RESONATOR FOR MEASURING CHARACTERISTIC OF LUMPED-CONSTANT ELEMENT

摘要

PURPOSE:To perform a precise test of a lumped-constant element with the back surface earthed, by connecting the element to be tested to the central part of a both-end- opened microstrip resonance line, and by adjusting the electric connection of the element with a measuring circuit by means of screws made of dielectric and having each a disk shape metal leaf. CONSTITUTION:Dielectric base plates 28 and 29 are provided in a case 23 serving also as an earthing conductor, and inner-strip conductors 24-27 are formed on the base plates 28 and 29. Input and output contact plugs 21 and 22 are connected to the conductors 24 and 27 respectively, while a both-end-opened resonator is constituted by the conductors 25 and 26. A lumped-constant element 30 to be tested is connected to the central part of the resonator by bonding wires 31 and 32, and the back 37 of the element 30 is connected to the case 23. In addition, adjusting screws 33 and 34 made of dielectric and having round metal leaves 35 and 36 at the ends respectively are provided in the upper part of a gap capacitance formed of the conductors 24, 25 and 26, 27. By this constitution, the characteristic of the lumped-constant element in a microwave band can be measured procisely in the state of its actual employment, i.e. in the state that its back surface is earthed.