Improved design of broad-band latching ferrite phase shifter in a reduced-size grooved waveguide

In this paper, an improved design of a broad-band latching ferrite phase sh ifter in grooved waveguide is discussed. The elimination technique for the insertion-loss peak is also introduced. The little gaps between the metal b ars and waveguide wall are beneficial to suppress the high-order modes caus ed by the filling of high constant dielectric in the ferrite toroid. The th eoretical and measured results have shown that the changes in differential phase shift with frequency remains less than 2.2%; the insertion loss and v oltage standing-wave ratio of the device are good over the band 2 similar t o4 GHz.