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Old 04-13-2012, 08:03 PM
EngIntoHW EngIntoHW is offline
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Join Date: Apr 2010
Posts: 128
Thumbs down Your opinion on RF switch

Thanks to Steve's help (ssnyde), I found an RF switch which seems suite to my cellular application.

I'll connect 2 cellular mobile phones (DUT + Reference) to the RF output ports, and an external antenna (located at the roof) to the input port.

The RF switch I found is CCR-33S3O - SPDT, 12V FAILSAFE, DC-18GHZ (
(133$ per unit)

This is its spec:

I actually need only DC - 3GHz (not DC - 18GHz), but haven't found one with that range.

I'd like to ask a few questions please:

They don't mention in datasheet that DC should be blocked at the input/output ports, but the schematic doesn't include any DC block capacitors.
Does it make sense that the RF connector can absorb DC voltage that might be transmitted from the cellular mobiles or come from the antenna?

Does the 60dB Isolation refer to Isolation between the 2 output ports or to the Isolation between the not-connected input port and the output port?

Does the below graph mean that in the DC - 3GHz range, the switch can handle up to ~80W at each input/output port?

Thank you very much!
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File Type: jpg System2.jpg (16.4 KB, 14 views)
File Type: jpg System3.jpg (43.2 KB, 14 views)
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