Coplanar waveguide transmission line-based filter

Abstract

The invention discloses a coplanar waveguide transmission line-based filter. The filter consists of a dielectric substrate, a first metal grounding surface, a second metal grounding surface and a coplanar waveguide transmission line, wherein the first metal grounding surface is arranged on the first surface of the dielectric substrate; the second metal grounding surface is arranged on the second surface of the dielectric substrate; the coplanar waveguide transmission line is arranged on the first metal grounding surface; the coplanar waveguide transmission line is symmetric in the left-right direction; the coplanar waveguide transmission line comprises first to seventh transmission lines, which are sequentially connected end to end; both the first end of the first transmission line and thesecond end of the seventh transmission line are open circuits; the first to seventh transmission lines form a half-wavelength resonator; the coplanar waveguide transmission line furthermore comprisesan eighth transmission line and a ninth transmission line; the first end of the eighth transmission line is connected with a first connection point on the second transmission line; and the first endof the ninth transmission line is connected with a second connection point on the sixth transmission line. The filter provided by the invention has favorable low-pass filter characteristics and is small in area and low in cost.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a filter based on a coplanar waveguide transmission line. Background technique [0002] With the increasingly crowded spectrum resources, the wireless communication system is developing towards the direction of multi-band and microwave miniaturization, and the filter with frequency selection function is indispensable in the whole wireless communication system. Frequency and chip development. [0003] The traditional filter is composed of a series of lumped components (capacitors and inductors). When the filter is applied to high frequencies, the capacitor and inductance of the filter will have parasitic effects at high frequencies due to the shortening of the wavelength. Therefore, The filter composed of lumped components has certain limitations when applied to high frequencies, and the size of capacitors and inductors can no longer be ignored, resulting in a larger filter area....

AI Technical Summary

Problems solved by technology

[0003] The traditional filter is composed of a series of lumped components (capacitors and inductors). When the filter is applied to high frequencies, the capacitor and inductance of the filter will have parasitic effects at high frequencies due to the shortening of the wavelength. Therefore, The filter composed of lumped components has certain limitations when applied to high frequencies, and the size of capacitors and inductors can no longer be ignored, resulting in a larger filter area. In addition, the cost of lumped components higher

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