The following matches a 50 Ohm line to a 100 Ohm load at 10 GHz using a double-stub component. This was designed using the ADS passive circuit DesignGuide tool. This method is a great alternative to using the Smith Chart matching tool for lumped elements if you need a microstrip line for matching.
Circuit:
Substrate:
Momentum simulation result (can be tuned to center better at 10 GHz):
Layout component:
RF Photonics Lab 