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Ultra wide band coplanar waveguide filter adopting terminal short circuit H-type resonator

A technology of coplanar waveguide and terminal short circuit, applied in resonators, waveguide devices, circuits, etc., can solve the problems of not being able to realize the trap function, unable to satisfy people, complex structure, etc., to improve out-of-band characteristics, eliminate influence, Small size effect

Inactive Publication Date: 2015-07-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But above-mentioned two kinds of filter of prior art just adopt fixed structure, and its function is single, and structure is complicated, and cost is higher, and can't realize notch function, can't satisfy people's actual demand

Method used

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  • Ultra wide band coplanar waveguide filter adopting terminal short circuit H-type resonator
  • Ultra wide band coplanar waveguide filter adopting terminal short circuit H-type resonator
  • Ultra wide band coplanar waveguide filter adopting terminal short circuit H-type resonator

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Embodiment 1

[0032] Such as image 3 As shown, the ultra-broadband coplanar waveguide filter of this embodiment includes a coplanar waveguide structure 1 and an H-type microstrip line resonator 2, and the phase between the coplanar waveguide structure 1 and the H-type microstrip line resonator 2 is coupling, and the left and right sides of the coplanar waveguide structure 1 and the H-type microstrip line resonator 2 are symmetrical about the same central vertical line, and the left and right ends of the coplanar waveguide structure 1 are respectively connected with 2 root wedge transmission line 3.

[0033] Such as Figure 4 Shown is the equivalent circuit of the H-type microstrip line resonator, including a low-impedance transmission line in the middle and four identical high-impedance transmission lines on both sides. The high-impedance transmission lines on both sides can be regarded as a pair of parallel short-circuit stubs. A-A' is the symmetry plane of the structure, and the high ...

Embodiment 2

[0037] Such as Figure 9 As shown, the main features of the ultra-broadband coplanar waveguide filter of this embodiment are: the coplanar waveguide structure 1 is provided with 8 L-shaped groove lines 4, and the left and right sides are respectively provided with 4, and the left and right sides are respectively provided with 4. The L-shaped groove lines 4 on the right are symmetrical to each other. All the other are with embodiment 1.

[0038] The L-shaped slot line of the ultra-broadband coplanar waveguide filter of the present embodiment is equivalent to adding a low-pass filter, such as Figure 10 As shown, it can be seen that the high-frequency out-of-band characteristics of the filter after adding the L-shaped slot line are well improved compared with the filter without the addition.

Embodiment 3

[0040] Such as Figure 11 and Figure 12 As shown, the main features of the ultra-broadband coplanar waveguide filter of this embodiment are: the center of the coplanar waveguide structure 1 is provided with an E-shaped slot 5, and the H-type microstrip line resonator 2 is provided with an E-shaped slot 5. Groove 5 is compatible with E-shaped groove line 6. All the other are with embodiment 2.

[0041] The E-shaped slot line of the ultra-broadband coplanar waveguide filter of the present embodiment is to realize the notch function, as Figure 13 As shown, it can be seen that this structure can generate a notch with two transmission zeros, and its center frequency is 5.8GHz, which can well avoid the influence of the wireless LAN system on the ultra-wideband system.

[0042] Such as Figure 14 As shown, the ultra-broadband coplanar waveguide filter of the present invention has good in-band characteristics and good out-of-band suppression, and has a notch with a center freque...

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Abstract

The invention discloses an ultra wide band coplanar waveguide filter adopting a terminal short circuit H-type resonator. The ultra wide band coplanar waveguide filter comprises a coplanar waveguide structure and an H-type micro-strip line resonator, wherein the coplanar waveguide structure is coupled with the H-type micro-strip line resonator, the left and right ends of the coplanar waveguide structure are respectively connected with a wedged transmission line, multiple L-shaped slot lines are arranged on the coplanar waveguide structure, an E-shaped slot is arranged in the center of the coplanar waveguide structure, and the H-type micro-strip line resonator is connected with an E-shaped slot line adaptive to the E-shaped slot. The ultra wide band coplanar waveguide filter adopts two structures, namely the terminal short circuit H-type resonator and the coplanar waveguide, can realize strong coupling, additionally adopts the wedged transmission lines to improve the in-band feature and also additionally adopts the L-shaped slot lines to improve the out-band feature of a high frequency band, and further, a trapped wave can be generated in band, and the influence of a wireless local area network system on an ultra wide band system is eliminated.

Description

technical field [0001] The invention relates to an ultra-wideband coplanar waveguide filter, in particular to an ultra-wideband coplanar waveguide filter adopting an H-shaped resonator short-circuited at the terminal, belonging to the field of wireless communication. Background technique [0002] With the continuous development of wireless broadband communication systems, especially the development of ultra-wideband communication technology, the demand for ultra-wideband filters is increasing, and the performance of filters has also received extensive attention. In the past, most bandpass filters, including ultra-wideband filters, were generally realized with a microstrip line structure, but a bottleneck of the microstrip line filter is that the coupling between the coupled lines is not very strong, which is due to the The distance between the two cannot be too small, because if it is too small, the physical realization will be difficult, which leads to the unsatisfactory re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203H01P7/08
Inventor 汪凯王世伟陈瑞森郑丽昇褚庆昕
Owner SOUTH CHINA UNIV OF TECH