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RF Microwave probe heads in different styles and configurations, P style shown, see style page:

Features:
Durable RF probe head
DC to 40 GHz
Insertion loss less than 0.8 db
Return loss greater than 18 db
Measurement repeatability better than -80db
Individually spring loaded contacts
BeCu standard, optional Tungsten or Nickel tips available
Any pitch from 50 to 1250 microns
Variety of footprints
Patented coaxial design

Model 40A Performance Data, G,S,G Configuration
 

• Frequency Range: DC to 40 GHz
• Insertion Loss: Less than 1 db to 40 GHz (.70 db typical)
• Return Loss: Less than 30 db to 4 GHz (35 db typical) Less than 20 db to 26 GHz (23 db typical) Less than 18 db to 40 GHz (20 db typical)
• Crosstalk: Less than 38 db to 40 GHz
  
  Specifications are for the P-style Model 40A Picoprobes with G,S,G configurations and pitches between 50 and 300 microns.The C and T style Model 40A Picoprobes (see the following page for mounting styles)have the same specifications except for the insertion loss, which is less than 1.2 db (0.9 db typical)
  Crosstalk is measured using two probes contacting a bare sapphire substrate 100 microns apart.