Bidirectional rf switch

[anil.yilmaz.post@outlook.]

Hi all,

I want to have a rf bidirectional duplexer like in the figure below

Can I use regular SPDT rf switch for this ? I want to use MikroElektronika RF Switch which includes MASWSS0115 IC. The datasheet of the MASWSS0115 is below.

https://docs.rs-online.com/890e/A700000007461723.pdf

 

[FvM]

Imilar GaAs SPDT switches are often used for Rx/Tx switching in transceivers. Need to check if maximal transmitter output is within ratings.

 

[anil.yilmaz.post@outlook.]

Thanks, I think my maximum tranmit power would be 16-20 dBm. As far as I understand maximum input power of this chip is more than that.

 

[betwixt]

Maybe use PIN diodes. Just an idea, you haven't mentioned the frequencies being switched or the switching rate.
I use PINs at 150W up to around 150MHz.

Brian.

 

[FvM]

The switch is fine for 20 dBm.

 

[dick_freebird]

There's a huge number of SOI and III-V RF switches out there with a wide range of linearity @power, isolation and nuances (like, if this is a radar, switching speed is a limit to min distance (time of flight vs time to flip)). Many stacked-FET switches have slow gate networks.

You also need to know when you are TXing and RXing to protect the RX front end, OK if it's radar but not so much for random time of arrival comms.

The circulator is the approach for true bidirectional full duplex, switches front ends are for time-division multiplexing architecture.

 

[anil.yilmaz.post@outlook.]

There's a huge number of SOI and III-V RF switches out there with a wide range of linearity @power, isolation and nuances (like, if this is a radar, switching speed is a limit to min distance (time of flight vs time to flip)). Many stacked-FET switches have slow gate networks.

You also need to know when you are TXing and RXing to protect the RX front end, OK if it's radar but not so much for random time of arrival comms.

The circulator is the approach for true bidirectional full duplex, switches front ends are for time-division multiplexing architecture.

Thanks, I have SDR (Software defined radio), I do not expect random time arrivals signals, I expect to dictate when to transmit and receive, my main concern is 22dB isolation of that switch. Is that enough for application which needs sensitive sensing?

 

[FvM]

my main concern is 22dB isolation of that switch. Is that enough for application which needs sensitive sensing?

Depends on spurious output level of transmitter channel, we don't know it.

 

[vivekroy]

Hi all,

I want to have a rf bidirectional duplexer like in the figure below

Can I use regular SPDT rf switch for this ? I want to use MikroElektronika RF Switch which includes MASWSS0115 IC. The datasheet of the MASWSS0115 is below.

https://docs.rs-online.com/890e/A700000007461723.pdf

Are you sure this part can meet your linearity requirements?

 

[D.A.(Tony)Stewart]

I have tested PIN diodes in Iridium TxRx up to 6 GHz.

In CATV experiments I found hybrid directional couplers have interesting properties when the Rx side is shorted the Tx port loss is <0.5 dB instead of 3.5 and visa versa also acting as a Duplexer.

 

[anil.yilmaz.post@outlook.]

Are you sure this part can meet your linearity requirements?

Sorry, I dont have enough knowledge about this, can you provide any document related to this issue