Broadband filtering antenna based on grid slotted patches

Abstract

The invention discloses a broadband filtering antenna based on grid slotted patches. The antenna comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are sequentially arranged from bottom to top; a first air layer exists between the first dielectric plate and the second dielectric plate; a second air layer exists between the second dielectric plate and the third dielectric plate; a third copper-clad layer is formed on the upper surface of the third dielectric plate, and a grid slotted patch is arranged on the third copper-clad layer; a second copper-clad layer is formed on the upper surface of the second dielectric plate, and a rectangular patch is arranged on the second copper-clad layer; the upper surface of the first dielectric plate is provided with a grounding plate, the lower surface of the first dielectric plate is provided with a first copper-clad layer, the grounding plate is provided with a coupling aperture, the first copper-clad layer is provided with first, second and third half-wavelength U-shaped resonators and a coupling feeder line, and the upper and lower surfaces of the first dielectric plate are provided with input ports. The four-order filtering antenna is comprehensively designed on the basis of a filter and stably works within the range of 2.27 GHz to 2.57 GHz, S11 is smaller than -10 dB, the gain is kept about7.5 dBi, and the whole antenna is simple and compact in structure, convenient to machine and low in cost.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a broadband filter antenna based on grid slotted patches. Background technique [0002] With the rapid development of wireless communication and the commercialization of 5G communication systems, there are higher requirements for the communication capacity and transmission rate of wireless communication systems. In addition, 5G communication systems have certain requirements for the filtering characteristics of antennas. Patch antennas are widely used in wireless communication systems due to their light weight, small size, easy conformality, easy processing, and low cost. However, microstrip patch antennas are often limited by their narrow operating bandwidth. For the bandwidth expansion of the patch antenna, many scholars have proposed many broadband filter patch antenna technologies through continuous improvement and research on its characteristics. However, some methods wil...

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Problems solved by technology

[0006] In general, in the existing work, there are many studies on the design of broadband antennas and filter antennas, but many designed filter antennas have limited bandwidth or only filter in a certain direction, not all directions.

Some methods form multi-tuning loops by adding gaps and other methods to achieve bandwidth widening and filtering, but the gain and waveform of the antenna will be affected

In order to overcome the problem of narrow bandwidth caused by designing filter antennas using the design method of filter synthesis, the present invention proposes a broadband filter antenna based on grid slotted patch

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