In this paper, we present an ultra-miniaturized microstrip bandpass filter (BPF) operating at 14GHz. One miniaturized hairpin resonator is used which is coupled in both input and output ports giving the BPF response. The gap of the hairpin configuration is represented by a capacitance. This proposed bandpass resonator filter is designed in ultra-miniaturized with good S-parameter responses. The overall dimension of the designed BPF is 1.245mm by 0.812mm. It is fabricated on Teflon substrates with relative permittivity,  with thickness of 0.54mm.

bandstop filter, ultra-miniaturized BPF, Ku-band BPF.