Abstract: A magnetostatic wave device comprises a magnetic thin film formed on a non-magnetic substrate, one or a plurality of electrode fingers and pad electrodes formed on the above described magnetic thin film, a magnetostatic wave resonator for exciting and propagating a magnetostatic wave within said magnetic thin film and for causing resonance, and a matching stub connected to at least one of the above described pad electrodes of the above described magnetostatic wave resonator to adjust the impedance of the magnetostatic wave device.

Abstract: A dielectric ceramic composition having a high relative dielectric constant a high quality factor and a small temperature coefficient of resonance frequency, consisting essentially of calcium oxide, strontium, oxide, bismuth oxide and titanium oxide, and having a composition represented by the formula:(CaO).sub.a.(SrO).sub.b.(Bi.sub.2 O.sub.3).sub.c.(TiO.sub.2).sub.dwherein 0.ltoreq.a<30, 0<b.ltoreq.20, 10.ltoreq.c.ltoreq.50, 40.ltoreq.d.ltoreq.80, and 0<a+b.ltoreq.30 by mol %.This composition may contain at least one of thallium oxide, yttrium oxide and manganese oxide and at least one of germanium oxide, zirconium oxide, tin oxide, cerium oxide and hafnium oxide.

Abstract: A lumped constant non-reciprocal circuit element such as a circulator or an isolator comprising a set of mutually insulated central conductors, a garnet plate not more than 0.6 mm in thickness, a ceramic substrate having a central bore for accommodating the garnet plate and patterned electrodes formed thereon, and a permanent magnet for applying a DC magnetic field to the garnet plate. Because of this structure, this circuit element is very thin with good insertion loss properties.