KR101728082B1 - UWB bandpass filter using stepped impedance short and open circuited stub - Google Patents

UWB bandpass filter using stepped impedance short and open circuited stub Download PDF

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KR101728082B1
KR101728082B1 KR1020150045625A KR20150045625A KR101728082B1 KR 101728082 B1 KR101728082 B1 KR 101728082B1 KR 1020150045625 A KR1020150045625 A KR 1020150045625A KR 20150045625 A KR20150045625 A KR 20150045625A KR 101728082 B1 KR101728082 B1 KR 101728082B1
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South Korea
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stub
line
transmission line
multijunction
open
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KR1020150045625A
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Korean (ko)
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KR20160117041A (en
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민병욱
정민재
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연세대학교 산학협력단
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling

Abstract

The present invention provides a UWB pass filter with a stub of a stepped impedance ground circuit and an open stub coupled with a triple mode resonator including the stub of the triple mode resonator. In the ultra wide band pass filter, A first and a second multijunction transmission line constituted by a transmission line and a multijunction line between the input side port and the output side port of the central transmission line; A first open stub having an open stub structure radially coupled to one side in the vertical direction of the center transmission line between the input side port and the first multijunction line, , A vertical direction of the central transmission line between the output side port and the second multijunction line And a second open stub having an open stub structure radially coupled to the first open stub.

Description

[0001] UWB bandpass filter using stepped impedance ground circuit stub and open stub [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a UWB pass filter, and more particularly, to a UWB pass filter having an open stub coupled with a triple mode resonator including the principle of a stepped impedance ground circuit stub.

The existing UWB pass filter has various design methods with the aim of low insertion loss, mainly with high selectivity and wide band stop band.

One of them, electromagnetic bandgap structure, has been used to have a very wide stop band, but the size of the circuit has been increased and it has been disadvantageous that it can not be used in the UWB band.

The other is the combination of a lowpass (bandpass) filter and a highpass (bandstop) filter, which is used in the UWB band, but has a disadvantage in that it has an excellent stop band but can not reduce its size.

In order to reduce the size and to obtain good performance, a hybrid microstip / coplanar waveguide structure or a low-temperature-co-fired ceramic (LTCC) or liquid crystal-polymer However, this method has disadvantages in that it is not easy to integrate with other systems when using such a process.

As a design method in a single layer, a method called a multiple-mode resonator has been widely used. In order to secure a strong coupling, a three-scheme coupled line and a step impedance step Respectively.

Patent Registration No. 10-1007543 (registered date Jan. 2011) Published Japanese Patent Application No. 10-2011-0071741 (published on June 29, 2011)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an ultra wide band (UWB) pass filter in which a stub of a stepped impedance ground circuit is combined with an open stub coupled with a triple mode resonator including the stub. There is a purpose.

Other objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an ultra-wide band pass filter using a stub of a stepped impedance grounding circuit and an open stub in which a central transmission line is formed in a horizontal direction, A first and a second multijunction transmission line composed of a multimode line between the input side port and the output side port and a stepped impedance ground circuit stub structure to one side of the central transmission line between the first multijunction line and the second multijunction line, A first open stub having an open stub structure radially coupled to one side in the vertical direction of the center transmission line between the input side port and the first multijunction line, Open stubs radially coupled to one side of the central transmission line in the vertical direction There is composed by including a second open stub having a tank.

In this case, the step grounding stub is capable of adjusting the position of the second transmission zero point based on the center frequency f o .

The first and second multijunction lines may be triple-coupled lines.

The first and second open stubs are characterized in that the rejection rate is reduced at high frequencies due to the step difference between two lines which acts as a loss of the microstrip line.

As described above, the UWB pass filter using the stub of the step-impedance grounding circuit and the open stub according to the present invention has the following effects.

First, the stepped-impedance grounding circuit of the present invention is capable of freely adjusting the transmission zero of the high-frequency side and suppressing the spurious response.

Second, by using this stub with an open stub combined with radial, the performance of the ultra-wideband pass filter can be maximized.

Third, the designed bandpass filter has a very high attenuation ratio in the high frequency passband, so it is useful for various ultra-wideband radio applications as a miniaturization filter with excellent selectivity and wide band stop band. There is an effect that can be.

1 is a diagram showing a structure of an ultra-wide bandpass filter using a stub of a stepped impedance ground circuit and an open stub according to an embodiment of the present invention.
Fig. 2 is a block diagram showing the configuration of the stepped stub of Fig. 1
Fig. 4 is a configuration diagram showing details of the configuration of the first and second open stubs of Fig. 1
5 is a graph comparing transmission zero characteristics of a conventional single ground stub and a step ground stub of the present invention
FIG. 6 is a graph showing a comparison of the degree of rejection at a high frequency between the conventional open step stub and the radially-coupled open stub of the present invention

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

A preferred embodiment of the UWB pass filter using the stepped impedance ground circuit stub and the open stub according to the present invention will now be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

1 is a block diagram showing the structure of an ultra-wide band pass filter using a stub of a stepped impedance grounding circuit and an open stub according to an embodiment of the present invention.

The first and second multijunction lines 40a and 40b are connected between the input side port 10 and the output side port 20 of the central transmission line as shown in Fig. . A step ground stub 30 is formed on one side in the vertical direction of the central transmission line between the first multijunction line 40a and the second multijunction line 40b and is connected to the input side port 10, And forms a first open stub 50a radially coupled to one side of the multimode line 40a in the vertical direction of the central transmission line. The second open stub 50b is radially connected to one side of the center transmission line between the output port 20 and the second multijunction line 40b in the vertical direction.

The stepped ground stub 30, as shown in FIG. 2, can be configured with a stepped impedance grounded circuit stub structure, so that compared to a uniform impedance grounded circuit stub having the same electrical length,

Figure 112015031712037-pat00001
Four electrical variables
Figure 112015031712037-pat00002
So that a variety of designs can be obtained. That is, the advantage of the performance is that the position of the second transmission zero can be adjusted based on the center frequency f o .

Here, Zs 1 represents an impedance of a first line, and Zs 2 represents an impedance of a second line. And

Figure 112015031712037-pat00003
s 1 represents the electrical length of the first line,
Figure 112015031712037-pat00004
and s 2 represents the electrical length of the second line.

One of the important factors for designing the ultra-wideband pass filter is the coupling strength of the coupled line to the first and second multimode lines 40a and 40b. The present invention is configured to have a triple-coupled line furnace so as to have a stronger coupling at a limited process limit than a double-coupled line.

In this case, Zoe represents the even mode impedance of the coupled line, and Zoo represents the odd mode impedance of the coupled line.

The first and second open stubs 50a and 50b may be formed by a radially coupled open stub structure as shown in FIG. 4, so that due to a step difference between two lines among various factors acting as a loss of the microstrip line So that the rejection ratio can be increased at high frequencies.

In this case, W 1 shown in FIG. 4 represents the width of the open stub, R o represents the radius of the radial stub,

Figure 112015031712037-pat00005
Represents the central angle of the radial stub.

5 is a graph comparing transmission zero characteristics of a conventional single ground stub and a step ground stub of the present invention. In this case, the center gray dotted line (R = 1) is a single ground stub, the gray line (R > 1) and the black line (R <1).

As shown in FIG. 5, it can be seen that the transmission zero of the ultra wide band pass filter constructed by the structure of the step ground stub of the present invention is superior to the case of the ultra wide band pass filter having the structure of the single ground stub.

FIG. 6 is a graph comparing the degree of rejection at a high frequency of the conventional open step stub and the radially-coupled open stub of the present invention.

As shown in FIG. 6, in the case of the ultra wide band pass filter having the structure of the radially coupled open type stub of the present invention, compared to the case of the ultra wide band pass filter having the structure of the conventional open step stub, the rejection ratio Is high.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (4)

In the ultra wide band pass filter,
First and second multiseconnection lines constituted by a central transmission line in the horizontal direction and a multijunction line between the input side port and the output side port of the central transmission line,
A stepped ground stub having a stepped impedance ground circuit stub structure on one side in a direction perpendicular to a center transmission line between the first multijunction line and the second multijunction line,
A first open stub having an open stub structure radially coupled to one side in the vertical direction of the center transmission line between the input side port and the first multijunction line,
And a second open stub having an open stub structure radially coupled to one side of the center transmission line between the output side port and the second multijunction transmission line in a direction perpendicular to the center transmission line. Ultra wide band pass filter using. The method according to claim 1,
Wherein the step ground stub is capable of adjusting the position of a second transmission zero point with reference to a center frequency (f o ) of the stepped ground stub. The method according to claim 1,
Wherein the first and second multimode lines are composed of a triple coupled line. The ultra wide band pass filter using the stamper of the stepped impedance ground circuit and the open stub. The method according to claim 1,
Wherein the first and second open stubs increase a rejection ratio that is reduced at high frequencies due to a step difference between two lines acting as a loss of the microstrip line. filter.
KR1020150045625A 2015-03-31 2015-03-31 UWB bandpass filter using stepped impedance short and open circuited stub KR101728082B1 (en)

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CN110890610B (en) * 2019-12-05 2021-02-05 电子科技大学 Double-passband filter based on quarter-wave resonator
CN113488752B (en) * 2021-07-16 2022-05-10 辽宁工程技术大学 Five-notch miniature ultra-wideband filter based on C-type resonator

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KR20110071741A (en) 2009-12-21 2011-06-29 한국전자통신연구원 Wide-band width band pass filter
KR101007543B1 (en) 2010-02-11 2011-01-14 주식회사 이너트론 Fabricating method for ultra-wideband rejection microstrip lowpass filter combined metameterial unit-cells

Non-Patent Citations (2)

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Title
Huan Yang외 4인, "A Triple-mode Passband Filter with Improved Upper-stopband Performance", Progress In Electromagnetics Research Symposium Proceedings, Stockholm, Sweden, 2013년 8월.
Li Hao외 5인 "Tri-band Bandpass Filter Using Short and Open Stub-Loaded Resonator", JOURNAL OF SHANGHAI UNIVERSITY (NATURAL SCIENCE), Vol. 20 No. 2, 2014년4월.

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