Bandwidth-enhanced magnetoelectric antenna based on composite bulk acoustic resonators

Yun, Xiaofan; Lin, Wenfang; Hu, Rui; Liu, Yizhang; Wang, Xiaoyi; Yu, Guo; Zeng, Zhongming; Zhang, Xinping; Zhang, Baoshun

doi:10.1063/5.0098323

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…由于磁电耦合系数与外加偏置磁场有关, 所以有些研究通过整合外加永磁体或者外加线圈的方式, 增大偏置磁场, 从而提高辐射效率 [122,123] . 受多输入多输出(multiple-input multiple-output, MIMO)天线的启发, 同样可以通过并联多个磁电天线实现天线阵列, 增强辐射场强度和提高辐射效率 [124] . 或者通过MEMS操作, 实现多个不同结构的谐振器并联, 实现多带宽 [125] .…”

Section: 磁电天线unclassified

Magneto-acoustic coupling: Physics, materials, and devices

Chen,

Ma,

Pan

et al. 2024

Acta Phys. Sin.

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Acoustic waves in solids have two modes of propagation: the bulk acoustic wave (BAW), which propagates inside solids in the form of longitudinal or transverse wave, and the surface acoustic wave (SAW), which is generated on the surface of solids and propagates along the surface. Acoustic radio frequency (RF) technologies utilize acoustic waves to intercept and process RF signals, which are typified by the rapidly developing RF filter technology. Acoustic filters have the advantages of small size, low cost, steady performance and simple fabrication, and are widely applied in mobile communications and other fields. Due to the mature fabrication process and well-defined resonance frequency of acoustic devices, acoustic wave has become an extremely intriguing way to manipulate magnetism and spin current, with the goal of pursuing miniaturized, ultra-fast, and energy-efficient spintronic device applications. The integration of magnetic materials into acoustic RF devices has also provided a new way of thinking about the means of acoustic device modulation and performance enhancement. This review firstly summarizes various physical mechanisms of magneto-acoustic coupling, and then based on these mechanisms, a variety of magnetic and spin phenomena such as acoustically controlled magnetization dynamics, magnetization switching, magnetic domain wall and magnetic skyrmions generation and motion, and spin current generation are systematically introduced. In addition, the progress of research on magnetic control of acoustic wave, the inverse process of acoustic control of magnetism, is discussed, including the magnetic modulation of acoustic wave parameters and nonreciprocal propagation of acoustic waves, as well as new magneto-acoustic devices developed based on this, such as SAW-based magnetic field sensors, magneto-electric antennas, tunable filters, and so on. Finally, possible future research goals and applications of magneto-acoustic coupling are envisioned. In summary, the field of magneto-acoustic coupling is still in a stage of rapid development, and a series of groundbreaking breakthroughs have been made in the last decades, and this paper summarizes the major advances in this field. The field of magneto-acoustic coupling is expected to make further significant breakthroughs, and we hope that this review will further advance the physical phenomena of the coupling between magnetism and acoustic wave, spin and lattice, as well as the potential device applications.

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Section: 磁电天线unclassified

Magneto-acoustic coupling: Physics, materials, and devices

Chen,

Ma,

Pan

et al. 2024

Acta Phys. Sin.

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“…However, the ME antenna still has issues with narrow bandwidth and low gain [1,[12][13][14]. [16]. In the same year, they manufactured and demonstrated an ME antenna driven by a high-overtone bulk-acoustic resonator (HBAR), which has a floating potential structure (FPA).…”

Section: Introductionmentioning

confidence: 99%

Structural Optimization Design of Magnetoelectric Thin-Film Antenna for Bandwidth and Radiation Enhancement

Li,

Zhao,

Wang

et al. 2024

Micromachines

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The acoustically actuated nanomechanical magnetoelectric (ME) antennas represent a promising new technology that can significantly reduce antenna size by 1–2 orders of magnitude compared to traditional antennas. However, current ME antennas face challenges such as low antenna gain and narrow operating bandwidth, limiting their engineering applications. In this paper, we enhance the bandwidth and radiation performance of ME antennas through structural optimization, leveraging theoretical analysis and numerical simulations. Our findings indicate that optimizing the inner diameter of the ring-shaped ME antenna can elevate the average stress of the magnetic layer, leading to improved radiation performance and bandwidth compared to circular ME antennas. We establish an optimization model for the radiation performance of the ME antenna and conduct shape optimization simulations using COMSOL Multiphysics. The results of the Multiphysics field optimization align with the stress concentration theory, demonstrating a strong correlation between the radiation performance and bandwidth of the ME antenna with the average stress of the magnetic film. The resonant frequency in the thickness vibration mode is determined to be 170 MHz. Furthermore, shape optimization can enhance the bandwidth by up to 104% compared to circular ME antenna structures of the same size.

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“…Numerous studies have been conducted on broadening the bandwidth and enhancing the output response of ME antennas. Yun et al [ 14 ] designed a composite bulk acoustic resonator based on an Mo/AlN/FeGa thin-film stack with different resonant regions to achieve bandwidth enhancement. The work provides an effective method for broadening bandwidth but does not directly enhance the output response within the operating bandwidth of the ME antenna.…”

Section: Introductionmentioning

confidence: 99%

Array Study of VLF Thin-Film Magnetoelectric Antenna with a Microbridge Structure

Jin,

Jing,

Zuo

et al. 2023

Micromachines

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Recently, magnetoelectric (ME) antennas have become a hot topic in the field of antenna miniaturization in the very-low-frequency (VLF) band because their size can be reduced to one-ten-thousandth of the size of conventional electric antennas. However, they still suffer from narrow transmission/reception bandwidth and weak radiation intensity. To address these issues, VLF thin-film ME antennas with a microbridge structure are designed, and the method of array connection is used. Test results show that the detection limit of the ME antenna unit is 636 pT/√Hz at 23 kHz and the radiant magnetic field intensity at 0.12 m is 0.87 nT (input power of 10 mW). By series-connecting three ME antenna units with the same resonance frequency, the output response has been increased to 1.72 times and the EM wave radiation intensity is increased to 1.9 times compared to a single unit. By parallel-connecting two ME antenna units with different resonance frequencies, the output response bandwidth has been expanded to 1.56 times compared to a single unit, and the signal radiation bandwidth has been expanded to 1.47 times. This work provides a valuable reference for the future larger-scale arraying of ME antennas.

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Bandwidth-enhanced magnetoelectric antenna based on composite bulk acoustic resonators

Cited by 17 publications

References 18 publications

Magneto-acoustic coupling: Physics, materials, and devices

Magneto-acoustic coupling: Physics, materials, and devices

Structural Optimization Design of Magnetoelectric Thin-Film Antenna for Bandwidth and Radiation Enhancement

Array Study of VLF Thin-Film Magnetoelectric Antenna with a Microbridge Structure

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