impedance matching of a coaxial cable and a microstrip patch
impedance matching of a coaxial cable and a microstrip patch
(OP)
how can I make a match between the microstrip patch antenna and the coaxial cable using the HFFS program
need help plz
need help plz
RE: impedance matching of a coaxial cable and a microstrip patch
If the patch is thin, the coax. needs to be closer to the center of the patch.
The thicker patch requires the coax. to be nearer the edge.
Start half way between the center and the edge, then move the coax. and see if it gets better, adjust accordingly.
The coax. has to come from under the ground plane of course.
kchiggins
RE: impedance matching of a coaxial cable and a microstrip patch
RE: impedance matching of a coaxial cable and a microstrip patch
Center conductor to top patch, outer conductor to patch ground plane. Make sure the length of the input cable is 1/4 wavelength or longer or HFSS gives you erroneous S11. Add a radiation boundary keeping it outside the antenna by ? half wavelength.
HFSS is a complicated beast, lots of errant outputs.
The HFSS latest revisions Rev. 9.5 & 10 added so little to rev 8.5, a friend of mine sold all his stock in Ansoft instantly. Sounds like IE3D and CST Microwave Studio will catch up and pass Ansoft in the coming years. It's still a good program, but it seems the management thinks so much of it that not improving it is adequate.
kch