A pattern reconfigurable antenna applied for automobile 5G communication

Abstract

In this article, a radiation pattern reconfigurable antenna (RPR antenna) based on the complementary source principle is proposed for automobile communication. This antenna achieves four end-fire radiation patterns in four directions by controlling the operating states of PIN-diodes. The structure of this center-fed antenna includes a corners-shorted patch and four parasitic monopoles with eight PIN-diodes to control the states of monopole antennas. The monopole antenna works as an electric current source while the center-fed patch antenna can be equivalent to in-phase magnetic currents at its periphery due to the existence of the loaded monopole. Then the radiation mechanism of the RPR antenna can be explained as a pair of orthogonal magnetic and electric current sources. As a result, four end-fire radiation patterns can be obtained by changing OFF/ON states of PIN-diodes and this antenna can be applied for high-resolution omnidirectional coverage by switching among four modes. To verify the simulation, an example antenna is fabricated and measured. The measured result exhibits a À10-dB impedance band of 3.21-3.73 GHz with a maximum realized gain of 7.07 dBi.Results show that this antenna is suitable for automobile 5G communication.

Research on the electromagnetic characteristics of metasurfaces based on air dielectric substrates

“…This feature is highly valuable for applications such as wireless communication, radio wave imaging, and radar. [19][20][21][22][23] Characteristic mode analysis (CMA) is widely applied in the design of metasurface antennas. [24][25][26][27][28] It can effectively assist designers in analyzing the current distribution of metasurface metal units, the frequency range of modal significance (MS), and providing a theory for the design of wideband and reconfigurable antennas.…”