Miniaturisation of microstrip patch antenna using an artificial planar magneto‐dielectric meta‐substrate

Abstract

In this communication, a practically realisable artificial planar magneto‐dielectric (MD) meta‐substrate is proposed and investigated for microstrip patch antenna miniaturisation. The meta‐substrate employs cross‐coupled twisted metallic split‐ring resonator ring pairs to achieve effective permeability (μeff) and permittivity (ɛeff) greater than that of the host dielectric which leads to antenna miniaturisation. Electromagnetic simulation and analysis of effective material parameters are performed to characterise it, which shows nearly equal enhanced effective permeability and permittivity (μeff ≃ ɛeff) at 2.35 GHz with low loss‐factor level not achievable from natural materials. An inset fed microstrip patch antenna is designed on the proposed MD meta‐substrate to test and validate its performance. The performances of the miniaturised patch antenna loaded with proposed dispersive MD meta‐substrate, non‐dispersive homogenous MD substrate, and high‐permittivity substrates (lossy and loss‐free) are compared with the conventional patch antenna on host dielectric. It is found that dispersive nature of the meta‐substrate plays a critical role in the antenna performance. The antenna on proposed meta‐substrate occupying an overall volume of 0.250λ0 × 0.344λ0 × 0.009λ0 at 2.35 GHz is 74.83% miniaturised as compared with the conventional antenna on host dielectric. To ensure the practicability, the designed antenna is fabricated and measured.

Magneto‐dielectric substrate‐based microstrip antenna for RFID applications

“…7. Table 2 shows the resonance frequency, miniaturisation ratio, gain, frequency bandwidth and radiation efficiency of the proposed antenna compared with other reported antennas [6,12,13], indicating that the proposed antenna has the best performances in terms of the radiation gain, radiation efficiency and miniaturisation ratio among these antennas. Table 2 also shows that the radiation efficiency, gain and bandwidth are the best for the antennas in [14,15] among the other presented works.…”

Application of metamaterials for performance enhancement of planar antennas: A review

“…In DGS, the radiated signal coming out of the slotted structure may couple to the neighboring device and create unwanted noise, which in turn creates electromagnetic compatibility problem. In the design of reduced size antennas and overwhelming the limitations of conventional miniaturization methods, metamaterials have been played incredible roles as being patch loads, ground plane loads, substrate inclusions, or superstrates …”

“…A CPW fed dual‐band antenna with U‐ and inverted U‐shaped metamaterial loaded substrate has been presented by Reference and achieved 35% and 77% miniaturization than the conventional patch antenna at the first and second resonance bands, respectively. The miniaturization effect of the magnetodielectric substrate with the inclusion of SRR pairs in a twisted fashion of an inset fed patch antenna was analyzed and compared with high‐permittivity and nondispersive substrates in Reference . About 74.83% reduction in size has been realized for the antenna resonating at 2.35 GHz using the artificial material inclusion (patch size of 16 mm × 22 mm) as compared to the conventional Rogers RO4003 substrate material (patch size of 33.3 mm × 42 mm).…”

Compact Microwave Components with Harmonic Suppression Based on Artificial Transmission Lines

“…The rapid development of the modern communication system makes a high requirement for size miniaturization of microwave components [1][2][3]. At present, size miniaturization methods of microwave components include loading lumped elements [4], using right/left-handed transmission lines [5], employing a defected ground structure (DGS) [6], utilizing a microstrip electromagnetic bandgap (EBG) [7], and applying slow-wave transmission lines with inductive and capacitive loading [8].…”