The second pad 130 may include a second recess 132. The second recess 132 may be formed at the inner corner of the second pad 130. The second recess 132 may be configured to receive the second electrode of the passive element. The second recess 132 may have a shape and a size substantially the same as the shape and the size of the second recess 132 in FIG. 1. Thus, the upper surface of the insulation substrate 110 may be exposed through the second recess 132.

The third pad 140 may include a third recess 142. The third recess 142 may be formed at the inner corner of the third pad 140. The third recess 142 may be configured to receive the third electrode of the passive element. The third recess 142 may have a shape and a size substantially the same as the shape and the size of the first recess 122 in FIG. 1. Thus, the upper surface of the insulation substrate 110 may be exposed through the third recess 142.

The fourth pad 150 may include a fourth recess 152. The fourth recess 152 may be formed at the inner corner of the fourth pad 150. The fourth recess 152 may be configured to receive the fourth electrode of the passive element. The fourth recess 152 may have a shape and a size substantially the same as the shape and the size of the second recess 132 in FIG. 1. Thus, the upper surface of the insulation substrate 110 may be exposed through the fourth recess 152.