Design of dual-band phase offset line with arbitrary phase shift at two operational frequencies

A simple and successful design for an arbitrary phase shift at two operational frequencies by using a T-section with only a single dual-band stub-loaded line is presented, and the design equations are derived analytically. For verification, a proposed dual-band phase offset line is fabricated and measured at 1618.25 and 2491.75 MHz of the `COMPASS´. The results show that there is good agreement between the measured and the electromagnetic simulations.