https://www.dolphmw.com/products/waveguide-combiners-dividers-hybird/ Dolph Microwave offers a standard product line of 3dB Waveguide Combiners/Dividers covering waveguide sizes WR340 thru WR28. typically used for power distribution or power combination. It features small volume, the standard coupling level is 3-30dB, the phase difference is 90° at distribution holes. The flange type and sizes can be custom made as per customer's specific requirements. Taking WR229 and WR137 type as example as below. More other waveguide type requirement, please contact.All Rights Reserved