A new structure of microstrip Yagi antenna is proposed in this article in order to obtain a high gain and wide bandwidth. It is called Octagon Microstrip Yagi Antenna. The Octagon Microstrip Yagi Antenna has been simulated, optimized, constructed, and tested. According to simulated results, it appears that the simulated Octagon Microstrip Yagi Antenna has the ability to obtain 15.97% bandwidth and gain of 11.16 dB in a compact size of 70 mm × 75 mm. On the other hand, experimental results show that the fabricated Octagon Microstrip Yagi Antenna can achieve a gain of 11 dB with 13.8% bandwidth. It can be seen that there is a good agreement between simulation and measurement results. Hence, it gives evidence that the proposed antenna is capable of producing a high gain with a wide bandwidth in a smaller size as compared to the others.
A high gain octagon fractal microstrip Yagi antenna (OFMYA) at 5.8 GHz industrial, scientific and medical band is presented in this letter. The OFMYA utilizes Cross Snow fractal concept as its director elements. A double‐negative (DNG) and double‐positive (DPS) layers are placed above the OFMYA in order to attain more gain. A prototype of the OFMYA has been etched on Arlon CuClad 217 which has dielectric permittivity of 2.2 and thickness of 0.787 mm. Meanwhile, DNG and DPS are made of Arlon AD1000 having dielectric permittivity of 10.2 and thickness of 0.787. The proposed antenna was simulated and measured. Experimental result shows that the OFMYA with a combined DNG and DPS layer yields a gain of 15.9 dB. It indicates that the proposed antenna in this article is capable to provide a higher gain with a smaller surface size compared to other microstrip Yagi antennas.
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