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Appendix: Proximity sensor Power reduction information

In this section, the following list is used to prepare an inquiry seeking SAR test

guidance for proximity sensor power reduction. The procedures in KDB 616217 is

applied for SAR testing.

1 General proximity sensor implementation

description

This device uses a proximity sensor that share the same metallic electrode as the

transmitting antenna to facilitate triggering in typical user interactivity with the device.

Due to the operating configurations and exposure conditions required by the device,

the proximity sensor is used to indicate when the phone is held close to a user’s body

exposure condition. It utilizes the proximity sensor to reduce the output power in

specific wireless and operating modes to ensure SAR compliance for the following

scenarios: To reduce the output power of main antennas during body close to phone.

2 Antennas and sensor placement details

1） Antenna-to-antenna/user separation distances

Summary of content (10 pages)

PAGE 1
Appendix: Proximity sensor Power reduction information In this section, the following list is used to prepare an inquiry seeking SAR test guidance for proximity sensor power reduction. The procedures in KDB 616217 is applied for SAR testing. 1 General proximity sensor implementation description This device uses a proximity sensor that share the same metallic electrode as the transmitting antenna to facilitate triggering in typical user interactivity with the device.
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Figue1: The location of the antennas and proximity sensor Note: The Div Antenna and GPS Antenna does not have the transmit function. The proximity sensor and main antenna use same metallic electrode ,so the location is same.
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Antenna/Sensor-to- DUT sides separation distances Back Tx Antenna Front side Bottom Left side Right side Top side side side Main 2G&3G&4G 2.15mm 1mm 9.5mm 11.2mm 139mm 1.0mm 2.4G WiFi Antenna 2.15mm 1mm 46.5mm 4.5mm 2.5mm 139mm sensor 2.15mm 1mm 9.5mm 11.2mm 139mm 1.
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Description of proximity sensor Techniques The proximity sensor is triggered by capacitance changes due to objects in the vicinity of the sensing element. Capacitive proximity sensor sharea metallic electrode with the GSM、WCDMA and LTE antenna radiator. The metallic electrode and sar sensor chip works as a sensor. As is shown in Figure 2. The proximity sensor or the power reduction cannot be intentionally or unintentionally turned-off by the user.
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Back side Front side Left side Right side Bottom side Extremity SAR(Bottom/Front/Back/Left) Top side Back side WCDMA B2 Front side Left side Right side Bottom side 0
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28mm 28mm
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Picture: Proximity sensor triggering distances assessment (Back side) Table: Summary of Trigger Distances Liquid Trigger distance Trigger distance – Trigger distance – Front side back side – bottom side Moving Moving Moving Moving Moving Moving toward from toward from toward from phantom phantom phantom phantom phantom phantom 1900 18mm 18mm 26mm 26mm 28mm 28mm 1900 18mm 18mm 26mm 26mm 28mm 28mm 1900 18mm 18mm 26mm 26mm 28mm 28mm 2550 18mm 18mm 26mm 26mm
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4.2 Procedures for determining antenna and proximity sensor coverage (Per KDB616217 §6.3) The proximity sensor and main antenna use same metallic electrode, so there is no spatial offset. 4.3 Procedures for determining device tilt angle influences to proximity sensor triggering (Per KDB616217 §6.4) Per FCC KDB 616217 D04v01, the DUT was positioned directly below the flat phantom at the minimum measured trigger distance with each applicable top parallel to the base of the flat phantom for each band.
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Table: Summary of Phone Tilt Angle Influence to Proximity Sensor Triggering Minimum trigger Band(MHz) Minimum trigger distance at which distance Per power reduction KDB616217§6.
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