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I attached here the links from GAP
A Compact UWB Indoor and Through-Wall Radar with Precise Ranging and Tracking
https://publications.lib.chalmers.se/records/fulltext/local_159220.pdf
The New UWB Self-grounded Bow-Tie Antennas and the Applications in Different Systems...
you have to select all parts in the navigation tree then choose in modeling tab export to sat but choose version between 18:20 it is near the name file. (because hfss work with version older then cst). or if you have the new version export to parasolid x_t. then you can import it in Hfss look...
you need to refine the mesh in the port because it needs more then 3 mesh cells in the same profile or you can extrude the coax to get at list 4 mesh cells.
look at
**broken link removed**
http://rf-mw.org/transmission_lines_and_distributed_systems_transmission_lines_transmission_lines_video_lectures.html
and in youtube
http://www.youtube.com/watch?v=g-dM7H1perc
if you don't need ±45° polarization at the same time you can build 2 slant linear polarizer (±45°) and switch between them.
this keep the beamwidth that you need.
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