Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS)

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANS)
Submission Title Wideband Antenna with Dual
Frequency for UWB System Date Submitted March
2004 Source Yuko Rikuta, Ryuji Kohno Company
Communications Research Laboratory (CRL)
Connectors Address 3-4, Hikarino-oka,
Yokusuka, 239-0847, Japan Voice
81-46-847-5086, FAX [phone]
E-mail rikuta_at_crl.go.jp, kohno_at_crl.go.jp Re
IEEE P802.15 Alternative PHY Call for Proposals,
IEEE P802.15-02/327r7 Abstract This
presentation is Introduction to the Wideband
Antenna with Dual Frequency for UWB system. This
novel monopole antenna consists of two connected
planar elements. Purpose Wideband Antenna with
Dual Frequency for 802.15.TG3a 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.
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Wideband Antenna with Dual Frequency for UWB
System
Yuko Rikuta Ryuji Kohno Communications
Research Laboratory, Japan

• Background
• Planar monopole antenna
• Geometry of analysis antenna model
• Antenna characteristics
• Conclusion

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Background (1)
UWB Antennas (3D) -Double Ridged Guided Horn
Antenna -Log periodic Antenna -Monocone-like
Antenna etc.
UWB Antennas (2D) -Fractal Antenna -Vivaldi
Antenna -Planar Dipole Antenna etc.
DRGHA
These antennas are covering 3.110.6GHz for UWB
System.
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Background (2)
Ultra Wideband Antenna for UWB System
Single-band
Multi-band
Dual- or Triple-band
UWB antenna can be applied to any band
segmentations, such as single-, dual- and
multi-bands.
Need to suppress the interference where other
systems exists
Ultra Wideband system covers the frequency bands
of 3.110.6GHz.
Wideband antenna and dual frequency
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Background (3)
To operate two frequencies by using two antennas
makes the size of antenna installation larger.
Reducing the size is necessary.
Antennas with dual frequency -radiation element
parasitic element -two-layered top loaded
monopole antenna etc.
These antennas are suitable for two narrowband
applications.
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Background (4)
Requirement for Ultra-wideband antenna

• Small size
• Easy for fabrication
• Return Loss characteristics RLlt-10dB
• VSWR characteristics VSWRlt3
• Radiation pattern omni directional pattern
• Gain characteristics Gaingt2dBi

Divides UWB frequency band into 2 sub-bands

• Antenna with dual frequency
• Broadband characteristics

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Planar Monopole Antenna
W
H20mm
g
12
Bandwidths of each resonant frequency are changed
by the antenna width.
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Radiation pattern of planar monopole
ltxy planegt
ltzx planegt
Omni-directional pattern in horizontal plane can
be obtained.
( H20mm, W12mm ) 3.046.54GHz
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Monopole Antenna with Dual Frequency
W
Upper Rectangle element (connected with
lower) Lower Rectangle element (Planar
monopole antenna)
Hu
z
Cell size Dx,y1mm Dz0.5mm
Hl
Iteration steps 5000
ABC PML 8 layer
g
InputGaussian Pulse
Feed
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Planar monopole and novel planar monopole
(a) Novel Planar Monopole
(b) Planar Monopole
Resonant frequency is divided to two resonant
frequencies by adding slit to planar monopole.
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Current distribution per antenna structure
0
-5
-10
dB
dB
ltplanar monopolegt
ltmonopolegt
-15
Return Loss dB
-20
monopole
planar
-25
novel planar
-30
2
4
6
8
10
12
dB
dB
ltlower frequencygt
lthigher frequencygt
Frequency GHz
novel planar monopole
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Return Loss characteristics of example antenna
W
Hu
z
Hl
g
Wide bandwidth with dual frequency can be
achieved. Return Loss level is almost 0dB at
around 56GHz.
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Radiation Pattern (xy) of example antenna

• omni-directional pattern
• Gain 2.2-5.2dBi

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Radiation Pattern (yz) of example antenna
omni-directional pattern in horizontal plane
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Radiation Pattern (zx) of example antenna
omni-directional pattern in horizontal plane
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Conclusion
Planar monopole antenna with dual
frequency upper rectangle element lower
planar rectangular monopole antenna

• Proposed antenna has dual frequency with wide
  bandwidth.

• The return loss level at the eliminated
  frequency between
• both resonances is almost 0 dB.

• Radiation pattern is omni-directional in
  horizontal plane.