Wideband Bandpass Power Divider Using Slot-coupled Diamond-shape Microstrip Lines

A new type of wideband bandpass power divider using slot-coupled diamond-shape microstrip lines is introduced and investigated in this paper. A coupling topology structure evolved from Marchand balun is used to form the in-phase bandpass power divider. By using slot-coupled diamond-shape structure, tight-coupling value is easier to realized. The defected mircostrip structure(DMS) is used to obtain a wide over 15dB stopband from 5.08 to 14.15 GHz ( 4f0). A prototype centered at 3.46 GHz with 75% fractional bandwidth (10-dB return loss) is designed, fabricated and tested. The measured insertion loss is less than 0.6 dB. The simulated and measured results have well agreement.