High-selectivity planar filtering Yagi antenna

Abstract

The invention discloses a high-selectivity planar filtering Yagi antenna. The high-selectivity planar filtering Yagi antenna comprises a first copper-clad layer, a dielectric plate and a second copper-clad layer which are sequentially stacked from top to bottom, wherein the first copper-clad layer is provided with an input port, an input feeder, a stub-loaded half-wavelength resonator and a half-wavelength resonator, so a feed network is formed; and the second copper-clad layer is provided with a common floor, a feed balun, a half-wave dipole and a parasitic microstrip line, the common floor is used as a reflector of the planar filtering Yagi antenna, the parasitic microstrip line is provided with a plurality of directors serving as planar filtering Yagi antennas, the half-wave dipole is arranged between the public floor and the parasitic microstrip line, is connected with the public floor through the feed balun and serves as a radiator of the planar filtering Yagi antenna, energy of the feed network can be coupled to the half-wave dipole through the feed balun, and electromagnetic waves are radiated through the half-wave dipole. The high-selectivity planar filtering Yagi antenna has the advantages that high-selectivity gain filtering effect is achieved, a structure is simple, a profile is low, an integration degree is high, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of communication antennas, in particular to a high-selectivity planar filtering Yagi antenna. Background technique [0002] Planar Yagi antennas are widely used in wireless communication systems because of their high directivity, low profile, and easy processing. In previous designs, scholars focused their research on expanding the bandwidth of the antenna in order to improve the shortcoming of the narrow bandwidth of the Yagi antenna. However, although the bandwidth of the antenna has been expanded, its in-band gain is not flat and stable, and its selectivity is poor. In order to meet the flatness and high selectivity of the in-band gain, scholars have successively proposed a Yagi antenna with a filtering effect, that is, a filter Yagi antenna. In these designs, the filter is loaded on the front end of the radiating unit of the Yagi antenna and connected in a cascade method. Although this method can obtai...

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Problems solved by technology

However, due to the direct connection between the filter and the radiation unit, it will cause a large loss, which will affect the radiation efficiency of the antenna, and its working bandwidth is narrow, so it is difficult to adjust flexibly

[0006] In general, in the existing work, there are many studies on Yagi antennas with filtering effects, but many structures are based on direct loading of filters

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