Radial fin heat sink for remote radio heads and the like
地域：
NC
NC Hickory
摘要
In one embodiment, an apparatus includes three remote radio heads (RRHs) mounted on a pole using one or more triangular brackets, each RRH connected to a corresponding antenna. Each RRH includes an electronics module, a heat sink mounted on the electronics module, and a cover attached to the heat sink. The heat sink comprises a base, a plurality of attached forward-facing fins, and a pair of backward-facing fins. Each forward-facing fin and backward-facing fin comprises a proximal end attached to the base and an opposite distal end. The proximal ends of the plurality of forward-facing fins are collinear. The distal ends of the plurality of forward-facing fins and the backward-facing fins define an arc of an ellipse.
說明書
This application claims the benefit of the filing date of U.S. Provisional Application No. 62/045,097 filed on Sep. 3, 2014, the teachings of which are incorporated herein by reference in their entirety.
The current disclosure relates to wireless transceivers and particularly, but not exclusively, to heat sinks for radio-frequency (RF) transceivers in cellular networks.
A remote radio head (RRH) is a radio-frequency transceiver used in cellular networks to extend the network's reach. An RRH is typically mounted on a structure, tower, or pole proximate to a corresponding, similarly mounted antenna. The RRH is communicatively connected to (i) a cellular-network base band unit (BBU)—via, e.g., fiber-optic cables—and (ii) the corresponding antenna—via, e.g., coaxial cables. The placement of the RRH close to the antenna reduces power lost through signal transmission over coaxial cables—particularly in comparison with legacy systems that do not use an RRH and have the antenna connected to remotely located radios via coaxial cables.
The RRH comprises active electronic circuits such as power amplifiers for amplifying transmit and receive signals. The power amplifiers in the RRH generate significant amounts of heat which needs to be dissipated to prevent damage to the power amplifiers and/or other components of the RRH.
權(quán)利要求
We claim:1. An apparatus comprising a heat sink for an electronics module, wherein:the heat sink comprises a base, a plurality of forward-facing fins, and a plurality of backward-facing fins; a first side of the base is substantially planar and adapted for mounting to the electronics module; each forward-facing fin comprises (i) a proximal end attached to a second side of the base and (ii) an opposite distal end; each backward-facing fin comprises (i) a proximal end attached to the second side of base and (ii) an opposite distal end; the proximal ends of the plurality of forward-facing fins are collinear; and the distal ends of the plurality of forward-facing fins define an arc of an ellipse; the distal ends of the plurality of backward-facing fins define extensions of the arc of the ellipse defined by the plurality of forward-facing fins; wherein the second side of the base is substantially planar and parallel to the first side; wherein each of the forward-facing fins is not parallel with at least one immediately adjacent forward-facing fin; wherein a first forward-facing fin of the plurality of forward-facing fins is located farther from a center line of the first side of the base than a second forward-facing fin of the plurality of forward-facing fins, wherein the first forward-facing fin has a greater angle measurement between the first forward-facing fin and a line perpendicular to the first side of the base than the second forward-facing fin and the line perpendicular to the first side of the base; and wherein the first forward-facing fin of the plurality of forward-facing fins has a shorter length, measured from the proximal end of the first forward-facing fin to the distal end of the first forward-facing fin, than a length of the second forward-facing fin, measured from the proximal end of the second forward-facing fin to the distal end of the second forward-facing fin. 2. The apparatus of claim 1 , wherein the ellipse is a circle. 3. The apparatus of claim 2 , wherein a measure of the arc is between 90 and 120 degrees. 4. An apparatus comprising a heat sink for an electronics module, wherein:the heat sink comprises a base and a plurality of forward-facing fins and a plurality of backward-facing fins; a first side of the base is substantially planar and adapted for mounting to the electronics module; each forward-facing fin comprises (i) a proximal end attached to a substantially planar second side of the base and (ii) an opposite distal end; each backward-facing fin comprises (i) a proximal end attached to the second side of base and (ii) an opposite distal end; the proximal ends of the plurality of forward-facing fins are collinear, the distal ends of the plurality of forward-facing fins define an arc of an ellipse; and the first side of the base and the second side of the base are parallel; the apparatus further comprising a cover, wherein: the cover comprises a plate having a curvature and adapted to fit over the heat sink, the cover further comprising at least one of a plurality of hooks and/or a plurality of a plurality of bayonets; the curvature of the cover corresponds to the are defined by the distal ends of the plurality of forward-facing fins; the backward-facing fins comprise a plurality of apertures corresponding to the plurality of hooks and/or the plurality of bayonets and adapted to receive the plurality of hooks and/or the plurality of bayonets; and the cover is removably attached over the heat sink. 5. The apparatus of claim 4 , wherein the cover comprises both hooks and bayonets. 6. The apparatus of claim 1 , wherein:the apparatus comprises the electronics module; the first side of the heat sink is mounted to the electronics module; the apparatus further comprises a cover; the cover comprises a plate having a curvature and adapted to fit over the heat sink; the curvature of the cover corresponds to the arc defined by the distal ends of the plurality of forward-facing fins; the cover is removably attached over the heat sink; and the ellipse is a circle. 7. The apparatus of claim 6 , wherein:the electronics module, heat sink, and cover form a remote radio head (RRH) sub-assembly; and the apparatus further comprises a bracket adapted to mount the RRH sub-assembly to a pole. 8. The apparatus of claim 7 , wherein the bracket is further adapted to mount two additional instances of the RRH sub-assembly to the pole, such that the three covers form an open segmented circular cylinder. 9. A remote radio head subassembly, comprising:an electronics module comprising one or more input/output ports for connecting the remote radio head subassembly to a base band unit and/or an antenna; a heat sink comprising a base, a plurality of forward-facing fins, and a plurality of backward-facing fins; a first substantially planar-side of the base mounted to the electronics module; each forward-facing fin comprising (i) a proximal end attached to a second substantially planar side of the base and (ii) an opposite distal end; each backward-facing fin comprising (i) a proximal end attached to the second side of base and (ii) an opposite distal end; the proximal ends of the plurality of forward-facing fins being collinear; each of the forward-facing fins is not parallel with at least one immediately adjacent forward-facing fin; the distal ends of the plurality of forward-facing fins defining an arc of an ellipse; and the distal ends of the plurality of backward-facing fins defining extensions of the are of the ellipse. 10. A plurality of remote radio head subassemblies as defined in claim 9 mounted to a pole to form a cylindrical remote radio head.
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