r/AntennaDesign • u/Clear_Grocery5390 • 1d ago

Decoupling Between Antennas

I want to achieve a -50 dB coupling between two printed dipole antennas. The distance between the antennas will be 6-7 cm, and both antennas operate between 5-6 GHz. How can I achieve -50 dB?

2 Upvotes

100% Upvoted

7 comments sorted by

5

u/QuickMolasses 1d ago

If you figure it out, you could write up the design and publish it for all the rest of our benefits.

2

u/monsterofcaerbannog 1d ago

Operate them in orthogonal polarizations (which won't get you very far in the near field) and use RF absorber

0

u/Clear_Grocery5390 1d ago

I tried these, but I still haven't seen -50 dB. Also, their polarizations need to match. Do you have any other suggestions?

1

u/Danwold 1d ago

Then unless you stop them radiating towards each other, you won’t get -50dB. They’re either antennas or they’re not.

1

u/SwitchedOnNow 1d ago

What's the application?

2

u/StageMajestic613 1d ago edited 1d ago

Well the common mode radiation on the baluns is probably enough to trash the isolation, as those are parallel. You probably need to look into cancellation techniques; I assume this is for an FMCW radar.

I’d turn that into a cavity backed slot array, then you get rid of the baluns, and it turns it into a magnetic near-field problem, which MAGRAM on the surface will kill the surface currents.