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- 2018
- arbitrary coupling coefficients
- Dielectric resonator
- filtering
- coupler
- filtering balun
- dual-band
- dual-mode dielectric resonator (DR)
- Electronic Science and Technology
- Nantong University
- Sun Yat-Sen University
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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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Structural, optical, and dielectric studies of LaFe1?xMoxO3 (x?=?0.0, 0.5) perovskite materials
摘要： The structural, optical, and dielectric properties of LaFe1?xMoxO3 (x = 0.0, 0.5) synthesized by the sol–gel method were investigated by X-ray diffraction (XRD), Raman scattering, and impedance spectroscopy. XRD analysis revealed that the x = 0.5 compound is single-phase and orthorhombic, with space group Pbnm, similar to the parent x = 0.0 compound but with larger lattice parameters and/or a larger unit-cell volume. The Raman scattering spectra revealed local lattice distortions in the x = 0.5 compound and spin–phonon coupling related to the magnetic transition (Néel) temperature. The impedance data were well fitted with an R(R1-CPE1)//(R2-CPE2) equivalent electrical circuit, demonstrating the contributions of both grains and grain boundaries. The temperature (300–500 K) and frequency (100 Hz–1 MHz) dependences of the dielectric properties showed that Mo substitution adversely affected the dielectric parameters.
关键词： X-ray diffraction,LaFe1?xMoxO3,impedance spectroscopy,Raman scattering,sol–gel method,dielectric properties
更新于2025-09-04 15:30:14