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【正文】 n Impedance 233 HFSS Boundary Descriptions: PML 由物體表面創(chuàng)建PML層 234 HFSS Boundary Descriptions: PML 235 HFSS Boundary Descriptions: PML 由三維物體創(chuàng)建PML層 236 HFSS Boundary Descriptions: PML 237 HFSS中的缺省邊界條件 238 默認(rèn)邊界條件 239 HFSS Source List( HFSS中的激勵(lì)源類型) 240 HFSS中的端口類型 241 Wave Port 表面 242 243 Wave Ports 位置 244 端口延伸和高次模問題 245 高次模傳輸問題 246 HFSS Ports: Spacing from Discontinuities ? Structure interior to the modeled volume may create and reflect nonpropagating modes ? These modes attenuate rapidly as they travel along the transmission line ? If the port is spaced too close to a discontinuity causing this effect, the improper solution will be obtained ? A port is a ?matched load? as seen from the model, but only for the modes it has been designed to handle ? Therefore, unsolved modes incident upon it are reflected back into the model, altering the field solution ? Remedy: Space your port far enough from discontinuities to prevent nonpropagating mode incidence ? Spacing should be on order of port size, not wavelength dependent Port Extension 247 HFSS Ports: SingleDirection Propagation ? Wave ports must be defined so that only one face can radiate energy into the model ? Lumped Ports have no such restriction ? Position Wave Ports on the exterior of the geometry (one face on background) or provide a port cap. ? Cap should be the same dimensions as the port aperture, be a 3D solid object, and be defined as a perfect conductor in the Material Setup module Port on Exterior Face of Model Port Inside Modeled Air Volume。21 邊界與端口設(shè)置 電子科技大學(xué) 賈寶富 22 Boundary/Excitations Overview ? Why are They Critical? ? For most practical problems, the solution to Maxwell?s equations requires arigorous matrix approach such as the Finite Element Method (FEM) whichis used by Ansoft HFSS. ? The wave equation solved by Ansoft HFSS is derived from thedifferential form of Maxwell?s equations. ? For these expressions to be valid, it is assumed that the field vectors are: ? singlevalued, ? bounded, and have a ? continuous distribution (along with their derivatives) ? Along boundaries of media or at sources, ? Field vectors are discontinuous ? Derivatives of the field vectors have no meaning ? Boundary Conditions define the field behavior across discontinuous boundaries 23 Boundary/Excitations Overview 24 Boundary/Excitations Overview 25 HFSS Boundary List ? Perfect E and Perfect H/Natural ? Ideal Electrically or Magically Conducting Boundaries ? ?Natural? denotes Perfect E ?cancellation? behavior ? Finite Conductivity ? Lossy Electrically Conducting Boundary, with userprovided conductivity and permeability ? Impedance ? Used for simulating ?thin film resistor? materials, with userprovided resistance and reactance in ??/Square ? Layered Impedance ? Screen Impedance ? Radiation ? An ?absorbing boundary condition,? used at the periphery of a project in which radiation is expected such as an antenna structure ? Symmetry ? A boundary which enables modeling of only a subsection of a structure in which field symmetry behavior is assured. ? “Perfect E” and “Perfect H” subcategories ? Lumped RLC ? Master and Slave ? ?Linked? boundary conditions for unitcell studies of infinitely replicating geometry (. a slow wave circuit an antenna array) ? PML (Perfect Match Layer) 26 邊界條件定義的覆蓋 27 HFSS Boundary Descriptions: Perfect E and Perfect H/Natural ? Parameters: None ? Perfect E is a perfect electrical conductor* ? Forces Efield perpendicular to the surface ? Represent metal surfaces, ground planes, ideal cavity walls, etc. ? Perfect H is a perfect magic conductor ? Forces Hfield perpendicular to surface, Efield tangential ? Does not exist in the real world, but represents useful boundary constraint for modeling ? Natural denotes effect of Perfect H applied on top of some other (. Perfect E) boundary ? ?Deletes? the Perfect E condition, permitting but not requiring tangential electrical fields. ? Opens a ?hole? in the Perfect E plane Perfect E Boundary* Perfect H Boundary ‘ Natural? Boundary larperpendicuE? continuousE? parallelE?*NOTE: When you define a solid object as a ?perf_conductor? in the Material Setup, a Perfect E boundary condition is applied to its exterior surfaces!! 28 Perfect E應(yīng)用實(shí)例 29 Perfect H應(yīng)用實(shí)例 210 Perfect H for 2D Aperture (I) ? Monopole Over a Ground plane Perfect H Surface Interior to the Problem Space Behaves Like an Infinitely Thin 2D Aperture Perfect H 211 Perfect H for 2D Aperture (II) ? Small Hole Can be “Cut” in infinitely Thin Septum Between the Upper and Lower Guide Using a Perfect H Surface at the Hole Perfect H 212 Finite Conductivity ? 趨膚深度 1=f? ? ? ?213 DC versus AC 214 HFSS Boundary Descriptions: Finite Conductivity ? Parameters: Conductivity and Permeability ? Finite Conductivity is a lossy electrical conductor ? Efield forced perpendicular, as with Perfect E ? However, surface impedance takes into account resistive and reactive surface losses ? User inputs conductivity (in siemens/meter) and relative permeability (unit
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