Presentation Title

Ian Wu (吳俊儀)

Antenna report

NTT Sonority Inc. MBH001 Wireless on-ear speakers 2A58O-MBH001 2A58OMBH001 mbh001

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Shrui RF DVT Antenna report
0229, 2024

Pictures of Antenna placement
Chip Antenna
 Antenna position : place on the PCBA main board.  Chip antenna dimension : 3 mm* 1.6 mm  Clearance area : 7 mm * 15 mm (1052)
Chip antenna
2

Measurement Photo
Free space

On head
3

S11 Return Loss for BT after tuning

 BT return loss > 5 dB after tuning

Free space

On head

4

3 Views of Antenna
5

BT 2D Radiation Patterns in Free space

Head
Frequency (MHz)
2400

ZS plane

Max Value (dB)

Average (dB)

-0.77

-6.32

ZY plane

Max Value (dB)

Average (dB)

-4.99

-9.63

XY plane

Max Value (dB)

Average (dB)

-0.63

-4.94

2450

-0.04

-6.34

-5.05

-10.51

0.07

-4.90

2500

-2.77

-9.30

-8.39

-13.02

-2.70

-7.41

6

3 Views of Antenna
7

BT 2D Radiation Patterns on Head

Head
Frequency (MHz)
2400

ZS plane

Max Value (dB)

Average (dB)

-1.47

-8.29

ZY plane

Max Value (dB)

Average (dB)

-8.13

-11.06

XY plane

Max Value (dB)

Average (dB)

-0.97

-6.28

2450

-1.21

-7.85

-7.42

-11.09

-0.73

-5.74

2500

-3.52

-9.98

-9.53

-12.97

-3.65

-8.13

8

Antenna performance summary

Antenna Performance Return loss : > 5dB Efficiency : 21% DUT and 16% DUT on head. Peakgain : 0.1~-1.5dBi

Return loss (dB) Efficiency(%)
Peak gain(dBi)

Band
2.4G 2.4G 2.45G 2.48G 2.4G 2.45G 2.48G

DVT

Free space

Head phantom

> 5

> 5

> 21.8

> 15.2

> 21.2

> 16.8

> 20.3

> 15.5

< -0.6

< -0.9

< 0.1

< -0.7

< -0.9

< -1.5

9

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