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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Flexible High Magnetodielectric Materials for Antenna Applications (Invited)
摘要： A novel flexible magneto-dielectric (MD) substrate with high permeability (μr) and permittivity (εr) is developed in this work, and the excellent capability of the novel material for realizing miniaturized and broadband flexible antenna is demonstrated. The MD substrate is mainly comprised of NiZnCo ferrite and polyvinyl alcohol (PVA) through extrusion technology and obtains relatively high μr around 4.5 and εr around 9.0 over a wide frequency range of 10 MHz–1 GHz. A benchmark structure of square microstrip patch antenna was simulated using the common polyimide (PI) flexible substrate and the developed MD substrate, respectively, and MD substrate proves remarkable miniaturization effect. Based on the developed MD substrate, a miniaturized patch antenna working at ultrahigh frequency (UHF) 915 MHz was designed. The overall size of the antenna is 40×40×1 mm3, which is only one-quarter size of the PI substrate antenna. Also, the impedance bandwidth (S11<-10 dB) is enhanced from 8 MHz (910–918 MHz) to 30 MHz (900–930 MHz) for the MD substrate antenna.
关键词： flexible magneto-dielectric substrate,broadband antenna,polyvinyl alcohol,miniaturized antenna,NiZnCo ferrite
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Embedded Antenna Design on LoRa Radio for IoT Applications
摘要： This paper presents a miniaturized printed inverted-F antenna (PIFA) embedded on the circuit board of a LoRa sensor node for the internet of things (IoT) applications. On the 1.6 mm-thick board, very limited space is reserved for the antenna deployment, and therefore slots are cut on the ground to reduce operating frequency of the PIFA and create another resonance to broaden the bandwidth. Finally, the proposed antenna is optimized to operate from 402.4 MHz to 441.6 MHz with voltage standing wave ratio (VSWR) less than 3, and its realized gain over the 410-441 MHz LoRa frequency band is higher than -6 dBi.
关键词： internet of things,bandwidth enhancement,LoRa,miniaturized antenna
更新于2025-09-04 15:30:14