Printed Dipole (Geometry Design)

[Black-Bone]

I have been studying how to design a printed dipole antenna and I couldn't understand about the width and length of it.
In microstrip design handbook says "typically strip width less than 0.05*wavelength". But I have read many literature, and it's never close to what I have read.
I will appreciate if somone could guide me about the design of printed dipole or what I am missing about the understanding of the width of printed dipole.

 

[WimRFP]

The width of the strip has influence on the useful bandwidth. A wider strip results in more BW (VSWR=2 for example). In case of wide strips, the physical resonant length will be well below 0.5lambda. Also the input impedance at resonance reduces when strip width increases.

In case of lossy material close to the strip, making the strip wider, reduces loss in lossy material that touches the strip. Even wide strips (say 0.1lambda) have reasonable omnidirectional radiation pattern.

Just run some simulation and you will gain some feeling for half wave or full wave strip dipoles.

 

[Black-Bone]

Thank you for your answer WimRFP, it helped me a lot

 

[Black-Bone]

Hi there,

I have one more question about printed dipole array.
Now I designed two element of printed dipole array. The return loss of the two element is shifted up around 100 MHz.
This doesn't make sense for me, because I think when we increase the dimension of antenna, the return loss should be shifted down.
So any factors else can affect to the resonant frequency?

Thank you you all,
Black-Bone

 

[Element_115]

Hi there,

I have one more question about printed dipole array.
Now I designed two element of printed dipole array. The return loss of the two element is shifted up around 100 MHz.
This doesn't make sense for me, because I think when we increase the dimension of antenna, the return loss should be shifted down.
So any factors else can affect to the resonant frequency?

Thank you you all,
Black-Bone

If you were doing L= 1/4 Lamda for F=x then you lengthen the antenna it not only got optimized for freq < x @ 1/4Lamda,
but it also got Optimized for a new freq, L2= 1/2 Lamda @ F= x*2, and L3= 1Lamda @ F3=x*4 ...