Eight-arm spiral circularly-polarized dual-band antenna applicable to laser direct forming technology

Abstract

The invention provides an eight-arm spiral circularly-polarized dual-band antenna applicable to a laser direct forming technology. The eight-arm spiral circularly-polarized dual-band antenna comprisesan antenna dielectric body, an antenna resonance body which is matched with the antenna dielectric body, and an antenna circuit board which is connected with and arranged at the bottoms of the antenna dielectric body and the antenna resonance body, wherein the antenna dielectric body is a 12-prism object, wherein the side surfaces of the antenna dielectric body consist of 12 equivalent faces; theantenna resonance body is arranged on the antenna dielectric body; the antenna resonance body is arranged around the antenna dielectric body; the antenna resonance body comprises four high-frequencyspiral arms, including a first high-frequency spiral arm, a second high-frequency spiral arm, a third high-frequency spiral arm and a fourth high-frequency spiral arm, and four low-frequency spiral arms, including a first low-frequency spiral arm, a second low-frequency spiral arm, a third low-frequency spiral arm and a fourth low-frequency spiral arm in four groups; each group comprises a high-frequency spiral arm and a low-frequency spiral arm; and the antenna resonance body consists of a conductive body. The eight-arm spiral circularly-polarized dual-band antenna is wide in frequency band,can be produced and manufactured easily, low in elevation and high in gain, and suitable for satellite both-way communication.

Description

technical field [0001] The invention relates to the field of microwave technology and antennas, and in particular to an eight-arm helical circularly polarized dual-frequency antenna suitable for laser direct forming technology. Background technique [0002] Existing four-arm helical antennas are divided into short-circuit type and open-circuit type. All have the characteristics of wide beam circular polarization and high gain at low elevation angles. The beam of the short-circuit type is wider than that of the open-circuit type, and the gain in one direction is not as high as that of the open-circuit type. But there are shortcomings of narrow frequency bandwidth. In terms of technology, most of the four-arm helical antennas are realized by wrapping a cylinder with a flexible circuit board or winding a copper wire. For narrow-bandwidth antennas, the dimensional tolerance control of the above process is relatively poor, which can easily cause impedance mismatch and frequenc...

AI Technical Summary

Problems solved by technology

For narrow-bandwidth antennas, the dimensional tolerance control of the above process is relatively poor, which can easily cause impedance mismatch and frequency drift, resulting in product quality degradation or low yield

[0003] There are also some spiral antennas that are realized by printing silver paste. Due to the complicated printing process, the silver paste needs to be dried after printing to print the other side. Most of them are only for flat or simple curved surface products, and the pattern connection between the surface and the surface It is difficult to control the accuracy

The more common printed ceramic antennas, although miniaturized, have narrower bandwidths and are mostly only suitable for receiving antennas

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