A Low-Profile High-Isolation Duplex Antenna with Omnidirectional and Unidirectional Radiation Patterns

Wei Wang

doi:10.54097/ty6szk36

Authors

Wei Wang

DOI:

https://doi.org/10.54097/ty6szk36

Keywords:

Antenna, Duplex Antenna, High Isolation, Omnidirectional Radiation, Unidirectional Radiation

Abstract

In this paper, a low-profile high-isolation duplex antenna operating at 3.6/4.5 GHz is proposed for 5G wireless communication systems. The proposed antenna has a low profile of 0.06λ₀ at 3.6 GHz and a single circular radiator, which is coupled excited by two high-isolation ports simultaneously for duplexing application. When Port 1 is excited, a -10 dB impedance bandwidth with omnidirectional radiation is obtained to cover N78 band. When Port 2 is excited, a -10 dB impedance bandwidth with unidirectional radiation is achieved for covering N79 band. Due to the different feeding schemes and orthogonal radiation patterns, the in-band isolation both for the two operation bands is higher than 35 dB without additional decoupling structure. The proposed antenna is fabricated and measured. The simulated and the measured results are in a good agreement. Results show that the -10 dB impedance bandwidths for the two ports are 3.24–3.95 GHz and 4.33–5.37 GHz, respectively, and the gains for the two operation bands are 2.7–5.15 dBi and 8.8–11.1 dBi, respectively.

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References

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