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2.4G倒F天线详细尺寸.pdf

发布时间：2022-05-29 发布人：admin 分类：说明书 资料大小：0.39M 资料格式：pdf 举报 版权申诉
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    Introduction
    Abbreviations
    Description of the Inverted F Antenna Design
    Implementation of the Inverted F Antenna
    Results
    Radiation Pattern
    Reflection
    Bandwidth
    Conclusion
    References
    General Information
    Document History
    Important Notice
    2.4 GHz Inverted F Antenna Keywords • CC2400 • CC2420 • CC2430 • CC2431 • CC2500 • CC2510 1 Introduction Design Note DN0007 By Audun Andersen • CC2511 • CC2550 • PCB Antenna • 2.4 GHz • Inverted F Antenna This document describes a PCB antenna design that can be used with all 2.4 GHz transceivers and transmitters from Texas Instruments. Maximum gain is measured to be +3.3 dB and overall size requirements for this antenna is 25.7 x 7.5 mm. Thus, this is a compact, low cost and high performance antenna. SWRU120 Page 1 of 15
    Design Note DN0007 Table of Contents KEYWORDS.............................................................................................................................. 1 INTRODUCTION............................................................................................................. 1 1 ABBREVIATIONS........................................................................................................... 2 2 3 DESCRIPTION OF THE INVERTED F ANTENNA DESIGN ......................................... 3 IMPLEMENTATION OF THE INVERTED F ANTENNA.......................................................... 3 4 RESULTS........................................................................................................................ 4 RADIATION PATTERN.................................................................................................. 4 REFLECTION ............................................................................................................ 11 BANDWIDTH............................................................................................................. 11 CONCLUSION .............................................................................................................. 12 REFERENCES.............................................................................................................. 13 GENERAL INFORMATION .......................................................................................... 14 DOCUMENT HISTORY................................................................................................ 14 IMPORTANT NOTICE .................................................................................................. 15 3.1 4.1 4.2 4.3 7.1 5 6 7 8 2 Abbreviations EM IFA ISM PCB Evaluation Module Inverted F Antenna Industrial, Scientific, Medical Printed Circuit Board SWRU120 Page 2 of 15
    Design Note DN0007 Description of the Inverted F Antenna Design 3 Since the impedance of the Inverted F Antenna is matched directly to 50 ohm no external matching components are needed. Implementation of the Inverted F Antenna 3.1 It is important to make an exact copy of the antenna dimensions to obtain optimum performance. The easiest approach to implement the antenna in a PCB CAD tool is to import the antenna layout from either a gerber or DXF file. Such files are included in CC2430DB reference design [1]. The gerber file is called “Inverted_F_Antenna.spl” and the DXF file is called “Inverted_F_Antenna.dxf”. If the antenna is implemented on a PCB that is wider than the antenna it is important to avoid placing components or having a ground plane close to the end points of the antenna. If the CAD tool being used doesn’t support import of gerber or DXF files, Figure 1 and Table 1 can be used. Figure 1. IFA Dimensions H1 H2 H3 H4 H5 H6 H7 H8 H9 W1 5.70 mm W2 0.74 mm L1 1.29 mm L2 2.21 mm L3 0.66 mm L4 1.21 mm L5 0.80 mm L6 1.80 mm L7 0.61 mm L8 1.21 mm 0.46 mm 25.58 mm 16.40 mm 2.18 mm 4.80 mm 1.00 mm 1.00 mm 3.20 mm 0.45 mm Table 1. IFA Dimensions Since there is no ground plane beneath the antenna, PCB thickness will have little effect on the performance. The results presented in this design note are based on an antenna implemented on a PCB with 1 mm thickness. SWRU120 Page 3 of 15
    Design Note DN0007 4 Results All results presented in this chapter are based on measurements performed with CC2430DB [1]. 4.1 Radiation Pattern Figure 2 shows how to relate all the radiation patterns to the orientation of the antenna. The radiation patterns were measured with CC2430 programmed to 0 dBm output power. XY plane XZ plane YZ plane Figure 2. How to Relate the Antenna to the Radiation Patterns SWRU120 Page 4 of 15
    Design Note DN0007 Figure 3. XY Plane Vertical Polarization SWRU120 Page 5 of 15
    Design Note DN0007 Figure 4. XY Plane Horizontal Polarization SWRU120 Page 6 of 15
    Design Note DN0007 Figure 5. XZ Plane Vertical Polarization SWRU120 Page 7 of 15
    Design Note DN0007 Figure 6. XZ Plane Horizontal Polarization SWRU120 Page 8 of 15
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