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Embedded Antenna for Handheld/Portable Devices (Support Bluetooth & 802.11)
NEARSON Inc.
7432 Alban Station Blvd., Suite B226
Springfield, VA 22150
Tel: 703-913-5552
Fax: 703-913-5553
URL: www.nearson.com
Email: [email protected]
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Embedded Inside Story
• Customization to Customer Specific Requirements;
• Optimal Performance at Reduced Cost;• Built-in Flexibility for Future Design
Changes;• State of the Art Design and Production
Capabilities
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Why Embedded ?
• Size• Cost• Security• Cosmetic/Aesthetic• Technology Advantages
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Embedded Antenna Applications
• PAMCIA Card for Wireless Modem• Wireless LAN• Bluetooth• Palm Computer(PDA) Technology• Bar Code Scanner• Point of Sale RFID
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Embedded Antenna
• Basic Guidelines
• Tuning
• Impedance Matching
• VSWR
• Gain and Orientation
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Design Parameters
Increase Your Wireless Connection Efficiency
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Antenna Design Parameters
• Antennas must be tuned to correct
operating frequency band
• Bluetooth and 802.11 operate at 2.4GHz ~ 2.5GHz , ISM band
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Tuning
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Antenna Design Parameters
• 50 input impedance of antenna matches to 50 output impedance of RF module
• If impedance mismatching, a reflected voltage cause instability of RF module and poor power transfer from RF module
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Impedance Matching
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Antenna Design Parameters
• Return Loss is a measurement of reflection General specification is VSWR 2.0
• power
• When VSWR = 2 Return Loss = -10dB, General specification of return loss is -10dB
• Voltage Standing Wave Ratio (VSWR) is a ratio of the max. and min. voltage, which is the combination of inserting and reflecting voltage wave
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VSWR
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Antenna Design Parameters
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VSWR & Return Loss Plot
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Antenna Design Parameters
• Use Network Analyzer Agilent 8753ES 300k to 6GHz
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VSWR & Return Loss Measurement
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VSWR And Radiation Pattern
• R/S ZVC 300kHz ~ 8GHz Network Analyzer• Agilent 8753D Network Analyzer
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Testing Equipment
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Antenna Design Parameters
• Gain is the ability of radiating and receiving of antenna
• Maximize gain– Minimize losses in feed line– Use good electrically materials such as
• Good conductor• Low loss polymers
– Minimize impedance mismatch losses• Well VSWR or return loss
• By radiation pattern measurement to find out real gain value and orientation of antenna
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Gain and Orientation
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Antenna Design Parameters
• Anechoic Chamber– 3D 4 9 4(m3) room with shielded and absorber
– pattern
– 750-8GHz
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Gain and Orientation Measurement
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Radiation Pattern Testing Equipment
• Horn Antenna : DRH-0118
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Embedded Antenna
• Omni Function When Open or Close
• Built Inside of Casing; No Extra Portion out of Body
• Smaller Size to Fit Limited Space
• Consider Al-Mg Casing Application
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Design Requirements
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802.11 & Bluetooth Antenna
• Keep Free Space Surround Antenna to Derive Omni Function When LCD Open or Close
• To Get Smaller Size with Different Design or Change Substrate Material Like Ceramic
• Keep Antenna out of Al-Mg Casing
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Solution to Customer Requirement
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Antenna Placement and Function
1. Bluetooth2. Wireless Lan 802.11
802.11 mini pci module usually has 2 RF input and bluetooth has 1
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802.11 & Bluetooth Antenna
天線位置圖
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Target Position
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-10
-5
0
907560
4530150345330
315300285
270255240
225210195180165150135120105
802.11 & Bluetooth Antenna
Open HOpen E
Close E Close H
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Test Function
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802.11 & Bluetooth Antenna
AntennaTransmit coax cable
Coax Connector
Antenna Coax cable Coax connector
TypeGain(dBi)
Max. ref.
Diameter
(Φmm)Attenuation(dB/m)2.5G
Brand
or typeP/N Size ref.
Air dipole 2.5 0.85 5.8Hirose
Murata
UFL-LP-040
MXTK92----
5x3x2.5mm
5x2.8x2.0mm
PCB dipole 2 1.13 3.3 MMCX RMCX-- 10x6x5mm
PCB μ-strip 1.6 1.32 2.4 Hirose U.FL-LP-066 5x3x2.5mm
PCB μ-strip 1.8 1.32 2.4 Hirose U.FL-LP-066 5x3x2.5mm
PCB μ-strip 2.1 1.32 2.4 Hirose U.FL-LP-066 5x3x2.5mm
PCB μ-strip 1.5 1.32 2.4 Hirose U.FL-LP-066 5x3x2.5mm
PCB μ-strip 1.3 1.32 2.4 Hirose U.FL-LP-066 5x3x2.5mm
PIFA 2.3 1.32 2.4 Hirose U.FL-LP-066 5x3x2.5mm
Assembly Analysis
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802.11 & Bluetooth Antenna
Customer inquiry
RD project team
Antenna type decide
Antenna mock up
Antenna SWR return loss ckeck
Antenna pattern test
Objective pattern test
Antenna Spec. finalize
Antenna sample submit
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Design Route
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802.11 & Bluetooth Antenna
RD project team
Mass production meeting
Standard operation procedure set up
Working instruction set up
Antenna pilot run
Antenna Mass prod.
Antenna SWR & return loss FQA 100% test
Antenna shipment
Production equipment set up
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Production Route
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Mass Production Process Testing Equipment
• Semi-automatic Stripper : Schleuniger MP 257
• Automatic Stripper : Schleuniger PS9500/RS
• Accurate Coaxial Cable Cover Strip
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Mass Production Process Testing Equipment
• Agilent 8714 Network Analyzer
• Testing and Qualify Each Antenna’s VSWR
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802.11 & Bluetooth Antenna
RD project team
QC project meeting
Antenna QC flow chart
Antenna component IQC
Antenna SWR return loss IPQC check
Antenna dimension check
Antenna production improvement
Antenna defect analysis
Antenna shipment with QA report
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Quality Assurance Route
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NEARSONNEARSON design teams utilized state of the art design teams utilized state of the art computer simulation technology to speed up the computer simulation technology to speed up the development cycle thus reducing production-development cycle thus reducing production-manufacturing turn around time. Our engineers manufacturing turn around time. Our engineers work closely with our customers in all aspects of work closely with our customers in all aspects of design, implementation, and production of our design, implementation, and production of our customers embedded antenna solutions.customers embedded antenna solutions.
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