Compact long‐term evolution antenna for automotive mobile communications

Abstract

This letter presents a compact long‐term evolution antenna, which is capable of covering 698 to 960 MHz and 1710 to 2690 MHz bands simultaneously for automotive mobile communications. Taking performance and aesthetic appeal into account, the antenna is placed in a shark fin plastic shell, which is mounted on the roof of the vehicle. The proposed antenna is mainly composed of a feeding monopole, a grounded strip, a parasitic strip, and a parasitic patch. The lower band is covered by the quarter‐wavelength resonant modes of the feeding monopole and grounded strip. The higher band is originally generated by the high order modes of the feeding monopole and grounded strip, and further widened by the quarter wavelength resonant modes of two parasitic structures. The utilization of some miniaturization techniques, such as parasitic radiating elements, loading substrate, and meandering radiating elements, enables the proposed antenna to achieve a compact structure. Therefore, the proposed antenna only occupies a compact volume of 29 mm × 15 mm × 57 mm. It is worth noting that the proposed antenna achieves two widebands without additional matching network. Besides, the proposed antenna has omnidirectional radiation patterns in the azimuthal plane for the working bands.