Pakasiri, Chatrpol

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Pakasiri, Chatrpol
Alternative Name
Pakasiri, Charpol
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Email
chatrpol.pa@kmitl.ac.th

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    Item type:Publication,
    A UHF compact complex impedance-transforming balun with high isolation
    (2020-01-01)
    Nithiporndecha, Kittipong
    ;
    Pakasiri, Chatrpol
    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 iso-lation, 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 Z<inf>s</inf> = 12-j12Ω and the load impedances at port 2 and 3 were set at Z<inf>L</inf> = 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.
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    Item type:Publication,
    A 433 MHz compact complex impedance-Transforming balun
    (2017-12-19)
    Pakasiri, Charpol
    ;
    Nithiporndecha, Kittipong
    A 433 MHz compact size balun that can transform a complex source impedance value to a complex load impedance value is demonstrated. The balun design is based on a coupled-line coupler balun. The simulation shows a good performance at 433 MHz operating frequency.