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A compact, 3D printed tripolar antenna operating at 2.4 GHz is presented. The antenna is designed for integration with a commercial wireless node in order to mitigate multipath and depolarization channel effects that could exist in many machine-to-machine deployments. The antenna substrate is fabricated with fused deposition modeling and the conductive layers by micro-dispensing silver paste. A median...
In this work a new broadband circularly-polarized antenna is presented for ultrahigh frequency (UHF) RFID systems. The antenna is designed to simultaneously cover the European and American RFID/ISM band (860–868 MHz and 902–928 MHz, respectively). The simulated data shows a 10 dB return loss bandwidth covering the frequency range from 846 MHz up to 959 MHz, making the antenna suitable for RFID systems...
A meander-line antenna fed in quadrifilar fashion for circular polarized (CP) operation is presented. The antenna and feed network are designed to operate in the 434 MHZ RFID/ISM band (432–435 MHz in this application). The four bowtie elements are fed by a 180 power splitter and 90 degree phase shifters to achieve circularly polarized radiation. Initial measurements show good performance in the 432–435...
This paper describes the design, fabrication, and experimental validation of a compact antenna reconfigurable in frequency using PIN diode switches. The resulting device has a footprint under 0.2λ × 0.2λ at the lowest operating frequency and affords frequency tunability in the band 1.7GHz–2.7GHz with five PIN diode switches. Key aspects such as the importance of efficient full-wave simulation and...
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