Double-frequency microstrip antenna array with high isolation

Abstract

The invention relates to a double-frequency microstrip antenna array with high isolation and belongs to the technical field of antenna design. The double-frequency microstrip antenna array comprises a medium substrate, microstrip antenna units and a C-shaped microstrip resonator, wherein the C-shaped microstrip resonator is arranged between the microstrip antenna units, and is a half-wavelength resonator. The double-frequency microstrip antenna array also comprises an inverted C-shaped defected ground structure which is etched on the grounding surface of the back surface of the medium substrate; and the inverted C-shaped defected ground structure can generate the stopband frequency which is adjusted by changing the length of an inverted C-shaped groove. The double-frequency microstrip antenna array provided by the invention has the advantages that the mutual coupling between array elements can be reduced on the two working frequencies of the antenna array simultaneously, the isolation of an antenna port can be improved; and displayed by a preferred embodiment, the isolation between the array elements is increased respectively by 10dB and 17dB on the two working frequencies.

Description

technical field [0001] The invention belongs to the technical field of antenna design and relates to a dual-frequency microstrip antenna array with high isolation. Background technique [0002] In order to adapt to higher data rates and provide greater capacity, multi-port antennas are widely used in the new generation of wireless communication systems. However, in a small-sized wireless device equipped with multiple antennas, it is difficult to ensure high isolation between antenna elements, especially for dual-band antennas. In this case, surface waves and near fields cause coupling between elements. The closer the distance between the array elements, the stronger the mutual coupling effect, which may lead to serious deterioration of the antenna radiation performance. [0003] In recent years, various approaches to achieve high isolation in compact arrays have been proposed. For example, a decoupling network based on reactive elements or hybrid couplers can increase the...

AI Technical Summary

Problems solved by technology

However, most high-isolation antenna arrays are single-frequency antennas, which are difficult to apply to today's dual-frequency or multi-frequency communications

The improvement of dual-frequency antenna array isolation can be achieved by designing a more complex dual-frequency decoupling network composed of inductors and capacitors connected in series and parallel, or by reconfigurable antennas using single-frequency decoupling technology and switches. But this method requires a switch control circuit, and the two frequency bands cannot work at the same time

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