Design and analysis of hybrid reflection-mode bandstop filter for unwanted frequency rejection in 5G communication system

Ahmed Bamatraf, Emad Abdulaziz (2021) Design and analysis of hybrid reflection-mode bandstop filter for unwanted frequency rejection in 5G communication system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

5G is the fifth technology generation for telecommunications and mobile networks known to have been in operation since 2019. Fast speeds of the network, superior reliability and minimal latency are the key aim for 5G implementation. Yet 5G technology continues to be developed for everyday use. One of the best examples of microwave communication improvement is the bandpass filter. A large number of applications, including using Defected Ground Structure (DGS) in the band-pass filter, have been discovered. A bandpass filter is therefore suggested. The 5G communication network, running in the 26–28 GHz band, is equipped for this filter. The parameters for defected ground structure (DGS) will be used to evaluate the SIW band pass filter performance. Return loss should be greater than -10 dB and insertion loss less than -3 dB which are the suggested criteria for this filter. Another example of the microwave communication improvement is the bandstop filter, which is used in this project. This project is linked to the development and analysis of hybrid reflection-mode bandstop filter for unwanted frequency rejection in 5g communication system. Ka-band satellite frequency operates in range from 24.9 to 26.5 GHz. However, for satellite communication, the uplink frequency range is usually around 27 to 31 GHz. Hence the interference between satellite frequency and 5G signal will occur within that frequency range. Furthermore, the Band-stop filter is used to attenuate the defined undesired frequency. This filter was made using substrate integrated waveguide (SIW) technology. The substrate type used is Rogers Duroid 5880 with dielectric of 2.2 and the thickness is 0.254mm. The design involves simulation based on Computer Simulation Technology (CST) Studio Suite software. The performance of the band-stop filter will be analyzed at 27 to 31 GHz frequency range in terms of the insertion-loss (S12) and return-loss (S11). The aim is to get (S12) close to or more than -15dB. However, the overall analysis will be carried out on the efficiency of the filter’s attenuation and bandwidth.

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