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.
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
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.