A novel compact Chebyshev filtering power divider for WCDMA applications
摘要
In this article, a Wilkinson power divider (PD) with very small dimensions and suppression of disturbing harmonics is designed, simulated, and fabricated based on the Chebyshev filter. New resonators have been used in the design of the presented PD, which have never been used in any other structure before. The transfer function of the LC equivalent circuit of these resonators corresponds to a sixth-order Chebyshev filter that has a ripple of 1 dB in its passband. Also, the Grey Wolf optimization algorithm has been used to calculate the values of inductors and capacitors. Using this Chebyshev filter, the final design of Wilkinson achieves the overall dimensions of the proposed circuit of about 11.1 × 13.2 mm. Additionally, even and odd mode analysis has been used to analyze the performance of each part of the circuit. Finally, the proposed PD is fabricated on Rogers RT/duroid 5880 substrates. The measurement results of this PD show that at the center frequency of 1.4 GHz, its S12 is only − 3.1 dB, and unwanted second to sixteenth harmonics are suppressed with an attenuation level of less than − 20 dB. The results of software simulation and experimental measurement match each other very well. Furthermore, the fractional bandwidth (FBW) of this circuit is about 96.42%, which shows that this compact circuit has very wide capabilities. Thus, it can be used in many wideband code division multiple access (WCDMA) applications.