BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the technology field of micro-electro-mechanical (MEMS) systems technology, and more particularly to an even-mode resonator filter with high stability.

2. Description of the Prior Art

With the advancement of the communications industry and technology, the market's demand for filters has been developed towards miniaturization and high inhibition rate of noise signal. However, with the miniaturization of filters, the size and cutting errors will increase during the production process.

As the electronic engineers skilled in filter and communication components well know, when the inside structure of the coupled filter is asymmetrical due to the size or cutting errors, the coupled filter will become the odd mode, thereby decreasing the inhibition rate of noise signal. Wherein the reasons for the inside structure asymmetry of the filter including asymmetry of input end and output end, position shifted of sheet metals, asymmetry of sheet metal size, and cutting error. It is extrapolated that, how to redesign and improve the foregoing situation and provide a filter with high quality factor has become an important issue of related companies and market.

In view of that, inventors of the present application have made great efforts to make inventive research and eventually provided an even-mode resonator filter with high stability.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an even-mode resonator filter with high stability. The even-mode resonator filter comprises: a first even-mode resonance module, a second even-mode resonance module, a first filter unit, and a second filter unit. Wherein a first resonance unit and a second resonance unit of the first even-mode resonance module are both coupled between an input end and an output end. The first resonance unit is electrically connected with the second resonance unit in parallel. Moreover, a third resonance unit of the second even-mode resonance module is electrically connected between the first resonance unit and the input end. A fourth resonance unit of the second even-mode resonance module is electrically connected between the second resonance unit and the output end, and is electrically connected to the third resonance unit in parallel. According to the electrical connection design between the fourth resonance unit and the third resonance unit, and the second resonance unit and the first resonance unit, the even-mode resonator filter of the present invention includes the advantages of high quality factor and high inhibition rate of noise signal.

In order to achieve the primary objective of the present invention, the inventor of the present invention provides an embodiment for the even-mode resonator filter, comprise:a first even-mode resonance module, comprising:a first resonance unit, having a first end and a second end, and the first end and the second end being coupled to an input end and an output end, respectively;a second resonance unit, being coupled between the input end and the output end, and being electrically connected with the first resonance unit in parallel;a second even-mode resonance module, being coupled to the first even-mode resonance module, and comprising:a third resonance unit, being electrically connected between the first resonance unit and the output end;a fourth resonance unit, being electrically connected between the second resonance unit and the output end, and electrically connected with the third resonance unit;a first filter unit, being electrically connected between the first resonance unit and the third resonance unit,a second filter unit, being electrically connected between the second resonance unit and the fourth resonance unit,wherein the first even-mode resonance module, the second even-mode resonance module, the first filter unit and the second filter unit be integrated in a main body, and the input end and the output end being extended out of the main body.

