Multilayer substrate integration waveguide filter with high out-of-band rejection

Abstract

The present invention provides a multilayer substrate integration waveguide filter with high out-of-band rejection. The problems are solved that the size of the current substrate integration waveguide is large, the level of the out-of-band rejection is not high, and the loss is still large. The filter comprises in order from up to down comprises a first metal layer (1), a first dielectric layer (2), a second metal layer (3), a second dielectric layer (4) and a third metal layer (5) which are stacked. The materials of the first metal layer (1), the second metal layer (3) and the third metal layer (5) are copper or sliver or tin or the composite layer formed by two types of metal mentioned above, namely the substrate metal is plated with another metal layer, and the first dielectric layer (2) and the second dielectric layer (4) can be common high-frequency circuit substrate and also can be the substrate though LTCC sintering or a semiconductor substrate. The multilayer substrate integration waveguide filter with the high out-of-band rejection can be configured to allow a transmit-receive front end to filter interference signals, and is good in the out-of-band rejection, small in loss and small in size.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of microwave and millimeter wave passive devices, and particularly relates to a substrate integrated waveguide filter in a microwave and millimeter wave passive device. [0003] Background technique: [0004] The filter is one of the key components of the radio frequency transceiver front end, which is widely used in radar and communication systems. In recent years, with the continuous improvement of the miniaturization and high integration requirements of these systems, higher requirements have been put forward for the performance of the filter, such as insertion loss, out-of-band suppression, and size. Current filters are mainly composed of microstrips and cavities. Microstrip filters have high loss and low power capacity, while cavity filters have low loss, but are bulky and heavy. The substrate integrated waveguide is a structure between the microstrip and the cavity, which combines the advantages of t...

AI Technical Summary

Problems solved by technology

However, the ordinary single-layer single-mode substrate integrated waveguide filter has a large size, the level of out-of-band suppression is not high, and the loss is still large.

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