This dipole antenna is a result from my experiments with fractal structures I did in the past few weeks.
The antenna design is a half wave dipole based on a Koch fractal curve. Advantage of the fractal is the reduced physical dipole size while the electrical length is equal to lambda/2.
Comparing the physical length of 278mm for a straight dipole to 168mm of the Koch fractal, there is a reduction of ~40%.
The antenna was designed for 433MHz and will be used together with my EzUHF.
My indention is to place a dipole on the outside of each the Winglet.
I made two version of the antenna which are different in shape of the fractal curve and which also results in different physical length of the antennas.
Board size is 200mmx40mm and 170mmx40mm.
Return loss could be better but is a trade-off for smaller dimensions of the dipole trace. A width trace will result in better return loss but length must be increased then.
Simulation vs. measurement results: