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Urgent help regarding printed dipole using HFSS

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kikiko

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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!????:oops:
Capture.PNGCapture1.PNGDSC06818.JPG


And if somebody have designed a fractal antenna please help me to enhance this or send me the file
 
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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.
 

Thanks for the reply ... my supervisor suggested me to increase length from 12cm to 16 cm ...so that means i should reduce the length rite!

- - - updated - - -

So should i decrease the lenght from 16 cm to 13 cm ?
 
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Sir thanks for the reply ... but what do you mean by design equations .. i didnt work with any equation... just barre with me as i m a beginner

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volker@muehlhaus said:
Your dipole is too long for 2.45GHz
Click to expand...


this is the result of smaller dipole reduce from 16cm to 4.5cm

smaller dipole.PNG
 

kikiko said:
my supervisor suggested me to increase length from 12cm to 16 cm
Click to expand...

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.
 
Finally after several trail and error the curve falls on 2.45GHz (Dipole one sided length is 5.9cm)

Capture.PNG
 

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?
 

[Moved]Urgent help needed to design Koch curve

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


DSC06822.JPG
 

volker@muehlhaus said:
Your dipole is too long for 2.45GHz
Click to expand...


hello sir after 2hrs of simulation this is the graph I got of printed dipole … please tell me it is rite


Gap
X: 1cm
Y: 0.5cm


Dipole
X: 0.5cm
Y: 5.8cm

5.8cm.JPG

Finaly.JPG
 

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.
 

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