Abstract
In this paper, the design of a modified ring power divider dedicated for wideband communication or measurement systems is presented. The proposed power divider is built by using a conventional ring power divider and an additional Stepped-Impedance Resonator (SIR). The even-odd mode analysis is used to derive the design equations. In order to observe the bandwidth improvement, a comparative study between the designed device and the previously reported ring power divider is conducted. The electromagnetic (EM) simulated results show that the proposed divider has a fractional bandwidth of 90.2 % at the center frequency of 3.17 GHz and shows a bandwidth enhancement up to 27.2 % compared to the conventional ring structure. The measurement results of the fabricated prototype demonstrate high performance over the considered operational bandwidth from 1.7 GHz to 4.64 GHz with a return loss lower than -10 dB while maintaining a good insertion loss and a good isolation between the output ports. The maximum amplitude imbalance is better than 0.21 dB and the phase imbalance is better than 2.5 degrees between the output signals. The simulation and measurement results are in good agreement over the whole band of interest.
Highlights
Power dividers are extremely useful microwave components whose principal function is to split the incident signal between the two outputs while maintaining good isolation between them
This circuit is offering very good performance over a wide bandwidth compared to the traditional Wilkinson power divider
The simulation results show that the fractional bandwidth has a significant increase of 27.2 % compared to the old structure as it will be seen in section II and this without affecting the circuit size since the added element is inside the ring structure
Summary
Power dividers are extremely useful microwave components whose principal function is to split the incident signal between the two outputs while maintaining good isolation between them. Broadband power divider achieving good in-band responses across a 62 % fractional bandwidth was proposed in [9] by arranging two open-circuited stubs and three coupled-line sections around the ring resonator. This circuit is offering very good performance over a wide bandwidth compared to the traditional Wilkinson power divider. This design had shown more stability and larger bandwidth than previous implementations among valid solutions This circuit has a size reduction of around 20 % compared to classical Wilkinson power divider and improved performances in terms of RF input/output matching and isolation between the output RF ports [11]. The simulation results show that the fractional bandwidth has a significant increase of 27.2 % compared to the old structure as it will be seen in section II and this without affecting the circuit size since the added element is inside the ring structure
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