Applications & Capabilities of Passive Integrated Transponder Tags

Authors: Alex Marini, Brian Kesner, Paul Marsh

Year: 2024

Abstract

Radio Frequency Identification (RFID) technology, particularly Passive Integrated Transponder (PIT) tags, plays a crucial role in monitoring and tracking aquatic species without direct observation. Since the initial releases of repatriated razorback suckers (Xyrauchen texanus) in Lake Mohave in 1992, monitoring techniques have evolved significantly. A major advancement occurred in 2010 with the introduction of remote PIT scanners capable of detecting 134.2 kilohertz (kHz) PIT tags, which enhanced the number of fish encounters. This technology was successfully integrated into the monitoring program, leading to expansions in 2012 and 2013. The study explores the characteristics and performance of two main types of PIT tags used in fisheries research: Full Duplex (FDX) and Half Duplex (HDX) tags. FDX tags facilitate continuous communication but are more susceptible to interference, necessitating specific antenna designs to optimize their functionality in aquatic environments. Conversely, HDX tags, while offering greater detection ranges, exhibit slower read rates due to their operational mechanics. Additionally, the research details the construction and tuning of PIT tag antennas, emphasizing the importance of inductance and capacitance in achieving optimal performance. Using the RM310 PIT scanner board as a case study, the analysis examines the configurations of capacitor banks and their impact on tuning to the desired frequency of 134.2 kHz. The findings provide essential insights into antenna design considerations, performance metrics, and practical implications for fisheries research, ultimately enhancing the efficacy of RFID technology in ecological monitoring.