Radio frequency phase shifter

Abstract

The invention provides a radio frequency phase shifter. The radio frequency phase shifter includes multiple first transmission lines, multiple second transmission lines, multiple mixers and multiple couplers, wherein the multiple first transmission lines are sequentially connected to form a mother transmission line, the multiple second transmission lines are sequentially connected to form anothermother transmission line, the multiple first transmission lines and the multiple second transmission lines are in one-to-one correspondence, a coupler is connected between the two adjacent first transmission lines, a coupler is connected between the two adjacent second transmission lines, one mixer is connected between two corresponding couplers, when two input signals with different frequencies are transmitted on the two mother transmission lines, the multiple mixers arranged in sequence output a set of output signals having phase gradients. The radio frequency phase shifter is advantaged inthat the two different frequency input signals are aliased on a periodic node (mixer), a set of signals with the same frequency but with the phase gradients are generated, and the phase gradients canbe changed through changing the input frequency, and thereby the phase scanning function is realized.

Description

technical field [0001] The invention relates to the field of phased array antennas, in particular to a radio frequency phase shifter. Background technique [0002] The next generation of mobile communication 5G will bring a communication rate of tens or even hundreds of Gbps, far exceeding the current and previous communication systems. To achieve this goal, 5G not only utilizes broadband spectrum resources in multiple frequency bands, such as the millimeter-wave frequency band, but also uses large-scale antenna arrays to further increase channel capacity by utilizing the spatial diversity of electromagnetic wave transmission. [0003] In a phased array antenna, the phase of each antenna unit needs to be controlled in order to realize the beam property, which is usually realized by means of an analog phase shifter. The analog phase shifter generally directly changes the phase of the RF signal on the RF link. In a large-scale array, each antenna needs a set of phase shifters...

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Problems solved by technology

[0003] In a phased array antenna, the phase of each antenna unit needs to be controlled in order to realize the beam property, which is usually realized by means of an analog phase shifter. The analog phase shifter generally directly changes the phase of the RF signal on the RF link. In a large-scale array, each antenna needs a set of phase shifters to control the corresponding phase, resulting in a complex structure of the entire antenna system, high cost and difficult to control

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