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APC-7 connector
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{{Infobox connector |name = APC-7 |type = [[RF connector|RF coaxial connector]] |image = [[File:Apc7_1.png|300px]] |logo = |caption = Recessed threads (left), Protruding threads (right) |designer = |design_date = |manufacturer = Originally [[Amphenol]], then [[Hewlett-Packard]], then others |diameter = {{convert|7|mm|in|abbr=on}} |width = |height = |electrical = |earth = |maximum_voltage = |maximum_current = |cable = |passband = 0β18 GHz |physical_connector = }} The '''APC-7 connector''' (also referred to as a '''7 mm connector''') is a precision coaxial connector used on [[laboratory]] [[microwave]] test equipment for frequencies up to 18 [[GHz]]. APC-7 connectors are advantageous because they have a low [[reflection coefficient]], make repeatable [[coaxial cable|coaxial]] connections, and are [[Gender of connectors and fasteners|genderless]].<ref name="HP1979p90">{{Cite book|title=Coaxial & Waveguide Catalog and Microwave Measurement Handbook|publisher=Hewlett-Packard|year=1979|location=Palo Alto, CA|pages=90|id=5952-8207D}}</ref> The connectors are expensive, so they are seldom used outside the laboratory where their cost can be justified by their accuracy and convenience. Due to their high cost, their 18 GHz frequency limitation, and new laboratory practices,<ref group=note>Connections at the instrument front panel don't need to be repeatable because those connections remain mated during tests. Modern network analyzers focus on the reference plane near the device under test and have features such as automated calibration, adapter removal, and models for calibration references. The advantages of the APC-7 connector have been diminished.</ref> the connectors are now uncommon. Modern low-frequency microwave equipment often uses the less expensive 3.5 mm (26.5 GHz) connector. Higher-frequency equipment must use higher-performance connectors such as the 2.92 mm (40 GHz), 2.4 mm (50 GHz), 1.85 mm (67 GHz), or 1.0 mm (110 GHz) connectors.<ref>{{cite web|date=2009-05-03|title=Microwave Coaxial Connectors|url=http://www.microwaves101.com/encyclopedia/connectors.cfm|url-status=dead|archive-url=https://web.archive.org/web/20090512011851/http://www.microwaves101.com/encyclopedia/connectors.cfm|archive-date=2009-05-12|access-date=2010-04-05|website=www.microwaves101.com}}</ref>
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