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fix antenna design
the poor impedance matching maybe due to the poor radiation performance, the poor radiation performance maybe due to the too small height of the substrate. you can try to adjust the feeding point to improve S11.
Antenna Software
for simple wire antennas, I think, the NEC is the best one. Both the exe files and the source files are available freely online. As to the design of electrical small antennas, the NEC is convinent to combine with any optimization algorithm to fulfil optimization design.
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