A frequency selective antenna

Abstract

The invention relates to a frequency selectivity antenna. The frequency selectivity antenna comprises a flat box-shaped hollow metal cavity, wherein a radiating slot is formed at the top of the metal cavity and a plurality of metal columns and a coaxial connector are arranged at the bottom of the metal cavity; the radiating slot comprises X-shaped radiating slot formed at the middle position and []-shaped radiating slots formed at two sides; the tops of the metal cavities above and below the []-shaped radiating slots are respectively provided with the slot of the Chinese character san, the tops of the metal cavities at the left side and the right side of the X-shaped radiating slot are respectively provided with the slot of the Chinese character er; the frequency selectivity antenna works at the X wave band and has stable band interior radiation characteristic and band-pass filter characteristic and has extremely low cross polarization performance. The frequency selectivity antenna can restrain radio frequency signal outside the work frequency band, additional device is not needed and additional loss is not generated; compared with the microstrip antenna, the loss is relatively low and the efficiency is high; compared with the opening waveguide antenna, the cross section of the cavity structure is lower and is 0.1 (center center frequency wave length), the opening waveguide is greater than 0.25.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to metal cavity slot antennas. The invention can be used both for receiving and for transmitting radio waves. In military terms, it can be used as a terminal antenna for anti-jamming phased array radar systems. In civilian use, it can be used as an antenna for communication, weather radar, air traffic control radar and other systems. Background technique [0002] With the rapid development of applications and requirements, the use of electromagnetic spectrum has been greatly expanded and fully applied, and it is becoming more and more crowded. On the one hand, there are more and more electronic devices working at various frequencies; on the other hand, some platforms such as ships, aircraft and satellites are limited in space. In the case of such a high-density spectrum, the electromagnetic environment of each electronic device is very harsh. Therefore, electromagnetic compatibi...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of poor anti-out-of-band interference ability of existing antennas, reduce the difficulty of system anti-interference design, and improve cross-polarization suppression performance, the present invention provides a method that can realize the matching transmission of the working frequency band of the system and suppress the transmission of electromagnetic waves in other frequency bands. A frequency-selective antenna that eliminates out-of-band interference is applied to phased array antennas such as two-dimensional large-angle scanning situations, and additional current-limiting slits greatly improve cross-polarization suppression performance

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