| 摘要 |
PURPOSE:To obtain the device with low cost and high reliability by using a gradient function material whose dielectric property depends on the operating frequency of the circuit as a dielectric board so as to constitute the high frequency circuit device. CONSTITUTION:A microwave signal fed to an input connector 5 is amplified by a GaAsFET 7, converted into an intermediate frequency by a microwave frequency converter 8, the intermediate frequency signal is amplified by an amplification IC 9 and outputted to an output connector 6. The amplifier employing the FET 7 and the converter 8 are formed on one and same alumina board 1 in this device and a low frequency circuit comprising the IC 9 and a power supply section is formed on a glass epoxy board 2. Moreover, a part 3 between the board 1 and the board 2 is a part whose property varies gradually from one board to the other board. Thus, since the expensive board 1 is not employed for a wide range, low cost is attained. Since no laminating part exists, the board is hardly destroyed and high reliability is obtained. |
