Planar low-profile micro-strip filtering antenna based on band-pass filter prototype

Abstract

The invention provides a planar low-profile micro-strip filtering antenna based on a band-pass filter prototype, belongs to the technical field of communication. The planar low-profile micro-strip filtering antenna comprises a dielectric substrate and a floor. The invention provides a filtering antenna technology based on the band-pass filter prototype, which can be used for realizing radiation filtering response with a high out-of-band rejection level under the condition that an additional filtering circuit and a complex parasitic structure are not used. Meanwhile, the physical form of the provided filtering antenna is a microstrip coupling line feed double-patch radiator, and the filtering antenna is very simple in structure and easy to process. A coplanar waveguide-slot line-microstrip line conversion structure is used as a Balun and a power divider, aims to excite a differential coupling line, and improves the frequency selectivity and the out-of-band rejection level by introducing a hybrid electromagnetic coupling feed technology. The micro-strip filtering antenna has a low profile and a compact structure, and is beneficial to miniaturization and integration design of a radio frequency front end.

Description

technical field [0001] The invention belongs to the technical field of filter antennas, in particular to a flat low-profile microstrip filter antenna based on a band-pass filter prototype. Background technique [0002] Antenna and filter are two important components of the RF front-end. Among them, the antenna is responsible for receiving / transmitting electromagnetic signals, and the filter is responsible for filtering interference signals. Their performance plays a decisive role in the overall working quality of the wireless communication system. In order to comply with the development trend of miniaturization and integration of wireless communication systems, filter antenna technology has been proposed and received extensive attention in recent years. Filtering antenna technology can integrate the filtering function of traditional filters and the radiation function of antennas in the same device, which can effectively reduce the size of the RF front-end, reduce loss and im...

AI Technical Summary

Problems solved by technology

However, the introduction of various complex parasitic structures makes the design process of the filter antenna very complicated; the parasitic structure will also introduce parasitic modes, resulting in a low level of out-of-band suppression; Reduce the difficulty of processing, assembly and debugging

[0005] To sum up, the existing filter antenna technical solutions (1) and (2) are limited by the existence of the filter circuit, and the improvement of the designed filter antenna in terms of miniaturization and integration is very limited; the solution (3) is due to the FSS The existence of the radome has the problems of large overall volume, low antenna radiation efficiency, and high processing cost; scheme (4) has problems such as complicated filter antenna design process, low level of out-of-band suppression, and complex antenna structure.

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