Ferrite/Dielectric High Power Phase Shifter Development. Part I. The TEM Phasor

摘要

The significance of this research and development to the Air Force is the finding that Coplanar Waveguide (CPW) can be used for integrated reciprocal ferrite phase shifters. Studies considered the use of Arc-Plasma Sprayed ferrite and dielectrics in TEM-like phase shifter design. Analysis of operation is given showing that deviation occurs as a result of coupling to higher order modes. Flux drive switching is studied and the relations between the flux density and the magnetic field which describe the ferrite magnetostatic hysteresis loop, including minor loop trajectories are given. These relations allow much improved modeling of latched phaser operation. Extensive experimental results are shown for CPW reciprocal phasers, including the effects of housings on performance. A new slabline coax-to-CPW transition is also described. Best results obtained in C-band include nearly 70 deg/in. latched phase shift for a one-inch long device. Numerous measurements indicate that the CPW attenuation is about 0.55 db/In. in the range of 6.5-8 GHz. High power measurements show that power capability can be enhanced by 2 orders of magnitude by use of APS dielectric buffer layers between the center conductor and ferrite.