激励端口与边界的设置（英文）

Sizing Handbook I Microstrip Port Sizing Guidelines Assume width of microstrip trace is w Assume height of substrate dielectric is h Port Height Guidelines Between 6h and 10h Tend towards upper limit as dielectric constant drops and more fields exist in air rather than substrate Bottom edge of port coplanar with the upper face of ground plane (If real structure is enclosed lower than this guideline, model the real structure!) Port Width Guidelines 10w, for microstrip profiles with w ≥ h 5w, or on the order of 3h to 4h, for microstrip profiles with w < h w h 6h to 10h 10w, w ≥ h or 5w (3h to 4h), w < h Note: Port sizing guidelines are not inviolable rules true in all cases. For example, if meeting the height and width requirements outlined result in a rectangular aperture bigger than λ/2 on one dimension, the substrate and trace may be ignored in favor of a waveguide mode. When in doubt, build a simple ports-only model and test. Ansoft High Frequency Structure Simulator v 9.0 Training 23 Excitations and Boundary Conditions Sizing Handbook II Stripline Port Sizing Guidelines Assume width of stripline trace is w Assume height of substrate dielectric is h Port Height Guidelines Extend from upper to lower groundplane, h Port Width Guidelines 8w, for microstrip profiles with w ≥ h 5w, or on the order of 3h to 4h, for microstrip profiles with w < h Boundary Note: Can also make side walls of port Perfect H boundaries w h 8w, w ≥ h or 5w (3h to 4h), w < h Ansoft High Frequency Structure Simulator v 9.0 Training 24 Excitations and Boundary Conditions Sizing Handbook III Slotline Port Guidelines Assume slot width is g Assume dielectric height is h Port Height: Should be at least 4h, or 4g (larger) Remember to include air below the substrate as well as above! If ground plane is present, port should terminate at ground plane Port Width: Should contain at least 3g to either side of slot, or 7g total minimum Port boundary must intersect both side ground planes, or they will ‘float’ and become signal conductors relative to outline ‘ground’ g Approx 7g minimu m h Larger of 4h or 4g Ansoft High Frequency Structure Simulator v 9.0 Training 25 Excitations and Boundary Conditions Sizing Handbook IV CPW Port Guidelines Assume slot width is g Assume dielectric height is h Assume center strip width is s Port Height: Should be at least 4h, or 4g (larger) Remember to include air below the substrate as well as above! If ground plane is present, port should terminate at ground plane Port Width: Should contain 3-5g or 3-5s of the side grounds, whichever is larger Total about 10g or 10s Port outline must intersect side gro and become additional signal conductors along with the center strip.