Miniaturized UWB Antenna

Abstract

The invention provides a miniaturized ultra-wideband antenna, which includes a dielectric substrate, metal patches on the upper and lower surfaces of the dielectric substrate, the metal patch on the upper surface is an antenna patch, and the metal patch on the lower surface is a microstrip feeder line. The antenna patch includes The grounding plate, the short branch and the long branch, the long and short branches include the inner groove line and the outer groove line, the center of the grounding plate is provided with a section of vertically slotted groove line, and the upper part of the groove line is connected to the inner groove line of the long branch, The bottom of the groove line is connected to the circular groove, the edge shape of the outer groove line and the inner groove line of the long and short branches adopts an exponential transition curve, and an exponential annular groove is formed between the outer groove of the long branch and the inner groove of the short branch. The overall space structure of the invention is compact, the antenna backplane is closely connected to the feeder line, and the radiation unit relies on the coplanar strip line coupling power supply, which meets the phase requirements while saving size and convenient design. An exponential ring slot is added to the antenna to transfer low frequency points The radiation is easy to understand and the miniaturized scheme is highly reproducible.

Description

technical field [0001] The invention relates to the technical field of miniaturization of planar printed microstrip antennas, in particular to how to realize miniaturization of an ultra-wideband antenna by adding an exponential annular groove structure without affecting the radiation performance of the original main structure. Background technique [0002] With the great 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 loading short-circuit probes, the third is active structure, and the fourth is slotting and slotting technology. The idea of ​​the first method is simple and clear. When the resonant frequency...

AI Technical Summary

Problems solved by technology

Due to the high requirements on the position of the short-circuit probe due to the impedance matching characteristics, it will add great difficulties to the manufacturing process, and this technology is used in a small number of occasions

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

The article "A miniaturized antipodal Vivaldi antenna with improved radiation characteristics" published in 2011 uses a tapered slotting technique, but the improved antenna size is 0.4λ 0 ×0.69λ 0 (λ 0 is the wavelength corresponding to the lowest resonance frequency) is still relatively large, and the article "ANovel Miniaturized Vivaldi Antenna Using Tapered Slot Edge with ResonantCavity Structure for Ultra-wide Band Applications" published in 2015 has been improved on the basis of the previous literature, adding A pair of resonant cavities further reduce the resonant frequency of the antenna, and the size is reduced to 0.25λ 0 ×0.43λ 0 , but there are some shortcomings in this method. 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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