Development of Filtering Power Divider for WLAN Application Using SIW Bandpass Filter

The growth of technological device used in wireless local area network (WLAN) such as antennas, power dividers, and filters should be able to deliver the device to be low-cost, light weight, and compact. This paper deals with the development of power divider for WLAN application which is incorporated with filter, called as filtering power divider (FPD). The conventional power divider is enhanced by adding bandpass filter (BPF) made of substrate integrated waveguide (SIW) structure. A simulation software is used to design and optimize the filter performance. The FPD which is fabricated using an RT/Duroid® 5880 dielectric substrate with the dimension of $\mathbf{65} \mathbf{mm}\times\ \mathbf{95\ mm}$ has good performance in the frequency range of 5.92 GHz to 5.98 GHz with the insertion loss of −6.5 dB. The isolation between output port is −20dB at the center frequency of 5.95 GHz which produces very low crosstalk level. In addition, the proposed FPD has the ability to be integrated with other circuits especially for reconfigurable feeding antenna usage.