IEEE 802.15 subject

1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
TaiyoYuden/TRDA Small Form Factor Ceramic
Antenna for Low Rate alt-PHY Date Submitted 4
January, 2005 Source Hironori Okado(1), Mick
Aoki(2) Company (1)Taiyo Yuden Co.,Ltd.,
(2)TRDA Inc. Address (1)8-1 Sakaecho Takasaki-
shi Gunma 370-8522 Japan, (2)10180 Telesis Court
Suite120, San Diego, CA 92121 Voice
(1)81-27-324-2311, (2)1-858-554-0755
Fax[phone]
E-mail (1)h-okado_at_jty.yuden.co.jp,
(2)maoki_at_trda-inc.com Re Abstract This
presentation is introduction to small form factor
ceramic antenna for low rate alt-PHY. Purpose P
roposing a RF front-end for standardization by
802.15.4a . Notice This document has been
prepared to assist the IEEE P802.15. It is
offered as a basis for discussion and is not
binding on the contributing individual(s) or
organization(s). The material in this document is
subject to change in form and content after
further study. The contributor(s) reserve(s) the
right to add, amend or withdraw material
contained herein. Release The contributor
acknowledges and accepts that this contribution
becomes the property of IEEE and may be made
publicly available by P802.15.
2
Taiyo Yuden / TRDASmall Form Factor Ceramic
Antenna for Low Rate alt-PHY

• Hironori Okado
• Taiyo Yuden Co.,Ltd.
• Mick Aoki
• TRDA Inc. (Taiyo Yuden RD Center of America)

3
Contents

• Requirement for RF Front-end
• Antenna performance
• Filter performance
• Conclusion

4
Contents

• Requirement for RF Front-end
• Antenna performance
• Filter performance
• Conclusion

5
Technical requirements for 802.15.4a

• Bit rate 1kb/s to 1Mb/s
• Range 30m
• Interference mitigation
• Low power
• Location awareness
• Regulatory matters
• UWB is well suited to 802.15.4a

6
Structure of 802.15.4a UWB Radio
PHY
Antenna
RF BB Chip
MAC Chip
BPF
BEF
Balun
RF Front End
7
UWB Band and Other Wireless Standards
Cordless phone Microwave Oven 802.15.1/3/4 802.11b
/g
Cordless phone 802.11a
Cell phone
2400
4900
5835
2500
MHz
MHz
MHz
MHz
UWB
UWB
f
3.1GHz
10.6GHz
4.9GHz
5.835GHz
1st generation UWB will use below 802.11a
band 2nd generation UWB needs to consider
interference from/to 802.11a
8
Requirements for Antenna

• Non-Directional
• Small Form Factor as SD Memory Card
• Robust
• High Gain

TG4a Technical Requirement (Doc IEEE
15-04-0198-02-004a) P802.15.4a Alt PHY Selection
Criteria (Doc IEEE 15-04-0232-16-004a)
9
Requirements for Filter

• High Attenuation for Interferences
• - WLANs (2.4 and 5GHz)
• - WPANs (802.15.1, 802.15.3, 802.15.4)
• - Cordless phones (2.4GHz and 5.8GHz)
• - Cellular phones
• - Microwave ovens
• Low Insertion Loss
• Small Form Factor

TG4a Technical Requirement (Doc IEEE
15-04-0198-02-004a) P802.15.4a Alt PHY Selection
Criteria (Doc IEEE 15-04-0232-16-004a)
10
Contents

• Requirement for RF Front-end
• Antenna performance
• Filter performance
• Conclusion

11
Definition of Antenna Gain
Ideal Radiation Pattern of Non-Directional
Antenna (Isotropic Radiation)
How to increase gain?
Total radiation energy for total polarization
radiation
a(dB) ? Specific Direction Becomes Big
Theoretical limit at zero-loss condition
-a(dB) ? Other Direction Becomes Weak
The Theoretical Maximum Gain for Non-directional
Antenna is 0dBi
12
Developed Antenna

• Ceramic Antenna is Small.
• - Element Size 8 x 6 x 1 mm
• - Ground Size 20 x 25 mm (Antenna A)
• (Size of SD memory 24 x 32 mm)
• Designed for RF tag application
• ICs and components can be mounted on board.
  Antenna needs at least one ground plane.

13
Measurement System
Antenna Efficiency and Radiation Pattern
Measured by multi-probe antenna measurement
system
14
Element Location (1)
Antenna A
Edge
Center
15
Element Location (2)
Edge
Center
16
Influence of Side Ground
Antenna A
VSWR is degraded by Antenna side ground.
17
VSWR (1)
Antenna A
Antenna B
18
VSWR (2)
Antenna C
Antenna D
19
Efficiency (1)
2.4GHz Band
78dB Attenuation
20
Radiation Pattern (1)
Antenna A
21
Radiation Pattern (2)
Antenna B
22
Radiation Pattern (3)
Antenna C
23
Radiation Pattern (4)
Antenna D
24
Group Delay
Sample Antenna A
25
Impulse Response (1)
Transmitted Signal at input of Double Ridge Horn
Antenna 500ps/Div 10mV/Div
26
Impulse Response (2)
Received Signal by Antenna A 500ps/Div 10mV/Div
Received Signal by Antenna B 500ps/Div 10mV/Div
27
Impulse Response (3)
Received Signal by Antenna C 500ps/Div 10mV/Div
Received Signal by Antenna D 500ps/Div 10mV/Div
28
Contents

• Requirement for RF Front-end
• Antenna performance
• Filter performance
• Conclusion

29
Developed Filter

• Ceramic Filter is Small and Robust
• Band Pass Filter for 1st generation
• Band Elimination Filter against 5GHz band
• Performance
• -Low Insertion loss
• -High Attenuation
• Chips need Balun

30
Band Pass Filter (BPF)
Dimension 3.2 x 1.6 x 1.15 mm
For 1st generation chip set
31
Band Elimination Filter (BEF)
Dimension 6.3 x 3.0 x 1.1 mm
32
Balun
Dimension 2.0 x 1.25 x 0.9 mm
Dimension 3.5 x 2.5 x 0.85 mm
33
Contents

• Requirement for RF Front-end
• Antenna performance
• Filter performance
• Conclusion

34
Conclusion

• Proposed UWB Antenna meets requirements.
• - Non-directional, Small, Robust, High Gain
• - Flat Group Delay, Good Impulse Response
• The Antenna Element can be used in the corner of
  RF tag or module. ICs and components can be
  mounted on board. There is less wasted space.
• Proposed Filter has enough performance to avoid
  interference.
• Accelerate Time to Market. The Antenna and
  Filters are Available Now.