In this paper, one kind of miniaturized Gysel power divider (GPD) with ninth harmonic suppression is proposed. In this structure to weaken unwanted harmonics, radial and new trapezoidal-shaped resonators are placed instead of the quarter-wavelength transmission lines of the conventional GPD. Moreover, these resonators create eight transmission zeros and occupy small circuit sizes. For designing the proposed GPD, appropriate electrical lengths of transmission lines are selected. This GPD has high −15 dB fractional bandwidth, 71%, good isolation, > 15 dB, and compact sizes, 0.07 λ g ×0.22 λ g . The operating frequency of the designed power divider is 2.1 GHz that can be used in many WCDMA applications.

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In this paper, a new dual-band Wilkinson power divider (WPD) is designed and fabricated using novel low and high impedance stubs instead of quarter-wavelength transmission lines. The proposed circuit was analyzed using odd and even mode analysis, and the optimal values of design parameters were obtained using the particle swarm optimization algorithm. The designed power divider has input reflection coefficients (S11) of −22.1 and −17 dB at the first operating frequency of 2.2 GHz and the second operating frequency of 14.2 GHz, respectively. It also improves stop-band and fractional bandwidth (FBW) while maintaining a simple topology. The proposed WPD suppresses undesired harmonics from the second to the fifth with an attenuation level of less than −20 dB in the first band and generates a broad stop-band (4.4–11.5 GHz). In the first band, the FBW is 54.5%, and in the second band, it is 20.1%.

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