broadband filter antenna

Abstract

A broadband filter antenna, including a five-layer structure from top to bottom, the first layer structure includes a top layer patch structure, the second layer structure includes a bottom layer patch structure, the third layer structure includes two folded resonators, and the fourth layer structure includes The layer structure is a large metal formation with a pair of via holes, and the fifth layer structure includes a feed structure. The present invention solves the problem of large plane size and realizes the filtering performance of the antenna; it uses stacked multi-chips combined with resonators to generate three A reflection zero point to expand the working bandwidth of the antenna; the odd mode of the resonator produces a low-end radiation zero point, and the coupling between the top and bottom patch structures produces a high-end radiation zero point, thereby achieving the effect of improving the frequency selectivity on both sides of the working frequency band; by adjusting The impedance ratio of the first part and the second part of the folded resonator can adjust the low-end radiation zero point under the premise of maintaining the bandwidth; use the short-circuit stub loaded on the feeder to suppress the high-order mode out of the band, so as to improve the high-end antenna frequency purpose of out-of-band suppression.

Description

technical field [0001] The invention relates to the communication field, in particular to a broadband filter antenna. Background technique [0002] With the rapid development of wireless communication technology, the requirements for antenna integration and miniaturization are increasing, and antennas integrating multiple functions have become a development trend. In most wireless communication systems, there is always a bandpass filter behind the receiving antenna and the two are cascaded with each other. Therefore, integrating the two to form a filter antenna can effectively reduce the number of components and reduce the noise caused by the filter. loss, improving the matching of the passband edge and increasing the overall efficiency. [0003] For filter antennas, many design techniques have been reported. For example, an impedance converter can be used to cascade the antenna and filter to realize the fusion of filtering and antenna functions; or the antenna can be used...

AI Technical Summary

Problems solved by technology

For the existing design technology, there are either problems of large size and low efficiency, or problems of narrow operating bandwidth

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