Tdk Corporation

Katsufumi Ehata

Shuhei Someya

Hirofumi Tomita

Shinichi Tsuchiya

Mitsuyuki Nara

Yoshinobu Shimokura

Disclosed herein is a bias tee circuit connected between a common terminal and power supply and signal terminals, the bias tee circuit includes a capacitor inserted between the common terminal and the signal terminal, and first and second inductors inserted in series between the common terminal and the power supply terminal. The first inductor is connected on a side of the common terminal. The second inductor is connected on a side of the power supply terminal. The second inductor is higher in self-resonance frequency and lower in Q value than the first inductor.

Bias tee circuit and PoC circuit using the same

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 where the relative dielectric constant of the mixed substance 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.

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

An electromagnetic wave is input to a resonatorfilled with a dielectric and a gas, and a resonance frequency, an insertion loss and a half-power width in the resonance mode of the electromagnetic wave output from the resonatorare measured by a network analyzerin response to the input of the electromagnetic wave and the complex dielectric constant of the dielectric is calculated from the resonance frequency, the insertion loss and the half-power width which are thus measured.

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Tokyo, Japan

Katsufumi Ehata