Dual Polarized Filter Patch Antenna

Abstract

The invention discloses a dual-polarization filter patch antenna. The dual-polarization filter patch antenna comprises a metal patch, a top dielectric substrate, an intermediate metal sheet, an underlying dielectric substrate and a metal ground. The metal patch is provided with four grooves, an integrated structure formed by the intermediate metal sheet, the underlying dielectric substrate and themetal ground is provided with a plurality of metallized via holes to form a substrate integrated resonant cavity; the two sides of the metal ground are respectively provided with coplanar waveguide feed lines, feed lines excite a pair of orthogonal degenerate modes in a signal feed cavity and pass through a cross recess on the intermediate metal sheet to be coupled to the orthogonal degenerate modes on the metal patch to allow the antenna to obtain second-order filtering response on two polarizations and to have the polarization isolation features, the antenna has the same performances on thetwo polarizations, the structure is simplified, the lengths and the positions of the four grooves are changed to change the external quality factors required on the polarizations, and the isometric coupling line of the terminal short circuit in parallel with the feed lines can generate one radiation zero points at the two ends of the passband to improve the frequency selectivity of the antenna.

Description

technical field [0001] The invention relates to the communication field, in particular to a dual-polarization filter patch antenna. Background technique [0002] Filter patch antennas are widely used in wireless communication systems because of their multiple functions, high integration, low cost, and high overall efficiency. For filter patch antennas, many design methods have been reported so far. One is to achieve antenna filtering performance by using a stacked patch structure to introduce radiation nulls. This method can obtain higher antenna gain, but its design process is complicated and it is difficult to achieve multi-order filter responses. Another method is to use a matching structure to integrate the filter and the patch antenna to form a filter patch antenna. This method can obtain a multi-order filter response but has a large volume and low efficiency. The filter patch antenna obtained by replacing the last resonator of the filter with an antenna can take into...

AI Technical Summary

Problems solved by technology

However, this type of antenna lacks the adjustment means of dual-polarization external quality factor. When the bandwidth requirement changes, the quality factor cannot be effectively adjusted accordingly.

[0004] In short, the problems of various existing dual-polarization filter patch antennas are summarized in the following aspects: 1) The performance consistency on the two polarizations is poor; 2) Using the two polarizations separately The resonator increases the complexity of the structure; 3) lacks the regulation method of the external quality factor required by dual polarization; 4) the port isolation needs to be further improved

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