Miniaturized and circularly polarized patch antenna

Abstract

The invention discloses a miniaturized and circularly polarized patch antenna, including: a patch having a first side, a second side, a third side opposite to the first side, and a four side oppositeto the second side; a ground plate formed below the patch; a first metal connection line electrically connected to the first side of the patch and the ground plate; a second metal connection line electrically connected to the second side of the patch and the ground plate; a third metal connection line electrically connected to the third side of the patch and the ground plate; and a fourth metal connection line electrically connected to the fourth side of the patch and the ground plate. The patch, the first metal connection line, the ground plate, and the third metal connection line are in electrical communication to form a first annular resonant body. The patch, the second metal connection line, the ground plate, and the fourth metal connection line are in electrical communication to forma second annular resonant body. The first annular resonant body and the second annular resonant body are arranged crosswise. The miniaturized and circularly polarized patch antenna has a small size, simple structure, a simple manufacturing process, low weight, low cost, good debuggability, and no need for a high dielectric constant material.

Description

technical field [0001] The invention relates to the technical field of communication antennas, and specifically proposes a miniaturized and circularly polarized patch antenna, which can be used in the fields of new generation satellite positioning and satellite communication. [0002] technical background [0003] Patch antennas are widely used in wireless communication technology, especially in mobile communication, vehicle communication, satellite communication and other fields. [0004] Such as Figure 1a and 1b As shown, a conventional patch antenna 100 is mainly composed of a patch 102 , a dielectric substrate 104 and a ground plate 106 . The patch 102 is placed parallel to the ground plate 106 with a distance equal to the thickness of the dielectric substrate 104 . The length and width of the patch 102 are a and b respectively, and the length of the patch 102 is generally half a wavelength, so as to generate a resonance mode and determine the operating frequency. The...

AI Technical Summary

Problems solved by technology

[0010] 1) Although the above technology effectively reduces the size of the antenna, the overall structure of the antenna is relatively complicated, which requires high manufacturing process and increases the manufacturing cost

Especially in reconfigurable antennas, the use of active components greatly increases their complexity and cost

[0011] 2) The tuning capability of the above technology is limited, and the antenna frequency can only be reduced to a limited frequency range, so the ability to miniaturize the antenna is also greatly limited, that is, the volume and weight of the antenna are still large

[0012] 3) Most of the methods in the above technologies are difficult to achieve circular polarization characteristics, which cannot meet the application in the new generation of information fields such as satellite communication and high-precision positioning

However, as shown above, the disadvantages of ceramic antennas are mainly in terms of high cost and heavy weight

In addition, they have the characteristics of narrow bandwidth and non-adjustability, which make it difficult to compensate for mismatches in various application scenarios (including polarization mismatch, impedance mismatch, frequency shift, etc.) and mismatches caused by processing errors, making it difficult to guarantee performance optimization

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