Research on mechanism and key technology of mechanical antenna for a low-frequency transmission

Zhou, Qiang; Yao, Fuqiang; Shi, Wei; Hao, Zhenyang; Zheng, Huifeng; Liu, Bin; He, Panfeng

doi:10.1360/sst-2019-0118

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…[2,13,14] In contrast to the most widely used dipole antenna, mechanical antennas that function through the coupling of the electromagnetic field by using the mechanical movement of charge or magnetic dipole have gained prominence. [3,[15][16][17][18] One approach to achieve a mechanical antenna is to physically rotate or vibrate a permanent electret. It is worth noting that antennas based on the motor driven electret exhibits favorable extremely low frequency (0-200 Hz) band radioactive performance with significantly reduce of the size.…”

Section: Introductionmentioning

confidence: 99%

Magneto‐Mechano‐Electric Antenna for Portable VLF Transmission

Jiang

Liu

et al. 2023

Adv Elect Materials

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Wireless communication has always been an indispensable element in the modern information‐based society. Beyond the commercial electrical antenna, very low frequency (VLF) mechanical antennas have recently become research hotspot since their combination of miniaturization and favorable radiation efficiency in lossy electrically conductive environments. However, their usage is challenged due to the relatively limited radiation capability and modulation bandwidth. This study demonstrates an improved high‐efficiency magnetoelectric (ME) mechanical antenna based on the magneto‐mechano‐electric (MME) effect, realized via the synergistic effect of piezo‐driven magnets motion and converse magnetoelectricity (ME). Converse ME coefficient and radiation measurement show that the MME antenna demonstrates superior performance over a normal ME antenna. The oscillation magnet serves as an extra vibrating magnetic dipole besides the ME composite and thus brings radiation enhancement to the mechanical antenna. Furthermore, digital signal modulations are conducted with a VLF carrier signal to enable anti‐interference and anti‐attenuation communication. In view of the exemplary demonstration, the MME effect‐based antenna is expected to provide a new strategy for mechanical antenna improvement and shows tremendous potential for conductive environments communication applications.

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Section: Introductionmentioning

confidence: 99%

Magneto‐Mechano‐Electric Antenna for Portable VLF Transmission

Jiang

Liu

et al. 2023

Adv Elect Materials

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“…Compared to mechanical antennas based on permanent magnets (magnetic dipoles) or piezoelectric materials (electrical dipoles), electret-based mechanical antennas (EBMAs) have higher radiation efficiency and are more advantageous in long-distance radiation 14 – 16 . Specifically, electrets are used as carriers of net electrostatic charges.…”

Section: Introductionmentioning

confidence: 99%

A miniaturized mechanical antenna based on FEP/THV unipolar electrets for extremely low frequency transmission

Cui

Li³

et al. 2022

Microsyst Nanoeng

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An electret-based mechanical antenna (EBMA), which can transmit extremely low frequency (ELF) electromagnetic signals, has the advantages of miniaturization and high transmitting efficiency, with great potential applications in air, underwater, and underground communications. To improve the charge density of the electret, which is a key factor in determining the radiation performance of an EBMA, this work proposes a fluorinated ethylene propylene/terpolymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (FEP/THV) unipolar electret exhibiting negative polarity, reaching a total charge density up to −0.46 mC/m2 for each layer of electret. Long transmission distances can be achieved in sea water, soil, and air using a 3-layer-FEP/THV-based EBMA with a compact volume of 5 × 10−4 m3. As an application demonstration, binary ASCII-coded ELF information of “BUAA” is successfully transmitted with a power consumption < 5 W.

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“…To solve the above problems, the US Defense Advanced Research Projects Agency (DARPA) put forward the concept of the mechanical antenna (MA) in December 2016 and launched the AMEBA (a mechanically based antenna) project in August 2017 [10]. It is a new low-frequency electromagnetic transmitting technology that directly excites electromagnetic waves through the mechanical movement of special materials (such as electrets or permanent magnets) [11][12][13][14]. Bene ting from the mature application of rare Earth permanent magnet materials [15] and rotating drive technology [16] in various elds, the rotating magnet-based MA (RMBMA) attracts domestic and foreign attention.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Transmission Characteristics on an MSK-Based Rotating Magnet-Based Mechanical Antenna

Zhou

Zhang

2022

International Journal of Antennas and Propagation

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A rotating magnet-based mechanical antenna (RMBMA) is a new promising paradigm which can significantly reduce both the size and the power consumption of the super-low frequency electromagnetic transmitter. To further reveal the effects of the rotational motion on transmission, this paper investigates the performance analysis of MSK (Minimum Shift Keying)-based RMBMA for the first time. Initially, based on the framework of MSK-based RMBMA, both the information loading of RMBMA and the control strategies of the motor are proposed, such that the impacts of the step response induced by the motor on the information loading are characterized. Then, the transmission capacity of the MSK-based RMBMA is derived in the closed form. The results indicate that increasing output torque or decreasing inertia load can enhance the transmission capacity. Finally, numerical simulations using a realistic system model demonstrate the validity of the proposed performance analysis. The simulation results show that when the inertia is less than 0.0128 kg∙m2 and the symbol rate is less than 4 bit/s, the bit error rate is less than 10%, thereby improving the transmission capacity. The proposed comprehensive design principles of RMBMA provide guidance for system design and practical implementation.

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Research on mechanism and key technology of mechanical antenna for a low-frequency transmission

Abstract: Low-frequency wide-band hybrid energy harvester based on piezoelectric and triboelectric mechanism

Cited by 21 publications

References 11 publications

Magneto‐Mechano‐Electric Antenna for Portable VLF Transmission

Magneto‐Mechano‐Electric Antenna for Portable VLF Transmission

A miniaturized mechanical antenna based on FEP/THV unipolar electrets for extremely low frequency transmission

Analysis of Transmission Characteristics on an MSK-Based Rotating Magnet-Based Mechanical Antenna

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