Miniaturized broadband circularly-polarized three-dimensional printing mixed dielectric resonator antenna

Abstract

The invention relates to a miniaturized broadband circularly-polarized three-dimensional printing mixed dielectric resonator antenna, which comprises a feed substrate, a grounding plate with a cross gap in the center and a dielectric resonator which are sequentially stacked from bottom to top, wherein the lower surface of the feed substrate is provided with a microstrip transmission line for feeding, a patch array is embedded in the dielectric resonator, a rectangular groove is formed in the upper part of the dielectric resonator, and the patch array is located below the bottom part of the rectangular groove and is parallel to the feed substrate. According to the miniaturized broadband circularly-polarized three-dimensional printing mixed dielectric resonator antenna, through a mode of digging the groove in the upper part of a dielectric block, on the basis of not increasing the overall size of the antenna, fusion of three radiation modes is realized, and the circular polarization bandwidth of the antenna is greatly broadened; besides, the rectangular dielectric block with low dielectric constants is adopted, and the patch is arranged in the middle of the dielectric block based on the three-dimensional printing technology, so that the overall size of the antenna is only 0.39 lambda<0>*0.39 lambda<0>*0.19 lambda<0>, a directional diagram is symmetrical, the radiation performance is good, and the antenna can be applied to a beam forming array.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a miniaturized broadband circularly polarized three-dimensional printed mixed-media resonator antenna oriented to beamforming applications. Background technique [0002] Multiple-input multiple-output beamforming technology is the most critical technology of the fifth generation mobile communication system. In order to achieve a good beamforming effect and avoid the appearance of grating lobes, the spacing between antenna elements should be 0.5λ 0 around, so the plane size of the antenna element should be much smaller than 0.5λ 0 ×0.5λ 0 . At the same time, the core requirement of the fifth-generation wireless communication system is high speed, and broadband technology is the key factor to realize high data rate wireless communication. In addition, the circularly polarized antenna can receive incoming waves with any polarization, and its radiated waves can also be rece...

AI Technical Summary

Problems solved by technology

Some broadband technologies have been proposed, for example: ①Multi-resonance method: Introducing some special structures such as slots, ladders, and rotating stacked structures to make the resonator exhibit multi-resonance characteristics, but it will make the antenna structure large and complex and affect the antenna. Radiation pattern; ②Hybrid radiation method: Combine the radiation mode of the dielectric resonator and the radiation mode of the feed structure to increase the bandwidth, but there will be a problem of large back lobe and the same problem as the ① scheme; ③Traveling wave feed Electric method: A current with approximately traveling wave distribution is generated on the square spiral feeder. Since there is almost no reflected wave, the impedance matching is improved and the bandwidth is widened. However, the bandwidth increase of this scheme is limited, and the axial ratio bandwidth of more than 20% has not been achieved. , and at the same time, due to the larger gap etched in the floor, the rear lobe of the antenna is larger

Although the above methods can increase the bandwidth, they cannot meet the requirements of miniaturization and broadband directional circular polarization at the same time.

[0004] The existing broadband design technology for single-point fed circularly polarized dielectric resonator antennas can effectively broaden the antenna bandwidth, but it is often difficult to take into account the miniaturization performance of the antenna. For example, in technologies ① and ②, the two radiation modes can be combined The axial ratio bandwidth of the scheme is all below 25%, and the scheme that can provide three or more radiation modes can meet the requirements of large bandwidth, but the antenna plane size cannot be less than 0.5λ 0 ×0.5λ 0 Formation requirements

However, the bandwidth increase effect of technology ③ is not as good as ① and ②, and the achieved axial ratio bandwidth is less than 20%, and the feeding structure used is more complicated

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