Impedance Matching in Patch array 60 Ghz

[eraste]

Hello Dear FVM

Yes i'am tested the suggestion of Eraste and no way but this matching i think is good.
(50ohm-70.7ohm-50ohm-70.7ohm-50ohm)
how can i increase the value of S11, is it by modifing the width and length of Patches ?
What parameters I need to modify to improve the Gain and the value of S11.
And Thanks for advance

Hi mirou,

Good news.
I had a look to your array-patches.
In fact your geometry had several mistakes.
I have send you on your email adresse an explanation of the correction.
The result is :
A good gain : about 12 dBi that's the maximum for this four patch array.
A frequency resonnance of : 52 GHz. here you have just to resize the patch element.

Regards.

 

[Terminator3]

FvM, you mentioned complex input impedance of a patch. It is interesting. Do classical inset fed patches have any complex part in impedance? If so, each individual patch could be matched using stub on feeding line?

 

[FvM]

By adjusting length and characteristic impedance of the matching line, you can generally match arbitrary complex load impedances. The matching can be best visualized in a Smith chart.

 

[Terminator3]

I am more interested in complex part of a patch impedance. Most sources provide only real impedance for patch antennas, although in some research papers i have seen open stub matching for each patch in an array, although I am unsure about purpose. Do patch antennas have complex impedance?

 

[FvM]

Do patch antennas have complex impedance?

They are usually designed to expose a real impedance. My point in post #19 is, even if the patch shows a complex impedance due to design faults, it can still be matched.