Board-to-board radio frequency coaxial connector

1. A board-to-board radio frequency coaxial connector, comprising:

an adapter;

a clamping socket arranged at a first end of the adaptor and including:

a first outer conductor;

a first inner conductor arranged coaxially in the first outer conductor; and

a first insulator arranged between the first inner conductor and the first outer conductor; and

a fixed socket arranged at a second end of the adaptor and including:

a second outer conductor;

a second inner conductor arranged coaxially in the second outer conductor; and

a second insulator arranged between the second inner conductor and the second outer conductor;

wherein the adapter includes:

a third outer conductor;

a third inner conductor arranged coaxially in the third outer conductor; and

two third insulators arranged at two ends of the third inner conductor, respectively, and sleeved on an outside of the third inner conductor, the two third insulators being arranged coaxially with the third inner conductor and between the third inner conductor and the third outer conductor, wherein each of the two third insulators includes:

a body portion and an auxiliary portion arranged around the body portion, wherein a first through-hole is arranged between the body portion and the auxiliary portion, a second groove recesses inwardly from an outer circumferential surface of the body portion, a second through-hole is arranged at a center of the body portion and extends axially to arrange the third inner conductor in the second through-hole,

wherein:

two ends of the third outer conductor are electrically connected to the first outer conductor and the second outer conductor, respectively; and

the two ends of the third inner conductor are electrically connected to the first inner conductor and the second inner conductor, respectively.

2. The board-to-board radio frequency coaxially connector of claim 1 , wherein the third insulator is formed by an injection molding process.

3. The board-to-board radio frequency coaxially connector of claim 1 , wherein the third outer conductor includes:

a fourth outer conductor including a first end and a second end; and

two fifth outer conductors covering outsides of the two third insulators and being electrically connected to the first end and the second end, respectively.

4. The board-to-board radio frequency coaxially connector of claim 3 , wherein:

the fourth outer conductor is cylindrical;

the fourth outer conductor includes a first groove recessed inwardly from an outer circumferential surface of the fourth outer conductor;

the first groove extends along a circumferential direction;

the fourth outer conductor is formed by stretching a copper tube;

the first groove is formed by a primming process; and

the fourth outer conductor is made of brass.

5. The board-to-board radio frequency coaxially connector of claim 3 , wherein the fifth outer conductor is formed by punching and wrapping a beryllium copper belt.

6. The board-to-board radio frequency coaxially connector of claim 1 , wherein:

the third inner conductor is formed by punching and wrapping a beryllium copper belt;

the third inner conductor includes a middle portion and two end parts; and

inner diameters of the two end parts are less than an inner diameter of the middle portion;

the two third insulators are sleeved on the two end parts, respectively;

the two end parts are coaxially arranged with the third insulator;

a second step is arranged at a junction between the middle portion and one of the two end parts; and

an end of the third insulator abuts against the second step.

7. The board-to-board radio frequency coaxially connector of claim 6 , wherein:

each of the two end parts is provided with a tapered clamping portion configured to clamp the first inner conductor and the second inner conductor, respectively.

8. The board-to-board radio frequency coaxially connector of claim 3 , wherein:

the first outer conductor includes an inner wall;

the inner wall is flat; and

the fifth outer conductor contacts the inner wall.

9. The board-to-board radio frequency coaxially connector of claim 8 , wherein:

the clamping socket further includes a sixth outer conductor coaxially arranged at an outside of the first outer conductor; and

the sixth outer conductor includes a guide surface configured to guide the fifth outer conductor to contact the inner wall of the first outer conductor.

10. The board-to-board radio frequency coaxially connector of claim 4 , wherein the fifth outer conductor includes:

an end portion connected to the fourth outer conductor and located in the fourth outer conductor, the end portion abutting against an outer wall of the first groove; and

an extension portion having a free end including a protrusion contacting the first outer conductor.

11. The board-to-board radio frequency coaxially connector of claim 10 , wherein:

each of the first end and the second end of the fourth outer conductor contracts inwardly to form a slope;

an inner diameter of the extension portion is smaller than an inner diameter of the end portion;

a first step is formed at a junction between the end portion and the extension portion, wherein the first step cooperates with and contacts the slope.