4-6 GHz Balun design?

Question

4-6 GHz Balun design?

prototypingfool (Electrical)

(OP)

8 Apr 10 15:11

I'm prototyping a small dipole antenna from 4-6GHz and am looking for a good reference design for something in that frequency range. There are a number of chip baluns available but have a higher insertion loss. I'm etching the antenna on standard FR-4 pcb.

I'm hoping there is a "balun calculator" someone has ran across, or maybe to point me in the right direction. Thanks in advance,

Frank

Higgler (Electrical) · Answer 1 · 2010-04-08 16:19:31

any vendor 180 degree stripline connectorized hybrid will do.
4-8 ghz is a standard band.

That's a wide band for a standard dipole, I hope your arms are very thick and possibly tapered.

Why make a dipole?
I'd suggest a notch antenna or a discone or a bicone. No baluns needed and much easier to build. If you need it to be planar on a circuit card, you can do that with these antennas too.

prototypingfool (Electrical) · Answer 2 · 2010-04-08 16:26:36

I meant loop antenna (sorry) and why would a 180degree hybrid do the job?

Yes, etching.

F

prototypingfool (Electrical) · Answer 3 · 2010-04-08 16:31:03

Also, i'll need it up to about 5 watts, so a reference design i can etch would be ideal.

f

Higgler (Electrical) · Answer 4 · 2010-04-09 11:33:36

balun's and 180 hybrids are essentially the same name for two different items.

Hence, look up 180 degree stripline hybrid designs or balun designs in the books on Amazon

here's a book on amazon. Do the "seach inside this book" and you'll find out if they have 180 coplanar hybrid designs.
http://www.amazon.com/Coplanar-Waveguide-Circuits-Components-Systems/dp/0471161217/ref=sr_1_1?ie=UTF8&s=books&qid=1270827026&sr=8-1

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4-6 GHz Balun design?