Abstract
In this paper, a unit cell of a single-negative metamaterial structure loaded with a meander line and defected ground structure (DGS) is investigated as the principle radiating element of an antenna. The unit cell antenna causes even or odd mode resonances similar to the unit cell structure depending on the orientation of the microstrip feed used to excite the unit cell. However, the orientation which gives low-frequency resonance is considered here. The unit cell antenna is then loaded with a meander line which is parallel to the split bearing side and connects the other two sides orthogonal to the split bearing side. This modified structure excites another mode of resonance at high frequency when a meander line defect is loaded on the metallic ground plane. Specific parameters of the meander line structure, the DGS shape, and the unit cell are optimized to place these two resonances at different frequencies with proper frequency intervals to enhance the bandwidth. Finally, the feed is placed in an offset position for better impedance matching without affecting the bandwidth The compact dimension of the antenna is 0.25 λL × 0.23 λL × 0.02 λL, where λL is the free space wavelength with respect to the center frequency of the impedance bandwidth. The proposed antenna is fabricated and measured. Experimental results reveal that the modified design gives monopole like radiation patterns which achieves a fractional operating bandwidth of 26.6%, from 3.26 to 4.26 GHz for |S11|
Highlights
One of the main challenges of modern portable devices of wireless communication is to give more functionality with a compact housing
A compact, broadband split ring resonators (SRR) unit cell antenna loaded with meander line and defected ground structure (DGS) structure is designed, analyzed and tested
The unit cell of the SRR structure is used as the main radiating element of the antenna which gives low frequency resonance
Summary
One of the main challenges of modern portable devices of wireless communication is to give more functionality with a compact housing. A meandered slot structure is used on the ground plane and three Y-shaped slots and one rectangular slot are cut on the Y-shaped patch to generate multiple resonances at low frequency region and the bandwidth is enhanced [4]. In [11], a wide slot is cut on the ground plane and a horizontal stub is protruded from the right edge of the slot toward the center of the defected ground plane to achieve compact and wideband properties Another category of miniaturization techniques includes utilizing different shaped structures or cutting a particular shaped structure. A particular shape is cut and slots are loaded to get compactness These are the techniques which include half wavelength resonators. The prototype is fabricated and measured which shows good agreement with simulation
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