A Tunable and Reconfigurable Bandpass Filter

Abstract

The invention provides an adjustable and reconfigurable band-pass filter. The adjustable and reconfigurable band-pass filter comprises a substrate, and a first resonance unit, a second resonance unit, a third resonance unit, a fourth resonance unit, an input end and an output end which are arranged on the substrate, wherein the first resonance unit, the second resonance unit, the third resonance unit and the fourth resonance unit have the equal resonance frequencies, and are connected in a coupling manner in sequence; the input end is connected with the first resonance unit in a coupling manner; the output end is connected with the fourth resonance unit in a coupling manner; variable-capacitance circuits are arranged at one ends of the first resonance unit, the second resonance unit, the third resonance unit and the fourth resonance respectively; and switching circuits are arranged at the other ends of the second resonance unit and the third resonance unit respectively. According to the band-pass filter provided by the invention, the adjustable and reconfigurable characteristics of a resonance passband can realized; and in addition, the band-pass filter is simple to operate and convenient to use.

Description

technical field [0001] The present invention relates to the technical field of microwave communication, and more specifically, relates to an adjustable and reconfigurable bandpass filter. Background technique [0002] With the rapid development of modern wireless communication systems, the contradiction of spectrum congestion has become increasingly prominent. In order to improve the availability of spectrum resources, spectrum technologies such as multi-passband, spread frequency hopping and dynamic frequency allocation are widely used, which greatly promotes the development of fast electronically adjustable or electrically reconfigurable filters. At the same time, the rapid development of modern wireless communication technology puts forward higher and higher design requirements for the multi-function and miniaturization of wireless electronic equipment. [0003] However, traditional fixed filters usually require a combination of multiple filters of different frequency ba...

AI Technical Summary

Problems solved by technology

However, this method not only doubles the size of the radio frequency transceiver, but also increases its power consumption and cost, which is not in line with the mainstream trend of miniaturization and low cost of the current radio frequency front-end circuit of the receiver.

At the same time, when using this type of filter, when a certain frequency band is not needed, the operation is cumbersome and cannot be adjusted immediately

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