Transcription of Design Note DN038 - TI.com
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Design Note DN038 - TI.com
Design Note DN038 SWRA416 Page 1 of 24 Miniature helical PCB Antenna for 868 MHz or 915/920 MHz By Richard Wallace Keywords Miniature helical PCB Antenna Optimized for compact designs 868 or 915/920 MHz ISM Bands CC11xx CC12xx 1 Introduction This document describes a compact PCB helical antenna that has been specifically designed for 868 MHz or 915/920 MHz ISM bands. The PCB helical antenna requires two matching components for matching to a 50-ohm load. When a large PCB area (38 mm x 24 mm) is available for the antenna then the recommended antenna is DN024 [1] since the impedance is closer to 50 ohm without any external matching components (868 MHz: 30+j11; VSWR ) and the bandwidth is around 90 MHz.
Design Note DN038 SWRA416 Page 1 of 24 Miniature Helical PCB Antenna for 868 MHz or 915/920 MHz By Richard Wallace Keywords Miniature Helical PCB Antenna Optimized for compact designs
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