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Simple 1/4 wave 20dB Directional Coupler - RF Cafe Forums

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Below are all of the forum threads, including all the responses to the original posts.


JohnF
Post subject: Simple 1/4 wave 20dB Directional Coupler
Unread postPosted: Tue Mar 22, 2005 7:48 pm
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Joined: Tue Mar 22, 2005 7:16 pm
Posts: 1
I finding myself moving up in frequency to a design at 2.5-2.7GHz. It seems that this frequency band is not a high-volume market area so most of the off-the-shelf components are rated up to 2.5G.

My question is: does anyone know of a manufacturer of surface mount Directional Couplers and Baluns in my frequency range?

I've checked out Murata's Chip Multilayer Hybrid Baluns and Couplers, but they fall short of my frequency requirements.

Max RF power is 1W.

Or, would it be easier just to design my own simple 1/4 wave Directional Coupler to add to the board layout?

Thanks,
-j

_________________
John


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Rod
Post subject:
Unread postPosted: Wed Mar 23, 2005 12:03 pm

My opinion is that it would be much easier to design one yourself. I've had good success designing similar coupler using Microwave Office.


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Guest
Post subject:
Unread postPosted: Wed Mar 23, 2005 5:00 pm

Tried Minicircuits?
They should have surface mount directional couplers at the required frequency range and power


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Guest
Post subject:
Unread postPosted: Sat Mar 26, 2005 9:19 am

One very important point - the etching tolerances can play merry hell with couplers, although 20dB should not present too great a problem, tighter couplings are more sensitive.

In my experience, you rarely get exactly what you designed :)

Don't use FR4 - it's too variable to be any good for repeatability.




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