A wideband quasi-Yagi antenna using symmetrical slots on the ground plane

ABSTRACT

A wideband quasi-Yagi antenna with symmetrical rectangular slots in the ground plane is studied. The feeding structure of the antenna is simplified, consisting of a microstrip transmission line and a short strip. The driver and director arms are designed as half on both sides of the substrate to improve pattern stability. The antenna’s bandwidth is improved by symmetrically adding rectangular slots to the ground. The antenna works between $3$ and $7.7$ GHz with a gain that varies between $4.7$ to $7.4$ dBi, a bandwidth of $87.8\mathrm{\%}$, and an efficiency of more than $90\mathrm{\%}$. The antenna has a very compact size of $0.42{\lambda }_L\times 0.42{\lambda }_L$ (${\lambda }_L$ is the wavelength for the lowest operating frequency). The simulation and measurement results are in good agreement. The antenna has highly stable end-fire radiation within its operating frequency and can be used for wideband wireless communication systems.

KEYWORDS:

• Planar antennas
• quasi-Yagi
• symmetrical rectangular slots
• wideband antennas

Acknowledgments

This work has been supported by Eskisehir Osmangazi University Scientific Research Projects Coordination unit under grant number 202015017. We also would like to thank Middle East Technical University Antenna laboratory members for radiation pattern measurements.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.