Ultra-wideband strong-coupling array antenna

Abstract

The invention discloses an ultra-wideband strong-coupling array antenna. The array antenna comprises a plurality of antenna units arranged in an array. Each antenna unit includes a dipole antenna array element, a tapered Balun converter, and a resistive frequency selection surface, wherein the dipole antenna array element is a bowtie-shaped short dipole antenna, the resistive frequency selection surface is arranged below the dipole antenna and shaped as a square ring, the tapered Balun converter is arranged below the dipole antenna array element and passes through the resistive frequency selection surface, and the output end of the tapered Balun converter is connected with the port of the dipole antenna. A metal ground plate is arranged below the antenna units. The array antenna can break through the restriction of the grating lobe condition, the unit size and the metal ground plate on the array performance, can work normally in a larger broadband scope, and can meet the functional requirements of different platforms and different tasks.

Description

Technical field [0001] The invention relates to the technical field of microwave wireless communication, in particular to an ultra-wideband strongly coupled array antenna. Background technique [0002] With the rapid development of wireless communication technology, higher and higher requirements are put forward for various antennas. On the one hand, the rise of indoor high-speed wireless data access technology has put forward a wide range of needs for ultra-wideband antennas. On the other hand, due to the working frequency range of the ultra-wideband communication system, there are also such things as wireless local area network and global microwave interconnection. In communication systems, in order to reduce the mutual interference between different communication systems, broadband phased array antennas have been increasingly used. [0003] Modern phased array antennas use an electronic system to control the feed amplitude and phase of each unit in the antenna array so that the...

AI Technical Summary

Problems solved by technology

[0006] (2) Theoretically, a frequency-invariant antenna with a self-similar structure has infinite bandwidth, but limited by the unit size and feed structure, the impedance broadband that can be realized is also limited, especially in the array environment, the lateral size of the antenna unit is limited by limit, which also limits the minimum operating frequency of the unit antenna;

[0007] (3) In order to achieve directional radiation and increase the gain of the array antenna, it is necessary to install a ground plate at the bottom of the antenna array. When the distance between the antenna unit and the ground plate is 1 / 4 wavelength of the operating frequency, the excitation current and the mirror current are superimposed in phase. However, when the distance from the ground plane is half a wavelength, the excitation current and the mirror current cancel out in phase, and effective radiation cannot be achieved. Therefore, the ground plane becomes another important factor that limits the working bandwidth of the array antenna.

[0008] To sum up, the antenna bandwidth of the traditional array is very limited, generally no more than 6 octaves, and the existing phased array antennas have not solved this problem

Images