Filtering patch antenna without additional arrangement of filter circuit, and adjustment method thereof

Abstract

The invention discloses a filtering patch antenna without additional arrangement of filter circuit, and an adjustment method thereof. The antenna comprises a bottom metal reflection floor, an intermediate feed patch and a top parasitic patch. The two sides of the feed patch are each provided with a short circuit probe, the feed patch is provided with a U-shaped groove, a short circuit probe is arranged in front of an opening of the U-shaped groove, and a feed point is arranged behind a closing position of the U-shaped groove. The top parasitic patch is fixed right above the feed patch at an interval of a certain height. According to the invention, the filtering patch antenna itself has a filtering function and realizes a bandpass filtering characteristic without additional arrangement of the filter circuit. The passband edge is deep, the sideband suppression is obvious, the frequency selectivity is good, adjacent frequency interference can be inhibited, the bandpass filtering characteristic and an antenna radiation function are integrated together, the plat grain at a passband position is quite high, and the filtering patch antenna is applied to such mobile communication scenes as WCDMA, 4G-LTE, WLAN and the like.

Description

technical field [0001] The invention relates to an antenna in the field of wireless mobile communication, in particular to a filter patch antenna without an external filter circuit and an adjustment method thereof. Background technique [0002] In the field of wireless communication, in order to make full use of the spectrum resources allocated by the system, the spectrum interval between channels is generally set very small. On the other hand, the nonlinear effect of active devices in the communication system will generate a lot of clutter. When the clutter falls within the passband range of the receiver, it will cause adjacent frequency interference. This places stringent requirements on the frequency selectivity of RF front-ends in wireless communication systems. In practical applications, the communication system will perform power control, and a bandpass filter module will be added to the RF front end to filter out clutter outside the passband and suppress adjacent fre...

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Problems solved by technology

The utility model with the publication number CN201812933U, "Integrated Filter Antenna", adopts the first scheme of adding an external circuit, which will bring additional filtering loss, and the overall realization volume is relatively large; the research team of Southeast University adopts the second scheme Based on the dielectric substrate integrated waveguide solution, a series of filter antennas have been made, but they all work in the X-band (10GHz), Ku-band (14.4GHz), and Ka-band (38GHz) above 10GHz, and there is no suitable work below 3GHz. Filter antenna covering 4G-LTE communication frequency band (such as 2.3-2.7GHz) and wireless local area network WLAN communication frequency band (2.4GHz); invention patent of South China University of Technology, publication number CN102570020A, "A kind of squareness with good and stopband bandwidth controllable "Ultra Wideband Notch Antenna", the third scheme is adopted to realize the filter antenna with band-rejection characteristics in the UWB frequency band (3.1-10.6GHz); while the fourth scheme is adopted, the frequency selective surface is easy to cause antenna radiation Performance deterioration, and the electrical size of the cavity is several times the wavelength, resulting in a larger antenna size

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