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4-Way Wilkinson Power Splitter - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

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?

Thanks. :oops:


Post subject:
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?


Post subject:
Unread postPosted: Wed Jan 26, 2005 1:16 pm

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


Post subject:
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.

Posted  11/12/2012

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