| 摘要 |
PROBLEM TO BE SOLVED: To obtain a bias circuit which will not influence amplifier characteristics in a required frequency band, absorbs unwanted waves in a wideband, starting from a low-frequency band to a high-frequency band and can suppress voltage drop to a very small extent. SOLUTION: All the unwanted waves in a high-frequency band are absorbed, and the bias circuit which stably operates over a wideband is obtained by constituting the bias circuit, by connecting a second tip opening line whose length is outside the desired frequency and having a quarter wavelength in the center position of a second transmission line and serially connecting resistance for absorbing the unwanted waves outside the desired frequency. COPYRIGHT: (C)2008,JPO&INPIT
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