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http://dx.doi.org/10.6109/jkiice.2021.25.10.1409

Gysel 3:1 variable power divider using the dual characteristic impedance transmission line  

Park, Ung-hee (Division of Electronics, Information & Communication Engineering, Kangwon University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.25, no.10, 2021 , pp. 1409-1415 More about this Journal
Abstract
The Gysel divider has the advantage of easily setting the resistor in the circuit. If the line impedance in the Gysel divider is set differently, the input signal can be distributed to the two output ports at various distribution ratios. This paper proposes the Gysel divider that can change the power distribution to 1:3 or 3:1 by changing the line impedance. The impedance change of the line can be implemented by placing a floating copper plate on the bottom of the microstrip-line. When the floating copper plate and the ground plane are connected, the line operates as the microstrip-line, and when the floating copper plate and the ground plane are disconnected, the line operates as the coplanar-line. The proposed Gysel divider was fabricated at the center frequency of 1.5GHz. The fabricated 3:1 Gysel divider has a stable value S11 of below -17dB, S21/S31 of 4.8±0.2dB, S21(to high output port) of -1.39±0.12dB and S31(to low output port) of -6.15±0.08dB over 1.3~1.7GHz.
Keywords
Coplanar line; Dual impedance transmission line; Gysel power divider; Variable power divider; Variable transmission line;
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