Low Frequency Broadband Antennas for EMC Testing

Abstract

The low-frequency broadband antenna used for electromagnetic compatibility testing mainly includes a ground conductor plate (1), a pole plate (2) and a joint (3); the ground conductor plate (1) is laid flat on the ground, the pole plate (2) and the ground conductor plate (1) Vertical, the polar plate (2) and the ground conductor plate (1) constitute the two poles of the antenna; the length of the vertical projection (20) of the polar plate (2) on the ground conductor plate (1) is not less than the maximum operating wavelength 1 / 2 of ; the shape of the pole plate (2) is an irregular polygon, the shape of the exponential edge (21) of the polygon is an exponential shape, and the shape of the remaining edges is a straight line; the notch (24) extends into the pole plate (2) )internal. The antenna is small in size, light in weight and low in installation position, which is not only easy to install, but also reduces the requirements for test transmission power, reduces the cost of test equipment and test operation costs, and improves the uniformity of test field strength, test repeatability and Repeatability.

Description

technical field [0001] The invention relates to electromagnetic compatibility testing, in particular to a low-frequency broadband antenna for electromagnetic compatibility testing. Background technique [0002] The purpose of electromagnetic compatibility testing is to test the sensitivity of the tested electrical and electronic products or systems (collectively referred to as test items) to external electromagnetic fields. In the test, the transmitting antenna of the electromagnetic compatibility test needs to generate a uniform electromagnetic field in the area of ​​the test piece. According to the test standard ISO 11451-2 (Road Vehicle Vehicle Immunity Test Method for Narrowband Radiated Electromagnetic Energy Part 2: External Radiation Source Method), the working frequency band of the field generating device (transmitting antenna) used for the test is 20MHz to 18GHz . [0003] In the frequency range of 20MHz to 220MHz, although the logarithmic periodic broadband anten...

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Problems solved by technology

[0004] Technical problem: the present invention proposes a low-frequency broadband antenna for electromagnetic compatibility testing, which not only solves the problem of large antenna size, but also ensures that the antenna has good standing wave and radiation performance at low frequency and wide frequency band, and does not need a feeding matching network Or balun, which reduces the loss of response and has a large effective radiation power; and avoids the adverse effects of antenna height on the test, reduces the adverse effects of ground reflection on the uniformity of field strength in the test area of ​​the test piece, and makes the test piece on the ground , whether in the near or far zone of the antenna, can always be within the main lobe of the antenna

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