《Small Size 2.4 GHz PCB antenna》.pdf

Application Note AN043 Small Size 2.4 GHz PCB antenna By Audun Andersen 1 KEYWORDS • CC25xx • USB dongle • CC24xx • 2.4 GHz • CC2480 • Inverted F Antenna • PCB antenna 2 INTRODUCTION The PCB antenna used on the CC2511 and considerations for complying with USB dongle reference design is described regulatory limits when using this design. in this application note. Even if the antenna presented is for a USB dongle The suggested antenna design requires design it can be used in all 2.4 GHz no more than 15.2 x 5.7 mm of space and designs, especially where small space is ensures a VSWR ratio of less than 2 required for the antenna. across the 2.4 GHz ISM band when connected to a 50 ohm source. This application note describes the antenna dimensions, the RF performance Figure 1: CC2511 USB Dongle SWRA117D Page 1 of 21 Application Note AN043 Table of Contents 1 KEYWORDS 1 2 INTRODUCTION 1 3 ABBREVIATIONS 2 4 ANTENNA DESIGN 3 4.1 DESIGN GOALS 3 4.2 SIMULATION 3 4.3 LAYOUT AND IMPLEMENTATION 4 5 TEST RESULTS 5 5.1 REFLECTION 5 5.2 RADIATION PATTERN 7 5.3 OUTPUT POWER 15 5.4 SPURIOUS EMISSION AND HARMONICS 17 6 CONCLUSION 20 7 GENERAL INFORMATION 21 7.1 DOCUMENT HISTORY 21