presentation - advanced planar antenna designs for wireless...
TRANSCRIPT
![Page 1: Presentation - Advanced Planar Antenna Designs for Wireless …hibp.ecse.rpi.edu/~connor/education/Antennas/NSYSU2.pdf · 2006-05-20 · NSYSU, Taiwan 3 Introduction (2) nSome Promising](https://reader033.vdocuments.net/reader033/viewer/2022050603/5fab296b289cf504e42837f6/html5/thumbnails/1.jpg)
2003-11 Ansoft Workshop
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Advanced Planar Antenna Designs for Wireless Devices
翁金輅 (Kin-Lu Wong)國立中山大學電機系
Dept. of Electrical Engineering National Sun Yat-Sen University
Kaohsiung 80424, TaiwanE-mail: [email protected]
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Introduction (1)
n Wireless Communication devicesn Cellular phones (bar type, folder type) n Laptops or Tablet PCsn Personal digital assistants (PDAs)n WLAN in-building access points (on-ceiling,
on-wall, or-desk)
n Operating bandsn AMPS, GSM, DCS, PCS, UMTS, etc. (850, 900,
1800, 1900, 2050 MHz bands, etc.)n WLAN band (2.4, 5.2, 5.8 GHz)n Ultra-wide band (3.1~10.6 GHz)
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Introduction (2)
n Some Promising planar antenna typesn Planar inverted-F antennas (PIFAs) n Very-low-profile monopoles (bent, folded)n Printed monopole/dipole antennasn Metal-plate antennas (constructed using
line-cutting or stamping) n Slot antennas (stamped from metal or
integrated with system ground plane)n folded dipole antennan Ceramic chip antennas (SMT devices)
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Conventional PIFAs
n Conventional PIFAs comprise: a top patch, a shorting pin, and a feeding pin.
The top patch is mounted above a ground plane;
The shorting pin and feeding pin, connected at proper positions to the top patch, have the same length as the distance between the top patch and the ground plane
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Some dual-frequency top patches for PIFAs
These top patches are mainly printed on a thin dielectric substrate, and then supported above a ground plane
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PIFA- Folded top patch, stamped from a metal plate
Patch stamped from a single metal plate;
Then folded and attached to two sides of a dielectric slab
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PIFA- PIFA printed on an FPCB
Patent pending
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PIFA- PIFA printed on an FPCB
BW (2.5:1 VSWR) covers the GSM and DCS bands;
Gain about 0.5-1.4 dBi for GSM band,
and about 1.3-3.2 dBi for DCS band
Length of the meandered radiating arm is ~ 95 mm, about 0.25λ at 900 MHz
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Very-Low-Profile Monopole 1-Planar monopole with slitsn Inner sub-patch resonates at 0.25λ for upper band;
outer sub-patch at 0.25 and 0.5λ for lower and upper bands
TW Patent Pub 523963
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Very-Low-Profile Monopole 2-Planar spiral monopole
n Placing monopole in perpendicular to the circuit board
Monopole size 7 x 30 mm2;
7 mm to the system ground;
Covering GSM/DCS/PCS bandsTW Patent 171088
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Very-Low-Profile Monopole 3-for folder-type handset (1)
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Antenna printed on two sides of a dielectric substrate; BW (2:1 VSWR) covers the GSM/DCS/PCS bands
Gain level about 1 dBi for GSM band,
and about 2 dBi for DCS/PCS bands
Very-Low-Profile Monopole 3-for folder-type handset (2)
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Ground plane (length) effect on antenna performance
Small(~ 5%)
Large(> 15%)
Large(> 15%)
Effect on fr
largelargePIFA
largelargeShorted monopole
largelargeMonopole
Effect on pattern
Effect on BW
1. GP length varies from 40~200 mm (0.25~1.25λ), f = 1800 MHz (λ~160 mm)
2. For PIFA, max BW occurs when GP length ~ 0.35λ (60 mm), 0.85λ (140 mm), 1.35λ (220 mm)
3. Period of null currents on GP is ~ 0.5λ (80 mm)
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Simulated Surface Current Distributions Using Ansoft HFSS
Dark regions indicate null currents and are spaced about 0.5λ
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Radiation patterns dominated by the ground-plane length
L = 40 mm case shows a 0.5λdipole-like pattern
Simulated Radiation Patterns Using HFSS
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L = 200 mm case shows 1.5λ dipole-like patterns
Simulated Radiation Patterns Using HFSS
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For WLAN mobile units-Surface-mount antenna
n Regular patch antennas (ceramic chip as a substrate)
n Monopoles (ceramic chip as a support for the monopole)
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SMA- Ceramic Chip Antenna (1)
CP Design
US Patent 6140968
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CP Design, dual side-feed, feed at A for RHCP, feed at B for LHCP; Gain level about 3.0 dBic (test board 50 mm x 50 mm) for GPS operation at 1575 GHz
TW Patent 171997
SMA- Ceramic Chip Antenna (2.1)
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CP Design, dual side-feed ceramic chip antenna
TW Patent 171997
SMA- Ceramic Chip Antenna (2.2)
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SMA- Ceramic Chip Antenna (2.3) 3D Model in Ansoft HFSS
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SMA- Ceramic Chip Antenna (2.4)Current Plot
Ansoft HFSS simulation results
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Helix monopole embedded within the ceramic chip
US Patent 5977927, 5892490
Meandered monopole embedded within the ceramic chip
SMA- Ceramic Chip Antenna (3)
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Printed Dipoles/Monopoles/Slot Antennas/ PIFAs Applied to Notebook Computer
US Patents 6344825, 6297779, 6008774, 6295029, 6339400, 2001/0040529, 2002/0021250
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WLAN Slot Antennas/PIFAs Applied to Laptops
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WLAN 2.4/5.2 GHz Dual-Band Dual-Slot Antenna
Antenna gain level in both 2.4 and 5.2 GHz about 6.0~7.0 dBi
Patent pending
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WLAN Metal-Plate Antenna (1)Antenna size = 3 x 60 mm2; gain level ~3.6 dBi in 2.4 GHz band
Patent pending
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WLAN Metal-Plate Antenna (2), dual-band operation
Antenna size = 1 x 3 x 60 mm3; gain level ~3.0/3.6 dBi in 2.4/5.2 GHz bands
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WLAN Metal-Plate Array Antenna
Antenna size = 5 x 5 x 65 mm3;
Gain level > 4 dBi in 5 GHz band;
Antenna constructed from a single metal plate
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WLAN Access-Point Antennas
n On-wall, on-ceiling, on-desk designsn Printed dipole array for omni or
diversity radiationn Printed folded dipole (or loop) array
for omni or diversity radiation
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WLAN AP Antenna-Omnidirectional dipole array (1)
5 GHz AP dipole array:
1.5:1 VSWR: 5.15-5.35 GHz
Peak gain: > 5.5 dBi (Duroid sub)
Omnidirectional ripple: < 2 dBi
Size: 12 mm x 90 mm
Ports 1, 2: 0o, 1/4 power
Ports 3, 4: 180o, 1/4 power
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WLAN AP Antenna-Omni dipole array (2)
BW covers 2.4/5.2 GHz bands
Gain level: ~ 2.5 dBi for 2.4 GHz band; ~4.0 dBi for 5.2 GHz band (FR4 sub)
Omnidirectional ripple: < 2 dBi
Size: 12 mm x 160 mm
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WLAN AP Antenna-Diversity dual-band dipole
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WLAN AP Antenna-Omnidirectional folded dipole
5 GHz AP dipole array:
2:1 VSWR: 5.0-6.1 GHz
Peak gain: > 4.5 dBi (FR4 substrate)
Omnidirectional ripple: < 1.8 dBi
Size: 18 mm x 68 mm
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WLAN AP Antenna-Omnidirectional folded dipole
Ansoft HFSS Simulation results
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Conclusions
n Planar antennas are good candidates for wireless devices applications
n More promising planar antenna designs and applications are in progress