active antenna device

Abstract

The invention discloses an active antenna module. The active antenna module comprises a loop antenna, a radio frequency transistor, an inductor-resistor serial circuit, a first bypass capacitor and a second bypass capacitor. The radio frequency transistor is provided with a control port, a first port and a second port. The two end points of the loop antenna are respectively in electrical connection with one from the control port and the second port which have opposite phases, the second port is electrically connected with the first port via the first bypass capacitor, the first port is grounded via the inductor-resistor serial circuit, and the second bypass capacitor is connected in parallel with a resistor of the inductor-resistor serial circuit.

Description

technical field [0001] The invention relates to an active antenna device, in particular to an active antenna device with its own mixing and demodulation structure. Background technique [0002] From ancient times to the present, the continuous development of means of transportation is one of the driving forces behind the development of human civilization. The evolution of various means of transportation has shown that means of transportation play an indispensable driving force in the history of the development of human civilization. With the continuous advancement of technology, the performance of today's vehicles is getting better and better, human mobility is getting stronger, and there are more and more dynamic road conditions. So a variety of automotive electronic products with different road traffic monitoring functions have emerged as the times require. [0003] Conventional microwave radio frequency detectors are all designed independently of the antenna and the rad...

AI Technical Summary

Problems solved by technology

However, if the carrier frequency is increased, the 3dB beamwidth of the antenna will become smaller, which is not conducive to the detection of moving objects in a wide-angle environment

When using a single-antenna architecture, although the volume must be smaller than that of a dual-antenna architecture, the cost will be higher than that of a dual-antenna architecture because a gyrator must be used.

At the same time, the maximum isolation of the reverse path is only 35dB, which is obviously lower than that of the dual-antenna architecture, and it is not possible to add power amplifiers or other unidirectional components at the transmitting end.

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