Abstract
A planar magnetoinductive (MI) waveguide loaded rectangular microstrip patch antenna is presented and discussed. The MI waveguide consists of two planar metamaterial split squared ring resonators (SSRRs) placed in between two microstrip lines. The backward wave propagation takes place through this structure. The rectangular microstrip patch antenna is magnetically coupled to the MI waveguide. The unloaded rectangular microstrip patch antenna resonates at 37.10 GHz. When loaded with planar MI waveguide, its resonant frequency is reduced to 9.38 GHz with the bandwidth and gain of 44% and 4.16 dBi respectively. In loaded condition, the dimension of antenna is 12.50 mm × 3.70 mm (0.390 λ × 0.115 λ). The appreciable bandwidth is achieved in such a small size antenna. The pass band frequency of MI waveguide is predicted by using the theoretical model of dispersion equation. The effective medium theory is used to verify the metamaterial characteristics of SSRR. The simulated results and theoretical calculations are also presented. The results show that the proposed method can be used to design compact and high bandwidth microstrip patch antennas.
Highlights
In 1967, the Russian physicist Viktor Veselago presented the properties of artificial materials named as metamaterials
The MI waveguide consists of two planar metamaterial split squared ring resonators (SSRRs) placed in between two microstrip lines
This approach does not discuss the internal modes of the structure. These modes are the short-wavelength eigen modes present in the microscopic nature of periodic metamaterial split ring resonator array. These eigen modes are referred as magnetoinductive waves which are the slow waves that only propagate within certain pass band along the periodically coupled array of small magnetic resonators that is SRRs and wires [8,9]
Summary
In 1967, the Russian physicist Viktor Veselago presented the properties of artificial materials named as metamaterials. The basic properties of metamaterials like effective permeability and permittivity are normally analyzed by using effective medium theory [4,5,6,7] This approach does not discuss the internal modes of the structure. These modes are the short-wavelength eigen modes present in the microscopic nature of periodic metamaterial split ring resonator array. These eigen modes are referred as magnetoinductive waves which are the slow waves that only propagate within certain pass band along the periodically coupled array of small magnetic resonators that is SRRs and wires [8,9]. Different components like magnetoinductive waveguide transducer, directional couplers, power dividers, splitters, tapers etc. have been proposed and fabricated [7,8,9,10,11,12,13,14]
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