A NOVEL POWER DIVIDER INTEGRATED WITH ONE BANDPASS FILTER

A novel compact wideband inphase multilayer power divider based on slotline-to-microstrip coupling structure is presented in this paper. To improve the isolation between output ports, this power divider breaks the conventional half-wavelength slotline conflguration and introduces a lumped resistor. A wideband bandpass fllter integrated with the power divider is designed to allow the power divider to reject the undesired signals located in adjacent frequency channels. This fllter consists of two E- shape units. In order to improve its performance at low frequency band, a lumped capacitor is bridged between the two E-shape units. As an example, a wideband power divider combining with a bandpass fllter is designed and fabricated. The experimental results show that the proposed power divider has a low insertion loss, high isolation, good return losses at all ports, good amplitude and phase balance, as well as ∞at group delay over the wide frequency band from 3.5GHz to 10GHz. In addition, the width of upper stopband reaches up to 3.8GHz (12.9GHz{16.7GHz) corresponding to attenuation more than 20dB.