Electronic-element mounting package and electronic device
An electronic-element mounting package includes a wiring substrate having a first surface and a wiring pattern thereon; a base having a second surface and a through hole whose opening is on the second surface; a signal line penetrating the through hole and having a first end exposed from an opening of the through hole; and an insulating member between an inner surface of the through hole and the signal line and has an end portion and a main portion. The end portion has an end surface on a side of the opening of the through hole, and the main portion is farther from the opening of the through hole than the end portion. The electronic-element mounting package also has a conductive joining material with which the wiring pattern and the first end are joined. Permittivity of the end portion is larger than permittivity of the main portion.
1. An electronic-element mounting package comprising:
a wiring substrate that has a first surface and a wiring pattern on the first surface;
a base that has a second surface and a through hole, the through hole having an opening on the second surface;
a signal line that penetrates the through hole and has a first end, the first end being exposed from the opening of the through hole;
an insulating member that occupies a space between an inner surface of the through hole and the signal line and has an end portion and a main portion, the end portion having an end surface located on a side of the opening of the through hole, and the main portion being located farther from the opening of the through hole than the end portion; and
a conductive joining material with which the wiring pattern and the first end of the signal line are joined,
wherein permittivity of the end portion of the insulating member is larger than permittivity of the main portion of the insulating member.
2. The electronic-element mounting package according to claim 1 , wherein
the end portion of the insulating member has a first portion adjacent to the main portion and a second portion adjacent to the first portion and including the end surface, and
permittivity of the second portion is larger than permittivity of the first portion.
3. The electronic-element mounting package according to claim 2 , wherein
permittivity of the end portion of the insulating member is larger as being closer to the end surface.
4. The electronic-element mounting package according to claim 1 , wherein
the first end of the signal line does not protrude from the end surface of the insulating member.
5. The electronic-element mounting package according to claim 1 , wherein
the signal line has a protruding portion that includes the first end and protrudes from the end surface of the insulating member, and
the protruding portion is covered with the conductive joining material.
6. The electronic-element mounting package according to claim 1 , wherein
the insulating member is glass.
7. The electronic-element mounting package according to claim 1 , wherein
the end portion of the insulating member is resin, and
the main portion of the insulating member is glass.
8. The electronic-element mounting package according to claim 1 , wherein
a length of the end portion of the insulating member in a direction along the signal line is smaller than a quarter of a wavelength of a signal transmitted by the signal line.
9. An electronic device comprising:
the electronic-element mounting package according to claim 1 ; and
an electronic element that is joined to the wiring pattern.