04-12-2012, 01:00 PM
Smart Antenna Design
[attachment=42400]
Major Challenges facing wireless communication industry
Signal Reliability
Minimize signal loss
Combat multipath fading effects
Power requirements
Miniaturization
Data rates
Frequency utilization
Solving these problems
Of the challenges listed, Signal Reliability is the most important challenge to address.
Customers will demand it
Direct measure of Quality of Service
Improves the overall system performance
Reduces power requirements
Reduces dropped calls and lost data
Increases system efficiency
Antenna Diversity: Overview
Utilize Multiple Antennas to Improve Signal Reliability
Considerable performance improvements can be obtained
Incorporated into most mobile telephone basestations
Limited(Almost Non-Existent) use in mobile handsets
Design Challenges - Integrating Multiple Antennas on a mobile handset
Physical size of dual/multiple antennas
Conformal Antennas
Performance
Antenna Isolation
Envelope Cross Correlation
Performance degradation due to biological tissue
Conformal Antennas
Size and location on handset
Bandwidth
Sensitivity to design parameters
System Analysis with Ansoft Symphony
Adaptive Processing is intended to modify receiver characteristics with a changing signal
environment to improve performance
At the system level, Ansoft Symphony can be used to investigate receiver improvements
Mixed mode simulator – Time/Frequency Domain
Time Domain: inter-symbol interference (ISI - delay and signal spreading between signals),
multi-path reflection interference, amplitude/phase distortion, SNR and BER degradation due to
noise (Gaussian, shot and thermal), etc.
Frequency Domain: inter-modulation and harmonic distortion, spectral regrowth, Doppler
effects, spurious signal generation, small carrier suppression due to large interferer, etc.
Powerful models: Channel Equalization, Raleigh Fading, Rohde and Schwarz 3G I and Q baseband
signal sources, CDMA Toolbox, MATLAB™ and C co-simulation
Antenna Diversity: Antenna Geometry
The basic geometry for a single capacitively
loaded PIFA antenna is shown here. It is
mounted on a box 80x40x10mm which is
representative of a compact mobile telephone
handset
The following slide outlines the nominal
antenna dimensions
To investigate the performance of the
antenna we will use Ansoft HFSS, Ansoft
Optimetrics, and Ansoft Serenade.
[attachment=42400]
Major Challenges facing wireless communication industry
Signal Reliability
Minimize signal loss
Combat multipath fading effects
Power requirements
Miniaturization
Data rates
Frequency utilization
Solving these problems
Of the challenges listed, Signal Reliability is the most important challenge to address.
Customers will demand it
Direct measure of Quality of Service
Improves the overall system performance
Reduces power requirements
Reduces dropped calls and lost data
Increases system efficiency
Antenna Diversity: Overview
Utilize Multiple Antennas to Improve Signal Reliability
Considerable performance improvements can be obtained
Incorporated into most mobile telephone basestations
Limited(Almost Non-Existent) use in mobile handsets
Design Challenges - Integrating Multiple Antennas on a mobile handset
Physical size of dual/multiple antennas
Conformal Antennas
Performance
Antenna Isolation
Envelope Cross Correlation
Performance degradation due to biological tissue
Conformal Antennas
Size and location on handset
Bandwidth
Sensitivity to design parameters
System Analysis with Ansoft Symphony
Adaptive Processing is intended to modify receiver characteristics with a changing signal
environment to improve performance
At the system level, Ansoft Symphony can be used to investigate receiver improvements
Mixed mode simulator – Time/Frequency Domain
Time Domain: inter-symbol interference (ISI - delay and signal spreading between signals),
multi-path reflection interference, amplitude/phase distortion, SNR and BER degradation due to
noise (Gaussian, shot and thermal), etc.
Frequency Domain: inter-modulation and harmonic distortion, spectral regrowth, Doppler
effects, spurious signal generation, small carrier suppression due to large interferer, etc.
Powerful models: Channel Equalization, Raleigh Fading, Rohde and Schwarz 3G I and Q baseband
signal sources, CDMA Toolbox, MATLAB™ and C co-simulation
Antenna Diversity: Antenna Geometry
The basic geometry for a single capacitively
loaded PIFA antenna is shown here. It is
mounted on a box 80x40x10mm which is
representative of a compact mobile telephone
handset
The following slide outlines the nominal
antenna dimensions
To investigate the performance of the
antenna we will use Ansoft HFSS, Ansoft
Optimetrics, and Ansoft Serenade.