HTS shielded dielectric resonators

Single crystal dielectrics and HTS thin films have been shown to possess very high quality factors (Q). This makes them highly desirable in the area of cellular and satellite communications. A disadvantage is that single Crystal dielectrics are expensive. Dielectrics resonators produced by sintering are well known but generally do not possess high enough Q factors to offer significant performance advantage. We show that by careful attention to the quality of the ceramic processing and to the sintering conditions, very high Q dielectric resonators can be produced. Room temperature Q of 5×10⁴ is routinely measured at 10 GHz. We present preliminary results on sintered dielectrics and HTS thick film shields which demonstrate that Q´s well in excess of 10⁵ are achievable at 10 GHz and 77 K. This opens up the possibility of constructing inexpensive filters with exceptionally low insertion loss