NDLI: Double-layer metasurface-based low profile broadband X-band microstrip antenna

Content Provider	IET Digital Library
Author	Guo, Meng Wang, Wei Huang, Ping
Abstract	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 × 0.058 λ 0 (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 32.47 % of the centre frequency. This circularly polarised antenna attains both an impedance matching bandwidth of 32.44 % (i.e. 8.29–11.5 GHz) and an axial-ratio bandwidth of 19.72 % (i.e. 9.6–11.7 GHz).
Starting Page	919
Ending Page	927
Page Count	9
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 9, Jul (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.1098
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-04-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Feeds Antenna Radiation Pattern Bandwidth Broadening Broadband Antenna Circular Polarisation Composite Transmission Line Principle Dielectric Constant Dual Resonant Frequencies Electromagnetic Wave Polarisation Frequency 8.29 GHz to 11.5 GHz Frequency 8.41 GHz to 11.67 GHz Frequency 9.6 GHz to 11.7 GHz Impedance Matching Impedance Matching Bandwidth Interlayer Metasurface Layered Metasurface Linear Polarisation Linearly Polarised Double-layer Metasurface Antenna Low Profile Broadband X-band Microstrip Antenna Metamaterial Antenna Microstrip Antenna Multifrequency Antenna Parallel Capacitor Parallel Inductors Polarisation Conversion Metasurface Polarisation Mode Propagation Constant Radiation Patch SHF Single Antenna Slot-coupled Feeding Transmission Line Theory
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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