Hilbert fractal curves for HTS miniaturized filters - Microwave Symposium Digest, 2004 IEEE MTT-S International

This work presents novel compact High Temperature Superconductor (HTS) microstrip resonators based on Hilbert fractal curves. Their miniaturization performance has been investigated, emphasizing the parameters which allow to obtain a good trade off between compact size and quality factor. Hilbert resonators with different arrangements have been designed and assessed by using full wave simulators. I n ader tu experimentally verify our analysis, a four pole quasi elliptic filter, in the cascade quadruplet configuration, with 5 close tu 2.45GHz, have been fabricated by patterning a 10x10mm2YBCO film on MgO substrates. Minimum insertion losses of the order of (0.1-0.2) dB have been measured. Index Terms Microstrip filters, High-Temperature Superconductors, Fractals, Microwave devices, Mobile Communication.