Wilkinson power divider design utilizing trapezoidal and rectangular resonators to suppress harmonics

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ABSTRACT A Wilkinson power divider is designed, fabricated, and measured utilizing two suppressor cells and a common elliptical resonator. The suppressor cell consists of high-impedance meandered lines, rectangular-shaped and trapezoidal-shaped elliptical resonators, which create a low-pass filter with a wide stopband. To improve sharpness and decrease the transition frequency band from the passband to the stopband, a trapezoidal-shaped elliptical resonator is used between two suppressor cells. This resonator generates a transmission zero close to the operating frequency, resulting in the suppression of the second harmonic. The proposed power divider structure suppresses all spurious harmonics up to the 24th order. Additionally, two lines with 50 Ω characteristic impedances are included in the output ports of the structure for isolation resistance. The odd/even mode analysis is presented to check the vital parameters. The fabricated power divider is measured, revealing an operating frequency of 0.72 GHz with a bandwidth of 0.27 GHz. The insertion and return losses at the operating frequency are 0.42–0.62 and 16.3, respectively. The output impedance matches are suitable, and the isolation between the two output terminals is 15.04 dB. The dimensions of the power divider measured 0.0034 λg 2, which represents a miniaturized size in communication circuits.