ELECTRONIC EQUIPMENT CABINETS HAVING RADIO FREQUENCY RELAYS
Electronic equipment cabinets include a relay that has an internal antenna, an external antenna and a transmission path therebetween. The internal antenna is located at least partially within the cabinet and the external antenna is located at least partially exterior to a wall of the cabinet. The relay is configured to receive uplink wireless transmissions from the wireless Internet-of-Things transceivers included on electronic devices mounted within the cabinet and to forward and rebroadcast these uplink wireless transmission to the exterior of the cabinet via the external antenna.
1 . An electronic equipment cabinet, comprising:
a cabinet having a plurality of walls including at least a rear wall, two side walls and a top wall;
a plurality of electronic devices, each electronic device located within the cabinet and at least some of the electronic devices including a respective wireless transceiver; and
a relay comprising an internal antenna, an external antenna and a transmission path therebetween, wherein the internal antenna is located at least partially within the cabinet and the external antenna is located at least partially exterior to a wall of the cabinet, and wherein the relay is configured to receive uplink wireless transmissions from the wireless transceivers of the electronic devices and to forward and rebroadcast these uplink wireless transmission to the exterior of the cabinet via the external antenna.
2 . The electronic equipment cabinet of claim 1 , wherein the relay is further configured to receive, via the external antenna, a downlink wireless transmission destined for a first of the electronic devices and to forward and rebroadcast the downlink wireless transmission to the first electronic device via the internal antenna.
3 . The electronic equipment cabinet of claim 1 , wherein the relay comprises a board with an RF transmission line thereon.
4 . The electronic equipment cabinet of claim 3 , wherein at least one of the internal antenna and the external antenna is mounted on the board.
5 . The electronic equipment cabinet of claim 4 , wherein the internal antenna comprises a monopole antenna and the external antenna comprises a monopole antenna.
6 . The electronic equipment cabinet of claim 1 , wherein the relay further comprises an amplifier that amplifies signals received by the internal antenna.
7 . The electronic equipment cabinet of claim 1 , wherein the transmission path comprises a coaxial cable.
8 . The electronic equipment cabinet of claim 7 , wherein a first end of the center conductor of the coaxial cable comprises part of the internal antenna, and a second end of the center conductor of the coaxial cable comprises part of the external antenna.
9 . The electronic equipment cabinet of claim 7 , wherein the transmission path comprises an RF transmission line that directly connects the internal and external antennas.
10 . The electronic equipment cabinet of claim 7 , wherein the relay includes at least one sensor.
11 . The electronic equipment cabinet of claim 1 , wherein the external antenna is located remotely from the cabinet.
12 . The electronic equipment cabinet of claim 11 , wherein the cabinet is located underground and the external antenna is above ground.
13 . The electronic equipment cabinet of claim 1 , further comprising an internal RFID antenna, an external RFID antenna, and an RFID transmission line connecting the internal RFID antenna to the external RFID antenna.
14 . A method comprising:
receiving at an internal antenna of a relay a radio frequency (“RF”) signal transmitted by an electronic device that is mounted within a metal cabinet, wherein the internal antenna is at least partially within the metal cabinet; and
forwarding the received RF signal to an external antenna that transmits the received RF signal externally to the metal cabinet.
15 . The method of claim 14 , wherein the RF signal is within a first frequency band, and wherein the forwarding comprises transmitting the RF signal without converting the RF signal to a different frequency band.
16 . The method of claim 14 , further comprising amplifying the received RF signal prior to transmitting the received RF signal externally to the metal cabinet.
17 . A relay comprising:
an internal antenna,
an external antenna,
a transmission path between the internal antenna and the external antenna, wherein the internal antenna is dimensioned to sit at least partially within an electronics cabinet and the external antenna is dimensioned to sit at least partially exterior to a wall of the electronics cabinet.
18 . The relay of claim 17 , wherein the transmission path comprises a coaxial cable.
19 . The relay of claim 17 , further comprising:
a pair of diplexers,
a pair of amplifiers; and
a voltage regulator.
20 . The relay of claim 17 , wherein at least one of the internal antenna and the external antenna comprises an RFID antenna.