Metamaterial cavity for the isolation enhancement of closely positioned dual-polarized relay antenna arrays

Abstract

A novel metamaterial cavity for the isolation enhancement of closely positioned dual‐polarized relay antenna arrays is proposed in this paper. The metamaterial cavity is composed of four sets of double‐layer complementary meta‐surface and metal reflector. Numerical and experimental results show that the isolation level of the same polarization ports for the proposed metamaterial cavity‐backed antennas can be improved by at most 10dB over the frequency band of 2.5–2.7 GHz, as well as the isolation of the cross polarization ports. More importantly, the metamaterial cavity‐backed antennas keep other good performance such as VSWR < 1.5 and a stable radiation pattern where the metamaterial cavity is loaded. The metamaterial cavity is suitable not only for the common antenna arrays, but also for the separate antenna arrays. The proposed design is easy to integrate with pico‐base station antennas, relay antennas and repeater antennas. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:857–862, 2017

A low‐profile dual‐polarized multilayer parasitic patch array antenna with narrow air gap

“…In response to these requirements, one solution is the utilization of polarization diversity, in which dual orthogonal linear polarization is common. Impetus from this technique, the involved dual‐polarized antenna has become trending topic in recent years . In addition, antennas with a low profile are popular choices for flat type wireless devices/terminals.…”

“…To improve impedance, gain, and isolation performance of a dual‐polarized microstrip antenna, various techniques were employed, such as loading metamaterials . As reported in many literatures CSRRs frequently work with an inner and an outer split‐ring resonator (SRR) arranged on the same plane behaving mainly as a magnetic resonator .…”

“…As reported in many literatures CSRRs frequently work with an inner and an outer split‐ring resonator (SRR) arranged on the same plane behaving mainly as a magnetic resonator . When the 2 SRRs are, respectively stacked on both side of a substrate (termed stacked CSRRs that consists of the lower and upper SRR, with a left‐handed feature resulted) and applied on linear/dual‐polarized antennas in an array arranged form, the mutual coupling between the radiation elements or gain can be effectively improved . Moreover, it is noteworthy to mention that a low profile with enhanced gain can be enabled by loading a magnetic‐dielectric superstrate composed of stacked CSRRs .…”

“…Impetus from this technique, the involved dualpolarized antenna has become trending topic in recent years. 3,4 In addition, antennas with a low profile are popular choices for flat type wireless devices/terminals. Especially, in some military applications, there is an urgent need for a device with low profile, but this is not a stringent requirement for its planar size.…”

“…14 To improve impedance, gain, and isolation performance of a dual-polarized microstrip antenna, various techniques were employed, such as loading metamaterials. 3 As reported in many literatures CSRRs frequently work with an inner and an outer split-ring resonator (SRR) arranged on the same plane behaving mainly as a magnetic resonator. 15 When the 2 SRRs are, respectively stacked on both side of a substrate (termed stacked CSRRs that consists of the lower and upper SRR, with a left-handed feature resulted 16 ) and applied on linear/dualpolarized antennas in an array arranged form, the mutual coupling between the radiation elements or gain can be effectively improved.…”