Electronic device, and radio-frequency device and signal transmission component thereof
The present disclosure provides an electronic device, and a radio-frequency device and a signal transmission component thereof. The signal transmission component is operable in an operating frequency band and applied in a radio frequency device having a signal connector and a radio frequency circuit. The signal transmission component includes a signal transmission line and an electrostatic protection unit. The signal transmission line is disposed between the signal connector and the radio frequency circuit. The electrostatic protection unit is electrically connected to the signal transmission line, and includes a connecting end and a grounding end. An impedance of the electrostatic protection unit is greater than an impedance of the signal transmission line. An electrical length is defined between the connecting end and the grounding end, and the electrical length is less than ¼ of a wavelength corresponding to a lowest operating frequency within the operating frequency band.
1. A radio frequency device operable in an operating frequency band, comprising:
a signal connector;
a radio frequency circuit;
a signal transmission line disposed between the signal connector and the radio frequency circuit;
an electrostatic protection unit that is electrically connected to the signal transmission line, and that includes a connecting end electrically connected with the signal transmission line, and a grounding end; and
a carrier board, the signal transmission line and the electrostatic protection unit are disposed on the same surface of the carrier board;
wherein an impedance of the electrostatic protection unit is greater than an impedance of the signal transmission line;
wherein an electrical length is defined between the connecting end and the grounding end, and the electrical length is less than ¼ of a wavelength corresponding to a lowest operating frequency within the operating frequency band; and
wherein the grounding end of the electrostatic protection unit is electrically connected to the grounded metal layer, and wherein a separating distance is between the electrostatic protection unit and the grounded metal layer.
2. The radio frequency device according to claim 1 , wherein the electrical length is greater than 1/40 of the wavelength corresponding to the lowest operating frequency within the operating frequency band.
3. The radio frequency device according to claim 1 , further comprising a carrier board, the signal transmission line and the electrostatic protection unit being disposed on the carrier board, wherein the carrier board includes a first surface and a second surface opposite to the first surface, the electrostatic protection unit is disposed on the first surface, a grounded metal layer is disposed on the second surface, and the grounding end of the electrostatic protection unit is electrically connected to the grounded metal layer, and wherein the grounded metal layer includes a first hollow area, and a vertical projection of the first hollow area on the carrier board and a vertical projection of the electrostatic protection unit on the carrier board at least partially overlap with each other.
4. The radio frequency device according to claim 3 , wherein the grounded metal layer further includes a second hollow area, a spacer is between the first hollow area and the second hollow area, and a vertical projection of the second hollow area on the carrier board and a vertical projection of the electrostatic protection unit on the carrier board at least partially overlap with each other.
5. The radio frequency device according to claim 1 , wherein the material of the signal transmission line and the material of the electrostatic protection unit are the same, and a width of the electrostatic protection unit is smaller than a width of the signal transmission line.
6. The radio frequency device according to claim 1 , wherein the electrostatic protection unit includes a transient voltage suppressor element and a grounding line electrically connected to the transient voltage suppressor element, and the transient voltage suppressor element and the grounding line are connected in series with each other.
7. The radio frequency device according to claim 1 , wherein the electrostatic protection unit is a grounding line, one end of the grounding line is the connecting end, the other end of the grounding line is the grounding end, and the material of the grounding line and the material of the signal transmission line are the same.
8. The radio frequency device according to claim 1 , wherein the ¼ of the wavelength corresponding to the lowest operating frequency within the operating frequency band is related to a dielectric coefficient of the carrier board.
9. A signal transmission component operable in an operating frequency band and applied in a radio frequency device having a signal connector and a radio frequency circuit, the signal transmission component comprising:
a signal transmission line disposed between the signal connector and the radio frequency circuit;
an electrostatic protection unit that is electrically connected to the signal transmission line, and that includes a connecting end electrically connected with the signal transmission line, and a grounding end; and
a carrier board, the signal transmission line and the electrostatic protection unit are disposed on the carrier board;
wherein an impedance of the electrostatic protection unit is greater than an impedance of the signal transmission line;
wherein an electrical length is defined between the connecting end and the grounding end, and the electrical length is less than ¼ of a wavelength corresponding to a lowest operating frequency within the operating frequency band; and
wherein the ¼ of the wavelength corresponding to the lowest operating frequency within the operating frequency band is related to a dielectric coefficient of the carrier board.
10. The radio frequency device according to claim 9 , wherein the electrical length is greater than 1/40 of the wavelength corresponding to the lowest operating frequency within the operating frequency band.
11. The radio frequency device according to claim 9 , wherein the material of the signal transmission line and the material of the electrostatic protection unit are the same, and a width of the electrostatic protection unit is smaller than a width of the signal transmission line.
12. The radio frequency device according to claim 9 , wherein the electrostatic protection unit includes a transient voltage suppressor element and a grounding line electrically connected to the transient voltage suppressor element, and the transient voltage suppressor element and the grounding line are connected in series with each other.
13. The radio frequency device according to claim 9 , wherein the material of the electrostatic protection unit and the material of the signal transmission line are different.
14. An electronic device using a radio frequency device, the radio frequency device operable in an operating frequency band, the radio frequency device includes a signal connector, a radio frequency circuit, a signal transmission line, an electrostatic protection unit, and a carrier board, wherein the signal transmission line is disposed between the signal connector and the radio frequency circuit, the electrostatic protection unit that is electrically connected to the signal transmission line, and the electrostatic protection unit includes a connecting end electrically connected with the signal transmission line, and a grounding end, and the signal transmission line and the electrostatic protection unit are disposed on the same surface of the carrier board;
wherein an impedance of the electrostatic protection unit is greater than an impedance of the signal transmission line;
wherein an electrical length is defined between the connecting end and the grounding end, and the electrical length is less than ¼ of a wavelength corresponding to a lowest operating frequency within the operating frequency band; and
wherein the grounding end of the electrostatic protection unit is electrically connected to the grounded metal layer, and wherein a separating distance is between the electrostatic protection unit and the grounded metal layer.
15. The radio frequency device according to claim 14 , wherein the electrical length is greater than 1/40 of the wavelength corresponding to the lowest operating frequency within the operating frequency band.
16. The radio frequency device according to claim 14 , wherein the material of the signal transmission line and the material of the electrostatic protection unit are the same, and a width of the electrostatic protection unit is smaller than a width of the signal transmission line.
17. The radio frequency device according to claim 14 , wherein the electrostatic protection unit includes a transient voltage suppressor element and a grounding line electrically connected to the transient voltage suppressor element, and the transient voltage suppressor element and the grounding line are connected in series with each other.
18. The radio frequency device according to claim 14 , wherein the ¼ of the wavelength corresponding to the lowest operating frequency within the operating frequency band is related to a dielectric coefficient of the carrier board.