Low profile compact vertical polarization antenna with reconfigurable directional pattern

Abstract

The invention relates to a low profile compact vertical polarization antenna with a reconfigurable directional pattern, and belongs to the field of antenna design. The antenna comprises an upper dielectric substrate, a lower dielectric substrate, three identical top loaded folded monopoles, a feed structure, a coaxial cable and a metal floor. According to the invention, top loaded patches are rationally designed into the shape of a fan, so that the patches can be integrated on the same dielectric substrate to reduce the antenna size; then a curved groove is etched on each fan-shaped patch to further reduce the size of a monopole unit; and finally, three PIN switching diodes are skillfully utilized, so that the monopoles are alternately used as excitation oscillators and parasitic oscillators, and the directional pattern of the antenna can be reconstructed. The alternate working mode greatly reduces the antenna size. According to the invention, the designed vertical polarization antennahas three reconfigurable directional pattern modes, can realize 360-degree scanning in the horizontal direction, and has the advantages of low profile and compact structure.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a low-profile compact vertically polarized antenna with a reconfigurable pattern. Background technique [0002] On the one hand, the pattern reconfigurable vertically polarized antenna has great advantages in improving signal-to-noise ratio, reducing multipath effects, and saving energy; on the other hand, compared with horizontal The polarization method is not easy to generate polarization current, thus avoiding a large attenuation of energy and ensuring the effective transmission of signals. Therefore, vertically polarized antennas with reconfigurable pattern have received extensive attention in recent years. However, in many previous studies, most reconfigurable vertically polarized antennas use a monopole antenna unit placed in the middle of the antenna as the excitation oscillator, and several parasitic monopole units are surrounded around the antenna. By using such as a PIN...

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Problems solved by technology

However, in many previous studies, most reconfigurable vertically polarized antennas use a monopole antenna unit placed in the middle of the antenna as the excitation oscillator, and several parasitic monopole units are surrounded around the antenna. By using such as a PIN tube, the variable Capacitance tube and other active devices are controlled, and some parasitic monopoles and excitation oscillators are selected to form a Yagi antenna to form an end-fire beam to realize the reconfigurable antenna pattern. When the antenna works in a certain end-fire state, there is always The parasitic monopole is in an idle state, which undoubtedly leads to low utilization of the antenna space, resulting in a large antenna size, which is not conducive to the installation and use of the antenna

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