Dual-layer dual-mode and dual-passband band-pass filter

Abstract

The invention discloses a dual-layer dual-mode and dual-passband band-pass filter which comprises three layers of circuit structures and is formed by a single-face microwave dielectric substrate and a double-face microwave dielectric substrate in a combined mode. A metal face, facing towards the single-face microwave dielectric substrate, of the double-face microwave dielectric substrate is a public area and is provided with a plurality of empty slots. A metal face of the single-face microwave dielectric substrate is provided with a first paste resonator. Two gaps which are in orthogonality and different in length are arranged on the first paste resonator. A metal face, facing backwards of the single-face microwave dielectric substrate, of the double-face microwave dielectric substrate is provided with a second paste resonator, and the second paste resonator and the first paste resonator are the same in structure and are distributed symmetrically. Frequency of dual passbands can be controlled through the lengths of the gaps on the first paste resonator, and coupling coefficients of the two passbands can be controlled through sizes of the empty slots in the public area.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a multilayer double-mode double-pass band-pass filter. Background technique [0002] With the rapid development of wireless communication systems, microwave dual-passband or multi-passband filters have received great attention. One resonant unit of the dual-mode resonator can function as two resonators, so that the size of the circuit can be greatly reduced while ensuring that the performance of the circuit is not affected. At present, a variety of design methods have been intensively studied, and a variety of dual-mode resonators have been verified, such as patch resonators, rectangular rings, and stub-loaded half-wavelength resonators, which have been widely used in dual-mode In the design of pass band band pass filter. [0003] In the design of dual-passband filters, it is difficult to independently control the resonant frequency and coupling coefficient of the two pas...

AI Technical Summary

Problems solved by technology

In previous designs, the dual-passband filter scheme using the fundamental and harmonic designs generally cannot achieve two closer passbands

The scheme of using two sets of resonators with different resonant frequencies to design a dual passband filter has the disadvantages of complex design and large size

At present, there is still a lack of a simple coupling topology to design a dual-mode dual-passband filter that can independently control the two passband frequencies and coupling coefficients

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