Built-in capacitive cross coupling filter

Abstract

The invention discloses a built-in capacitive cross coupling filter which includes a body, and the body comprises a lower body and an upper body. An input electrode and an output electrode are arranged on a front end face of the lower body. A first resonant cavity, a second resonant cavity and a third resonant cavity which are horizontally arranged at equal intervals are arranged between the inputelectrode and the output electrode. First silver layers are arranged on the front end face and located on the outer rings of the first resonant cavity, the second resonant cavity and the third resonant cavity. A second silver layer is arranged between contact faces of the lower body and the upper body, two ends of the second silver layer extend to the first resonant cavity and the third resonantcavity, and the lower body and the upper body are bonded and sintered into an integrated structure. The built-in capacitive cross coupling filter can realize a larger coupling amount.

Description

technical field [0001] The invention relates to a coupling filter, in particular to a built-in capacitive cross-coupling filter. Background technique [0002] In microwave circuits, cross-coupled filters can be used to filter signals. The current capacitive cross-coupling filter includes a body, an input electrode and an output electrode are arranged on the front face of the body, and three resonant cavities are arranged side by side between the input electrode and the output electrode, and the periphery of the resonant cavity is arranged with The first silver layer, and the strip-shaped second silver layer is arranged above the three resonant cavities on the front end surface, so that the flow direction of the signal is input through the input electrode, and then coupled through the three resonator cavities in turn and transmitted to the output electrode , and the resonant cavities located on both sides are then transmitted to the output electrode through the coupling betw...

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Problems solved by technology

[0003] However, this filter has the following disadvantages: the spacing t between the second silver layer and the first silver layer affects the coupling amount, the smaller the spacing, the greater the coupling amount, and the larger the spacing, the smaller the coupling amount

However, because the silver layer pattern is printed, it is impossible to achieve a small spacing, generally about 0.3mm, so this solution cannot achieve a large coupling amount

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