Novel Ultra-Compact Wide Stopband Microstrip Lowpass-Bandpass Triplexer for 5G Multi-Service Wireless Networks

Abstract

This work presents a very compact microstrip lowpass-bandpass (LP-BP) triplexer, which is designed and analyzed based on a novel structure. Due to its complex design process, this type of triplexer is rarely designed. Compared to the previous LP-BP triplexers it has the most compact size of 0.006 λg 2 , whereas an LP-BP triplexer with dimensions smaller than 0.01 λg 2 has not been designed yet. This triplexer is designed based on a perfect mathematical method and optimization simultaneously. Its lowpass band has a cut-off frequency of 0.67 GHz, suitable for low-band 5G applications. The resonance frequencies of its bandpass channels are located at 2.15 GHz and 3.19 GHz. These bandpass channels make the proposed triplexer appropriate for 5G mid-band applications. This triplexer can suppress the harmonics from the first up to 8th harmonic. The bandpass channels are flat and wide with two fractional bandwidths (FBW) of 15% and 11.97%. To prove the designing process and its simulation results, the presented novel LP-BP triplexer is fabricated and experimentally measured. The comparison results show that the experimental measurement confirms the simulation results. The close alignment between the measurements and simulation results demonstrates a high level of accuracy of our designing method.

A Lowpass-Bandpass Triplexer With A New Microstrip Configuration and Compact Size for 5G and Energy Harvesting Applications

“…In contrast, BP devices only need a mid-band resonator. Consequently, microstrip LP-BP triplexers [6][7][8][9][10] are not frequently reported in the literature. All of the reported microstrip LP-BP triplexers in [6][7][8][9][10] have large sizes.…”

“…Consequently, microstrip LP-BP triplexers [6][7][8][9][10] are not frequently reported in the literature. All of the reported microstrip LP-BP triplexers in [6][7][8][9][10] have large sizes. The proposed triplexer in [6] is suitable for GSM and 5G applications, which has low group delays (GDs) at all its bands.…”

“…But it has high losses at the 2 nd and 3 rd channels. The designers in [10] could reduce the size in comparison to the other microstrip LP-BP triplexers. However, it seems that by using new configurations, the size can be reduced again.…”