Systems for electrostatic discharge protection
In one example, a system includes a radio frequency port coupled to an external connector and a microstrip line coupled to the radio frequency port and one or more components mounted on a printed circuit board. The system further includes a short coupled to the microstrip line and a ground reference, wherein the short is coupled to the microstrip line proximate the radio frequency port.
1. A system, comprising:
a radio frequency port coupled to an external connector;
a microstrip line coupled to the radio frequency port and one or more components mounted on a printed circuit board; and
a short coupled to the microstrip line and a ground reference, wherein the short is coupled to the microstrip line proximate the radio frequency port, wherein the short is configured to have a higher characteristic impedance than the microstrip line, wherein the short is configured to suppress one or more harmonics of an operating frequency for radio frequency signals transmitted or received via the radio frequency port.
2. The system of claim 1 , wherein a length of the short is a quarter wavelength of an operating frequency for radio frequency signals transmitted or received via the radio frequency port.
3. The system of claim 1 , wherein the ground reference comprises a ground pin of the radio frequency port.
4. The system of claim 1 , wherein the short is configured to operate as an open circuit for an operating frequency for radio frequency signals transmitted or received via the radio frequency port.
5. The system of claim 1 , wherein the one or more components mounted on the printed circuit board include at least one of:
a power amplifier; or
a duplexer.
6. The system of claim 1 , wherein the microstrip line includes one or more mitered corners between the radio frequency port and the one or more components mounted on the printed circuit board.
7. The system of claim 1 , wherein the printed circuit board is a multi-layer printed circuit board comprising a plurality of ground vias.
8. A unit of a repeater system, comprising:
downlink circuitry configured to receive downlink signals sourced from a base station and to output a gain-adjusted downlink signal to one or more user equipment in a coverage area of the repeater system;
uplink circuitry configured to receive uplink signals from one or more user equipment in the coverage area of the repeater system and to output a gain-adjusted uplink signal to the base station;
a radio frequency port coupled to an external connector;
a microstrip line coupled to the radio frequency port and the downlink circuitry and/or the uplink circuitry; and
a short coupled to the microstrip line and a ground reference, wherein the short is coupled to the microstrip line proximate the radio frequency port, wherein the short is configured to have a higher characteristic impedance than the microstrip line, wherein the short is configured to suppress one or more harmonics of an operating frequency for radio frequency signals transmitted or received via the radio frequency port.
9. The unit of claim 8 , wherein the unit is a single-node repeater.
10. The unit of claim 8 , wherein the unit is a master unit of a distributed antenna system, wherein the master unit is communicatively coupled to one or more remote antenna units that are located remotely from the master unit.
11. The unit of claim 8 , wherein the unit is a remote antenna unit of a distributed antenna system, wherein the distributed antenna system comprises a master unit communicatively coupled to the remote antenna unit, wherein the remote antenna unit is located remotely from the master unit.
12. The unit of claim 8 , wherein a length of the short is a quarter wavelength of an operating frequency for radio frequency signals transmitted or received via the radio frequency port.
13. The unit of claim 8 , wherein the ground reference comprises a ground pin of the radio frequency port of the unit.
14. The unit of claim 8 , wherein the short is configured to operate as an open circuit for an operating frequency for radio frequency signals transmitted or received via the radio frequency port.
15. The unit of claim 8 , wherein the downlink circuitry and/or the uplink circuitry is mounted on a printed circuit board, wherein the microstrip line includes one or more mitered corners between the radio frequency port and the downlink circuitry and/or uplink circuitry mounted on the printed circuit board.
16. The unit of claim 8 , wherein the downlink circuitry and/or the uplink circuitry is mounted on a printed circuit board, wherein the printed circuit board is a multi-layer printed circuit board comprising a plurality of ground vias.