Stepped impedance resonator load-based stepped impedance ultra-wideband filter

An ultra-wideband filter and ladder impedance technology, applied in the design of multi-mode resonators and wireless communication equipment, can solve the problems of large size of ultra-wideband filter, poor out-of-band suppression, slow stop-band attenuation, etc. Effects of suppression, small size, enhanced selectivity

Inactive Publication Date: 2011-03-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing ultra-wideband filter based on the multi-mode resonator structure, such as large size, slow stopband attenuation, and poor out-of-band rejection, and provide a stepped impedance ultra-wideband filter loaded by a stepped impedance resonator

Method used

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  • Stepped impedance resonator load-based stepped impedance ultra-wideband filter
  • Stepped impedance resonator load-based stepped impedance ultra-wideband filter
  • Stepped impedance resonator load-based stepped impedance ultra-wideband filter

Examples

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Embodiment 1

[0027] Such as figure 1 As shown, a stepped impedance ultra-wideband filter loaded by a stepped impedance resonator includes: a front part, a microstrip substrate 11, a back part and input / output ports. There are two input / output ports, namely input / output port 1 and input / output port 10. The front part and the back part are respectively located on the two surfaces of the microstrip substrate 11, and the back part is used as the metal floor of the filter.

[0028] Such as figure 2 As shown, the front part includes: a first uniform transmission line unit 2, a second uniform transmission line unit 7, a first parallel coupled feeder 3, a second parallel coupled feeder 6, a stepped impedance resonator 4, and a loaded stepped impedance branch 5, The first parallel coupled feeder 3 and the second parallel coupled feeder 6 are parallel double-wire structures. The first uniform transmission line unit 2 and the second uniform transmission line unit 7 are respectively located at the ...

Embodiment 2

[0033] Such as Figure 5-Figure 7 As shown, the structures of this embodiment and embodiment 1 are basically the same, the only difference is that in embodiment 1, the loaded step impedance branch 5 is one section, while in embodiment 2 there are 5 and 15 loaded impedance branches. Festival. The two loaded ladder impedance branches 5 and 15 have the same structure, and 15 is also composed of two cascaded first microstrip lines 16 and second microstrip lines 17 with different impedances and electrical lengths.

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Abstract

The invention discloses a stepped impedance resonator load-based stepped impedance ultra-wideband filter. The filter consists of a micro band substrate 11, a front part, a rear part and an input/output port; the front part comprises a first uniform transmission line unit (2), a second uniform transmission line unit (7), a first parallel coupling feeder line (3), a second parallel coupling feeder line (6), a stepped impedance resonator (4) and a loaded stepped impedance branch knot, which are interconnected; the rear part comprises a first defective ground unit (8), a second defective ground unit (9) and a grounding metal unit (12); the first defective ground unit (8) is positioned below the first parallel coupling feeder line (3), and the second defective ground unit (9) is positioned below the second parallel coupling feeder line (6); and the second input/output port (10) is connected with the grounding metal unit (12). The filter has compact structure and more excellent inner band and outer band performance.

Description

technical field [0001] The invention belongs to the technology of wireless communication equipment, and relates to the design of a multi-mode resonator, in particular to the design of an ultra-wideband band-pass filter. Background technique [0002] After the U.S. Federal Communications Commission (FCC) freed and opened the 3.1-10.6GHz frequency band for applications in the communication field in 2002, UWB short-distance wireless communication has attracted great attention in the global communication technology field. As an indispensable and widely used passive device in communication systems, filters have become one of the hotspots of research. Because the ultra-wideband filter is required to work in a wide frequency range of 3.1-10.6GHz, and the filter is required to have a small size, the traditional filter design method cannot design such a wide-band filter. [0003] At present, the methods for realizing ultra-wideband filters include cascading low-pass and high-pass fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
Inventor 褚庆昕田旭坤
Owner SOUTH CHINA UNIV OF TECH
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