Abstract
In this paper, meta-surface superstrates are used to decouple two linear polarized antennas coupled in H-plane and E-plane, respectively. By properly designing the geometry of the double layer short wires as the unit cell of the meta-surface, as well as the height of the meta-superstrate, two linearly polarized antennas can be decoupled in H-plane and E-plane, respectively. Both the antenna pairs coupled in E- and H-planes with and without meta-surfaces are fabricated and measured. The results demonstrate that the antennas with the meta-surface superstrate are able to operate in the band of 3.3–3.7 GHz with reflection better than −15 dB and the isolation can be improved from 10 to 25 dB in the H-plane case and can be improved from 15 to 30 dB in the E-plane case. Such decoupling method can be applied extensively in 5G base stations where size constraints are becoming stringent.
Highlights
Nowadays, the fifth generation of mobile communication technology (5G) has become the main stream technology for mobile communication systems, which requires higher transmission rate on a wider operation bandwidth
The proposed meta-surface is composed of double layer short wires
By loading the meta-surface above two antennas coupled in H and E plane respectively, the isolation in both cases can reach to 25 dB under the premise of good matching at two ports for |S11| < −15 dB in the band of operation (3.3 GHz −3.7 GHz)
Summary
The fifth generation of mobile communication technology (5G) has become the main stream technology for mobile communication systems, which requires higher transmission rate on a wider operation bandwidth. The antenna technology for 5G base stations is evolving very fast, and they have to meet the requirements of antenna miniaturization, wide frequency band, high isolation, etc. While satisfying the antenna matching, the antenna decoupling is an important concern when designing the base station antenna in a compact volume. Literature on the decoupling design of antennas in recent years and these papers can be divided into the following categories: 1) Neutralization line and decoupling network [1]–[11]: These decoupling networks or neutralization lines are designed between antennas to reduce their mutual couplings.
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