Ultra-Thin UHF Broadband Antenna on a Non-Uniform Aperiodic (NUA) MetaSurface

Chamok, Nowrin H.; Ali, Mohd. Hasan; Anthony, Theodore K.; Weiss, Steven J.

doi:10.1109/map.2015.2414491

Cited by 18 publications

(7 citation statements)

References 39 publications

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“…The outer conductor of the SMA was soldered to the ground plane. Vector Network Analyzer (VNA) was then calibrated using open, short, and 50 Ω load over a broad frequency range of interest . S ‐parameter ( S 11 ) data were measured for each antenna sample by connecting to (VNA).…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of heterogeneity in additively manufactured dielectric structures on RF response of microstrip patch antennas

Keerthi

Hamad

Mian

et al. 2017

Int J RF Microw Comput Aided Eng

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Microstrip patch antennas with a tunable radiofrequency (RF) response are a great candidate for additive manufacturing (AM) process. First, three separate sets of ABS samples were created at three different machine preset fill densities using an extrusion based 3D printer. Once fabricated, actual solid volume fraction of each set of samples was measured using a 3D X‐ray computed tomography microscope. It is observed that the factory preset fill‐density values are only applied to the core region and actual solid volume fractions for each sample set are different from printer‐preset values. Also, the printed materials appeared to exhibit anisotropy such that the thickness direction dielectric properties are different from the in‐plane properties (planar isotropy). Microstrip patch antennas created on the AM fabricated ABS were tested for resonant frequencies using a vector network analyzer (VNA). The measured resonant frequencies combined with ANSYS‐HFSS simulation were used to estimate bulk dielectric constant of ABS and equivalent dielectric properties in planar and thickness directions. It is observed that the antenna resonant frequency decreases with an increase in core solid volume fraction. Also, in‐plane permittivity appeared to have minimal effect on antenna resonant frequency, while the thickness direction properties have substantial effects.

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Section: Experimental Methodsmentioning

confidence: 99%

Effect of heterogeneity in additively manufactured dielectric structures on RF response of microstrip patch antennas

Keerthi

Hamad

Mian

et al. 2017

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, its unique left-handed material was derived from the mutual coupling between the upper patches, resulting series capacitance, and parallel inductance created by vias. Because of this, the mushroom-shaped antenna can simultaneously exhibit broadband, low profile, miniaturisation, and directional radiation patterns in the right-hand region [14][15][16]. However, due to the lack of compactness of the periodic metal pillar array, it possessed disadvantages in industrial production and application.…”

Section: Introductionmentioning

confidence: 99%

Double‐layer metasurface‐based low profile broadband X‐band microstrip antenna

Guo

Wang

Huang

2020

IET Microwaves, Antennas & Propagation

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In this paper, a novel technology based on double‐layer metasurfaces is proposed in order to broaden the bandwidth of microstrip antennas, which has been verified in X‐band linearly polarised and circularly polarised antennas. Referring to the conventional metasurface antenna that employs slot‐coupled feeding, these designs add an extra metasurface between the radiation patch and the ground plane so as to establish dual resonance modes, TM10 and TM20. Following the adoption of the composite right/left‐handed transmission lines principle, this technique aims to adjust the propagation constant in the right‐hand region by introducing parallel inductors and capacitors to widen the dual resonant frequencies' interval, thereby realising a broadband antenna. In addition, the interlayer metasurface may also be utilised as a director to balance the E‐field of the radiation patch. A linearly polarised double‐layer metasurface antenna with a size of 0.8×0.8×0.058λ0 (wavelength in free space at the centre frequency) is filled with F4B substrate with a dielectric constant of 2.2. It finally realises an impedance matching bandwidth (VSWR≤2) from 8.41 to 11.67 GHz, occupying about 32.47normal% of the centre frequency. This circularly polarised antenna attains both an impedance matching bandwidth of 32.44normal% (i.e. 8.29–11.5 GHz) and an axial‐ratio bandwidth of 19.72normal% (i.e. 9.6–11.7 GHz).

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“…As far as the authors can see, it is the first time that the non‐uniform RIS topology is used to improve the CP performance of a planar antenna. Up to now non‐uniform MSs have been investigated only to improve the LP antenna bandwidth [38, 39] and aperture efficiency [40].…”

Section: Introductionmentioning

confidence: 99%