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X281C Coaxial Waveguide Adapter, APC-7, 8.2 to 12.4 GHz

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Starting From US$ 1,202

Typical Configuration  

Typical Configuration

X281C Coaxial to waveguide WR-90 adapter, 8.2 to 12.4 GHz

  • X281C-701 APC-7 with 4 alignment holes on waveguide flange
  • R-51B-001-C Return to Keysight Warranty - 1 year


Prices for: United States

* Prices are subject to change without notice. Prices shown are Manufacturer's Suggested Retail Prices (MSRP). Prices shown are exclusive of taxes.

Key Features & Specifications

Superior RF Performance

  • Maximum SWR: 1.05


  • Waveguide Designator: EIA WR-90 MIL-W-85/1-077
  • Flange Designator: UG-135/U MIL-F-3922/54C-008
  • Optional Connector: Type-N female (see picture) or Type-N male


The Keysight X281C adapter transforms waveguide transmission line into 50-ohm coaxial line. Power can transmitted in either direction, and each adapter covers the full frequency range of its waveguide band with SWR less than 1.3.