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 x 13 x 1.6 mm(3) 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.