Practical matching of complex input impedance of a dipole

[usman_mahfooz]

Need Guidance
OK i have a dipole whose Zi changes due to close proximity of parasitic elements.
Complex input impedance is 150+160i .
And its surely complex (not 200 ohm ) due to parasitic effects
How can i achieve it practically.
Can Quarter Wave transformer be used in this case. if it can how can i use it somehow with a balun. I m using a 50 ohm coaxial.
Thanks in Advance

 

[royal1428]

what's the operating frequency?
you can design a matching network for each arm of the dipole to convert the (150+160i)/2=75+80i to 25Ohm, then quarter wavelength balun can be connected after that matching newtwork?

below is an example(f=2.4G):

 

[jiripolivka]

If you already know the complex impedance of your dipole (or any device), use Smith diagram to find how to transform it into a matched line impedance. All basic RF textbooks have the method described in detail.

 

[biff44]

A standard method (but narrowband) is to add a length o 50 ohm transmission line to rotate your complex impedance so that the imaginary part goes to zero. At that point, read the real impedance and use your quarterwave transformer to match that.