Portable communication unit and internal antenna used for same

1. A portable communication unit comprising:

a printed circuit board on which a radio unit comprising a transmitter and a receiver is mounted,

a grounding pattern on the printed circuit board,

an internal antenna which is an inverted F shaped antenna and which includes a reflecting plane connected with the grounding pattern,

an antenna metal element having a first end and a second end, wherein the first end is directly connected with a feeding point of said internal antenna at an output end thereof, and the second end of the antenna metal element is brought into direct electrical contact with a feeding terminal formed on said printed circuit board at an input end thereof,

a front case, and

a rear case which is provided with a space for accommodating said internal antenna, and, wherein said internal antenna is supported between said rear case and said printed circuit board,

wherein a conductive painting is applied to a predetermined region of an inner surface of said rear case, and brought into contact with the grounding pattern of said printed circuit board, and wherein said reflecting plane, said conductive painting, and said grounding pattern form a grounding plane, and the electrical contact between the antenna metal element and the feeding terminal of the printed circuit board is secured by pressure exerted on a contact surface therebetween.

2. The portable communication unit according to claim 1 , wherein:

said space in said rear case for accommodating said internal antenna is a cavity which is fit for said internal antenna.

3. The portable communication unit according to claim 1 , wherein:

said conductive painting is applied to a region which is opposite to said radio unit at least.

4. The portable communication unit according to claim 1 , wherein the reflecting plane is a parasitic element that is driven solely by electromagnetic coupling with a driven element of the antenna.

5. The portable communication unit of claim 1 , wherein the antenna metal element is held directly in contact with the feeding terminal formed on the printed circuit board by a solderless connection.

6. A portable communication unit comprising:

a printed circuit board on which a radio unit comprising a transmitter and a receiver is mounted,

a grounding pattern on the printed circuit board,

an inverted F shaped internal antenna,

an antenna metal element having a first end and a second end, wherein the first end is directly connected with a feeding point of said internal antenna at an output end thereof, and the second end of the antenna metal element is brought into direct electrical contact with a feeding terminal formed on said printed circuit board at an input end thereof, wherein the electrical contact between the antenna metal element and the feeding terminal of the printed circuit board is secured by pressure exerted on a contact surface therebetween,

a front case,

a rear case which is provided with a space for accommodating said internal antenna, wherein said internal antenna is supported between said rear case and said printed circuit board,

a conductive painting is applied to a predetermined region of an inner surface of said rear case, and brought into contact with the grounding pattern of said printed circuit board,

said internal antenna includes:

a radiator which is situated inside said rear case and connected with said metal element,

a reflecting plane which is situated opposite to said radiator maintaining a predetermined interval therebetween, and connected with the grounding pattern, and

connecting terminals which connect an edge of said reflecting plane with said conductive painting.

7. An internal antenna of a portable communication unit which is accommodated in a casing comprising a front case and a rear case together with a printed circuit board, comprising:

a radiator situated inside said rear case,

an antenna metal element having a first end and a second end, wherein the first end is directly connected with said radiator at an output end thereof, and the second end of the antenna metal element is brought into direct electrical contact with a feeding terminal formed on said printed circuit board at an input end thereof, wherein the electrical contact between the antenna metal element and the feeding terminal of the printed circuit board is secured by pressure exerted on a contact surface therebetween,

a reflecting plane which is situated opposite to said radiator maintaining a predetermined interval therebetween, and includes a reflector connected with a grounding pattern on the printed circuit board,

a conductive painting which is applied to an inner surface of said rear case and brought into contact with a grounding pattern of said printed circuit board, wherein the reflecting plane, the conductive painting, and the grounding pattern form a grounding plane, and

connecting terminals which connect an edge of said reflecting plane with said conductive painting via contacting means.

8. A portable communication unit comprising:

a rear case,

a printed circuit board including a grounding pattern and a feeding terminal,

an internal antenna supported between said rear case and said printed circuit board, and including a reflecting plane connected with the grounding pattern, and

an antenna metal element having a first end and a second end, wherein the first end is directly connected with said internal antenna, and the second end of the antenna metal element is in direct electrical contact with the feeding terminal on said printed circuit board,

wherein a conductive painting is applied to a predetermined region of an inner surface of said rear case, and brought into contact with the grounding pattern of said printed circuit board, and wherein said reflecting plane, said conductive painting, and said grounding pattern form a grounding plane, and the electrical contact between the antenna metal element and the feeding terminal of the printed circuit board is secured by pressure exerted on a contact surface therebetween.

9. The portable communication unit according to claim 8 , further comprising an insulator located between said internal antenna and said reflecting plane.

10. The portable communication unit according to claim 8 , further comprising a connecting terminal connected with said reflecting plane and configured to extend said grounding pattern to the rear case.

11. The portable communication unit according to claim 10 , wherein said conductive painting applied to said rear case is in contact with said connecting terminal.

12. An inverted F shaped internal antenna for a portable communication unit that includes a front case, a rear case, and a printed circuit board, the internal antenna comprising:

a radiator situated inside said rear case,

an antenna metal element having a first end and a second end, wherein the first end is directly connected with said radiator, and the second end of the antenna metal element is in direct electrical contact with a feeding terminal on said printed circuit board and secured by pressure exerted on a contact surface therebetween,

a reflecting plane connected with a grounding pattern on said printed circuit board,

a connecting terminal connected with said reflecting plane, and

a conductive painting applied to said rear case and in contact with the connecting terminal and brought into contact with the grounding pattern of said printed circuit board, and wherein said reflecting plane, said conductive painting, and said grounding pattern form a grounding plane.