4GHz∼50GHz wide bandwidth high linearity and low hysteresis magnetic circuit for magnetically tuned filter

This paper describes a design method of wide bandwidth, high linearity, low hysteresis magnetic circuit for magnetically tuned filter, and analyzes the key technology .Through the analysis of magnetic field, design a new type magnetic circuit, and improve the performance of the magnetic circuit. In the frequency band of 4GHz~50GHz, the hysteresis is less than 60MHz and the linearity deviation is less than 160MHz, meets the needs of wideband millimeter-wave test equipment. And put forward a transformation method of hysteresis loop, in this way, we can visually see the hysteresis and linearity, in wide frequency band.