Ferrite Tuned Dual-Mode Dielectric Resonator Filters (original) (raw)

This paper is devoted to the design and construction of a novel technique for ferrite tuning of dielectric loaded, dual-mode cavity filters. This is dealt with in two specific areas: i) Improving the technique to realize a high -Q , low loss, dielectric-loaded, dual-mode cavity band-pass filter, using the hybrid 11 HEM δ mode, ii) Developing techniques to obtain a wide range tuning mechanism, using ferrite materials. The designed dual-mode filters offer unloaded u Q of more than 10,000 with an insertion loss less than 1 dB. It is shown that ferrite tuning is possible either at below resonance or at the above resonance state, depending upon the strength of the applied DC magnetic field. Experimental results showed that due to its lower saturation magnetization YIG offers a wider tuning range compared with Nickel ferrite.