Time modulation phased array feed network chip and time modulation radio frequency system

Abstract

The invention discloses a time modulation phased array feed network chip, which comprises: a numerical control attenuator module 101 used for realizing time amplitude modulation and eliminating inconsistency of each chip caused by a process; a 0 / 90-degree phase shifter module 103 used for acting together with a Wilkinson power divider WKD2 of a reconfigurable power divider module to form an I / Q orthogonal path so as to realize an orthogonal time modulation phased array system; a 0 / 180-degree phase shifter module 104 controlled by a FPGA control circuit so as to realize time phase modulation; and an amplifier module 105 consisting of a power amplifier and a low-noise amplifier and used for amplifying a transmitted or received radio frequency signal so as to meet the power requirements of the system on a transmitted signal and a received signal, wherein all the modules are integrated in a single gallium nitride-based time modulation phased array feed network chip. The invention also provides a time modulation radio frequency system. According to the invention, the size of the time modulation radio frequency system can be effectively reduced, the phase shift precision is improved, and the system has higher linearity.

Description

technical field [0001] The invention relates to microwave monolithic integrated circuits and microelectronics technology, in particular to a time-modulated phased array feed network chip and a time-modulated radio frequency system. Background technique [0002] In recent years, with the development of wireless communication systems, phased array antenna systems have been widely used in precision guidance, navigation systems, aerospace and other fields. The radiation characteristics of the traditional phased array antenna system are realized by controlling the feed amplitude and phase of the feed network, so the feed network is required to contain precise phase shifters and variable gain amplifiers. In the microwave / millimeter wave frequency band, the design of the phase shifter is complicated, and the phase shifting accuracy is not high. Therefore, the time-modulated radio frequency system has a very broad application prospect. [0003] The time modulation radio frequency ...

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Problems solved by technology

However, the main content of the above patents is reflected in the implementation method of the double time modulation antenna complex weight, which does not fully consider the RF front-end circuit of the phased array system, the nonlinear effect in the actual circuit design, and the matching between various modules. Issues at the design level are as follows:

[0004] (1) The design process of the system did not take into account the impact of nonlinear effects on the performance of the time-modulated radio frequency system under high transmit or receive power in the actual time-modulated radio frequency system; There are problems such as poor matching performance and high insertion loss, which greatly increases the volume of the system and weakens the performance of the time-modulated radio frequency system; (3) does not take into account the inconsistency of each unit in the system due to the processing and packaging process. Mismatch problem; (4) Key issues such as the integration method of the transceiver front-end chip and the switching and isolation of the receiving and transmitting channels are not mentioned or explained in detail

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