• Journal of Digital Convergence
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• v.12 no.4
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• pp.343-348
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• 2014

This paper suggested a theoretical approach and an implementation for the design of an unequal Wilkinson power divider with a high dividing ratio operating at two-frequencies. The T-section transmission lines and the two-section of Monzon's theory are proposed to operate a dual-band application. To achieve the high dividing ratio divider, the high impedance line using a T-shaped structure and low impedance lines with periodic shunt open stubs are implemented. For the validation of this divider, a dual-band power divider with a high dividing ratio of 5 is simulated and measured at 1 GHz and 2 GHz. The measured performances of the divider are in good agreements with simulation results.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.6 s.97
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• pp.594-602
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• 2005

In this paper, a new type of 5-pole low pass filter(LPF) having defected ground structure(DGS) and very wide transmission line elements is proposed. The previously presented design method of 3-stage LPF using DGS is generalized to design N-pole LPFs for $N\geq5$. As an example, a 5-pole LPF having DGS is designed and measured. The accurate curve-fitting method to determine the series inductors in the prototype filter, and ultimately the size of DGS is described. The proposed 5-pole LPF has transmission line elements with a very low impedance to realize the required shunt capacitance instead of open stubs. Therefore, open stub. Therefore, open stub, Tee-junction, Cross-junction, and high impedance line are not required for the proposed LPF, while they all have been essential in conventional LPFs.