A Miniaturized VHF Monopole Type Antenna

Abstract

The invention discloses a small-sized very-high frequency monopole antenna. The small-sized very-high frequency monopole antenna comprises metal foils which are sequentially overlapped from top to bottom along the symmetry center, wherein a slot antenna unit is formed in each metal foil, is formed by connecting a circular slot ring with two T-shaped coplanar waveguides, and is positioned in the symmetry center of each metal foil; the perimeter of each circular slot ring is lambda e / 10; each slot antenna unit, viewed from the upper and lower surfaces of the corresponding metal foil, is transparent; each metal foil is attached to the surface of a microwave ceramic dielectric plate; a feed probe is loaded in the symmetry center of each metal foil; four short circuit probes with the same radius are loaded in the 45-degree surrounding direction of the feed probe at equal column intervals and equal row intervals in a periodic arraying mode. The operation bandwidth of the small-sized very-high frequency monopole antenna is in a coverable range of 118 to 136MHz. The small-sized very-high frequency monopole antenna is a very-high frequency antenna which is easy to process, small in size and convenient to integrate, can meet requirements of very-high frequency antennae for civil aviation and military aviation, and can particularly meet military requirements for streamlining of an aircraft body to achieve stealth characteristics.

Description

technical field [0001] The invention relates to a VHF monopole type antenna, more specifically a monopole type with small volume, simple structure and easy processing, gain better than 3dB, and bandwidth that can work between 118-136MHz omnidirectional antenna. Background technique [0002] Monopole antenna, English name: MonopoleAntenna, is a classic vertical polarization, omnidirectional radiation antenna, which is composed of a quarter-wavelength metal tube and a metal ground plane, with large bandwidth and good vertical polarization characteristics And other advantages are widely used in aviation VHF communication antenna. [0003] According to the document "Modern Antenna Design", there are many ways to realize the miniaturization of monopole antennas. The common methods are as follows: (1) Using top-loading technology, such as: L-shaped antenna, patch top-loading, etc. ; (2) Disc-cone antenna, which can be said to be a deformation of the monopole antenna, is to repla...

AI Technical Summary

Problems solved by technology

[0004] The top loading technology can effectively reduce the height of the monopole antenna, but the disadvantage is that it leads to high Q value and narrow bandwidth; the disc cone antenna and inductive loading technology can expand the antenna bandwidth, but for the ability to reduce the height of the monopole antenna In addition, the impedance bandwidth of this type of antenna is much better than the pattern bandwidth; the loading technology of periodic artificial electromagnetic structures is a popular academic research in recent years, but this structure is limited to the number of periodic units to appear very good The dispersion effect of the paper is only published in the millimeter wave band, and the application in the centimeter wave and meter wave still needs further improvement

[0005] At present, the technical approach to realize the miniaturization of monopole antennas is mostly top-loading technology, that is, loading inductors, capacitors or combined components on the top of the monopole to generate new resonance frequencies in the low frequency band to reduce the size of the antenna. This method Not only will there be many resonant frequencies around the operating frequency of the antenna, but also the loading of components will reduce the performance of the antenna, which cannot meet the multi-faceted requirements of antenna miniaturization, bandwidth, and gain at the same time, and the top-loaded monopole antenna is in shock vibration In the case of high requirements, the reliability of the antenna will be greatly reduced

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