SP4T using PIN Diodes

[srujan1708]

how to design SP4T switch in C-band using PIN diodes?
please help me.

 

[Marat86]

This circuit of SP3T switch. I think that the circuit of SP4T switch can be designed analogically.

https://obrazki.elektroda.pl/1_1331901678.jpg

And the circuit of SP4T switch can be designed by combining basic SPDT switches.

https://obrazki.elektroda.pl/37_1331901958.jpg
https://obrazki.elektroda.pl/74_1331901958.jpg

 

[srujan1708]

i am not getting wide bandwidth

 

[rf1008]

https://obrazki.elektroda.pl/1_1331901678.jpg i think this is a good idead for 4T app. in which BW is not a problem and easy for design. but need attention for layou.

 

[srujan1708]

for spdt i am getting bandwidth(4-8GHz) but sp4t i am not getting. I attached schematics.

https://obrazki.elektroda.pl/12_1333104401.jpg
https://obrazki.elektroda.pl/54_1333104401.jpg
https://obrazki.elektroda.pl/57_1333104401.jpg
https://obrazki.elektroda.pl/19_1333104401.jpg

 

[Marat86]

I approximately modeled circuit...

Parameters of pin-diodes were replaced by equivalent resistance and capacity.

Below results were obtained with CST

But here length connections should be minimum in field of serial connection pin-diodes.