Antenna

Abstract

The invention provides an antenna. The antenna comprises a signal transmitting and receiving unit, a phase shift feed unit, a signal emitter and a signal receiver, the signal emitting and receiving unit comprises two radiating groups which are arranged vertically, the phase shift feed unit comprises a signal emitting port, a signal receiving port and a plurality of connection ports, an emission signal of the signal emitter generates two emission signals through the phase shift feed unit, a phase difference between the two emission signals is 90 degrees, and then the emission signals are transmitted to the two radiating groups and subjected to radiation synthesis to form an emission circularly polarized wave; the two radiating groups are also used for receiving and emitting a receival circularly polarized wave and respectively making corresponding induction to generate an induction signal, the receival circularly polarized wave rotates oppositely to the emission circularly polarized wave, a phase difference between the two induction signals is 90 degrees, and the two induction signals are composited to form a receival signal at the signal receiving port under an action of the phaseshift feed unit. The antenna has the advantages that when the antenna receives and emits same frequencies, real-time receiving and emitting can still be realized, occupied bandwidths of the frequencies can be reduced, and the antenna is enabled to occupy less spectrum resources.

Description

technical field [0001] The invention relates to the technical field of radio ranging, in particular to an antenna. Background technique [0002] In low-power ultra-wideband radio ranging equipment, it is generally required that the antenna can transmit and receive radio signals at the same time. The radio signal received by the receiving antenna includes the self-interference signal emitted by itself and the reflected signal of the distant target. The strength of the self-transmitted signal is often much greater than the reflected signal, which may burn out the receiver's low-noise amplifier and other electronic circuits. Therefore, it is necessary to minimize the receiving antenna from receiving the self-transmitted signal. In addition, in order to improve the detection distance and the signal-to-noise ratio of the echo signal, it is also necessary to reduce the strength of the self-interference signal. Both of the above two requirements need to improve the transceiver is...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide an antenna, aiming to solve the problem of poor isolation when the small antenna used for low-power ultra-wideband radio ranging in the prior art transmits and receives in real time at the same frequency

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