Coplanar High Impedance Wire on Ferrite Substrate: Application to Isolators

Abstract

This article concerns a structure of high-impedance wires (HIW) based on ferrite substrate coplanar waveguide (CPW). Slotted planar stubs are etched on one or two ground planes of the CPW line. Several prototype measurements have been performed showing excellent performance to implement narrow-band microwave isolators. These HIW components can work at low bias-field giving an easier implementation in microwave devices.

Microstrip‐line‐based K‐band isolator and Ku‐band phase shifter with barium hexa ferrite disc

“…Ferrite isolators of different topologies have been discussed in several studies. [2][3][4][5][6][7][8][9][10][11] Ferrite-based isolators and phase shifters are used in high-power applications like phased array radars to attenuate the power getting back to the source and to achieve progressive phase difference between the elements, respectively. Some ferrite phase shifters have been discussed in several studies.…”

“…Especially barium hexaferrite (BHF) can be used in making these devices due to its specific properties, 1 such as good anisotropy, lower conductivity, high‐temperature tolerance, material hardness (after annealing), greater coercivity, and so forth. Ferrite isolators of different topologies have been discussed in several studies 2–11 …”