A Differential Low Noise Amplifier Based on Dielectric Integrated Waveguide

Abstract

The embodiment of the invention provides a substrate integrated waveguide (SIW) based differential low-noise amplifier. The SIW based differential low-noise amplifier comprises a first power divider, an amplifying device and a second power divider, wherein the first power divider comprises a first SIW, a first input port, a second output port and a third output port; the second output port is positioned in an upper metal plate of the first SIW, and the third output port is positioned in a lower metal plate of the first SIW; the second power divider comprises a second SIW, a fourth input port, a fifth input port and a sixth output port; the fourth input port is positioned in the upper metal plate of the second SIW, and the fifth input port is positioned in the lower metal plate of the second SIW; the second output port, the third output port, the fourth input port and the fifth input port are all connected in series with the amplifying device. Compared with a differential low-noise amplifier in the prior art, the SIW based differential low-noise amplifier provided by the embodiment of the invention has the advantage of greatly reducing the capacity.

Description

technical field [0001] The invention relates to the technical field of amplifiers, in particular to a differential low-noise amplifier based on a dielectric integrated waveguide. Background technique [0002] Low Noise Amplifier (LNA) is widely used in microwave communication, GPS receiver, remote sensing remote control, radar, electronic countermeasures, radio astronomy, land surveying, TV and various high-precision microwave measurement systems. Less important circuits. [0003] In the radio frequency system, the LNA is located at the forefront of the receiver. Its main function is to amplify the signal received from the antenna while ensuring that the signal-to-noise ratio of the subsequent circuit is affected as little as possible to ensure the normal operation of the entire system. Since the LNA is located at the forefront of the receiver, it is required that the noise figure of the LNA be as small as possible. In order to reduce the impact of the noise figure of the ...

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Problems solved by technology

[0008] However, since the differential LNA needs to amplify the signal difference between the two input terminals, compared with the single-ended LNA circuit, its volume is twice as large as that of the single-ended LNA circuit.

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