scholarly journals Theoretical and Empirical Verification of Electrical Impedance Matching Method for High-Power Transducers

Electronics ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 194
Author(s):  
Jungwoo Lee ◽  
Jinhyuk Kim
Keyword(s):  
Resonance Frequency ◽  
High Power ◽  
Acoustic Pressure ◽  
Impedance Matching ◽  
Matching Condition ◽  
Actual Behavior ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Series Inductor

In our prior study, a systematic approach was used to devise Langevin transducers for high-power applications where the energy efficiency was not considered in the design criteria. In this paper, the impedance matching methods are thus proposed to evaluate what matching topology is appropriate for their use. Both the series inductor scheme and low pass filter composed of a series inductor and shunt capacitor are examined as matching circuits. According to MATLAB simulation, the resonance frequency is seen at 36.79 kHz due to a series L circuit, and its associated impedance is reduced by 70.45% from that of its non-matching condition. The measured resonance frequency is 36.77 kHz and the corresponding impedance is decreased by 59.52%. Furthermore, the acoustic pressure is measured to determine the effect of the matching circuit on the transducer’s actual behavior. The transducer with a series L circuit shows more efficient matching results, 2.28 kPa of positive acoustic pressure is emitted without matching and 3.35 kPa is emitted with a series L element, respectively. As a result, this study demonstrates how to evaluate the influence of matching circuits by using our customized approach rather than commercial SPICE programs, as well as how to experimentally verify the acoustic behavior of high-power Langevin transducers.

Selectivity and in-band impedance enhancement of a compact slot antenna with defected ground structures

2019 ◽  
Vol 11 (10) ◽  
pp. 1010-1016
Author(s):  
Hailong Yang ◽  
Xiaoli Xi ◽  
Lili Wang ◽  
Yuchen Zhao ◽  
Xiaomin Shi
Keyword(s):  
Reflection Coefficient ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Band Edge ◽  
Slot Antenna ◽  
Defected Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Uwb Antennas ◽  
Low Pass

AbstractIn this study, a new ultra-wideband (UWB) band-edge selectivity antenna with a modified radiation slot using defected ground structure (DGS) is presented to obtain bandpass filtering reflection coefficient and gain performance. The well-designed DGS is designed on backside metallic of the substrate and can be seen as a low-pass filter that provides a good roll-off at a higher frequency. By connecting the DGS and the stepped slot and making them merge with each other, good cut-off property in the upper passband and better in-band impedance characteristics are obtained. Measured results show that the proposed design not only shows good band-edge selectivity in reflection coefficient and gain performance but also has a good impedance matching of −13.5 dB reflection coefficients and a good radiation efficiency of 90% in the operating frequencies. The measured bandwidth defined with the reflection coefficient less than −10 dB is from 3.1–11.2 GHz. Furthermore, the size of the filtering UWB antenna is 22 mm × 12 mm, which is smaller than many individual UWB antennas and UWB filters.

scholarly journals Simultaneous Design of Low-Pass Filter with Impedance Matching Transformer for SONAR Transducer Using Particle Swarm Optimization

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4646
Author(s):  
Jae-Hyuk Choi ◽  
Hyung-Soo Mok
Keyword(s):  
Particle Swarm Optimization ◽  
Impedance Matching ◽  
Particle Swarm ◽  
Acoustic Signals ◽  
Design Methods ◽  
Swarm Optimization ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Simultaneous Design ◽  
Low Pass

Sound navigation and ranging (SONAR) systems detect a target in the front direction by using acoustic signals. A switching-type power conversion system is used to improve power efficiency, and an impedance matching circuit is used to decrease reactive power. A low-pass filter is used to improve the quality of acoustic signals. To achieve the desired voltage level for a SONAR transducer, a transformer is connected in series with a low-pass filter. In conventional design methods, design value errors occur because the components are designed independently and later combined. Moreover, if parameters that considerably impact operating characteristics are ignored in the design process, these errors will increase. Hence, time and cost losses are incurred during refabrication because operational characteristics differ from design values. To solve this problem, this study proposes the simultaneous design of a low-pass filter and impedance matching circuit, which includes critical design parameters, utilizing the particle swarm optimization algorithm. Moreover, conventional design methods were examined, and the superiority of the proposed design method to conventional methods was verified through analyses and experiments in terms of overall impedance phase and filter blocking characteristics.

Thermal analysis, design, and implementation of an L‐band high‐power stepped impedance low‐pass filter

2020 ◽  
Vol 48 (12) ◽  
pp. 2078-2096
Author(s):  
Zohre Pourgholamhossein ◽  
Gholamreza Askari ◽  
Fattah Talaei ◽  
Hamid Mirmohammad Sadeghi
Keyword(s):  
Thermal Analysis ◽  
High Power ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Design And Implementation ◽  
Low Pass ◽  
Analysis Design ◽  
L Band

scholarly journals Design of a compact low pass filter for high power RF generators

2013 ◽  
Vol 10 (2) ◽  
pp. 20120956-20120956
Author(s):  
Jaesu Park ◽  
Jaehoon Choi
Keyword(s):  
High Power ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Design and implementation of a practical semi-lumped high power low-pass filter

2014 ◽  
Vol 24 (5) ◽  
pp. 605-614 ◽  
Author(s):  
Zohre Pourgholamhossein ◽  
Gholamreza Askari ◽  
Maziar Hedayati ◽  
Hamid Mirmohammad Sadeghi
Keyword(s):  
High Power ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Design And Implementation ◽  
Low Pass

DESIGN OF BESSEL LOW PASS FILTER USING DGS WITH IMPROVED CHARACTERISTICS FOR RF/MICROWAVE APPLICATIONS

2014 ◽  
Vol 23 (09) ◽  
pp. 1450122 ◽  
Author(s):  
Ashwani Kumar ◽  
A. K. Verma ◽  
Nainu P. Chaudhari
Keyword(s):  
High Speed ◽  
Impedance Matching ◽  
Data Communication ◽  
Synthesis Process ◽  
Defected Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
High Speed Data ◽  
Improved Performance

We report a synthesis process to design the defected ground structure (DGS)-based Bessel lowpass filter (LPF). For 5-pole LPF at fc = 2.5 GHz, its selectivity is 10.6 dB/GHz and for the DGS-based Butterworth LPF it is 12.6 dB/GHz. For the lumped elements Bessel LPF, it is only 4.84 dB/GHz. Its 20 dB rejection bandwidth is 13.1 GHz and impedance matching BW is 76%, as against 88.8% for Butterworth LPF. At fc = 7.5 GHz, the 5-pole DGS Bessel LPF has selectivity 7 dB/GHz, 20 dB rejection BW is 13 GHz and 10 dB return loss (RL) BW in passband is 4.86 GHz (64.8%) with less than 7.9 pS group delay (GD) variation. In case of a bulky mixed microstrip-waveguide (MMW) 5-pole Bessel LPF at 7.5 GHz [W. Menzel and F. Boigelsack, 29th European Microwave Conference, Munich (1999), pp. 191–194.], reported results are: sharpness of cut-off 1.48 dB/GHz, 10 dB RL BW and GD variation are 48% and 4 pS, respectively. The improved performance the DGS-based Bessel LPF can find applications in high speed data communication, front-end of a wideband communication system and in a power amplifier, by improving the selectivity, suppression of harmonics and linear distortion.

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