Balanced UWB power divider with one narrow notch-band

Abstract

A compact and simple differential ultra wideband (UWB) equal power divider (PD) with one narrow notch-band is presented. The proposed PD is based on slotline resonators and balanced stepped-impedance microstrip-to-slotline transition structures. A wide differential-mode (DM) impedance bandwidth covering from 1.8 to 11.5 GHz can be achieved. Besides, independent common-mode (CM) responses with a larger bandwidth and higher suppression can be obtained. It is noted that the DM passbands are independent from the CM responses, which significantly simplify the design procedure. In addition, a narrow and sharp DM notched band from 5.8 to 5.9 GHz is generated by adding one pair of quarter-wavelength short-circuited stubs next to the microstrip line symmetrically. In order to illustrate the effectiveness of the design, a prototype is fabricated and measured. A good agreement between the simulated and measured results is observed. To the best of authors’ knowledge, the proposed balanced UWB PD is the first ever reported.