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Application Report

2.4-GHz Inverted F Antenna

ABSTRACT

This document describes a printed-circuit board (PCB) antenna design that can be used with all 2.4-GHz

transceivers and transmitters from Texas Instruments

™

. The maximum gain when used on the reference board

is measured to be +3.3 dBi, and the overall size requirements for this antenna are 25.7 × 7.5 mm (not including

ground plane).

Table of Contents

1 Description of the antenna Design........................................................................................................................................2

2 Measurement Results.............................................................................................................................................................3

2.1 Radiation Pattern............................................................................................................................................................... 3

2.2 Reflection......................................................................................................................................................................... 10

2.3 Bandwidth.........................................................................................................................................................................11

3 Summary................................................................................................................................................................................11

4 References.............................................................................................................................................................................11

5 Revision History................................................................................................................................................................... 12

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Texas Instruments

™

is a trademark of Texas Instruments.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

SWRU120D – APRIL 2007 – REVISED JANUARY 2019

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2.4-GHz Inverted F Antenna 1

Summary of content (13 pages)

PAGE 1
www.ti.com Table of Contents Application Report 2.4-GHz Inverted F Antenna ABSTRACT This document describes a printed-circuit board (PCB) antenna design that can be used with all 2.4-GHz transceivers and transmitters from Texas Instruments™. The maximum gain when used on the reference board is measured to be +3.3 dBi, and the overall size requirements for this antenna are 25.7 × 7.5 mm (not including ground plane). Table of Contents 1 Description of the antenna Design...................................
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Description of the antenna Design www.ti.com 1 Description of the antenna Design 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 a gerber file or a 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.
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www.ti.com Measurement Results 2 Measurement Results All of the results presented in this section are based on measurements performed with the CC2430DB [1] evaluation board. 2.1 Radiation Pattern Figure 2-1 shows how to relate all of the radiation patterns to the orientation of the antenna. The radiation patterns were measured with the CC2430 device programmed to 0-dBm output power. Figure 2-1.
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Measurement Results www.ti.com Figure 2-2 shows the XY plane vertical polarization. Figure 2-2. XY Plane–Vertical Polarization 4 2.
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www.ti.com Measurement Results Figure 2-3 shows the XY plane horizontal polarization. Figure 2-3. XY Plane–Horizontal Polarization SWRU120D – APRIL 2007 – REVISED JANUARY 2019 Submit Document Feedback 2.
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Measurement Results www.ti.com Figure 2-4 shows the XZ plane vertical polarization. Figure 2-4. XZ Plane–Vertical Polarization 6 2.
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www.ti.com Measurement Results Figure 2-5 shows the XZ plane horizontal polarization. Figure 2-5. XZ Plane–Horizontal Polarization SWRU120D – APRIL 2007 – REVISED JANUARY 2019 Submit Document Feedback 2.
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Measurement Results www.ti.com Figure 2-6 shows the YZ plane vertical polarization. Figure 2-6. YZ Plane–Vertical Polarization 8 2.
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www.ti.com Measurement Results Figure 2-7 shows the YZ plane horizontal polarization. Figure 2-7. YZ Plane–Horizontal Polarization SWRU120D – APRIL 2007 – REVISED JANUARY 2019 Submit Document Feedback 2.
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Measurement Results www.ti.com 2.2 Reflection Figure 2-8 shows that the IFA ensures less than 10% reflection of the available power for a bandwidth of more than 300 MHz. A large bandwidth makes the antenna less sensitive to detuning because of plastic encapsulation or other objects in the vicinity of the antenna. Figure 2-8. Measured Reflection at Feed Point of Antenna 10 2.
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www.ti.com Measurement Results 2.3 Bandwidth Another way of measuring the bandwidth after the antenna is implemented on a PCB and connected to a transmitter is to write test software that steps a carrier across the frequency band of interest. By using the maximum hold function on a spectrum analyzer, the variation in output power across frequency can easily be measured.
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Revision History www.ti.com 5 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision C (February 2017) to Revision D (January 2019) Page • Update was made in the Abstract of this document........................................................................................... 1 • Update was made to Section 1........................................................................................................................
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