Coupled microstrip phase shifters

Van Keuls, F.W, C.H Mueller, F.A Miranda, R.R Romanofsky, C.L Canedy, S Aggarwal, T Venkatesan, Ramamoorthy Ramesh, J.S Horwitz, W L Chang, and W.J Kim. "Room temperature thin film BaxSr1-xTiO3 Ku-band coupled microstrip phase shifters: effects of film thickness, doping, annealing and substrate choice." IEEE MTT-S International Microwave Symposium Digest. Vol. 2. IEEE, Piscataway, NJ, United States, 1999. 737–740.