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A modified Wilkinson Power Divider is proposed in this paper that utilizes defected ground structure (DGS) in parallel with an isolation resistor. The proposed DGS section is incorporated between the output ports, and the isolation resistor is soldered in parallel with the DGS in the ground plane, instead of on the top plane as in a conventional Wilkinson power divider, to achieve improved or preferable isolation. The proposed design is comprised of two pairs of microstrip transmission lines with equal impedances and varied electrical lengths. The parameters of the main circuit and the DGS section are acquired separately. The parameters of the proposed main circuit are derived by applying conjugate matching theory. Dumbbell-shaped DGS is introduced in the ground plane between the output ports, which acts as a parallel resonator, yielding an attenuation pole at the resonant frequency that contributes to improved isolation. By applying the previous well-known circuit theory, the lumped elements of the equivalent circuit of the DGS were achieved. The physical dimensions of the equivalent circuit for the DGS section were obtained by three-dimensional EM simulation. The measured results show improved isolation, return loss and better bandwidth as compared with other similar works. Furthermore, the proposed circuits designed at resonating frequencies of 3 and 2 GHz presented comparatively good return losses, S 11 of about −25.54 and −31.24 dB, respectively, and achieved improved isolations, S 32 between the output ports, in an order of about −40.83 and −36.05 dB, respectively, which is rather exceptional and desirable. [ABSTRACT FROM AUTHOR]

Abstract: A wideband Wilkinson power divider using parallel LC resonant circuit is proposed for different phase output differences. The design theory of the wideband power divider is derived by making the difference between the slopes of the added line for phase shift and the slopes of parallel LC resonant circuit constant zero, and then, the formula is used to find the value L and C. For easy fabrication, the lumped element L and C are implemented as the shunt stub of distributed element. The proposed circuit on Rogers RT 5880 is designed and measured to verify the new design concept. For accurate comparison, the phase shift line of the conventional Wilkinson power divider is added to one of output ports, and the proposed circuit is fabricated with 45° and 90° power divider at 1.5 GHz central frequency. The fractional bandwidth of the proposed 45° and 90° power divider in case of ±10° phase deviation is over 120% and 100%, respectively. Therefore, the measured results are in good agreement with the design method, and the proposed one will be much smaller size than 90° or 180° hybrid couplers. The proposed Wilkin‐ son power divider will be applicable for phase shifter and various microwave circuits. [ABSTRACT FROM AUTHOR]

ABSTRACT In this article, we suggest a new design method of the unequal Wilkinson power divider. The line impedances of the proposed formula are decided after the resistor value is arbitrarily chosen, while the isolation resistor of the conventional unequal Wilkinson power divider is derived by the power ratio. Therefore, using the proposed formula, the more accurate resistor value is applicable to the Wilkinson power divider, and a narrow line width is improved up to 46.5% in 10:1 Wilkinson power divider. The proposed design formula of the Wilkinson power divider is derived, and the proposed formula is verified by the fabrication and measurement results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2450-2452, 2016 [ABSTRACT FROM AUTHOR]