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Electric tunable filter with constant absolute bandwidth

A technology for tuning filters and bandwidths, applied in the field of tunable filters, it can solve the problem of ignoring absolute bandwidth, and achieve the effect of keeping the absolute bandwidth constant and satisfying the effect of maintaining the absolute bandwidth.

Active Publication Date: 2017-08-11
南京三航信息工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on electrically tunable filters mainly focuses on the adjustable center frequency, but ignores the change of absolute bandwidth during tuning.

Method used

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  • Electric tunable filter with constant absolute bandwidth
  • Electric tunable filter with constant absolute bandwidth
  • Electric tunable filter with constant absolute bandwidth

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Embodiment Construction

[0022] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0023] Those skilled in the art can understand that unless otherwise defined, all terms used herein have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein Explanation.

[0024] An electrically tunable filter with constant absolute bandwidth includes a dielectric substrate 1. The present invention uses a PCB board with a relative permittivity of 2.2 and a thickness of 0.508mm as the dielectric su...

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Abstract

The invention discloses an electric tunable filter with a constant absolute bandwidth. The whole electric tunable filter is of a symmetric structure and an equal size. The overall structure of the electric tunable filter is composed of three layers, namely, an upper layer, a middle layer and a lower layer. The upper layer of the electric tunable filter is a microstrip line circuit which comprises a feed line (11), a feed line (12), a resonator I, a resonator II and a direct current feed. The middle layer of the electric tunable filter is a dielectric substrate which comprises multiple metalized through holes. The lower layer of the electric tunable filter covers metal copper. The electric tunable filter is characterized in that the central frequency is continuously tunable in a certain range, and the absolute bandwidth is maintained constant at the same time.

Description

technical field [0001] The invention relates to the field of tunable filters, in particular to an electrically tunable filter with constant absolute bandwidth. Background technique [0002] Filters are an indispensable part of modern microwave relay communication, microwave satellite communication, electronic countermeasures and other systems, and they are also the most important microwave passive devices with the highest technical content. At present, the research on electrically tunable filters mainly focuses on the adjustable center frequency, but ignores the change of absolute bandwidth during tuning. However, in practical applications, the bandwidth of the communication system is fixed, which requires the electrically tunable filter to keep the absolute bandwidth constant when switching the operating frequency, so the research on the electrically tunable filter with constant absolute bandwidth has practical significance. Contents of the invention [0003] The purpos...

Claims

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 周永刚黄晓栋戴宗昆
Owner 南京三航信息工程有限公司
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