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http://dx.doi.org/10.6109/jkiice.2022.26.7.1032

The Design of Cavity Filter to enhance the Group Delay characteristics for 5G Mobile Communication Repeater  

Yoo, Soo-Hyung (Course of Information and Communications, Tech University of Korea)
Jin, Duck-Ho (IMS Co. Ltd.)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.26, no.7, 2022 , pp. 1032-1039 More about this Journal
Abstract
In this paper, we designed and implemented a cavity bandpass filter combined with a cross-coupling equalizer structure to enhance Group delay for 5G mobile network repeater, which can replace the SAW (Surface Acoustic Wave) type bandwidth filter used in the existing mobile communication system. Using the 3D EM simulation tool (HFSS), the resonance frequency, the coupling coefficient between resonators, and external quality coefficient between resonators were calculated. Based on this, a 12th bandpass filter was constructed to have attenuation characteristics of more than 20dB at the edge end of both sides of the band with a metal cavity structure with a frequency band of 3500MHz to 3600MHz and bandwidth of 97.85MHz. The designed bandpass filter satisfies the group delay time requirement for the 5G mobile communication standard and the in-band and out-band frequency responses.
Keywords
5G Mobile Network; Cavity filter; SAW filter; cross-coupling; Group delay;
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