Key Specifications. Flange Type CPR-137F Flange Flange Group Standard Minimum Frequency 5.38 GHz Maximum Frequency 8.17 GHz Maximum VSWR 1.25:1 Maximum Insertion Loss 0.6 dB Coupling 10 dB. WR-137 Waveguide 10 dB Broadwall Coupler, CPR137F Flange,N-Type Female Coupled Port, 5.38 GHz to 8.17 GHz, Aluminum. The PEW137CP001-10 is a WR-137 Directional Broadwall waveguide coupler with N female coupled port that operates inthe frequency range of 5.38 to 8.17 GHz. This Waveguide component has a maximum VSWR of 1.25:1. These designs aremade of painted aluminum alloy and incorporate a broad wall configuration that result in a mid-band nominal coupling valueof 10, 20, 30, 40 or 50 dB. Common applications for this component would be where power measurements are requiredwithin a system for measuring/sampling power or frequency monitoring with minimal signal loss to the main transmission line.Pasternack offers a complete family of waveguide Crossguide and Broadwall couplers that are in-stock and ship same day.