Serial electrical connector

1. A serial electrical connector comprising:

a connector jack; and

a connector plug; wherein the connector plug comprises:

an audio plug comprising a tip, an end opposite to the tip, and a hollow cylindrical space formed throughout a center of the audio plug;

a coaxial cable being inserted into and filling the hollow cylindrical space; and

an engagement element being disposed at the tip of the audio plug and configured to electrically connect the audio plug to the connector jack;

wherein the coaxial cable extends from the tip of the audio plug to the end of the audio plug.

2. The serial electrical connector of claim 1 , wherein the coaxial cable comprises a conductor, an insulator layer surrounding the conductor, and a conductive shield surrounding the insulator layer; and wherein each of the conductor, the insulator layer and conductive shield extends from the tip of the audio plug to the end of the audio plug; and an end of the conductor exits from the hollow cylindrical space.

3. The serial electrical connector of claim 2 , wherein the connector plug further comprises at least three metal contacts surrounding the coaxial cable, wherein one of the metal contacts is physically connected with the conductive shield of the coaxial cable.

4. The serial electrical connector of claim 3 , wherein the connector plug comprises four metal contacts surrounding the coaxial cable, the four metal contacts corresponding respectively to “tip”, “ring, “ring” and “sleeve” of a standard TRRS audio plug structure.

5. The serial electrical connector of claim 1 , wherein the connector plug further comprises a non-conductive housing surrounding the coaxial cable.

6. The serial electrical connector of claim 2 , wherein the connector plug further comprises a layer of conductive material surrounding the coaxial cable, the layer of conductive material being in contact with the conductive shield of the coaxial cable.

7. The serial electrical connector of claim 1 , wherein the connector jack is enclosed by a non-conductive housing and is supported by a supporting structure.

8. The serial electrical connector of claim 3 , wherein the connector jack comprises a plurality of metal contacts configured for engaging with the metal contacts of the connector plug respectively.

9. The serial electrical connector of claim 8 , wherein the connector jack further comprises an extension cable, the extension cable being connected with the coaxial cable in the connector plug.

10. The serial electrical connector of claim 8 , wherein the connector jack comprises an interconnect block and a RF connector, a coaxial structure being embedded inside the interconnect block, the coaxial structure being configured for engaging with the RF connector and being electrically connected with the coaxial cable inside the serial electrical connector.

11. A connection assembly comprising:

an extending cable;

a serial electrical connector plug attached to an end of the extending cable; wherein:

the connector plug comprises an audio plug which comprises a tip, an end opposite to the tip, and a hollow cylindrical space formed throughout a center of the audio plug;

a coaxial cable being inserted into and filling the hollow cylindrical space; and

an engagement element being disposed at the tip of the audio plug and configured to electrically connect the audio plug to a connector jack and wherein the coaxial cable extends from the tip of the audio plug to the end of the audio plug; and the coaxial cable is connected to the extending cable forming a continuous waveguide.

12. The connection assembly of claim 11 , wherein the extended cable comprises a coaxial cable in the center and at least three wires surrounding the coaxial cable, the coaxial cable of the extended cable being connected with the coaxial cable of the connector plug.

13. The connection assembly of claim 12 , wherein the connector plug further comprises at least three metal contacts surrounding the coaxial cable thereof, the metal contacts of the connector plug being connected with the wires of the extended cable.

14. The connection assembly of claim 12 , wherein the coaxial cable of the extended cable comprises a core metal, an insulator or dielectric layer surrounding the core metal, a metal shielding layer surrounding the insulator or dielectric layer, and a coaxial cable jacket surrounding the shielding layer.

15. A serial electrical connector plug comprising:

an audio plug comprising a tip, an end opposite to the tip, and a hollow cylindrical space formed throughout a center of the audio plug;

a coaxial cable being inserted into and filling the hollow cylindrical space; and

an engagement element being disposed at the tip of the audio plug and configured to electrically connect the audio plug to a connector jack;

wherein the coaxial cable extends from the tip of the audio plug to the end of the audio plug.

16. The serial electrical connector plug of claim 15 further comprising at least three metal contacts surrounding the coaxial cable, wherein the coaxial cable comprises a conductor, an insulator layer surrounding the conductor, and a conductive shield surrounding the insulator layer.

17. The serial electrical connector plug of claim 16 , wherein one of the metal contacts is physically connected with the conductive shield of the coaxial cable.

18. The serial electrical connector plug of claim 16 further comprising four metal contacts surrounding the coaxial cable, wherein the four metal contacts correspond respectively to “tip”, “ring, “ring” and “sleeve” of a standard TRRS audio plug structure.

19. The serial electrical connector plug of claim 15 further comprising a non-conductive housing surrounding the coaxial cable.

20. The serial electrical connector plug of claim 16 further comprising a layer of conductive material surrounding the coaxial cable, wherein the layer of conductive material is in contact with the conductive shield of the coaxial cable.