Plane low-pass band-pass dual-frequency filter

Abstract

The invention discloses a plane low-pass band-pass dual-frequency filter which is manufactured on a dielectric substrate in a printed circuit board manner. An input end feeder line port 1 for inputting an electromagnetic wave signal, an output end feeder line port 2 for outputting an electromagnetic wave signal, a first transmission line (1), a second transmission line (2), a third transmission line (3), a fourth transmission line (4), a fifth transmission line (5), a six transmission line (6) and a seventh transmission line (7) are manufactured on the same surface of the dielectric substrate; an earth plate is arranged on the other surface of the dielectric substrate. On the premise that the low-pass characteristic is not changed, the band-pass center frequency can be adjusted in a large range; the filter comprises an open circuit transmission line and a high impedance line, enables the band-pass center frequency to be independently adjusted within a larger range by adjusting the electrical length and characteristic impedance of the transmission lines, and has the advantages of adjustable frequency, good selectivity, low loss and simple structure.

Description

technical field [0001] The invention relates to the technical field of planar microstrip filters, in particular to a planar low-pass band-pass dual-frequency filter. Background technique [0002] With the rapid development of wireless communication technology, whether it is the popularity of 3G technology, the popularity of the Internet of Things or the arrival of 4G, it marks that wireless technology will usher in a peak period of vigorous development. In recent years, radio frequency / microwave communication systems that can work in two frequency bands at the same time have become a research hotspot, and microwave dual-frequency filters, as the key components of these communication systems, have also attracted more and more attention. Traditional dual-frequency filters have a general passband It is fixed, and sometimes it cannot meet the needs of wireless communication application systems for high-performance microwave dual-band filters. Therefore, it is of great significan...

AI Technical Summary

Problems solved by technology

[0007] The design method of the above achievements is to combine two band-pass filters with different frequencies, but the size of this filter is large and requires an additional connection network, the structure is more complicated and the design cost of the filter is increased.

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