Standalone-Quad-Channels Diplexer for Modern Wireless Applications Based on Overlapped MOERRs

Abstract

This paper presents a highly independent quad-channels 2^nd order diplexer for 5G and Wi-Fi applications. The proposed diplexer was developed by utilizing four overlapped modified open-ended rectangular resonators (MOERRs). The OERRs of both applications were loaded in parallel to a microstrip feed line in order to reduce the diplexer size and enhance the isolation level. The minimum measured insertion loss for the operating channels were 1.962 dB, 2.941 dB, 1.925 dB, and 2.397 dB with center frequencies of 3.586 GHz, 4.143 GHz, 5.193 GHz, and 6.135 GHz, respectively. Moreover, the measured return loss were better than 20 dB and the isolation at the operating bands were better than 23.13 dB. The measured results validated the simulated findings with small variations that mainly attributed to fabrication and material uncertainty.