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Half duplex antenna switching (RF Switch)

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syedhamzahasan

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Hi all,

I want to make an half duplex RF Switch for antenna to switch from Receiver to Transmitter. I know it can be done using pin diodes and relays. But before implementing the traditional approach, I went for latest available RF Switch ICs. I found some SPST switches but with different results, money is not a problem. My requirements are RF1, RF2, RFC (RF Common for antenna) with 60db isolation between RF1 and RF2, frequency range is 1.5 MHz to 30 MHz. I would look forward to any help that could benefit me regarding designing, selecting, even block diagram of connectivity of Rx, Tx and antenna. I have attached pic 1 and pic 2. Picture 1 is ideal but could settle for picture 2 as well.

Thanks
 

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    TR Switch.png
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    TR Switch.png
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  • TR Switch (1).png
    TR Switch (1).png
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Last edited:

No:1 is a -no doubt- appropriate configuration.
But I guess the TX Output Power is high.. Right ?? If it's so, you should pay attention when selecting the Switches because Solid State RF Switches can handle -maybe- few Watts but I think your TX Output Power is much higher than this.You have to use RF relays in this case..
 

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