I need to design a DP8T microwave switch for a microwave imaging senior design project. The frequency range is 2 to 6 GHz.

I need to switch between 8 antennas and a 2 port VNA. So each antenna transmitting and receive one at a time. I'd imagine this is a common problem in RF engineering, but I can not find an IC chip or a commercial solution that is 2X8.

Switching time: Doesn't matter

Power: 16 dBm

Insertion Loss ~ .8 dB

Isolation > 30 dB

Control signal: TTL or CMOS

Above all, I will settle for anything that can work. I want to have a start at something even if I can improve later. My budget is very limited, even though I have access to PCB printing and lab equipment.

  • \$\begingroup\$ Power, switching time, acceptable loss, reflective or absorbing??? \$\endgroup\$ – Dean Franks Mar 12 '18 at 19:17
  • \$\begingroup\$ To be clear, you really need to design one? Or do you just need to include one in your system? \$\endgroup\$ – Blair Fonville Mar 12 '18 at 19:38
  • \$\begingroup\$ Generally, you can't if you have to ask here \$\endgroup\$ – PlasmaHH Mar 12 '18 at 21:08

I'd be thinking about using pin diodes to act as multiplexers. Here's one that might be useful: -

enter image description here

There are plenty of internet articles that describe how pin diodes are used for this type of application.

  • \$\begingroup\$ Can you provide an example of a 2X8 two lines active? Something dumb proof please. \$\endgroup\$ – Waleed Mar 19 '18 at 22:20
  • \$\begingroup\$ Imagine it was plain ordinary signals (not especially RF) and draw a switch arrangement that would be ok for (say) audio and embed this into your question. Message me when you have done this. \$\endgroup\$ – Andy aka Mar 19 '18 at 23:13

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