scholarly journals Effects of Parasitic Resistances on Π-source Impedance Network

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Chi-Fong Ieong ◽  
Chio-Hong Leong ◽  
Xiangfei Kong ◽  
Chi-Kong Wong ◽  
Chi-Seng Lam
Keyword(s):  
Source Impedance

A UHF Compact Complex Impedance-transforming Balun with High Isolation

2020 ◽  
Vol 13 (8) ◽  
pp. 1135-1144
Author(s):  
Kittipong Nithiporndecha ◽  
Chatrpol Pakasiri
Keyword(s):  
Complex Impedance ◽  
Output Port ◽  
Reflection Coefficients ◽  
Coupled Line ◽  
High Isolation ◽  
Line Structure ◽  
Source Impedance ◽  
Phase Balance ◽  
High Output

Background: A compact complex impedance-transforming balun for UHF frequencies, which is based on a coupled-line structure that matched all ports and provided high output port isolation, was designed in this paper. Methods: A lumped component transformation was used to minimize circuit size. The implemented circuit operated at 433 MHz with the reflection coefficients less than -16 dB at all ports, 0.22 dB amplitude balance and 180° phase balance at the output ports. The signal coupling between the output ports was -16.8 dB. The circuit size is small at 0.032λ. Results: Complex impedance-transforming baluns were designed to operate at 433 MHz. The source impedance at port 1 was set at Zs = 12 - j12Ω and the load impedances at port 2 and 3 were set at ZL = 80 + j30Ω. Conclusion: A compact complex impedance-transforming balun at UHF frequency, with all ports matched and high isolations, was designed and illustrated in this paper.

scholarly journals Reduction of Harmonics Cause of Inrush Current for Transformer

2020 ◽  
Vol 9 (5) ◽  
pp. 1-4
Keyword(s):  
Voltage Drop ◽  
Inrush Current ◽  
Source Impedance ◽  
Different Types ◽  
Current Reduction ◽  
Switching Method ◽  
The Impact ◽  
Transformer Core ◽  
Secondary Winding ◽  
Sequential Switching

Due to the impact of inrush current of transformer, made a voltage drop by source impedance as well as by sensitive loads. That’s why, necessary action is required to reduce the inrush current. Many factors like, secondary winding load, material of transformer core, Saturation flux/residual flux of transformer core, capacity of transformer, supply impedance, voltage-starting phase angle, are affecting the inrush current of transformer. Some different types of methods for inrush current reduction are listed in this paper. Out of that, sequential switching method is adopted for the reduction inrush current.

Measurement of the source impedance of conducted emission using mode separable LISN: Conducted emission of a switching power supply

2002 ◽  
Vol 139 (2) ◽  
pp. 72-78 ◽  
Author(s):  
Junichi Miyashita ◽  
Masayuki Mitsuzawa ◽  
Toshiyuki Karube ◽  
Kiyohito Yamasawa ◽  
Toshiro Sato
Keyword(s):  
Power Supply ◽  
Switching Power Supply ◽  
Switching Power ◽  
Source Impedance ◽  
Conducted Emission
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