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Frequency response

About: Frequency response is a research topic. Over the lifetime, 25705 publications have been published within this topic receiving 332249 citations.


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TL;DR: In this paper, it is shown that the corresponding response of an associated conductive or dielectric system may be immediately obtained through the use of new duality relations. But the authors do not consider the relationship between the activation energy probability density and the activation frequency response.
Abstract: When the small‐signal ac frequency response of a dielectric or conductive system is known, either functionally or as data, it is shown that the corresponding response of an associated conductive or dielectric system may be immediately obtained through the use of new duality relations. A specific model is considered which involves thermally activated capacitance and/or resistance, with an activation energy probability density exponentially dependent on energy. Previous frequency response analyses of such a continuously distributed model involve inadequate approximations and lead to erroneous predictions. Correct immittance results are presented in three ways: analytically, by means of complex plane plots, and through the use of three‐dimensional perspective plots. Results are given in general form but apply to both dielectric and conductive systems which involve the same functional dependence on activation energies. Low‐ and high‐frequency‐limiting responses for a given system are found to be associated wi...

106 citations

Journal ArticleDOI
TL;DR: In this article, the frequency response of a semiconductor distributed feedback (DFB) laser under optical injection locking has been studied experimentally and it is shown that strong injection locking is very effective at increasing the relaxation oscillation frequency of DFB lasers.
Abstract: The frequency response of a semiconductor distributed feedback (DFB) laser under optical injection locking has been studied experimentally. It is shown that strong injection locking is very effective at increasing the relaxation oscillation frequency of DFB lasers. Bandwidth enhancement as high as 3.7 times has been achieved for the first time.

106 citations

Journal ArticleDOI
TL;DR: In this article, a two-by-two transmission matrix is derived for the acoustic wave amplitudes at the input and output of a surface wave grating, and the external transmission through a saw resonator is found by matrix multiplication.
Abstract: Coupled Surface-Acoustic-Wave (saw) grating resonators are investigated analytically with a transmission-matrix technique, and the measured frequency responses at ∼145 MHz of devices on YZ-LiNbO 3 with Ti-diffused gratings are compared with the theoretical results. Coupled-mode theory is applied to derive the two-by-two transmission matrix relating the acoustic wave amplitudes at the input and output of a surface wave grating. Using the transmission matrices, the external transmission through a saw resonator is found by matrix multiplication. Some fundamental aspects of resonator passband synthesis are introduced by considering the transmission through several acoustically cascaded resonators. Resonator filters where the transducers couple directly to the resonant cavities are treated by developing a description of the transducer that is compatible with the transmission matrix of the grating. The analysis technique is then applied to the familiar two-port resonator-filter. Next, coupled resonator-pairs with a transducer in each cavity are considered in detail for: (i) collinear acoustic coupling, (ii) multistrip coupling, and (iii) transducer coupling. Experimental results are presented for each configuration considered and good agreement with the analytical description is found in each case.

106 citations

Journal ArticleDOI
TL;DR: A new type of resonant-mass gravitational wave detector is proposed, a truncated icosahedral gravitational wave antenna that will be omnidirectional, and able to measure the direction and polarization of a detected wave.
Abstract: We propose a new type of resonant-mass gravitational wave detector, a truncated icosahedral gravitational wave antenna. It will be omnidirectional, and able to measure the direction and polarization of a detected wave. We solve a model for this system, calculate the strain noise spectrum, and conclude that its angle-averaged energy sensitivity will be 56 times better than the equivalent bar-type antenna with the same noise temperature.

106 citations

Journal ArticleDOI
TL;DR: In this paper, a frequency-domain piezoaeroelastic modeling and analysis of a cantilevered plate-like wing with embedded piezoceramics is presented for energy harvesting.
Abstract: Multifunctional structures are pointed out as an important technology for the design of aircraft with volume, mass, and energy source limitations such as unmanned air vehicles (UAVs) and micro air vehicles (MAVs). In addition to its primary function of bearing aerodynamic loads, the wing/spar structure of an UAV or a MAV with embedded piezoceramics can provide an extra electrical energy source based on the concept of vibration energy harvesting to power small and wireless electronic components. Aeroelastic vibrations of a lifting surface can be converted into electricity using piezoelectric transduction. In this paper, frequency-domain piezoaeroelastic modeling and analysis of a cantilevered platelike wing with embedded piezoceramics is presented for energy harvesting. The electromechanical finite-element plate model is based on the thin-plate (Kirchhoff) assumptions while the unsteady aerodynamic model uses the doublet-lattice method. The electromechanical and aerodynamic models are combined to obtain the piezoaeroelastic equations, which are solved using a p-k scheme that accounts for the electromechanical coupling. The evolution of the aerodynamic damping and the frequency of each mode are obtained with changing airflow speed for a given electrical circuit. Expressions for piezoaeroelastically coupled frequency response functions (voltage, current, and electrical power as well the vibratory motion) are also defined by combining flow excitation with harmonic base excitation. Hence, piezoaeroelastic evolution can be investigated in frequency domain for different airflow speeds and electrical boundary conditions.

106 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023154
2022389
2021857
20201,105
20191,212
20181,152