SFBs can have 2 to 6 channels and operate from 0.1 GHz to 6.0 GHz in SMT or connectorized housings.  Low Insertion Loss:  1:0 to 3.0 dB Typ., Return Loss:  12 dB min., Isolation:  22 to 60 dB, Power Supply:  5 VDC, Switching Speed 135 ns Typ., Prices as low as $250 for production qty’s.  Please note, this does NOT obsolete 3H robust mil SFBs with an operating range from 0.1 GHz to 18.0 GHz, including high power options.  
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