Layout of rat race mixer

Hello, I'm designing a rat race mixer, I have a problem with the layout, its the first time I use it. I have some question about it:

1.what is the right way to connect the rat race coupler to the diodes, and when do I need to do the impedance matching? (if I will make the impedance matching but It will not reach to the diode, i will have to add more lines and to do impedance matching again, but now the length of the stub will be different)

2.what is the recommended way to connect the rat-race coupler with the diodes? (Mlines, Mcurves, Mtapers??)
what are the things that I need to put my attention on?

3.each time I press layout->generate/update layout, most of the components moving in the layout, is there any way to make them stay in their places?

klp said:

3.each time I press layout->generate/update layout, most of the components moving in the layout, is there any way to make them stay in their places?

Click to expand...

You need to use an MTEE for the T junction where the lines connect to the ring.

I can't comment on the other questions.

volker@muehlhaus said:

You need to use an MTEE for the T junction where the lines connect to the ring.

I can't comment on the other questions.

Click to expand...

Hi, I have two diodes there, so I believe that I don't need MTEE. Am I wrong?
I have added a screenshot of the diodes.

I mean this (missing) MTEE, which tells ADS layout what diretion to route to.



Just putting multiple elements to the same node is confusing to layout auto-placement.