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 :...
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
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
LTE Basestation Type
• Standard base station(Macrocell) :35 km
• Microcell :2 km• Picocell :200 m• Femtocell :10 m
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
Literature Review (2/3)CN203071229U_201320020787.9_SIPO
41 42 : Upper band radiator43 : Lower band radiator50 : feeding network
Literature Review (3/3)“Broadband Dual-Frequency and Dual-Polarized Antennas for GSM/3G/LTE Base Stations”
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
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
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
Antenna Performance at Lower Band
End loading reduce the size
End loading reduce the size
Antenna Performance at Upper Band
Antenna Performance at Both Bands Using Separate Ports
Antenna Performance at Both Bands Combined with Feeding Network
Diplexer
Use CST Design Studio to realize feeding network.
Radiation Patterns698MHz 860MHz 960MHz
1770MHz 1990MHz 2700MHz
Array Implementation Realizing Dual Polarization
+45 degree polarization
-45 degree polarization
Fabricated Prototype and Measurement Results
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S11
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Frequency (GHz)
-45 Degree 45 Degree
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)
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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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806MHz 1990MHz 2600MHz
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2600MHz Co-polar 2600MHz X-polar
XZ-plane
YZ-plane
Envelope Correlation Coefficient from S-parameter
Diversity Gain from S-parameter
Envelope Correlation Coefficient from FarField Result
Diversity Gain from FarField Result
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.