Antenna Selection Guide

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  • Topic: Antenna, Impedance matching, Radio frequency antenna types
  • Pages : 46 (14100 words )
  • Download(s) : 138
  • Published : November 7, 2012
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Application Note AN058
Antenna Selection Guide
By Richard Wallace

Keywords
• • • • • Antenna Selection Anechoic Chamber Antenna Parameters 169 MHz (136 – 240 MHz) Antenna 315 MHz (273 – 348 MHz) Antenna • • • • • 433 MHz (387 – 510 MHz) Antenna 868 MHz (779 – 960 MHz) Antenna 915 MHz (779 – 960 MHz) Antenna 2.4 GHz Antenna CC-Antenna-DK

1

Introduction
In addition different antenna types are presented, with their pros and cons. All of the antenna reference designs available www.ti.com/lpw are presented on including the Antenna Development Kit [29]. The last section in this document contains references to additional antenna resources such as literature, applicable EM simulation tools and a list of antenna manufacturer and consultants. Correct choice of antenna will improve system performance and reduce the cost.

This application note describes important parameters to consider when deciding what kind of antenna to use in a short range device application. Important antenna parameters, different antenna types, design aspects and techniques for characterizing antennas are presented. Radiation pattern, gain, impedance matching, bandwidth, size and cost are some of the parameters discussed in this document. Antenna theory and measurement are also covered. practical

Figure 1. Texas Instruments Antenna Development Kit (CC-Antenna-DK)

SWRA161B

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Application Note AN058
Table of Contents
KEYWORDS 1 INTRODUCTION 2 ABBREVIATIONS 3 BRIEF ANTENNA THEORY 3.1 DIPOLE (Λ/2) ANTENNAS 3.2 MONOPOLE (Λ/4) ANTENNAS 3.3 WAVELENGTH CALCULATIONS FOR DIPOLE IN FREE SPACE 3.4 MAXIMUM POWER TRANSFER (VSWR) 3.5 ANTENNA PERFORMANCE CONSIDERATIONS 3.6 FRIIS TRANSMISSION EQUATION 4 ANTENNA TYPES 4.1 PCB ANTENNAS 4.1.1 TI Antenna Reference Designs 4.1.2 IP Based 4.2 CHIP ANTENNAS 4.3 WHIP ANTENNAS 4.4 WIRE ANTENNAS 5 ANTENNA PARAMETERS 5.1 RADIATION PATTERNS 5.1.1 Polarization 5.1.2 Ground Effects 5.2 DIRECTIONAL ANTENNAS 5.3 SIZE, COST AND PERFORMANCE 6 ANTENNA MEASUREMENTS 6.1 MEASURING BANDWIDTH WITH A SPECTRUM ANALYZER 6.2 MEASURING RL, IMPEDANCE AND BANDWIDTH WITH A NETWORK ANALYZER 6.2.1 Mounting of cable for S11 measurements 6.2.2 Calibration 6.2.3 Placement of the Device under Test 6.2.4 Interpreting Measurement Results 6.2.5 Antenna Matching 6.3 OVER-THE-AIR (OTA) MEASUREMENTS 7 ANTENNA REFERENCE DESIGNS AVAILABLE ON WWW.TI.COM/LPW 7.1 CC-ANTENNA-DK REFERENCE DESIGNS 7.2 2.4 GHZ ANTENNA REFERENCE DESIGNS 7.2.1 Single Ended Antennas 7.2.2 Differential Antennas 7.2.3 YAGI PCB Directional Antenna 7.3 SUB 1 GHZ ANTENNA REFERENCE DESIGNS 7.3.1 Reference Designs for 868/915/955 MHz Antennas 7.3.2 Reference Designs for 433 MHz Antennas 7.3.3 Reference Designs for 315 MHz Antennas 7.3.4 Reference Designs for 169 MHz Antennas 8 ADDITIONAL ANTENNA RESOURCES 8.1 ANTENNA LITERATURE 8.2 EM SIMULATION TOOLS 8.3 SMITH CHARTS – ANTENNA MATCHING 8.4 GERBER VIEWERS 8.5 E2E COMMUNITY 8.6 ANTENNA SUPPLIERS AND CONSULTANTS 9 SUMMARY 10 REFERENCES 11 GENERAL INFORMATION 11.1 DOCUMENT HISTORY 1 1 3 4 4 5 5 6 7 7 8 10 10 10 11 11 11 12 12 15 16 17 17 18 18 19 19 20 21 21 23 24 26 26 27 27 29 30 31 31 35 36 37 37 37 37 38 38 38 38 39 42 44 44

SWRA161B

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Application Note AN058
2 Abbreviations
Application Note Antenna Under Test Bill Of Materials Bandwidth Cellular Telecommunications Industry Association Carrier Wave Demonstration Board Development Kit Design Note Device Under Test Evaluation Board Effective Isotropic Radiated Power Electro Magnetic Evaluation Module Inverted-F Antenna Intellectual Property Industrial, Scientific, Medical Line of Sight Meandered Inverted-F Antenna Not Connected Near Horizon Partial Radiated Power Near Horizon Partial Radiated Power within 45 degrees angle Over The Air Printed Circuit Board Radio Frequency Return Loss Short Range Device Standing Wave Ratio Texas Instruments Total Radiated Power Time To Market Voltage Standing Wave Ratio Directional Antenna

AN AUT BOM BW CTIA CW...
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