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Tips: HFSS 中的三种辐射边界
Radiation Boundary
? Mimics continued propagation beyond boundary plane
– Absorption achieved via 2nd order radiation boundary
– Absorbs best when incident energy flow is normal to surface
– Distance from radiating structure
– Place at least ?/4 from strongly radiating structure
– Place at least ?/10 from weakly radiating structure
– Must be concave to all incident fields from within modeled space
Boundary is ?/4 away from horn aperture in all directions
4-44 ? 2012 ANSYS, Inc. February 1, 2012 Release 14.0
ANSYS, Inc. Proprietary February 23, 2009 ? 2009 ANSYS, Inc. All rights reserved. Inventory #002593
Radiation Boundary: Incidence Angle Dependency
Radiation boundary
functions well for incident
angles less than 25°-30°
Radiation Boundar
Radiation Boundary
Poor absorption of radiation boundary affects radiation pattern
4-45 ? 2012 ANSYS, Inc. February 1, 2012 Release 14.0
ANSYS, Inc. Proprietary February 23, 2009 ? 2009 ANSYS, Inc. All rights reserved. Inventory #002593
Radiation Boundary’s Location
? Radiation Boundary separation distance
– Example probe-fed circular patch
– Varied distance between absorbing boundary condition (ABC) and antenna
? λ /20, λ /10, λ /8, λ /4, λ /2, 3 λ /4, λ
– Examined impact on return loss and gain
0.2 dB variation
?/4 and ? cases
within 13 MHz
of each other
(0.1%)
4-46 ? 2012 ANSYS, Inc. February 1, 2012 Release 14.0
ANSYS, Inc. Proprietary February 23, 2009 ? 2009 ANSYS, Inc. All rights reserved. Inventory #002593
Perfectly Matched Layer (PML)
? Perfectly Matched Layer
– Fictitious lossy anisotropic material which fully absorbs electromagnetic fields
– Two types of PML applications
? “PML objects accept free radiation” if PML terminates free space
? “PML objects continue guided waves” if PML terminates transmission line
– Guidelines for assigning PML boundaries
? Use PML setup wizard for most cases
? Manually create a PML when base object is curved or inhomogeneous
– Parameters to Define:
? Define PML Thic
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