Balanced type band-shaped dielectric substrate integrated filter

Abstract

The invention discloses a balanced type band-shaped dielectric substrate integrated filter. The balanced type band-shaped dielectric substrate integrated filter comprises a high-dielectric-constant dielectric substrate, and a first low-dielectric-constant dielectric substrate, a second low-dielectric-constant dielectric substrate and a metal ground which are symmetrically stacked on the upper and lower surfaces of the high-dielectric-constant dielectric substrate respectively. Compared with an existing balanced dielectric filter, the balanced type band-shaped dielectric substrate integrated filter is advantageous in that the high-Q-value strip-shaped dielectric substrate integrated resonator with a packaging characteristic which works in a TM111 mode, is mainly composed of a double-groove loaded strip-shaped dielectric block, and is combined with an upper-layer air groove structure, a lower-layer air groove structure and a packaging substrate is adopted, the problems that the cost is high and self-packaging cannot be realized when an existing balanced type dielectric filter is realized by combining a ceramic dielectric with a metal cavity structure are solved, and the balanced type band-shaped dielectric substrate integrated filter with low loss characteristics is realized; and meanwhile, the filter has the advantages of self-packaging, high integration level and low cost.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a balanced strip dielectric substrate integrated filter. Background technique [0002] In a balanced system, compared with the traditional single-ended filter, the balanced filter can not only be directly connected with other balanced circuits, but avoid adding multiple baluns, which is conducive to the miniaturization, high performance, and low cost of microwave circuits. Cost development trend, and can improve the system's anti-interference ability, harmonic suppression, reliability, cross-polarization, etc. Therefore, balanced filters have attracted extensive attention. In addition, dielectric resonators have become a research hotspot in recent years because of their advantages such as high Q value, high temperature stability and high power capacity. Therefore, it is of great research value and significance to apply dielectric resonators to balanced filters to construc...

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the above-mentioned prior art, a balanced strip dielectric substrate integrated filter is proposed to solve the problem that when the existing balanced dielectric filter is realized through a ceramic dielectric combined with a metal cavity structure, the cost is high and self-encapsulation cannot be realized The problem

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