A Mechanical Antenna With Frequency Multiplication and Phase Modulation Capability

Barani, Navid; Kashanianfard, Mani; Sarabandi, Kamal

doi:10.1109/tap.2020.3044385

Cited by 12 publications

(8 citation statements)

References 29 publications

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“…Eq. ( 4) to (7), equations can be formed. The l 0 , which determines the delay and phase change of the RE signal, can be calculated.…”

Section: Design and Test Results Of Unequal-length Cablesmentioning

confidence: 99%

Low-frequency Signal Generation in Space Based on the High-frequency Electric Antenna Array and Doppler effect

cui

et al. 2022

Preprint

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Low-frequency signals can be used in target detection and geological exploration, but the large antenna sizes limit their applications. Hence, it is significant to investigate the low-frequency signal generation method based on antennas with appropriate sizes. Different from mechanical antenna methods, previous work of this paper proposes a novel low-frequency signal generation method in space on the basis of Doppler effect, and designs the high-frequency electric antenna staggered array and timing sequency of the periodic pulse train signal. In this paper, 8-element short-array and 64-element long-array experimental prototypes are proposed, and the 121.35 MHz signal is composed of 156 MHz radiating element signals. Experimental results show that the measured composite signal spectrums are similar to the simulations and physically verify the feasibility of the low-frequency signal generation method based on the high-frequency electric antenna array, which is valuable in the area of low-frequency signal generation with small antennas.

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“…Eq. ( 4) to (7), equations can be formed. The l 0 , which determines the delay and phase change of the RE signal, can be calculated.…”

Section: Design and Test Results Of Unequal-length Cablesmentioning

confidence: 99%

Low-frequency Signal Generation in Space Based on the High-frequency Electric Antenna Array and Doppler effect

cui

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…Any vibrating (accelerating) charge radiates EM waves at frequencies related to the charge's motion dependent on the natural mechanical resonances of the nanofibrils. Therefore, charged amyloid nanofibrils may play the role of mechanical antennas within biofilms [36]. Due to the small dimensions and large molecular mass of cells and amyloids, the fields generated by such motions are expected to fall within radio frequencies, rather than the typical atomic oscillations that fall into optical and infrared ranges.…”

Section: B Source Of Em Emissionmentioning

confidence: 99%

“…1(c), the nanoscale nanofibrils are either suspended within the biofilm environment or attached to the cell wall. We contend that the charged nanofibrils can vibrate due to thermal motions, variable stresses and potentially due to some metabolic processes and consequently they radiate detectable EM waves [36]. Thus, amyloid nanofibrils potentially play a role as nanoscale antennas capable of emitting and receiving the EM signals replicating some of the metallic and semiconducting assemblies [37].…”

Section: Introductionmentioning

confidence: 99%

A Multiphysics Modeling of Electromagnetic Signaling Phenomena at kHz-GHz Frequencies in Bacterial Biofilms

et al. 2022

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This paper presents a model that describes a possible mechanism for electromagnetic (EM) signal transmission and reception by bacterial cells within their biofilm communities. Bacterial cells in biofilms are embedded into a complex extracellular matrix containing, among other components, charged helical nanofibrils from amyloid-forming peptides. Based on the current knowledge about the nanoscale structure and dynamics of the amyloids, we explore a hypothetical model that the mechanical vibration of these nanofibrils allows the cells to transmit EM signals to their neighboring cells and the surrounding environment. For the reception, the induced electric field can either exert force on the charges of adjacent nanofibrils associated with the neighboring cells or affect the placement/conformation of a certain charged messenger protein within the cell. The proposed model is based on a coupled system of electrical and mechanical nanoscale structures, which predicts signal transmission and reception within kHz-GHz frequency ranges. Different mechanisms for generating EM signals at various frequency bands related to the structure of the cell and their biofilm constituents are discussed.

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“…Moreover, an increasing number of studies have identified modes of membrane-adjacent structures. For example, functional amyloid fibers, proteinaceous fibers that grow in biofilm and anchor to the bacterial membranes, have been suggested to mechanically vibrate and deliver a damped vibrational signal to an adjacent bacterial cell [ 24 , 25 , 26 ]. Electromagnetic signals on the order of kHz of bacterial DNA that match DNA extracted from Alzheimer’s and other amyloid-induced diseased patients [ 27 ] suggest that bacterial infections are present in such illnesses.…”

Section: Introductionmentioning

confidence: 99%

Low-THz Vibrations of Biological Membranes

et al. 2023

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A growing body of work has linked key biological activities to the mechanical properties of cellular membranes, and as a means of identification. Here, we present a computational approach to simulate and compare the vibrational spectra in the low- THz region for mammalian and bacterial membranes, investigating the effect of membrane asymmetry and composition, as well as the conserved frequencies of a specific cell. We find that asymmetry does not impact the vibrational spectra, and the impact of sterols depends on the mobility of the components of the membrane. We demonstrate that vibrational spectra can be used to distinguish between membranes and, therefore, could be used in identification of different organisms. The method presented, here, can be immediately extended to other biological structures (e.g., amyloid fibers, polysaccharides, and protein-ligand structures) in order to fingerprint and understand vibrations of numerous biologically-relevant nanoscale structures.

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A Mechanical Antenna With Frequency Multiplication and Phase Modulation Capability

Cited by 12 publications

References 29 publications

Low-frequency Signal Generation in Space Based on the High-frequency Electric Antenna Array and Doppler effect

Low-frequency Signal Generation in Space Based on the High-frequency Electric Antenna Array and Doppler effect

A Multiphysics Modeling of Electromagnetic Signaling Phenomena at kHz-GHz Frequencies in Bacterial Biofilms

Low-THz Vibrations of Biological Membranes

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