I have desigend a simple Printed dipole but i have been getting a weird rectangular plot (S11 vs freq grap) as my projected is to design Fractal antenna for wireless (2.4GHz) . What my teacher is askin me now is that thie curve should be only one and should fall on 2,4 GHz... can some body please help me and tell me why i m gtting this kindof graph!????
And if somebody have designed a fractal antenna please help me to enhance this or send me the file
Your dipole has apparently a fundamental resonance (λ/2) at about 570 MHz. The order of magnitude looks plausible according to the dimensions. Review your design equations.
Wavelength at 2.4GHz is 12.5cm, so that the total dipole length in air would be lambda/2 = 6.25cm. Each arm is half of that length.
On substrate, it will be even shorter because the effective permittivity is larger than 1.
Ok, but what surprised me: the matching in your simulation gets better again if we look below 1.5GHz.I think this is unexpected for a dipole. Can you simulate down to 100MHz so that we see what happens there?
May i know how can i enhance a printed dipole(5.9cm) antenna to make a koch curve for wireless ... please help me regarding how to draw fractal like this ? do i have to divide 5.9 by 4 and then make each block ?? i m just confused
The center frequency (=length) seems to be basically correct. Don't know if your specification involves additional parameters like impedance or bandwidth.
The frequency step is a bit coarse to see the exact S11 curve. After verifying a reasonable broadband behaviour with this result, you would probably perform a simulation over a narrow range with better frequency resolution.