Active phased array antenna with internal calibration network

Abstract

The invention provides an active phased array antenna with an internal calibration network, and aims to provide the active phased array antenna which has advantages of small number of hardware devices, high calibration precision, and small influence by an external environment. The active phased array antenna is realized through a technical solution which is characterized in that the amplitude-phase information of each antenna array element channel is extracted through coupling with the internal calibration network which is closed in a multilayer belt-shaped printed circuit board in an integrated hot compacting manner, and is transmitted to a signal terminal processing module for performing standard algorithm processing; calibration network units in two channels of a phased array are respectively connected with two feed transmission lines for forming a directional coupling belt-shaped linear coupler. The belt-shaped linear coupler acquires the energy of each channel of the antenna from the feed transmission line at an array surface RF front-end through coupling, and performs power combination through a plurality of T-type junctions with tuning branches for obtaining a total transmitting-receiving calibration signal. After calibration algorithm processing is performed on the transmitting-receiving calibration signal through a signal processing module, the transmitting-receiving calibration signal is returned to each channel of the antenna for performing amplitude phase compensation, thereby monitoring and calibrating the signal of each channel of the active phased array antenna.

Description

technical field [0001] The invention relates to an active phased array antenna with an internal calibration network to realize the monitoring and calibration function of the amplitude and phase of each channel of the active phased array antenna. technical background [0002] The phased array antenna is composed of several antenna units or antenna sub-arrays, and each unit or sub-array channel is connected with microwave devices such as phase shifters, attenuators, amplifiers, filters, and mixers. There are bound to be certain errors in the manufacturing and installation of these microwave devices, and aging, thermal deformation, and replacement of components may also occur during long-term operation. Therefore, it is difficult for phased array antennas to ensure that each channel of the phased array The consistency between the amplitude and phase, and in some cases, it is very likely that individual channels will fail, which will cause the beam pointing accuracy of the phase...

AI Technical Summary

Problems solved by technology

The "internal calibration" technology is mature, the performance is relatively stable, and it is suitable for the use in the actual working environment, but the "internal calibration" method currently used generally requires a large amount of hardware equipment

[0004] To sum up, in the phased array antenna calibration, the "external calibration" is greatly affected by the external environment, the calibration accuracy is low, and the "internal calibration" has a large amount of equipment and complex hardware structure

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