Microstrip serial-fed array antenna by combining shunt-fed power divider network

Abstract

The invention discloses a microstrip serial-fed array antenna by combining a shunt-fed power divider network. The microstrip serial-fed array antenna comprises four serial-fed arrays having same structures and a shunt-fed power divider network formed by a first-stage T type power divider and a second-stage T type power divider. The input terminal point of the first-stage T type power divider serves as a feeding point and the output terminal of the first-stage T type power divider is connected with all serial-fed linear arrays respectively by the second-stage T type power divider. The output terminal of the first-stage T type power divider is connected to the input terminal of the second-stage T type power divider by a connection assembly, so that the phase difference between the two stagesof T type power dividers is adjusted to be 180 degrees. The microstrip serial-fed array antenna has advantages of simple structure, low needed cost, good capability of realizing an end point feedingmode, and good directional diagram characteristic.

Description

technical field [0001] The invention relates to the technical field of microstrip antennas, in particular to a microstrip series-fed array antenna combined with a parallel-fed power distribution network. Background technique [0002] Microstrip series-fed array antennas have been widely used in 24GHz and 77GHz vehicle radars due to their simple structure, small size, low insertion loss, easy integration, and low cost. The microstrip series fed array antenna is divided into two feeding methods, one is the center feeding method, that is, the feeding point is located in the middle position, and when the center feeding method is combined with the power distribution network, the series feed line array is in the center Inverted phase feeding, connecting several series feeder arrays to form an area array through a parallel feed network, the array feed point is located in the middle of the array, which can obtain excellent pattern characteristics, but this type of method is not suit...

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Problems solved by technology

Since the T-junction is the main radiation source of the parallel feed power distribution network, such as figure 1 The front and rear two-stage T-type power splitters shown are directly connected by a horizontal transmission line, and the parallel feed power splitter network can be equivalent to a linear array composed of three radiation sources, and the radiation intensity of the middle radiation source is equal to the intensity of the radiation sources on both sides. And, the parallel feed power distribution network has discontinuity, which will produce significant spurious radiation at 24GHz and 77GHz, thus affecting the antenna pattern characteristics

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