Narrow-band filter component

Abstract

The invention provides narrowband filter components comprising a primary frequency separating filter bank, a RF switch, a secondary frequency separating filter bank, which are in cascade connection sequentially; and the narrowband filter components further comprises a control appliance used for controlling the RF switch to carry out frequency band gating. The secondary frequency separating filterbank comprises secondary frequency band gating equipment and N filter banks based on resonators with higher harmonics and bulk acoustic wave, wherein, N is at least 2; the secondary frequency band gating equipment can adopt a RF power divider or a RF switch with the control appliance. The filter components have the following technical effects: the processing speed is high; the lateral dimension can be greatly reduced, so that the device dimensions are reduced, and the whole device volume can be made within 1 cubic centimeter; the working frequency is high and the devices can work in the rangeof 500 MHz-10 GHz; the number of the devices can be greatly reduced, so that the device dimensions are minimized; and the frequency band can be extremely tessellated.

Description

technical field [0001] The invention relates to a radio frequency filter group used in the field of wireless communication, in particular to a miniaturized radio frequency bulk acoustic wave narrowband filter group. Background technique [0002] The bandpass filter bank is a filter that divides the input signal into frequency components and outputs them separately. It plays an important role in the field of wireless communication. Its function is to separate the various frequency components contained in the received time signal. In the past, digital filters and LC filters were used to build filter banks. However, the speed of digital filters is too slow, and the adjustment of LC filters is difficult, especially to adjust the frequency response of many filters to different center frequencies with the same bandwidth. The situation is very difficult. Even if the adjustment is successful once, due to the instability of the LC element, it is difficult to guarantee that it will no...

AI Technical Summary

Problems solved by technology

In the past, digital filters and LC filters were used to build filter banks. However, the speed of digital filters is too slow, and the adjustment of LC filters is difficult, especially to adjust the frequency response of many filters to different center frequencies with the same bandwidth. The situation is very difficult. Even if the adjustment is successful, due to the instability of the LC element, it is difficult to guarantee that it will not change during use.

Although the surface acoustic wave filter bank has the advantage of fast speed, its problem is that the frequency is not high (below 1 GHz) due to the limitation of the finger electrode manufacturing process; in addition, it is necessary to separately prepare many narrow-band filters with different center frequencies and the same bandwidth. Filter, one is difficult to manufacture, and the other is that the volume cannot be made small

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