Key Specifications. Flange Type UG Cover Flange Flange Group Standard Minimum Frequency 26.5 GHz Maximum Frequency 40 GHz Maximum VSWR 1.5:1 Maximum Insertion Loss 0.8 dB Coupling 10 dB. WR-28 Waveguide 10 dB Broadwall Coupler, UG Cover Flange,2.92mm Female Coupled Port, 26.5 GHz to 40 GHz, Copper. The PEW28CP005-10 is a WR-28 Directional Broadwall waveguide coupler with 2.92mm female coupled port that operates inthe frequency range of 26.5 to 40 GHz. This Waveguide component has a maximum VSWR of 1.5:1. These designs are madeof painted copper alloy and incorporate a broad wall configuration that result in a mid-band nominal coupling value of 10, 20,30, 40 or 50 dB. Common applications for this component would be where power measurements are required within a systemfor measuring/sampling power or frequency monitoring with minimal signal loss to the main transmission line. Pasternackoffers a complete family of waveguide Crossguide and Broadwall couplers that are in-stock and ship same day.