The terminal of 180 hybrid coupler

[2steps]

Hi, all:

I design 8GHz 180 hybrid couple using PCB microstrip to generate differential input signal to test 8GHz divider by2 circuit as figure shown,But I have a question: Is the Port 3 of the coupler is terminated by 50ohm load ,open or short ?

Thanks!!!

 

[biff44]

50 ohm load is desired.