Because the ground pattern of the ground plane 4a extends to the upper layer above the land 41b, the capacitance formed between the extending ground pattern and the land 41b is also a part of the capacity formation section (1). The increase in the capacitance of the capacity formation section (1) is useful for the suppression of unnecessary interference between the antenna element 100 connected to the coaxial line 12A and the high frequency filter 1.

Further, the spacing between the first electric conduction pads provided for the first substrate 4 and the third electric conduction pads provided for the third substrate 6 corresponds to the spacing between the capacity formation section (1) and the capacity formation section (3) which are mentioned above. More specifically, the spacing between the lands 41a, 41b and 41c and the lands 61a, 61b, 61c and 61d is d1, as shown in FIG. 3. Further, the spacing between the third electric conduction pads disposed in the third substrate 6 and the second electric conduction pads disposed in the second substrate 5 corresponds to the spacing between the capacity formation section (3) and the capacity formation section (2). More specifically, the spacing between the lands 61a, 61b, 61c and 61d and the lands 51a, 51b and 51c is d2, as shown in FIG. 3.