Here’s the page we think you wanted. See search results instead:


Contact an Expert

R281B Coaxial Waveguide Adapter, 2.4 mm (m), 26.5 to 50 GHz

Sold By:

Starting From US$ 2,025

Typical Configuration  

Typical Configuration

R281B Coaxial to Waveguide Adapter, 2.4 mm male to WR-28, 26.5 to 40 GHz

  • R281B-0B0 Download the Product Manual from the Keysight website


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: 1.13


  • Waveguide Designator: EIA WR-28 MIL-W-85/3-009
  • Flange Designator: UG-599/U MIL-F-3922


The Keysight R281B 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.

Learn more about latest information on Keysight waveguide adapters.