Design and development of a compact and low cost folded-hairpin line bandpass filter for L-band communication

The folded hairpin line resonator filters are compact, small and simple to design and built. The full-wave simulator IE3D is being used to design the resonator and to calculate the coupling coefficients. Measured results are to be compared with the computed response. This paper presents a new class of five-pole folded hairpin line microstrip resonator filters wih 60% or more reduction in size compared to the conventional hairpin line resonators. The proposed five-pole folded hairpin line microstrip filter is a narrow band, high selectivity, and low cost band pass filter for trans/receive communication systems in L-band.