Antenna structure and design method

Abstract

The invention discloses an antenna structure and a design method thereof. The antenna structure comprises a linear array radiation unit and a substrate integrated waveguide feeding network, wherein an output end of the substrate integrated waveguide feeding network is connected with an input end of the radiation unit, a substrate integrated waveguide power distributor is of a structure for dividing one path into six paths, the structure for dividing one path into six paths comprises an input passage and six output passages, a metal hole is formed in an inlet of each output passage and is used for adjusting power and phase of the output passage, and an outlet of each output passage is connected with the radiation unit. By the antenna structure, an intermediate-long combined antenna based on a compact feeding network is achieved, and the size of the feeding network is greatly reduced. By the antenna, the demands of intermediate-distance test and long-distance test of a radar can be simultaneously satisfied, a millimeter-wave switch is not needed to switch among various antennas, and meanwhile, the antenna structure has the advantages of compactness, low cost, low profile, small size and the like.

Description

technical field [0001] The invention relates to the fields of electronics, microwave radio frequency, radar and the like, and in particular relates to a structure and a design method of a novel array antenna. [0002] technical background [0003] status quo [0004] As a key component of the radar system, the antenna has a very important influence on the index performance of the whole system. There are three main types of ranging radars: long-range, medium-range, and short-range. According to the radar equation: detection of farther targets requires greater equivalent isotropic radiated power (EIRP), and actual conditions do not allow an unlimited increase in transmit power. If you want to detect longer distances, you need an antenna array with higher gain. In most application scenarios, it is hoped that the radar will work in multiple modes, that is, to meet the detection requirements of medium and long distances at the same time. The existing schemes generally have the...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the application of radar system for medium-range and long-range detection at the same time, several current technologies have related disadvantages: the use of millimeter-wave switches for switching will introduce large insertion loss, waste precious millimeter-wave power, and the switching of switches It also brings synchronization problems between different modes, increasing the complexity of the back-end algorithm

The use of phased array at the transmitting end requires the introduction of a phase shifting part, which makes the transmitting part circuit greatly complicated, increases the processing difficulty of the baseband circuit, and greatly increases the area and cost of the circuit board

The most important thing is that neither of the above two solutions can realize the radar system to work in the medium-range and long-range modes at the same time

The third solution is equivalent to using two sets of hardware to independently realize the function of medium and long-distance detection, which will greatly increase the cost, circuit area and complexity of baseband processing data

From the point of view of a medium and long-distance integrated antenna that has been disclosed so far, its feeding network has a large area, and it cannot realize arbitrary amplitude and phase feeding of ports.

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