Tri-band integrated antenna

Abstract

The invention discloses a tri-band integrated antenna. The antenna consists of two parts, namely an L / S radiating unit and an ultra-high frequency (UHF) radiating unit, wherein the L / S radiating unit comprises a plurality of metal sleeve feed probes, an L / S feed network, an upper radiating piece, a lower radiating piece and a reflection chamber; the UHF radiating unit comprises a plurality of spiral lines, a supporting sleeve, a feed connecting part, an UHF feed network and a base; the spiral lines are wound on the supporting sleeve; the bottom ends of the spiral lines are connected with the output port of the UHF feed network through the feed connecting part; and the UHF feed network is arranged in the base. The antenna provided by the invention has high phase centre stability, a compact structure and a small size, and can cover UHF, an L-band and an S-band, and meet the requirements of spaceborne or airborne.

Description

technical field [0001] The invention relates to an antenna, in particular to a three-frequency integrated antenna. Background technique [0002] With the development of Pan-Star measurement technology, it is required that the antenna can work in a wide frequency band or even multiple frequency bands to receive or transmit signals in different frequency bands. Strict requirements, and in order to ensure measurement accuracy, the antenna is also required to have high phase center stability. Therefore, high-performance, compact tri-band or multi-band antenna technology has become an urgent problem to be solved at present. [0003] The current tri-frequency or multi-frequency antennas generally use microstrip stack antennas based on medium loading, such as the patent "a tri-band circularly polarized stack microstrip antenna" (application number: CN201020274629.2), and the patent "a Design of Tri-band Dual Circular Polarization GPS Microstrip Patch Antenna" (application number:...

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Problems solved by technology

[0003] However, the current tri-band or multi-band antenna generally adopts a microstrip stacked antenna based on dielectric loading, such as the patent "a tri-band circularly polarized stacked microstrip antenna" (application number: CN201020274629.2), and the patent "a The Design of Three-band Dual Circular Polarization GPS Microstrip Patch Antenna" (application number: CN200710099068.X), this type of antenna reduces the volume and cost of the antenna while meeting the requirements of multi-band work, but this type of antenna The radiation efficiency is low, the mutual coupling between each frequency point is serious, and debugging is difficult. At the same time, due to the direct feeding of the probe, the coverage bandwidth of each frequency band is narrow, and the stability of the phase center is poor.

The patent "Planar Tri-Band Antenna" (Application No.: CN200620068895.3) and the patent "New Tri-Band Planar Inverted-F Antenna" (Application No.: CN200910199589.1) adopt the form of planar microstrip slotting and adding parasitic units. It can also couple multiple frequencies, but this type of antenna can only radiate linearly polarized electromagnetic waves, and it occupies a large installation area in the UHF frequency band

At the same time, the above-mentioned three-band or multi-band antenna generally uses microwave dielectric material as the substrate, and its dielectric constant has a great influence on the performance of the antenna, and in the environment of alternating cold and heat in the space, there may be problems between the metal clad copper and the microwave dielectric board. Phenomena such as warping and falling off, the reliability is low, and it is not suitable as a spaceborne antenna

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