Design and Implementation of Highly Selective and Compact Low Profile Bandpass Filter for 5G Mid-Band Frequency Applications

In this paper, a low profile and highly selective microstrip band pass filter is proposed and designed for 5G mid band frequency applications which supports commercial 5G networks. In this filter design, a set of square loop ring resonators are in conjunction with the T shaped feed lines in the outer resonator. The overall filter size is miniaturized, covering about of 13 × 13 × 1.6 mm3 with the usage of FR4 substrate in design process. The designed filter is simulated by method of moment based electromagnetic simulator IE3D. The filter projected an insertion loss of about −0.1 dB and return loss of–27 dB with a bandwidth of about 400 MHz which is liable to be a wide band spectrum for frequency range of 3.4–3.8 GHz with a centre frequency of 3.6 GHz indicating a quality factor of 9. The designed filter is fabricated and tested using Network analyser. The measured results validated good response with the simulated filter design.