Circuit board structure

1. A circuit board structure for a low noise block down-converter, and used for transmitting a first radio-frequency signal and a second radio-frequency signal across each other, comprising:

a first substrate comprising:

a first wire for transmitting the first radio-frequency signal;

a first grounded wire formed in parallel to one side of the first wire, two ends of the first grounded wire are respectively electrically connected to a first via and a second via; and

a second grounded wire formed in parallel to another side of the first wire, two ends of the second grounded wire are respectively electrically connected to a third via and a fourth via; and

a second substrate electrically connected to the first substrate, and comprising:

a second wire for transmitting the second radio-frequency signal;

a third wire formed on one side of the second wire, and electrically connected to one end of the first wire by a fifth via to transmit the first radio-frequency signal; and

a fourth wire formed on another side of the second wire, and electrically connected to another end of the first wire by a sixth via to transmit the first radio-frequency signal;

wherein the third wire and the fourth wire are indirectly connected to each other, and the first, second, third, fourth, fifth and sixth vias penetrate the first substrate and the second substrate.

2. The circuit board structure of claim 1 , further comprising a spacer disposed on the second substrate, wherein the spacer comprises:

a first separation unit formed between the second wire and the third wire, the first separation unit is electrically connected to one end of the first grounded wire by the first via, and electrically connected to one end of the second grounded wire by the third via; and

a second separation unit formed between the second wire and the fourth wire, the second separation unit is electrically connected to another end of the first grounded wire by the second via, and electrically connected to another end of the second grounded wire by the fourth via;

wherein the first separation unit and the second separation unit are used for shielding or blocking electromagnetic radiations from the first radio-frequency signal and the second radio-frequency signal to prevent the first radio-frequency signal and the second radio-frequency signal from interfering with each other.

3. The circuit board structure of claim 2 , wherein the first substrate comprises a first surface on which the first wire, the first grounded wire and the second grounded wire are formed.

4. The circuit board structure of claim 3 , wherein the first substrate comprises a second surface and a grounded area, the grounded area is formed on the second surface, and electrically connected to the first separation unit and the second separation unit by the first, second, third and fourth vias.

5. The circuit board structure of claim 2 , wherein the second substrate comprises a first surface and a grounded area, the grounded area is formed on the first surface, and electrically connected to the first separation unit and the second separation unit by the first, second, third and fourth vias.

6. The circuit board structure of claim 5 , wherein the second substrate comprises a second surface on which the second wire, the third wire and the fourth wire are formed, and the spacer is disposed on the second surface.

7. The circuit board structure of claim 2 , wherein the first and second separation units have a height, such that the first and second separation units are able to shield or block the electromagnetic radiations from the first radio-frequency signal and the second radio-frequency signal.

8. A low noise block down-converter, comprising:

a circuit board structure for a low noise block down-converter, and used for transmitting a first radio-frequency signal and a second radio-frequency signal across each other, comprising:

a first substrate comprising:

a first wire for transmitting the first radio-frequency signal;

a first grounded wire formed in parallel to one side of the first wire, two ends of the first grounded wire are respectively electrically connected to a first via and a second via; and

a second grounded wire formed in parallel to another side of the first wire, two ends of the second grounded wire are respectively electrically connected to a third via and a fourth via; and

a second substrate electrically connected to the first substrate, and comprising:

a second wire for transmitting the second radio-frequency signal;

a third wire formed on one side of the second wire, and electrically connected to one end of the first wire by a fifth via to transmit the first radio-frequency signal; and

a fourth wire formed on another side of the second wire, and electrically connected to another end of the first wire by a sixth via to transmit the first radio-frequency signal; and

a housing for covering the circuit board structure;

wherein the third wire and the fourth wire are indirectly connected to each other, and the first, second, third, fourth, fifth and sixth vias penetrate the first substrate and the second substrate.

9. The low noise block down-converter of claim 8 , wherein the circuit board structure further comprises a spacer disposed on the second substrate, the spacer comprises:

a first separation unit formed between the second wire and the third wire, the first separation unit is electrically connected to one end of the first grounded wire by the first via, and electrically connected to one end of the second grounded wire by the third via; and

a second separation unit formed between the second wire and the fourth wire, the first separation unit is electrically connected to another end of the first grounded wire by the second via, and electrically connected to another end of the second grounded wire by the fourth via;

wherein the first separation unit and the second separation unit are used for shielding or blocking electromagnetic radiations from the first radio-frequency signal and the second radio-frequency signal to prevent the first radio-frequency signal and the second radio-frequency signal from interfering with each other.

10. The low noise block down-converter of claim 9 , wherein the first substrate comprises a first surface on which the first wire, the first grounded wire and the second grounded wire are formed.

11. The low noise block down-converter of claim 10 , wherein the first substrate comprises a second surface and a grounded area, the grounded area is formed on the second surface, and electrically connected to the first separation unit and the second separation unit by the first, second, third and fourth vias.

12. The low noise block down-converter of claim 9 , wherein the second substrate comprises a first surface and a grounded area, the grounded area is formed on the first surface, and electrically connected to the first separation unit and the second separation unit by the first, second, third and fourth vias.

13. The low noise block down-converter of claim 12 , wherein the second substrate comprises a second surface on which the second wire, the third wire and the fourth wire are formed, and the spacer is disposed on the second surface.

14. The low noise block down-converter of claim 9 , wherein the first and second separation units have a height, such that the first and second separation unit are able to shield or block the electromagnetic radiations from the first radio-frequency signal and the second radio-frequency signal.

15. The low noise block down-converter of claim 8 , wherein a slot area is formed on the housing for containing the first substrate.

16. The low noise block down-converter of claim 15 , wherein the slot area has a slot height, such that the first, second separation unit are able to shield or block electromagnetic radiations from the first radio-frequency signal and the second radio-frequency signal.