Low-Profile Broadband Magnetoelectric (ME) Dipole Antenna with Dual-Complementary Source
Liu Wenbo, Tao Wang, Darong Gao, Liu Yong, Zhang Xingli
Abstract
In this letter, a magnetoelectric (ME) dipole antenna with low profile, broadband, stable unidirectional radiation is presented. Traditional Γ-shaped feeding structure is shunted, improved, and hence a dual-magnetic dipole is formed. Furthermore, a dual-electric dipole is also formed by etching a slot on top electric dipole patch. Therefore, an ME dipole antenna with a dual-complementary source is achieved by combining both of dual-magnetic dipole and dual-electric dipole element and has a very lower profile of 0.079λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the free-space wavelength of center frequency). Additionally, the working principle is analyzed by discussing the surface current of this dual-complementary source ME dipole. The electric dipole and magnetic dipole work alternatively in one period of time domain. By measurement, the relative impedance bandwidth is 46.2% (from 2.45 to 3.92 GHz) for VSWR<; 2. Boresight gain ranges from 6.98 to 10.19 dBi in its impedance bandwidth. A low crossed polarization is also obtained. By comparison with other works, the proposed antenna has an advantage in broadband and height-saved applications.