High performance mezzanine connector with low stack height

A low-profile mezzanine connector, comprising:

• a housing comprising insulative material in an insulative portion and lossy material in a lossy portion;
• and
• a plurality of contacts disposed in a plurality of columns, wherein:
• the housing comprises a base having a first side and a second side, opposite the first side;
• the housing comprises a plurality of walls extending from the first side of the base;
• the plurality of contacts each comprises a mating portion, a mounting portion and an intermediate portion joining the mating portion and the mounting portion;
• and
• for each of the plurality of contacts:
• the intermediate portion is disposed in the base;
• the mating portion extends from the base adjacent a wall of the plurality of walls;
• and
• the base comprises:
• a plurality of first type regions in which the insulative material extends partially from the first side to the second side and the lossy material extends partially from the first side to the second side;
• and
• a plurality of second type regions, interspersed with the plurality of first type regions, in which the insulative material extends fully from the first side to the second side.

A low-profile mezzanine connector, comprising:

• a housing comprising a base having a first side and a second side, opposite the first side, and a plurality of insulative walls extending from the first side of the base;
• and
• a plurality of contacts disposed in a plurality of columns, wherein:
• the plurality of contacts each comprises a mating portion, a mounting portion and an intermediate portion joining the mating portion and the mounting portion;
• and
• for each of the plurality of contacts:
• the intermediate portion is disposed in the base;
• and
• the mating portion extends from the base adjacent a wall of the plurality of walls;
• and
• for at least a subset of the plurality of contacts, a portion of a wall of the plurality of walls adjacent to the contact is tapered adjacent the base, whereby an impedance of the contacts in the subset is lowered.