  Microstrip three-way (that is, 4.8 dB) integrated filtering power divider
(FPD) is presented in this paper. The proposed FPD evenly distributes an input
power signal into three equal output signals. The design incorporates balanced
signal power division, and filtering technology for the removal of unwanted
frequency elements and aimed at enhancing signal quality and efficiency in the
radiofrequency (RF) front-end of communication systems. Microstrip folded-arms
square open-loop resonator (FASOLR) is employed in the design implementation to
achieve compact size. The proposed FPD features a 2.6 GHz centre frequency,
with a 0.03 fractional bandwidth. The implementation is carried out on Rogers
RT/Duroid 6010LM substrate with a dielectric constant of 10.7, a thickness of
1.27 mm and a loss tangent of 0.0023. The good agreement between the
theoretical and practical results verifies the effectiveness of the FPD in
delivering equal power outputs at the three output ports, and at the same time
filtering out unwanted frequencies. The practical results of the prototype FPD
indicate a good return loss of better than 15.5 dB and an insertion loss of
better than 4.77+0.34 dB. The design prototype achieved compact size of 0.31
{\lambda}g x 0.18 {\lambda}g. {\lambda}g is the guided wavelength for the
microstrip line impedance at the centre frequency of the 3-way equal filtering
power divider.
