Miniaturized Vivaldi antenna based on bent branch loading technology

Abstract

The invention provides a miniaturized Vivaldi antenna based on a bent branch loading technology, which comprises a dielectric substrate and metal patches covering the upper surface and the lower surface of the dielectric substrate respectively, wherein the metal patch on the lower surface is a microstrip feeder; the metal patch on the upper surface comprises a ground plate; conical sheets and bent branches are horizontally symmetrically arranged above the ground plate; the conical sheet is formed by an inner slot line, an outer slot line and a right angle in a surrounding mode; the center axis of the ground plate is provided with a section of vertical slot line; the inner slot line of the conical sheet is connected above the slot line; a round slot is connected below the vertical slot line; the inner slot line and the outer slot line are exponential type curves; and each bent branch is formed by a vertical branch and a transverse branch in a mutual vertical splicing mode. the whole space structure of the antenna is compact, side feed is adopted, and the space occupied by the antenna in the vertical direction is reduced; through increasing one pair of bent branches, extra resonant frequency points are added in a low frequency band, the bandwidth of the antenna is widened, understanding is easy, and the miniaturization scheme of the antenna has strong portability.

Description

technical field [0001] The invention relates to the technical field of planar printing ultra-wideband miniaturization, in particular to a miniaturized Vivaldi antenna based on bending stub loading technology. Background technique [0002] With the rapid development of wireless communication technology, people have higher and higher requirements on the portability of wireless communication equipment, which prompts the development of wireless communication equipment in the direction of miniaturization. [0003] So far, there are four main methods in the industry to solve the above problems: one is to use a dielectric board with a high dielectric constant. The second is symmetrical half cutting technology, the third is the use of active structure, and the fourth is slotting and slotting technology. The first method is because the resonant frequency of the antenna is inversely proportional to the square root of the effective dielectric constant of the dielectric substrate, so t...

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Problems solved by technology

However, this method is easy to cause the deterioration of impedance matching, and also leads to the asymmetry of the antenna pattern due to the asymmetry of the antenna structure after the half-cutting process.

The third method is not only complex in structure, but also the addition of active structures will virtually increase the volume of the device

However, this method also has some shortcomings. Impedance matching has relatively high requirements on the size and position of the resonant cavity, and the original antenna structure must have enough reserved space to realize this function, so that its length cannot be further shortened.

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