Phased array front end based on non-linear active antenna

Abstract

The invention provides a phased array front end based on a nonlinear active antenna. A frequency source generates a transmission baseband signal which is distributed to a transmitting-receiving arrayby a power division network; the transmission baseband signal is filtered by a band-pass filter in the transmitting-receiving array; then the filtered transmission baseband signal is subjected to mixing with a local oscillator signal generated by an injection phase-locking array; the mixed signal is filtered by the band-pass filter to generate a transmission signal, and the transmission signal isamplified by a power amplifier after being selected by a transmitting-receiving switch; and finally the amplified signal is transmitted to an antenna through a circulator and radiated to the space. According to the invention, the phase of the local oscillator signal is controlled to realize beam pointing control. On one hand, the transmission loss of the array plane is reduced, and the efficiencyof the array plane is improved; and on the other hand, a microwave integrated chip or a micro microwave integrated chip is adopted to realize the chip design of the injection phase-locking array, theintegration level of the array plane is improved, the cost of the system is reduced, and the characteristics of high integration level and low cost are achieved.

Description

technical field [0001] The invention relates to the field of antennas, in particular to a nonlinear active antenna, which is mainly used in the engineering realization of large-scale and low-cost active phased array front ends. Background technique [0002] The many advantages of phased array radar meet the increasingly stringent requirements of various mission systems in military and national economic development. The antenna of the active phased array radar is a phased array antenna realized by T / R components. Its implementation principle is the same as that of the passive phased array antenna. The phase shifter is used to control the phase distribution of the antenna array to realize the antenna array beam. Scanning and beamforming. [0003] Modern radar systems highlight the requirements of high reliability, low cost, low loss, small size, and light weight for T / R components. In the process of integrating T / R components into the array plane, the phase shifter and its co...

AI Technical Summary

Problems solved by technology

At the same time, the antennas of spaceborne, airborne, and vehicle radar systems put forward higher requirements for phased arrays, but if phased array antennas are to be widely used in these systems, it is necessary to further reduce costs, reduce volume, and improve efficiency. The main factor limiting passive and active phased array antennas in these respects is the phase shifter

[0004] The traditional passive phased array antenna takes the phase shifting network and power distribution network as the core, and controls the shape and beam direction of the beam by controlling the geometry of the antenna array and the amplitude and phase distribution of the antenna aperture excitation signal, so the passive phased array The antenna has the following disadvantages: the equipment is huge, which is not conducive to miniaturization and integration; the power loss of the power distribution network and the phase shifting network is very alarming; due to the requirements of real-time performance and the complexity of the beamforming algorithm, the beam control computer must use a high-performance computer, and the equipment is expensive ; When the operating frequency increases, the application of phased array antennas is limited due to the lack of efficient phase shifters

[0007] The research at this stage mainly focuses on the theoretical level, and the developed principle prototype is only of low maturity, which is mainly used for the principle verification of the coupled oscillator array, while the research on the actual engineering realization of the nonlinear active antenna array is rarely found. With the current development of digital technology and actual engineering needs, in order to realize the active array with the ability of transmitting beam scanning and receiving multiple beams at the same time, and has the characteristics of high integration and low cost, it is urgent to combine nonlinear active phased array antennas. With the current mature digital array technology, carry out related work research on large-scale, low-cost nonlinear active antenna arrays for phased array RF front-end applications

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