Dual-band antenna

Abstract

The invention relates to a dual-band antenna. The dual-band antenna is of a stacked structure and sequentially comprises a first patch antenna device, a first dielectric layer, a second patch antenna device, a second dielectric layer and a ground plane element from top to bottom, wherein the first patch antenna device is used for receiving and sending signals in a first frequency band, and the second patch antenna device is used for receiving and sending signals in a second frequency band; frequency of the first frequency band is larger than that of the second frequency band, and the dielectric constant of a dielectric material of the first dielectric layer is greater than that of a dielectric material of the second dielectric layer. According to the dual-band antenna, stacked layer media of the dual-band antenna can be thinned, cost is lowered, the size of the dual-band antenna is reduced, meanwhile, the coupling degree of two patches is reduced, and a good gain mode and polarization characteristics can be obtained.

Description

technical field [0001] The invention relates to antennas, in particular to a dual-frequency antenna. Background technique [0002] Navigation is the process of guiding the carrier to sail along a certain route. Its realization depends on certain equipment or systems. The equipment that can complete this guiding function is called navigation equipment or system. As the key component of the satellite navigation and positioning system, the antenna is the gateway for the electromagnetic waves in the air to enter and exit the communication equipment, which directly affects the performance of the entire system. Therefore, it is very necessary and meaningful to study the antenna in the satellite navigation and positioning system. [0003] The existing navigation system GNSS (Global Navigation Satellite System), including GPS, Glonass and other systems, the GNSS signal is in the center of the two frequency bands L1 and L2, the antenna must cover these two frequency bands to obtain ...

AI Technical Summary

Problems solved by technology

This makes for a nice compact solution, but the bandwidth is narrow due to the high dielectric constant, and they don't provide good reception characteristics for GPS and GLONASS unless the ceramic is very thick

This adds cost and creates problems with coupling between the two patches, which makes it difficult to obtain the correct gain pattern and polarization characteristics

Another problem is to use a single feed point on both patches to reduce the influence of the upper patch's feed point on the lower patch, which relies on a double resonant patch and the phase difference of this double resonance is accurate at the center frequency of 90 degrees also limits the bandwidth over which the antenna can operate with the correct polarization

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