . 296 Reference . . . . . . . . . . . . . . . . . . . . . . . . 298 Modeling Using the Graphical User Interface . . . . . . . . . . . 298 Propagation of a 3D Gaussian Beam Laser Pulse 307 Introduction . . . . . . . . . . . . . . . . . . . . . . . 307 Model Definition . . . . . . . . . . . . . . . . . . . . . . 307 Results and Discussion. . . . . . . . . . . . . . . . . . . . 308 Modeling Using the Graphical User Interface . . . . . . . . . . . 309 INDEX 317
1 Introduction The <strong>RF</strong> Module Model Library consists of a set of models from various areas of electromagnetic wave simulations. Their purpose is to assist you in learning, by example, how to model sophisticated electromagnetic components, systems, and effects. Through them, you can tap the expertise of the top researchers in the field, examining how they approach some of the most difficult modeling problems you might encounter. You can thus get a feel for the power that COMSOL Multiphysics offers as a modeling tool. In addition to serving as a reference, the models can also give you a big head start if you are developing a model of a similar nature. We have divided these models into three groups: optics and photonics, <strong>RF</strong> and microwave engineering, and tutorial models. The models also illustrate the use of the various electromagnetics-specific application modes from which we built them. These specialized modes are unavailable in the base COMSOL Multiphysics package, and they come with their own graphical user interfaces that make it quick and easy to access their power. You can even modify them for custom requirements. COMSOL Multiphysics itself is very powerful and, with sufficient expertise in a given field, you certainly could develop these modes by yourself—but why spend the hundreds or thousands of hours that would be necessary when our team of experts has already done the work for you? 1
Page 1 and 2: COMSOL Multiphysics RF MODULE V ERS
Page 3 and 4: CONTENTS Chapter 1: Introduction Mo
Page 5 and 6: Results and Discussion. . . . . . .
Page 7: Chapter 4: Optics and Photonics Mod
Page 11 and 12: highlights. The categories here inc
Page 13 and 14: TABLE 1-1: RF MODULE MODEL LIBRARY
Page 15 and 16: 2 Tutorial Models This chapter cont
Page 17 and 18: Results and Discussion Figure 2-1 s
Page 19 and 20: 4 Draw a square with corners at (
Page 21 and 22: COMPUTING THE SOLUTION Click the So
Page 23 and 24: Results and Discussion The dipole a
Page 25 and 26: PHYSICS SETTINGS Variables 1 Choose
Page 27 and 28: 5 Click OK to close the dialog box
Page 29 and 30: Model Library path: RF_Module/Tutor
Page 31 and 32: 4 From the Solve menu, open the Sol
Page 33 and 34: them from the eigenvalues. The appl
Page 35 and 36: 5 On the Port page, set the values
Page 37 and 38: 5 On the Port page, enter 36.4 in t
Page 39 and 40: Waveguide Optimization Introduction
Page 41 and 42: Results and Discussion Figure 2-3 s
Page 43 and 44: Modeling Using the Graphical User I
Page 45 and 46: 3 Select Boundary 7 and set the Con
Page 47 and 48: POSTPROCESSING AND VISUALIZATION Fo
Page 49 and 50: The solution takes a few minutes to
Page 51 and 52: Night side Earth surface Ionosphere
Page 53 and 54: Results and Discussion The model pr
Page 55 and 56: 4 Select both spheres and click the
Page 57 and 58: 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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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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