Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
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Below are all of the forum threads, including all
the responses to the original posts.
Post subject: 4-way Wilkinson power splitter
Unread postPosted: Wed Dec 29, 2004 10:54 pm
I would like to design a four-way Wilkinson power splitter at 100 MHz. I would like to split the 1 W power in
to two Wilkinson splitters, starting the design on microstrip. The four, quarter wavelength would be realised
using 75-Ohm coaxial cable, and each cable would terminate in to 50 Ohm. My question is could I place the two
100-Ohm resistors at the start off each separate pair of ¼ wavelength coaxial splits on the circuit board?
Unread postPosted: Mon Jan 24, 2005 6:09 pm
Can I have more info to help you. Are you saying to start with a characteristic impedance of 75 ohms and
end it with 50 ohms?
Unread postPosted: Wed Jan 26, 2005 1:16
I'm sure the Zo = 50ohms. For a Wilkinson Splitter the quarte wave lines = Z = 50 * (SQRT)2.
Which is 70.7 ohms, 75 coax is usually close enough.
The 4 100ohm resistor need to be between the outputs
of the spitters
to acheive good isolation.
That's my 1 cent
Unread postPosted: Sat Mar 26, 2005 9:44 am
Sorry guys, you're on the wrong track here - at
100Mhz use lumped elements , unless you like wasting money on coax cable.
I have sucessfully used lumped
element wilkos at 500 MHz.