| 摘要 |
PURPOSE:To realize high performance by a simple structure and low man-hour by constituting the coil of a low pass filter using a conductor foil on the back of a substrate and separating the coil and a band pass filter by the conductor foils of the surface and back connected by a trough hole. CONSTITUTION:Output from an up conversion section 28 enters a down conversion section through a through capacitor 24 that forms a part of a low pass filter, and passes through the coil 26 of the low pass filter formed of a conductor foil. The output of the low pass filter is connected with the input of the band pass filter 27 through the conductor foil 26. The periphery of the low pass filter is enclosed by grounding the conductor foils 31 of the surface and back of a substrate connected by through holes 30 made at the intervals of about 2mm to prevent the passing through of signals in the direction of thickness of the substrate 29. At the time of assembling, the through capacitor 24 is attached separately with a fitting 25 and soldered, and after inserting substrates 28, 29, a partition plate 25 is inserted from the back side of the substrate along a partition plate 22, and dip soldered.
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