Dual-band and Dual-polarized Antenna for LTE Femto · 2G systems : GSM900/GSM1800 and CDMA ... 50 :...
Transcript of Dual-band and Dual-polarized Antenna for LTE Femto · 2G systems : GSM900/GSM1800 and CDMA ... 50 :...
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Dual-band and Dual-polarized Antenna for LTE Femto/Pico-cell Basestation Applications
Ting-Jui Huang and Heng-Tung HsuDepartment of Communications Engineering,Yuan Ze
University
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Outline
• Introduction• Literature Review• Simulation and measurement Results• Summary
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Introduction• Nowadays different mobile communication systems have been
designated with different frequency bands.
2G systems : GSM900/GSM1800 and CDMA(Center at 900 MHz (825–960MHz) and 1800 MHz (1710–1920 MHz))
3G systems : WCDMA/cdma2000, TDCDMA and WiMAX (Center at 2 GHz (1880–2170 MHz)
LTE (4G) systems : VoLTE/CSFB and SVLTE (Center at820MHz (689-960MHz) and 2.2GHz(1710-2690MHz))
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LTE Band
• 4G Spectrum Allocation in Taiwan: Band 3 1800MHz Band 8 900MHzBand 28 700MHz.
A.700MHz - Band 28:uplink 703-748MHz/downlink 758-803MHz
B.900MHz - Band 8:uplink 885-915MHz/downlink 930-960MHz
C.1800MHz - Band 3:uplink 1710-1770MHz/downlink 1805-1865MHz
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LTE Basestation Type
• Standard base station(Macrocell) :35 km
• Microcell :2 km• Picocell :200 m• Femtocell :10 m
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Literature Review (1/3)CN202231146U_201120352736.7_SIPO
• 3 : Lower band radiator• 4 : Dual polarization
upper band radiator• 21 : High pass filter• 22 : Low pass filter
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Literature Review (2/3)CN203071229U_201320020787.9_SIPO
41 42 : Upper band radiator43 : Lower band radiator50 : feeding network
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Literature Review (3/3)“Broadband Dual-Frequency and Dual-Polarized Antennas for GSM/3G/LTE Base Stations”
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Cont.(Base Station Application)
Broadband dual frequency antennaGain: lower band up to 12dBi
upper band up to 13dBiPolarization: Linear
Broadband dual polarized antennaGain: up to 15dBiPolarization: +45o & -45o
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Antenna Design Challenge
• Wide Bandwidth (Low band 698MHz-960MHz 31.6%Up band 1710MHz-2690MHz 44.5%)
• Dual Polarization (MIMO Application)• High gain• Directive Radiation Pattern• Capability of Smart Antenna Implementation
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Antenna ConfigurationWideband Dipole Antenna
Hsu, H.-T.; Huang, T.-J., "Generic dipole-based antenna-featuring dual-band and wideband modes of operation," Microwaves, Antennas & Propagation, IET , vol.6, no.15, pp.1623,1628, December 11 2012
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Antenna Performance at Lower Band
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Antenna Performance at Upper Band
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Antenna Performance at Both Bands Using Separate Ports
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Antenna Performance at Both Bands Combined with Feeding Network
Diplexer
Use CST Design Studio to realize feeding network.
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Radiation Patterns698MHz 860MHz 960MHz
1770MHz 1990MHz 2700MHz
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Array Implementation Realizing Dual Polarization
+45 degree polarization
-45 degree polarization
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Fabricated Prototype and Measurement Results
0.0 0.5 1.0 1.5 2.0 2.5 3.0-50
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S11
(dB
)
Frequency (GHz)
-45 Degree 45 Degree
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Measured Gain• LTE lower band =0.698MHz-0.960MHz (>6dBi)• LTE Upper band =1710MHz-2700MHz (>7dBi)
0.50 0.75 1.00 2.0 2.5 3.0
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simulation measurement -45degree measurement 45degree
Gai
n (d
Bi)
Frequency (GHz)
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Measured Radiation Pattern
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806MHz Co-polar 806MHz X-polar
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2600MHz Co-polar 2600MHz X-polar
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1990MHz Co-polar 1990MHz X-polar
806MHz 1990MHz 2600MHz
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2600MHz Co-polar 2600MHz X-polar
XZ-plane
YZ-plane
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Envelope Correlation Coefficient from S-parameter
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Diversity Gain from S-parameter
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Envelope Correlation Coefficient from FarField Result
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Diversity Gain from FarField Result
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Summary
• We have presented the design, analysis, and measurement results of a dual-band, dual-polarized antenna for LTE basestation applications.
• The antenna featured complete frequency coverage in 4G LTE bands with good gain performance.
• The agreement between the simulation and measurement results has proven the effectiveness of CST in MIMO antenna designs.