marchand balun

According to a paper on IEEE, "LTCC Full-Matching Marchand Balun", as a three-port lossless network, the conventional Marchand baluns can not be matched simultaneously at all ports. And in the paper, the full-matching balun is proposed and fabricated. the circuit is in the table below:

but I don't know why it can work. Could someone here help me to figure it out?

And if I don't want to use the resistor here, can I use a paticular width of stripline as a alternative?

I want to set the desired points to zero, but I don't know how.......