| Closely Spaced Two-Element Folded-Dipole-Driven Quasi-Yagi Array |
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Son Xuat Ta, Sang-Gu Kang, Ikmo Park |
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Department of Electrical and Computer Engineering, Ajou University |
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| Abstract |
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This paper presents a closely spaced two-element folded-dipole-driven quasi-Yagi array with low mutual coupling between adjacent elements. The antenna utilizes a T-junction power divider as the feeding network, with an input impedance of $50{Omega}$. A microstrip-stub is added to the ground plane in the middle of the two elements to improve the mutual coupling characteristics. The folded dipole driver is connected to a $50{Omega}$ microstrip line via a broadband microstrip-to-coplanar stripline transition with a quarter radial stub. A mutual coupling of less than -22 dB is measured between two folded-dipole-driven quasi-Yagi antennas with a center-to-center spacing of 30 mm ($0.55{lambda}_0$ at 5.5 GHz). The proposed quasi-Yagi array yields a measured bandwidth of 4.75~6.43 GHz for the -10 dB reflection coefficient and a gain of 6.14~7.12 dBi within the bandwidth range. |
| Key words:
Quasi-Yagi Antenna, Antenna Array, Folded Dipole Driver, Quarter Radial Stub, Microstrip Stub |
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