Ultra-Wideband Dual-Polarized Antenna With Three Resonant Modes for 2G/3G/4G/5G Communication Systems

Yaohui Zhang,Kunning Liu,Yonghong Zhang,Daotong Li,Yong Fan

doi:10.1109/access.2019.2906389

Yaohui Zhang, Kunning Liu + Show 3 more

Open Access

https://doi.org/10.1109/access.2019.2906389

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Abstract

In this paper, a compact dual-polarized ultra-wideband dipole antenna is realized by exciting three resonant modes using double-loop (DL) dipoles with stepped exponential-shaped (ES) arms. First, a single-loop (SL) crossed dipole antenna using the modified direct feeding (MDF) structure with ES arms is designed and analyzed to achieve wide bandwidth (1.7–2.7 GHz) with two resonant modes. Second, without increasing the volume of the antenna, one more loop is employed to gain one more resonant mode to enhance the bandwidth into 1.68–3.7 GHz and fractional bandwidth (FBW) up to 75% for VSWR < 1.5. In order to adjust three resonant modes independently, the ES arms of the DL dipole antenna are designed in stepped shapes. The HPBW is 65–70° for 1.7–2.7 GHz (2G/3G/4G) and 95° for 3.4–3.6 GHz (5G). In addition, the proposed antenna can also be designed with a bandwidth of 2.38–6.42 GHz (FBW of 92%) for VSWR < 2, occupying WLAN/4G/5G. As demonstrations, the proposed antennas covering 1.68–3.7 GHz for VSWR < 1.5 (Antenna A) and 2.38–6.42 GHz for VSWR < 2 (Antenna B) are designed, fabricated and measured, and the measured results agree well with the simulations.

Highlights

Dual-polarized antennas are widely utilized in wireless communication systems to alleviate the multipath fading and improve the channel capacity [1]
The patch antenna [4] and Vivaldi antenna [5] can realize ultra-wideband performance, the gain and half-power bandwidth (HPBW) are unstable over the operating band
Magnetoelectric dipole antenna [6] can achieve a bandwidth of 1.7-3.6 GHz for VSWR < 2 and stable radiation characteristics, but is relatively large in size and complicated in fabrication

Summary

Introduction

Dual-polarized antennas are widely utilized in wireless communication systems to alleviate the multipath fading and improve the channel capacity [1]. The HPBW increases to over 110◦ and the gain decreases to 5.5 dBi. In this paper, a dual-polarized ultra-wideband crossed dipole antenna using DL dipoles with stepped ES arms is presented.

Results

Conclusion