Dual-Mode Transmissive Metasurface and Its Applications in Multibeam Transmitarray

This article analyzes the radiation principle of a slot‐coupled hemispherical dielectric resonator antenna (DRA) integrated with a single‐layer metamaterial (MTM) superstrate, investigating it both numerically and experimentally. It creates a compact high directive DRA incorporating MTM superstrate. The proposed MTM medium consists of broadside coupled planar E‐shaped resonator periodic unit cell exhibiting low loss and a low refractive index over a broad frequency band. Measurements on fabricated prototypes to verify numerical results from full‐wave simulations, and they show more than 6 dB increase in directivity of the DRA.

Section: Introductionmentioning

confidence: 99%

DRA gain enhancement using a planar metamaterial superstrate

Panda

Sahu

Mishra

2018

“…One of the most recent and effective methods to improve the antenna performance is by incorporating metasurfaces in antennas . These metasurfaces include electromagnetic band‐gap (EBG), high impedance surface (HIS), artificial magnetic conductor (AMC), and reactive impedance substrate .…”

Section: Introductionmentioning

confidence: 99%

Beam-reconfigurable crescent array antenna with AMC plane

Lago

Soh

Jamlos

et al. 2018

A beam‐reconfigurable crescent array antenna with AMC plane is presented for application at 9.41 GHz. The unit cell of the AMC plane is modeled based on a square patch integrated with rectangular ring slot with mirrored C‐shaped structures, placed between two layers of Taconic TLY‐5 substrate and located near to the main radiating element. The presented AMC design is achieved an operating bandwidth of 2.82 GHz (30%) with a center frequency of 9.41 GHz. It is found that the AMC plane can reduce the thickness of the structure in comparison to the use of a conventional ground plane, which leads to the overall compactness size of the proposed antenna of 1.1λ × 2.57λ. Moreover, through the implementation of 12 × 4 AMC unit cell, the proposed antenna improved its performance with a maximum gain and total efficiency of 10.5 dB and 97%, respectively. Meanwhile, the antenna reconfigurability is realized by integrating RF MEMS switches on its right and left arm symmetrically. The presence of a T‐shaped Yagi‐Uda‐like parasitic further widened the beam steering angle to ±63° via mutual coupling. The obtained results demonstrate a good agreement between the simulation and measurement and have a huge potential for development of X‐band radar.

“…With the invention of split ring resonator (SRR) in 1999, a number of researchers across the world are using its property of negative permeability. Metamaterial inspired designs are widely used in microwave engineering since their practical realization at the beginning of the twenty‐first century . In the last decades, various antennas have been reported with compact size and multiple band operations using different methods such as loading of the slot, metamaterial, active devices, and stacking .…”

Section: Introductionmentioning

confidence: 99%

A hexa-band dual-sense circularly polarized antenna for WLAN/Wi-MAX/SDARS and C-band applications

Alam

Mainuddin

Kanaujia

et al. 2018

In this article, a compact single fed hexa‐band circularly polarized (CP) monopole antenna using split ring resonators (SRRs) on the partial ground plane is designed and experimentally investigated. The loaded SRR elements generate multiple circularly polarized bands along with a reduction in antenna size. The multiband can be controlled by changing the configuration of SRRs and their position on the ground plane without altering the monopole radiator. To illustrate the CP mechanism and multiband operation of the proposed configuration, the surface current density has been studied. The antenna is fabricated on RT Duroid 5880 substrate of permittivity 2.2 with a total size of 47 × 40 × 1.57 mm3. Compared with the existing antenna designs, the proposed structure is compact and demonstrates improved multiband performance with circular polarization.