Abstract
In this paper, a Wilkinson power divider is modified using four-series delta-stub and folded steppedimpedance transmission line (FSITL) in order to achieve a reduced circuit size of 84% and fractional bandwidth of 116%. Series delta-stubs are used instead of open shunt stubs to obtain an optimum shifting frequency and wider bandwidth. Folded stepped-impedance transmission line (FSITL) is used to achieve reduced circuit size. The proposed power divider is fabricated using RT/duroid 5880 substrate with thickness of 0.38 mm. The dimension of the power divider is 13 mm × 6.5 mm. The proposed power divider has typical power division of -3 dB and insertion loss less than -1 dB, better than -13 dB of isolation, less than -10 dB return loss and phase imbalances less than 2° from 1.5 to 3 GHz. Both simulation and measurement results show a good agreement.
Highlights
Conventional Wilkinson power dividers (WPD) [1] are usually used for power division in microwave communication systems since they have a good isolation between the two separated output ports, a low insertion loss, and a simple fabrication process
The proposed Wilkinson power divider is designed to operate for equal power division across the band 1 GHz to 3.5 GHz
The simulated and measured S-parameters results of the modified power divider are presented in Figs. 7 and 8(a), respectively
Summary
Conventional Wilkinson power dividers (WPD) [1] are usually used for power division in microwave communication systems since they have a good isolation between the two separated output ports, a low insertion loss, and a simple fabrication process These power dividers have large circuit size due to the application of long transmission line (λ/4 length) to match the output port to the input port, for lower operating frequencies RF systems. In [18], they incorporated delta-stub in both WPD arms to achieve ultra-wide band (UWB) characteristics; they did not reduce the size high center frequency of 6.85 GHz was used. All these proposed techniques may increase the circuit size and insertion loss [10]. Wideband and compact Wilkinson power divider of center frequency 2.4 GHz was developed
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