Portable computer and antenna distance setting mechanism

1. An apparatus comprising:

a main housing accomodating system elements therein;

an upper housing attached to the main housing;

a radio antenna having a ground and a radiating element, wherein the radio antenna is movably attached to the upper housing;

a cover formed of a dielectric material and arranged so as to cover the radio antenna; and

an antenna distance setting mechanism, wherein the antenna distance setting mechanism sets a predetermined distance between the radiating element and an inner wall of the cover.

2. The apparatus according to claim 1 , wherein the radio antenna has a requested resonance frequency when the radio antenna is arranged at the predetermined distance from a dielectric material.

3. The apparatus according to claim 1 , wherein the antenna distance setting mechanism sets a distance between the radiating element and the inner wall of the cover to the predetermined distance in conjunction with attachment of the cover to the upper housing.

4. The apparatus according to claim 1 , wherein the antenna distance setting mechanism includes an elastic member which applies an elastic force in the direction in which the radio antenna is pressed against the inner wall of the cover.

5. The apparatus according to claim 4 , wherein the antenna distance setting mechanism includes a stopper, wherein the stopper protrudes more toward the inner wall of the cover than the radiating element and sets the predetermined distance between the radiating element and the inner wall of the cover upon pressing the stopper against the inner wall of the cover with the elastic force of the elastic member.

6. The apparatus according to claim 4 , wherein the antenna distance setting mechanism includes an antenna supporting member having a first end, a second end and a middle portion, and further wherein the antenna supporting member supports the radio antenna and is movably attached to a side surface of the upper housing.

7. The apparatus according to claim 6 wherein the antenna supporting member is formed of a synthetic resin and has elasticity at both ends thereof, and further wherein the middle portion of the antenna supporting member bulges so as to be closer to the inner wall of the cover than both of the ends.

8. The apparatus according to claim 4 , wherein the ground is arranged along a bottom surface of the upper housing;

wherein the radiating element is bent approximately 90° from the ground; and

wherein the antenna distance setting mechanism sets the predetermined distance between by sliding the ground along the bottom surface of the upper housing.

9. The apparatus according to claim 1 , wherein the radio antenna is an inverted F-type antenna used in a wireless WAN.

10. The apparatus according to claim 1 , wherein the upper housing is formed of metal, and further wherein the cosmetic cover is detachably attached to the upper housing.

11. An apparatus comprising:

an antenna distance setting mechanism which sets a predetermined distance between a radiating element of a radio antenna and an inner wall of a cover;

wherein the radio antenna is pressed against the inner wall of the cover to the predetermined distance upon the radio antenna being covered with the cover.

12. The apparatus according to claim 11 , wherein the radio antenna has a requested resonance frequency when the radio antenna is arranged at the predetermined distance from a dielectric material of the cover.

13. The apparatus according to claim 11 , wherein the antenna distance setting mechanism sets a distance between the radiating element and the inner wall of the cover to the predetermined distance in conjunction with attachment of the cover to an upper housing of a computer.

14. The apparatus according to claim 11 , wherein the antenna distance setting mechanism includes an elastic member that applies an elastic force in the direction in which the radio antenna is pressed against the inner wall of the cover.

15. The apparatus according to claim 14 , wherein the antenna distance setting mechanism includes a stopper, wherein the stopper protrudes more toward the inner wall of the cover than the radiating element and sets the predetermined distance between the radiating element and the inner wall of the cover upon pressing the stopper against the inner wall of the cover with the elastic force of the elastic member.

16. The apparatus according to claim 14 , wherein the antenna distance setting mechanism includes an antenna supporting member having a first end, a second end and a middle portion, and further wherein the antenna supporting member supports the radio antenna and is movably attached to a side surface of the upper housing.

17. The apparatus according to claim 16 , wherein the antenna supporting member is formed of a synthetic resin and has elasticity at both ends thereof, and further wherein the middle portion of the antenna supporting member bulges so as to be closer to the inner wall of the cover than both of the ends.

18. The apparatus according to claim 10 , wherein the radio antenna is an inverted F-type antenna used in a wireless WAN.

19. The apparatus according to claim 10 , wherein the upper housing is formed of metal, and further wherein the cosmetic cover is detachably attached to the upper housing.

20. An apparatus comprising:

a display; and

an antenna distance setting mechanism which sets a predetermined distance between a radiating element of a radio antenna and an inner wall of a cover, wherein the radio antenna is pressed against the inner wall of the cover to the predetermined distance upon the radio antenna being covered with the cover; and

wherein the radio antenna is arranged within the display.