Array antenna apparatus

Abstract

[Purpose] To provide an antenna device of high radiation efficiency, which has a wide-angle radiation pattern and which does not give rise to a null in the vicinity of the front surface of the antenna. [Solution] An array antenna device (1) having a plurality of radiating elements, wherein the device has: a dielectric substrate (2); two or more series array antennas formed on the dielectric substrate, and including a plurality of radiating elements (11-13, 21-23) connected in series by conductor lines (15, 25); a distributor (30) formed in a different layer from the layer in which the series array antennas (10, 20) are formed on the dielectric substrate, for distributing power to the two or more series array antennas through capacitive coupling; and phase shifters (conducting lines (34-37)) for shifting the phase of the power distributed by the distributor.

Description

technical field [0001] The present invention relates to an array antenna formed by arranging a plurality of wide-angle antennas applicable to devices that radiate radio waves, and also relates to a wide-angle antenna and an array antenna particularly suitable for use in radar devices mounted on automobiles. Background technique [0002] Radars for detection of people and objects can be used in a wide range of applications. Among them, in order to assist the safe running of automobiles, the development of devices that use radar to monitor obstacles and the like (objects) around automobiles is being promoted. As this kind of car peripheral monitoring radar, technologies such as BSD (Blind Spot Detection: Blind Spot Detection) that assist blind spot detection and CTA (Cross Traffic Alert: Cross Traffic Alert) that alert people or oncoming vehicles in a head-on collision are put into practical use. change. These automotive peripheral monitoring radars are sometimes required to...

AI Technical Summary

Problems solved by technology

As described in the "Prior Art" column of this patent document 1, in the case of using a T-branch line of a simple structure to form a feeder circuit, due to the influence of the radiation element or the reflected wave of the feeder line, the power of the T-branch line The distribution characteristic will deviate from the expected value, and the excitation distribution of each radiating element will be disturbed relative to the expected value, sometimes deteriorating the radiation characteristic of the antenna

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