Post subject: Simple 1/4 wave 20dB Directional Coupler
Unread postPosted: Tue Mar 22, 2005 7:48 pm
Joined: Tue Mar 22, 2005 7:16 pm
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?
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.
Unread postPosted: Wed Mar 23, 2005 5:00 pm
They should have surface mount directional couplers at the required
frequency range and power
Unread postPosted: Sat Mar 26, 2005 9:19 am
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.