The R109-1 from Microwave Engineering Corporation is a Waveguide Tee with Frequency 4.8 to 11 GHz, Isolation 12 to 30 dB, Isolation(Co-linear arms) 30 dB (Isolation, E – H Ports), Isolation(E & H arms) 12 to 17 dB (Isolation, Colinear Ports). Tags: Magic Tee. More details for R109-1 can be seen below.