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Have Confidencein your Measurements……So Your Customers can have Confidence in You.- NVLAP Accredited - ISO 17025 Requirements- Largest Dedicated Quality and Technical Research Teamin the Industry- Uniform Data Taken Across the Full Range and Functionalityof Instruments- Extensive Reference Level Calibration Capabilities- North American Coverage through 17 Calibration Labs- Compliance Services: Analytical Qualification,Validation, RemediationCalibration and Compliance ServicesTRANSCAT.COM • 800.828.1470
METROLOGY 101Millimeter Wave Connector CareAgilent TechnologiesConnectors, adapters, and calibration standards in the millimeter-wave frequency range (26 GHz to 70 GHz) are VERYexpensive. Although all connectors eventually wear, with knowledge, care, and proper technique, you can easily maximizethe accuracy, repeatability, and useful lifetime of coaxial connectors.What Mates With WhatThe outer conductor size of these connectors prevents themating of incompatible connectors. Connectors in each ofthe similarly-shaded areas below have the same size outerconductor and therefore can safely be mated together.However, damage to connectors occurs from wear, lackof cleaning, improper connection techniques, and poorhandling techniques. When mated, a damaged connectorcan cause another connector to also become damaged.Therefore, clean and inspect all connectors before mating.In addition, up to three different grades in each connectortype are usually available. Production grade connectors candamage metrology grade connectors when mated.The first five connector types in the table below use an airdielectric. The name of a connector (ex: 1.85) is determinedby the diameter of the air dielectric. This, along with thenotes in the following table, is the easiest way to identifythese connector types.Note: SMA is a common and inexpensive connectortype, but its lack of precision affects durability andperformance, and can cause increased wear when matedwith precision connectors. SMA connectors are only ratedfor a very limited number of connection cycles and shouldbe examined before each use.Connector Type Frequency Range Mates with... Notes1.0 mm To 110 GHz 1.0 mm Much smaller connector than any of those below.1.85 mm To 70 GHz 2.4 mm2.4 mm To 50 GHz 1.85 mmThe outer thread size of the 1.85 and 2.4connectors is bigger than SMA, 3.5, and 2.92.This makes the area of the outer conductormating surface look very large compared tothe relatively small air dielectric.The 1.85 mm connector that is manufacturedat Agilent has a groove in the male nut andfemale shoulder to distinguish these twoconnector types.2.92 mm To 40 GHz 3.5 mm and SMAThese two connectors use the samecenter pin.3.5 mm To 34 GHz 2.92 mm and SMASMA To 24 GHz 2.92 mm and 3.5 mm Uses a PTFE dielectric.Oct • Nov • Dec 201223Cal Lab: The International Journal of Metrology
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