Abstract-A novel 180• out-of-phase power divider with complex-source to complex-load impedance transformation and high power-handling capability is proposed in this paper. It is composed of three double-sided parallel-strip lines (DSPSLs), a conduct plane in the middle as common ground, and two resistors for heat sinking and high isolation. Based on the rigorous odd-and even-mode analytical methods, closed-form design equations about electrical parameters are obtained. To demonstrate our design theory, a practical three-layer out-of-phase power divider is designed, simulated and measured. The measured results show that the return losses |S ii | (i = 1, 2, and 3) are all larger than 17 dB. The insertion loss |S 21 |(|S 31 |) is 3.6 dB (3.7 dB). The isolation |S 23 | is −24 dB, and the output phase difference is −177 • at the operating frequency. Good agreements between the simulated and measured results verify our design theory.
A symmetrical two-way Wilkinson power divider with shifted output ports, much wide bandwidth and large frequency-ratio is proposed for dual-band application. The corresponding transcendental design equations are derived by using the even-and odd-mode analysis. Moreover, the closed-form scattering parameter expressions are derived. Transcendental design equations are solved and accurate numerical design parameters along with different frequency ratios are obtained. Finally, the proposed structure and design method are validated by simulated and experimental results of typical microstrip planar power dividers, the performance is clearly observed for the input and output matching, isolation and transmission characteristic very well at the two band frequencies. More specifically, the measured transmission characteristics of the divider are 3.11 dB/3.58 dB at the 1.0 GHz/3.5 GHz, respectively.
Abstract-In this paper, coupled lines are used in the design of a dual band planar multi-way Bagley polygon power divider to reduce the size is proposed. For the input port matching and transmission characters are affected by the even mode impedance only, analysis of the multi-way Bagley polygon power divider and equivalent circuit based on coupled lines, closed form design equations are presented with even mode impedance, and odd mode impedance is obtained arbitrarily. To validate the design procedure, two dual band threeway Bagley polygon power dividers are designed, simulated, and fabricated using coupled lines with areas of 3.17 cm 2 and 2.53 cm 2 , and the corresponding conventional divider with areas of 17.86 cm 2 and 11.74 cm 2 , respectively. When coupled lines are used, the layout is more compact with a reduction in size of more than nearly 80% compared to the conventional design.
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