Reducing rf energy leakage between battery and pcb
AssigneeMotorola Mobility LLC
InventorsKatherine H. Coles, Vijay L. Asrani, David R. Vogel
Life of this patent
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Abstract
An improved system 100 and method of reducing RF energy leakage from being trapped in a gap (cavity) 178 between a battery 102 and printed circuit board (PCB) 104 in an electronic communications device 106 is provided by a RF shield assembly that can extend between the battery and the PCB. The RF shield assembly can comprise a conductive wrap 168 and conductive foam 170 connected to metal pads 138 and 140 along the ground plane 136 of the PCB 104.
Claims20
A system of reducing radio frequency (RF) energy leakage between a battery and printed circuit board (PCB) in an electronic communications device, comprising:
- an electronic communications device having
- at least one antenna;
- a PCB having at least one ground comprising a metal pad;
- a battery pack comprising at least one battery for energizing said PCB and a casing for at least partially enclosing and insulating said battery;
- said battery pack being spaced from said PCB and defining a gap between said battery pack and said PCB;
- and
- a RF shield assembly providing a RF barrier wall extending between and connecting said battery pack and said PCB for substantially minimizing RF energy in said gap from interfering with performance of said antenna.
A system for reducing RF energy leakage between a battery and PCB in an electronic communications device in accordance with claim 4 wherein said spacer is selected from the group consisting of:
- a conductive foam, conductive cushion, resilient spacer, compressible spacer, metal spring, metallic spring contact soldered to said metal pad, conductive tape, conductive elastomeric material, and combinations of any of the preceding.
A system of reducing radio frequency (RF) energy leakage between a battery and printed circuit board (PCB) in an electronic communications device, comprising:
- an electronic communications device, comprising
- at least one internal antenna for emitting and/or receiving RF energy comprising RF signals;
- at least one PCB having at least one metallic ground pad;
- at least one a battery package positioned in proximity to said antenna for powering said PCB and said antenna, said battery package comprising at least one battery and a battery-case for at least partially enclosing and insulating said battery;
- said battery package being spaced from said PCB and defining a gap providing a cavity between said battery package and said PCB;
- and
- a RF shield assembly providing a RF impermeable barrier extending between and connecting said battery package to said metallic ground pad on said PCB for substantially minimizing RF energy in said cavity from interfering with performance of said antenna;
- said RF shield assembly comprising
- a flexible metal conductor connected to said battery package;
- and
- conductive foam comprising at least one conductive spacer positioned between and electrically coupling said flexible metal conductor to said metallic ground pads
A system of reducing radio frequency (RF) energy leakage between a battery and printed circuit board (PCB) in an electronic communications device, comprising:
- an electronic communications device, comprising
- at least one internal RF antenna for receiving and/or transmitting RF signals comprising RF energy;
- at least one PCB having a ground along a ground plane, said ground comprising metallic ground pads, and said PCB positioned in proximity to said RF antenna;
- a battery pack positioned in proximity to and spaced from said antenna for energizing and powering said PCB and said antenna, said battery pack having a generally rectangular battery providing a battery cell with longitudinal edges and lateral edges extending between and connected to said longitudinal edges, said battery pack having a plastic casing comprising an insulating wrapper providing a electrically insulating liner positioned about, encasing and insulating said battery, and said battery pack having a finger graspable plastic pull tab secured to said casing for assisting in pulling and removing said battery pack from said electronic communications device;
- a gap providing a cavity spaced between said battery and said PCB, said cavity defining openings providing end openings comprising open ends positioned in proximity to said lateral edges and providing side openings comprising open sides positioned in proximity to said longitudinal edges;
- and
- a RF shield assembly providing a RF impermeable barrier extending between and connecting said pull tab to said metallic ground pad on said PCB for substantially minimizing RF energy from being trapped in said cavity to substantially minimize cavity resonances at undesired frequencies and substantially minimize degradation of antenna performance;
- said RF shield assembly comprising
- a conductive wrap comprising a flexible metal conductor connected to said pull tab;
- and
- a conductive spacer comprising compressible conductive foam positioned between and electrically connecting said flexible metal conductor to at least one of said metallic ground pads.
Dependencies are inferred from the claim text.