I assume you use Agilent Momentum on Agilent ADS.
But you can do your task by using distributed components elements without using Momentum.
If you would like to design Hybrid alone, do 4port S-parameter analysis.
If you would like to design 1:4 power divider alone, do 5port S-parameter analysis.
If you would like to design a combination of Hybrid and 1:4 power divider, do 7port S-parameter analysis.
hieuphong wrote on Nov 11th, 2010, 7:42am:the first: I need to find a switch or mutiplexer at output
I don't think any switch or multiplexer is required in designing.
hieuphong wrote on Nov 11th, 2010, 7:42am:the second: I have to design real circuit
Do you want to design actual SP4T switch ?
I think your designing targets are Hybrid and 1:4 Power Divider not SP4T switch.
However if you would like to use switch, use the following as three cascaded blocks.
http://edocs.soco.agilent.com/display/ads2009U1/SPDT+Static+%28Single+Pole+Doubl....
Or create your own switch by using Verilog-A.
Again, do you think your power dividers can work properly without termination ?
If you use "multiplexer", you have to terminate all unused outputs.
This is very true even if you implement actual switch using pin-diode.
This is very true even if you use commercial product of SP4T switch such as followings.
http://www.analog.com/static/imported-files/data_sheets/ADG904_904R.pdfhttp://www.peregrine-semi.com/pdf/datasheets/pe42641ds.pdfAnd this is also true for Hybrid.
Again, I don't think any switch or multiplexer is required at all in your designing tasks.