Need informations for matched impedence

Hi every body

I work in conception of Four (04) Dielectric resonator antenna array and to excite theme, I need to cut the micristrip line in Two to have the T jonction. my problem is in the matched line because in my knowledge, when the line is divised, the outer impedence is 2x the inter ones (if 50 ohm, the outer impedence is 100 Ohm) but I have read a paper of Drossos who have disign an antenna of 4 DR and when he matched the line, the outer impedence is 25 ohm so he used the quartwavelengh transformer of Z0=35.35 ohm. so please which of the two information is truth? mine or of Drossos?
I hope thAT YOU READ MY QUESTION AND ANSWER ME.

Thank<s