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January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area NProject: IEEE P802.15 Working Group for Wireless Personal Area Networks etworks (WPANs)(WPANs)
Submission Title: [The Effect of Human Body on UWB BAN Antenna]Date Submitted: [January, 2007]Source: [Kamya Yekeh Yazdandoost, Ryuji Kohno] Company: [National Institute of Information and Communications Technology
(NICT)]Contact: Kamya Yekeh YazdandoostVoice: [+81 46 847 5435], Fax: [+81 46 847 5431] E-Mail: [[email protected]]Abstract: [Discussions on the Effect of Human Body on UWB BAN ANTENNA]Purpose: [To provide an introduction of the Effect of Human Body on UWB BAN
ANTENNA]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.
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 2
Kamya Yekeh Yazdandoost, Ryuji Kohno
National Institute of Information and Communications Technology (NICT)
THE EFFECT OF HUMAN BODY ON UWB BAN ANTENNA
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 3
Outline
UWB Antenna in Free Space UWB Antenna on Direct Contact with Human BodyUWB Antenna on Direct Contact with Human Body with 2nd Substrate Conclusion
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 4
Antenna in Free Space
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 5
Aim of Design
Low Cost,Simple Structure & Small Size
Frequency Operation3.1-5.1 (GHz),
Lower Band of UWB Frequency
BW = 2 (GHz)VSWR ≤ 2
Omni-Directional PatternSatisfactory Gain
Liner Phase
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 6
Developed Antenna
Substrate
Metallic Layer
Side view of the antenna Structure
Top view of the antenna structure
25 mm
34 mm1 m
m
Substrate: FR4 (εr = 4.4 )Metal: Copper (t = 18 um)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 7
Feed LineThe antenna is fed through a couple tapered transmission line. The tapered transmission lines have shown good impedance matching over a wide frequency range.The geometry of the taper is chosen to minimize the reflection and optimize impedance matching and bandwidth.
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 8
Prototype
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 9
Results (Free Space)Return Loss
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 10
Impulse Response (Receive Signal)Results (Free Space)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 11
Results (Free Space)Return Loss
Frequency (GHz)
S11
(dB
)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 12
Results (Free Space)
Frequency (GHz)
PhasePh
ase
(deg
)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 13
Results (Free Space)Gain
Gai
n (d
Bi)
Frequency (GHz)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 14
Results (Free Space)Radiation Pattern (dBi) at 3.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 15
Results (Free Space)Radiation Pattern (dBi) at 4.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 16
Results (Free Space)Radiation Pattern (dBi) at 5.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 17
Results (Free Space)Radiation Pattern (dBi) at 3.1 GHz
+ + + Eθ E φ
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 18
Results (Free Space)Radiation Pattern (dBi) at 4.1 GHz
+ + + Eθ E φ
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 19
Results (Free Space)Radiation Pattern (dBi) at 5.1 GHz
+ + + Eθ E φ
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 20
Results (Free Space)3D Radiation Pattern
z
x
yθ
φ
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 21
Antenna on Direct Contact with Human Body
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 22
Direct Contact of the Antenna Substrate with Skin
A part of human chest wall used in electromagnetic simulation
AntennaFR4
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 23
Results (On Body, Direct Contact)Return Loss
Frequency (GHz)
S11
(dB
)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 24
Results (On Body, Direct Contact)Phase
Frequency (GHz)
Phas
e (d
eg)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 25
Results (On Body Direct Contact)Gain
Frequency (GHz)
Gai
n (d
Bi)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 26
Results (On Body, Direct Contact)Radiation Pattern (dBi) at 3.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 27
Results (On Body, Direct Contact)Radiation Pattern (dBi) at 4.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 28
Results (On Body, Direct Contact)Radiation Pattern (dBi) at 5.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 29
Results (On Body, Direct Contact)3D Radiation Pattern
z
x
yθ
φ
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 30
Antenna on Direct Contact with Human Body with 2nd
Substrate
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 31
Direct Contact of the Antenna Substrate with Skin
A part of human chest wall used in electromagnetic simulation
AntennaAntenna
RH-5FR4
2nd Substrate: RH-5
t = 14 mm ,εr=1.09
tanθ=0.0004
http://www.cumingcorp.com
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 32
Results (Direct Contact, 2nd Substrate)Return Loss
Frequency (GHz)
S11
(dB
)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 33
Results (Direct Contact, 2nd Substrate)Phase
Phas
e (d
eg)
Frequency (GHz)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 34
Results (Direct Contact, 2nd Substrate)
Frequency (GHz)
Gain G
ain
(dB
i)
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 35
Results (Direct Contact, 2nd Substrate)Radiation Pattern (dBi) at 3.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 36
Results (Direct Contact, 2nd Substrate)Radiation Pattern (dBi) at 4.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 37
Results (Direct Contact, 2nd Substrate)Radiation Pattern (dBi) at 5.1 GHz
y-z plane x-z plane x-y plane
φ= 0 φ= 90
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 38
Results (Direct Contact, 2nd Substrate)3D Radiation Pattern
z
x
yθ
φ
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 39
ConclusionA study on the affects of human body on wearable UWB antenna has been
performed.
The antenna designed to operate in a lower band of UWB frequency from 3.1 to 5.1 GHz.
The antenna performance in a free space, close to the human body and same antenna with second substrate layer close to the human body presented.
We have shown that, the body absorbs a significant amount of the output power and changes the antenna characteristics, when an antenna placed on the surface of human body. Therefore destructively affects the performance of the system.
Particularly, the human body affected the radiation pattern of antenna and it has become directional.
Also, we presented that, adding second substrate layer can improve the antenna performance close to the body. However, the antenna radiation patterns remained directional.
January, 2007 Doc: IEEE 802.15-07-0546-00-0ban
Yazdandoost, KohnoSlide 40