Broadband bandpass filter with frequency and bandwidth reconfigurable

Abstract

The invention discloses a broadband bandpass filter with frequency and bandwidth reconfigurable. The broadband bandpass filter comprises an upper-layer microstrip line structure, an active circuit, a middle-layer dielectric substrate, a lower-layer grounding metal paster and a metal through hole, wherein the metal through hole sequentially penetrates through the microstrip line structure, the dielectric substrate and the grounding metal paster so that the microstrip line structure and the grounding metal paster can be connected through the dielectric substrate, the microstrip line structure comprises a first port feeder line, a second port feeder line, a first resonator and a second resonator, the first port feeder line and the second port feeder line are symmetrical left and right, the first resonator is arranged above the first port feeder line and the second port feeder line, the second resonator is arranged below the first port feeder line and the second port feeder line, and the whole microstrip line structure is of a cross-shaped structure. The frequency and the bandwidth of the broadband bandpass filter can be independently reconfigurable, the two sides of a passband are each provided with a transmission zero point, the rectangularity and the selectivity of the filter are improved, and overall performance is good.

Description

technical field [0001] The invention relates to a broadband bandpass filter, in particular to a broadband bandpass filter with reconfigurable frequency and bandwidth applied in a broadband front-end system, belonging to the technical field of microwave communication. Background technique [0002] With the continuous development of modern wireless communication technology, the RF front-end often needs to integrate multiple wireless channels and communication standards. These wireless channels and communication standards not only have different center frequencies, but also have different bandwidth requirements. This requires a reconfigurable RF front-end with both frequency and bandwidth adjustment capabilities. Traditional tuning filters cannot freely adjust the bandwidth and cannot adapt to the requirements of modern wireless systems. For this reason, a filter with the ability to adjust the center frequency and bandwidth at the same time was proposed. Its English name is fu...

AI Technical Summary

Problems solved by technology

Most of the published existing technologies are designed based on narrowband filters, which cannot meet the needs of wideband reconfigurable communication systems. For wideband reconfigurable filters, the proposed methods and structures and the achieved performance are limited.

In addition, when the active device is loaded on the open resonator, the microstrip structure will inevitably introduce ground vias when combined with the active device. For the short-circuit resonator, the design of the active device is straightforward and simple, but some In order to achieve better performance and smaller size, the open circuit resonator should be given priority. Since it does not have a grounding point, the design is relatively difficult

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