Fabrication and Characterization of CoFe2O4 and MnFe2O4 Nanomagnetic Thin Films for RF Applications

He, Yingdong; Chen, Weiya; Drew, Eric; Zhang, Z. John; Papapolymerou, John

doi:10.1109/tcpmt.2019.2895632

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…where the magnetic loss quality factor Q m ¼ 1 tanδ μ . Since the dielectric loss tangent tan δ ϵ of the NiFe 2 O 4 nanoparticle films is very low [16,24], we consider that the dielectric Q d is not affected. Using the transmission line model, the total conductance G t can be determined as [20]…”

Section: Antenna On Magnetic Film Loaded Substratementioning

confidence: 99%

“…In our recent work, magnetic films made of various composites that were fabricated using effective and low-cost chemical methods have been characterised to exhibit high magnetisation saturation and controllable film thickness [16]. These magnetic films have been demonstrated in RF circuits and antennas to show good performance [17,18].…”

Section: The Characteristics and Fabrication Of Nife 2 O 4 Filmsmentioning

confidence: 99%

“…In our study, by taking advantage of the flexibility of the 3D printing technique and the low‐cost chemical methods [16], we managed to deposit significant amounts of NiFe 2 O 4 nanoparticles within the air cavity such that the magnetic film thickness is very close to that of the air substrate, thereby creating an antenna on magnetic‐film‐loaded substrate, as shown in Figure 2 (the auxiliary part is not shown). Note that the magnetic film thickness can be adjusted through our chemical deposition process, which grants us another degree of freedom to control the antenna performance.Because of the loaded magnetic film, the antenna substrate now has a μ r _sub > 1, and a magnetic loss tangent tan δ μ , which depends on the inhomogeneity of the film, the nanoparticle fill factor and the film surface roughness [23].…”

Section: Antenna Design and Theoretical Analysismentioning

confidence: 99%

“…and

η_{normalr normala normald} = \frac{1}{1 + Q_{normals normalp} ((), \frac{1}{Q_{normals normalw}} + \frac{1}{Q_{normalc}} + \frac{1}{Q_{normald}} + \frac{1}{Q_{normalm}})}

where the magnetic loss quality factor

Q_{normalm} = \frac{1}{\tan δ_{μ}}

. Since the dielectric loss tangent tan δ ϵ of the NiFe 2 O 4 nanoparticle films is very low [16, 24], we consider that the dielectric Q d is not affected. Using the transmission line model, the total conductance G t can be determined as [20]

G_{normalt} = \frac{W_{normalp}}{120 π} k ([], 1 - \frac{1}{24} {((), k h_{normals normalu normalb})}^{2})

where

k = ω_{0} \sqrt{μ_{normalr_normals normalu normalb} ϵ_{normalr_normals normalu normalb}}

.…”

Section: Antenna Design and Theoretical Analysismentioning

confidence: 99%

“…In authors' previous work, low-cost and effective chemical methods of fabricating thick magnetic films using various material composite nanoparticles were proposed, which were utilised to develop several Radio frequency (RF) circuits with improved performance [16][17][18]. Recently, in [18], a 30-μm MnFe 2 O 4 nanoparticle film loaded rectangular patch antenna achieves a frequency shift of 0.5 GHz, a gain enhancement of 0.5 dB and an improved bandwidth by 0.14 GHz, which is promising in antenna miniaturisation.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Compact patch antenna on thick (>800 μm) NiFe ₂ O ₄ magnetic film

Drew

Zhang

et al. 2020

IET Microwaves Antenna & Prop

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In this paper, we demonstrate a thick magnetic film loaded patch antenna which shows great potential in antenna miniaturisation with enhanced performance. First, a microstrip patch antenna is designed on a 3D‐printed air substrate which operates at 8.21 GHz with a measured realised gain of 8.2 dBi. Using the solution cast chemical method, we fabricate the nickel ferrite nanoparticle films within the air substrate achieving an estimated film thickness of 875–900 μm. Due to the different film thicknesses, the resonant frequency of the antenna shifts down by 0.75–1.75 GHz, indicating a 9.3%–21.3% of size reduction. At the same time, the bandwidth is improved by 0.16–0.25 GHz. The realised gain and efficiency are increased by 0.6 dB and 6%, respectively, given a good film quality.

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Section: Antenna On Magnetic Film Loaded Substratementioning

confidence: 99%