Multilayer filter

Abstract

Disclosed is a multi-layer filter, open circuit branch knots are introduced N resonance units can generate more than N-2 zero points, and the out-of-band rejection is good; the position of the zero point can be flexibly controlled by adjusting the (electric) length of the open-circuit branch knot, the longer the line length is, the weaker the low-end capacitive zero point is (far away from the passband), and the stronger the high-end inductive zero point is (close to the passband), or vice versa. Through the connecting wires between the three-dimensional spiral inductors, on one hand, strongcoupling is realized, and on the other hand, the process realization difficulty is reduced, and the finished product yield is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of filters, in particular to a multi-layer filter. Background technique [0002] Nowadays, whether it is military radar, electronic detection, electronic countermeasures, etc., or civilian mobile phone communication, TV, and remote control, it is necessary to distribute and process electronic signals, which requires the use of an important microwave passive device-filter. [0003] With the rapid development of modern communication technology, small size, light weight, high performance, low cost, and wide bandwidth have become an inevitable trend in the development of modern communication systems. As the core frequency selection device in the transceiver system, the filter is used in the communication system to extract or filter out signals of different frequencies. The size of the traditional filter structure is large, and N resonant units can realize at most N-2 out-of-band transmissi...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a multi-layer filter to solve the prob

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