Multilayered substrate‐integrated magnetoelectric dipole antenna with low profile and wideband

Abstract

In this article, a multilayered substrate-integrated magnetoelectric dipole antenna with low profile and wideband is proposed. Based on the multilayered printed circuit board technology, the magnetoelectric dipole antenna is composed of four layers of substrate. By adopting rectangular window techniques, the impedance matching at the low-frequency band is improved and a low profile of 0.08λ0 (where λ0 is the free space wavelength of the center frequency) in height is achieved. A Γ-shaped meandering unit is also adopted to guide the electric current through the rectangular window and enhance the boresight radiation. Additionally, the antenna is fed by a 1/4 wavelength microstrip line on bottom plane to easily integrate to the front-side planar circuit. The transverse size of the proposed antenna is 100 mm*50 mm (0.8λ0*0.4λ0). Through simulation and optimization, the wideband, low profile, and unidirectional radiation characteristics are obtained simultaneously. The tested impedance bandwidth ranges from 1.92 to 3.15 GHz (48.5%) for voltage standing wave ratio (VSWR) < 2. The radiation property is also validated and the boresight mean gain is 5.1 dBi. Cross polarization level at boresight is lower than −25.15 dB. Both simulated and tested results agree well with each other.