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A dual-band rejection filter using three-path signal interference

A signal interference, dual-band technology, applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problem that the stop band selectivity needs to be improved, multi-path signal interference, etc., to achieve design flexibility and miniaturization, high steepness, Effect of Return Loss Improvement

Inactive Publication Date: 2016-10-05
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

from Figure 10b According to the simulation test curve shown in , since there is only one transmission zero in the passband, its stopband selectivity needs to be improved
[0009] 3. Multipath signal interference
It can be seen that the passband selectivity is high, but the stopband suppression and out-of-band return loss can only reach 10dB

Method used

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  • A dual-band rejection filter using three-path signal interference
  • A dual-band rejection filter using three-path signal interference
  • A dual-band rejection filter using three-path signal interference

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with specific examples.

[0036] The dual-frequency band rejection filter using three-path signal interference of the present invention, on the basis of the traditional open-circuit stub single-frequency band rejection filter, couples two open-circuit stubs by folding and inlaid (or embedded) two folded and coupled Shorting the resonator, three paths are realized without increasing the size of the filter. The structure designed in the present invention can be a microstrip, a coaxial line or other structures. In this embodiment, a microstrip structure is selected, and the dual-band rejection filter includes a microstrip line structure on the upper layer, a dielectric substrate on the middle layer, a grounded metal patch on the lower layer, and metal vias connecting the upper and lower layers through the middle layer.

[0037] Such as figure 1 and figure 2 As shown, the dual-band rejection filter in...

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Abstract

The invention discloses a dual-frequency band-stop filter using three-path signal interference, which includes an input and output port, a first transmission main path, and a second transmission main path. The first transmission main path is composed of a transmission line, and its two ends are connected to The input and output ports are connected; the second transmission main path is composed of the first sub-path and the second sub-path in parallel, and the first sub-path is mainly formed by sequential cascading of the first transmission line, the first coupling line, and the second transmission line; the second The sub-path is mainly composed of the second coupled line, the third coupled line, and the fourth coupled line cascaded in sequence, and the third coupled line is short-circuited; the second coupled line and the fourth coupled line are folded and combined with the first coupled line and the fourth coupled line The three coupled lines are cascaded, the first transmission line overlaps the second coupled line, and the second transmission line overlaps the fourth coupled line. The invention makes the design more flexible, the transmission zero point in the stop band is independently controllable through different paths, and has steep roll-off characteristics and miniaturization.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a dual-frequency band rejection filter using three-path signal interference. Background technique [0002] The wide application of wireless communication systems has promoted the development of radio frequency microwave devices. As an important part of the communication system, the band-stop filter can suppress the spurious signals in a specific frequency band and eliminate signal interference, and its performance plays a key role in the performance of the entire communication system. On the other hand, in order to utilize the limited spectrum resources most efficiently, more and more wireless systems work in dual frequency bands. The dual-band rejection filter has the characteristics of double-band rejection, lower passband loss and group delay. Compared with the single-frequency rejection filter, the spectrum utilization rate of the communication system is grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
Inventor 褚庆昕邱雷雷
Owner SOUTH CHINA UNIV OF TECH
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