Experimental Study of Bandpass Filter, Tunable in Wide Frequency Range by Electromagnetic System, Containing Samarium Cobalt Permanent Magnets

2020 ◽  
Author(s):  
M.D. Atoev ◽  
R.K. Babichev ◽  
I.I. Natkhin
Keyword(s):  
Experimental Study ◽  
Permanent Magnets ◽  
Bandpass Filter ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Electromagnetic System

Design of multi-layered bandpass filter with independently controllable triple-passband response

2014 ◽  
Vol 6 (6) ◽  
pp. 611-618 ◽  
Author(s):  
Yung-Wei Chen ◽  
Hung-Wei Wu ◽  
Yan-Kuin Su
Keyword(s):  
Frequency Response ◽  
Bandpass Filter ◽  
Bottom Layer ◽  
Wide Frequency Range ◽  
Electromagnetic Simulation ◽  
Frequency Range ◽  
High Isolation ◽  
Full Wave ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new multi-layered triple-passband bandpass filter using embedded and stub-loaded stepped impedance resonators (SIRs) is proposed. The filter is designed to have triple-passband at 1.8, 2.4, and 3.5 GHz. The 1st and 2nd passbands (1.8/2.4 GHz) are simultaneously generated by controlling the impedance and length ratios of the embedded SIRs (on top layer). The 3rd passband (3.5 GHz) is generated by using the stub-loaded SIR (on bottom layer). Using the embedded SIR, the even modes can be tuned within very wide frequency range and without affecting the odd modes. Therefore, the design of multi-band filters with very close passbands can be easily achieved and having a high isolation between the passbands. The filter can provide the multi-path propagation to enhance the frequency response and achieving the compact circuit size. The measured results are in good agreement with the full-wave electromagnetic simulation results.

scholarly journals A Tuned Mass Damper with Nonlinear Magnetic Force for Vibration Suppression with Wide Frequency Range of Offshore Platform under Earthquake Loads

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Qiong Wu ◽  
Wei Zhao ◽  
Weiguo Zhu ◽  
Rencheng Zheng ◽  
Xilu Zhao
Keyword(s):  
High Speed ◽  
Permanent Magnets ◽  
Vibration Suppression ◽  
Wide Frequency Range ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Frequency Range ◽  
Response Characteristics ◽  
Narrow Frequency Band ◽  
Dynamic Performances

Tuned mass dampers (TMDs) are applied to ensure the safety and stability of offshore platforms; however, linear dampers are effective for a single resonance frequency, providing vibration suppression only within a narrow frequency band. Therefore, this paper proposed a magnetic TMD with two pairs of permanent magnets on both sides of the structures, which can generate a nonlinearly repulsive force, making the magnetic TMD reliable and robust in damping the oscillations of structures with wide frequency range under seismic excitations. A comprehensively numerical and experimental study was processed to investigate the dynamic performances of the proposed magnetic TMD, by application of a 1 : 200-scale prototype of the offshore platform. The results verified that the performance of the magnetic TMD can be significantly improved than that of the linear TMD, meanwhile maintaining high-speed response characteristics. The experimental results indicated that the displacement, acceleration, and frequency responses of the offshore platform can be significantly reduced; furthermore, the evaluation indices showed that the magnetic TMD system is credible in reducing the overall vibration levels and maximum peak values.

Balun bandpass filter on slot-line resonators with intrinsic balanced performance in amplitude and phase

2018 ◽  
Vol 10 (8) ◽  
pp. 891-895 ◽  
Author(s):  
Lin-Ping Feng ◽  
Lei Zhu
Keyword(s):  
Bandpass Filter ◽  
Bandpass Filters ◽  
Wide Frequency Range ◽  
Frequency Selectivity ◽  
Good Frequency ◽  
Frequency Range ◽  
Third Order ◽  
Slot Line ◽  
Distinct Field

AbstractIn this paper, a novel class of balun bandpass filters is presented on slot-line resonator (SLR) toward intrinsic balanced performance in amplitude and phase. The proposed balun filter consists of three inductive-coupled SLRs in the middle, one single-ended unbalanced port, and one balanced port with two terminals. According to the distinct field conversion from the slotline to the microstrip feeding line, good balanced performance in amplitude, and phase performance can be intrinsically realized over a wide frequency range. To validate the proposed technique, a prototype third-order balun filter is designed, fabricated, and measured. Both the simulated and measured results have demonstrated that the proposed balun filter can not only achieve good frequency selectivity but also exhibit intrinsic balanced performance in amplitude and phase.

scholarly journals Experimental Study of Raman Spectra of Some Aromatic Hydrocarbons

2020 ◽  
Vol 65 (4) ◽  
pp. 284
Author(s):  
B. Eshchanov ◽  
Sh. Otajonov ◽  
G. Mukhamedov ◽  
I. Doroshenko ◽  
O. Karpova ◽  
...  
Keyword(s):  
Experimental Study ◽  
Aromatic Hydrocarbons ◽  
Low Frequency ◽  
Semiempirical Method ◽  
Wide Frequency Range ◽  
Torsional Vibrations ◽  
Benzene Derivatives ◽  
Frequency Range ◽  
Frequency Spectra ◽  
Potential Barriers

The vibrational spectra of liquid aromatic hydrocarbons – bromobenzene, dioxane, toluene – are studied in a wide frequency range by means of Raman spectroscopy. The manifestation of torsional vibrations of individual groups of atoms is established from the obtained data on the low-frequency spectra. The possibility of using a semiempirical method for calculating the potential barriers of methyl and halide groups in benzene derivatives is shown.

VIBRATION CHARACTERISTICS OF THE DAMPER ELEMENT COMPOSED OF ANNULAR MAGNETS AND MAGNETIC FLUID

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1520-1526 ◽  
Author(s):  
S. SUDO ◽  
A. NAKAGAWA
Keyword(s):  
Magnetic Fluid ◽  
Vibration Amplitude ◽  
Permanent Magnets ◽  
Wide Frequency Range ◽  
Vibration Characteristics ◽  
Testing System ◽  
Frequency Range ◽  
Vibration Testing ◽  
Fluid System ◽  
Optical Displacement

This paper is concerned with the development of a damper with excellent characteristics. The vibration characteristics of the damper element composed of two annular permanent magnets and magnetic fluid are studied experimentally using a vibration testing system. The vibration amplitude of the upper magnet-magnetic fluid system is measured with an optical displacement detector system. It was found that the element of two annular permanent magnets adsorbed magnetic fluid is very effective over the wide frequency range.

scholarly journals Radiating Slot in the Coaxial Cable Shield: Measurement Based Characterization

2015 ◽  
Vol 11 (3) ◽  
pp. 136
Author(s):  
Antonio Šarolić ◽  
Zlatko Živković ◽  
Damir Senić ◽  
Niko Ištuk
Keyword(s):  
Experimental Study ◽  
Electric Field ◽  
Communication Systems ◽  
Wide Frequency Range ◽  
Coaxial Cable ◽  
Wireless Communication Systems ◽  
Frequency Range ◽  
Radiation Characteristics ◽  
Orthogonal Components ◽  
The Common

The paper presents the comprehensive experimental study of radiation characteristics of a single slot in a coaxial cable shield. The slot was realized in four different embodiments, which varied by slot orientation and length. Three orthogonal polarizations of radiated electric field were analyzed along the axis perpendicular to cable, broadside to the slot, in a broadband frequency range (80-1000 MHz). The analysis was based on thorough measurements of the coupling loss, which is the common parameter for the leaky cable characterization. The obtained results showed that the electric field component longitudinal to the cable axis considerably dominates over other two orthogonal components, for all four slot types. Doubling the length of the slot caused a ca. 20 dB increase of the radiated field. Different slot orientations, having the same length in the cross-section projection, yielded approximately equal field strengths. The results of this experimental study clearly and visibly demonstrate the radiating slot field dependence on polarization and slot geometry in a wide frequency range. Thus they are useful for planning of wireless communication systems based on radiating cables, as well as for understanding polarization related issues in such systems.

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