Method of measuring relative dielectric constant of dielectric substance of powders, cavity resonator used in the same, and application apparatus

Abstract

A relative dielectric constant of a mixed substance consisting of powders and a liquid medium is calculated, and then the relative dielectric constant of the mixed substance or a relative dielectric constant of the liquid medium is calculated as a relative dielectric constant of the powders when the relative dielectric constant of the mixed substance 18 becomes equal to a relative dielectric constant of the liquid medium. Therefore, the relative dielectric constant of the powders can be measured with high precision even in a high-frequency band in excess of several GHz.

1 . A cavity resonator comprising 
 at least one opening portion into which a measured dielectric substance is inserted is formed in a center portion of the cavity resonator in an axis direction; and    a supporter formed on an outside of the opening portion,    wherein a relationship h/d between a length d of the opening portion and a length h of the supporter is set to 0.5 or more.    
   
   
       2 . A cavity resonator which is used in a method of measuring a relative dielectric constant of powders that comprises the steps of sealing a mixed substance consisting of powders and a liquid medium in a resonator, then inputting an electromagnetic wave into the resonator, then calculating a relative dielectric constant of the mixed substance based on a response of the electromagnetic wave, and then calculating a relative dielectric constant of the powders from the relative dielectric constant of the mixed substance and a relative dielectric constant of the liquid medium, the cavity resonator comprising: 
 at least one opening portion into which a measured dielectric substance is inserted is formed in the cavity resonator; and    a supporter is formed on an outside of the opening portion,    wherein a relationship h/d between a length d of the opening portion and a length h of the supporter is set to 0.5 or more.    
   
   
       3 . A cavity resonator which is used in a method of measuring a relative dielectric constant of powders comprising the steps of sealing a mixed substance consisting of powders and a liquid medium in a resonator, then inputting an electromagnetic wave into the resonator, then calculating a relative dielectric constant of the mixed substance based on a response of the electromagnetic wave, and then calculating a relative dielectric constant of the powders from the calculated relative dielectric constant of the mixed substance and a volume ratio of the powders in the mixed substance, and the cavity resonator comprising: 
 at least one opening portion into which a measured dielectric substance is inserted is formed in the cavity resonator; and    a supporter is formed on an outside of the opening portion,    wherein a relationship h/d between a length d of the opening portion and a length h of the supporter is set to 0.5 or more.    
   
   
       4 . A dielectric substance measuring system for inserting a rod-like-shaped dielectric substance into the cavity resonator set forth in any one of  claims 1  to  3 , then measuring a resonant frequency and an unloaded Q value of the cavity resonator, and then measuring a relative dielectric constant and a dielectric loss tangent of the inserted rod-like dielectric substance based on the measured results.  
   
   
       5 . A resonator for implementing a target resonance characteristic by inserting a rod-like-shaped dielectric substance into the cavity resonator set forth in any one of  claims 1  to  3 .  
   
   
       6 . A filter for implementing a target resonance characteristic by inserting a rod-like-shaped dielectric substance into the cavity resonator set forth in any one of  claims 1  to  3 .