Wide-angle scanning phased-array antenna based on bent slot

Abstract

The invention discloses a wide-angle scanning phased-array antenna based on a bent slot. The antenna comprises a feed structure and a radiation structure, the radiation structure comprises a first substrate layer and a second substrate layer, the first substrate layer is provided with a plurality of dielectric resonant cavities, the second substrate layer is provided with at least two radiation units, each radiation unit comprises a plurality of bent slots with the same bending direction, the bending directions of the bent slots of the adjacent radiation units are opposite, the two corresponding bent slots of the adjacent radiation units are located in the same space defined by the metalized via holes, and in each bent slot, electric field horizontal components at two sides are mutually counteracted; and the feed structure comprises a third substrate layer and a fourth substrate layer, the third substrate layer is provided with a plurality of I-shaped slots, the fourth substrate layer is provided with a microstrip line, and the microstrip line feeds through an SMPM connector. According to the invention, the beam width in the scanning direction of the array element can be broadened so that the scanning range of the phased array is expanded.

Description

technical field [0001] The invention relates to the antenna field of electronic communication technology, in particular to a wide-angle scanning phased array antenna based on a waveguide slot antenna. Background technique [0002] In recent years, millimeter wave technology has increasingly shown great application value in military, civil and industrial fields, especially for the emerging fifth / sixth generation mobile communication (5G / 6G) and vehicle millimeter wave radar technology, which has become a wireless An important direction of technological development. Antennas are essential components in wireless systems, and scanning phased array antennas (referred to as phased arrays) are an important type of antenna. Phased arrays can change the direction of high-gain beams or form specific beam shapes according to needs, which are of great value to millimeter wave communication (including 5G / 6G), radar, imaging and detection systems. According to the dimension of beam scan...

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Problems solved by technology

[0004] J.Xu et al. in "Bandwidth Enhancement for a 60GHz Substrate Integrated Waveguide Fed Cavity Array Antenna on LTCC, in IEEE Transactions on Antennas and Propagation, vol.59, no.3, pp.826-832, March 2011, doi:10.1109 / TAP. 2010.2103018", proposed a parallel-fed multi-layer SIW slot antenna based on LTCC technology. This antenna is designed based on the parallel-feed feeding scheme, and has good beam stability and wide bandwidth; but at the same time, the antenna's The number of layers is too high, the number of units is too large, and only an array of fixed beams is made

[0005] At present, there are three main methods to improve the scanning capability of phased arrays: 1. Increase the unit beam width: by improving the beam width of the antenna unit to achieve a wider beam coverage; 2. Reduce the unit spacing: by reducing the column unit 3. Reduce unit mutual coupling: The mutual coupling between units will greatly affect the pattern of the array, and the direction is maintained by reducing the unit mutual coupling The stability of the graph thus obtains a high scanning angle; the above method of improving the scanning ability of the scanning phased array is mainly used in the microwave frequency band, but it is difficult to apply in the millimeter wave frequency band, because: (1) the wavelength of the millimeter wave is short, and some structures require processing High precision, which cannot be guaranteed by the current packaging process; (2) The packaging process is basically a planar circuit process, with limited processing freedom

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