A Planar Low Profile Microstrip Filter Antenna Based on a Bandpass Filter Prototype

Abstract

The invention provides a flat low-profile microstrip filter antenna based on a band-pass filter prototype, which belongs to the field of communication technology, including a dielectric substrate and a floor. The invention provides a filter antenna technology based on a band-pass filter prototype, which can be used without A radiation filter response with a high level of out-of-band rejection is achieved using an additional filter circuit and complex parasitic structures. At the same time, the physical form of the proposed filter antenna is a microstrip coupled line-fed double patch radiator, and its structure is very simple and easy to process. The coplanar waveguide-slot line-microstrip line transition structure is used as both a balun and a power divider to excite differentially coupled lines to improve frequency selectivity and out-of-band rejection by introducing hybrid electromagnetic coupling feeding techniques . The microstrip filter antenna has a low profile and a compact structure, which is beneficial to the miniaturization and integration design of the 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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