Spiral-Type Transmission Line with an Mn-Zn Ferrite Core

Spiral-type transmission-line devices using an Mn-Zn ferrite core were developed, which consisted of a spiral winding with a Polyimide dielectric and a ground plane, an Mn-Zn ferrite pot core (TDK; PC-50). The devices exhibited 20-dB attenuation at wide-band frequency range, which was not only due to high frequency loss of the ferrite but also due to the distributed constant circuit operation. To analyze the characteristics, a distributed constant circuit model was introduced considering magnetic coupling between different turns in the spiral winding.link_to_subscribed_fulltex