KR101751446B1 - Dual-wideband bandstop filter using a stub enclosed stepped-impedance resonator - Google Patents

Abstract

A dual-band band-stop filter according to an aspect of the present invention includes: a first encoupling stub stepped impedance resonator formed on a microstrip transmission line; And a second encoupling stub stepped impedance resonator (120) formed on the microstrip transmission line and formed to have a line symmetry with a second gap distance from the first encoupling stub stepped impedance resonator, The first encroaching stub stepped impedance resonator includes a first vertical line stub formed in the microstrip transmission line with a first length in the vertical direction and a second vertical line stub extending from the end of the first vertical line stub to the microstrip transmission line, A first helical stepped impedance resonance pattern including a first helical stub bent from a first horizontal line stub formed in a second length in a direction of the first helical stub; And an enclosing stub surrounding the first helical stub of the first helical stepped impedance resonance pattern with a rectangular loop with a first gap interval; And is formed to include a plurality of protrusions.

Description

[0001] The present invention relates to a dual-band band-stop filter using a stub-stepped impedance resonator,

The present invention relates to a dual wideband bandstop filter using an encrossing stub stepped impedance resonator.

Modern microwave wireless communication systems use band-stop filters in both the transmitter and receiver sections for effective suppression of spurious signals.

Dual-band bandstop filters are commonly embedded in high-power amplifiers and mixers to reduce the size and cost of the system and suppress undesired sideband signals.

Because the resonators of the dual-band band-stop filter resonate in the stop band, they also require low insertion loss and low group delay characteristics in the passband.

Various techniques have been continuously studied to improve the characteristics of a dual-band band-stop filter.

As a method of reducing the size of a multi-band blocking filter, Korean Patent Registration No. 10-0893119 (a very small band blocking filter using a spiral resonator) includes a spiral type resonator formed by etching a spiral pattern in a transmission line to form a plurality of spiral patterns The band stop filter used is published.

As the wireless communication pattern becomes complicated, there is a demand for a band stop filter technique which is further downsized, has various transmission zero points and improved rejection level characteristics.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Publication No. 10-0893119 (ultra-small band-stop filter using a helical resonator).

Korean Patent Registration No. 10-0893119 (Ultra-Small Band Jersey Filter Using Spiral Resonator)

The present invention provides a dual broadband bandstop filter using an encasing stub stepped impedance resonator having two stopband characteristics and two transmission zeroes for each stopband and having improved rejection level characteristics.

The object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

A dual-band band-stop filter according to an aspect of the present invention includes: a first encoupling stub stepped impedance resonator formed on a microstrip transmission line; And a second encoupling stub stepped impedance resonator (120) formed on the microstrip transmission line and formed to have a line symmetry with a second gap distance from the first encoupling stub stepped impedance resonator, The first enveloping stub stepped impedance resonator comprises a first vertical line stub ( ₁₁ ) formed in the microstrip transmission line with a first length in the vertical direction, and a second vertical line stub ( ₁₁ ) extending from the end of the first vertical line stub A first helical stepped impedance resonance pattern including a first helical stub formed by spiraling from a first horizontal line stub formed in a horizontal direction and a first horizontal line stub to a transmission line; And an enclosing stub surrounding the first helical stub of the first helical stepped impedance resonance pattern with a rectangular loop with a first gap interval; And is formed to include a plurality of protrusions.

Further, the first helical stub is bent four times to form a spiral shape.

The dual band-stop filter has two stop bands and two transmission zeroes are formed for each stop band.

In addition, when the size of the second gap interval is made smaller, the position interval at which the two transmission zeroes occur is increased.

The dual band band-stop filter has two center frequencies, and the high-impedance section of the first helical-stepped impedance resonator and the electrical length of the enclosing stub are proportionally changed, And performs proportional tuning control.

The dual broadband band-stop filter has two center frequencies, and the second center frequency of the two center frequencies is tuned by changing only the electrical length of the enclosing stub.

The horizontal stub of the first vertical line stub is 1.9 (± 5%) mm, the horizontal line stub is 4.1 (± 5%) mm, the horizontal length of the enrobing stub is 5.1 (± 5% The interval is 0.2 (± 5%) mm, and the second gap interval is 0.9 (± 5%) mm.

In addition, the dual wideband band-stop filter has two center frequencies, and the two center frequencies are 4.70 (± 0.05) and 6.64 (± 0.05) GHs, respectively.

The dual-band band-stop filter may have a size of 17 (± 0.85) mm × 3.2 (± 0.16) mm.

In addition, the dual-band band-stop filter has a rejection level of 35.1 to 40.02 and 26.23 to 28.68 dB at two center frequencies, respectively.

The dual wideband bandstop filter using an encasing stub stepped impedance resonator according to an embodiment of the present invention has two stop bands and has two transmission break points (TZs) in each stop band.

Further, while maintaining the two in the center frequency of each of 35.1 ~ 40.02, rejection level of 26.23 ~ 28.68dB, 0.38 (± 0.019 ) λ g × 0.07 (± 0.0035) λ _g , it is possible to produce a smaller size while having a large rejection level as compared with the conventional band-stop filter of the same class.

The dual wideband bandstop filter using an encasing stub stepped impedance resonator according to an embodiment of the present invention is characterized in that it has a 4.7 (± 0.05) /6.64 (± 0.05) GHz dual band band having two transmission zeros in each stop band A stop filter is provided.

The dual broadband band-stop filter using the encroding stub stepped impedance resonator according to an embodiment of the present invention adopts a spiral stepped impedance resonator in the encroaching stub, so that the center frequency of the dual band band- And it is also possible to generate wide stop bands.

The dual wideband band-stop filter using the encroding stub stepped impedance resonator according to an embodiment of the present invention can be implemented effectively in the C-band applications by using 0.38 (± 0.019) λ _g × 0.07 (± 0.0035) λ _g . < / RTI >

In a dual wideband band-stop filter using an encroding stub stepped impedance resonator according to an embodiment of the present invention, the proportional tuning to two center frequencies for each stop band is performed by a first helical stepped impedance resonator By proportionally varying the electrical length of the enclosing stub surrounding the high-impedance section of the first helical stepped impedance resonator and the first helical stepped impedance resonator.

Also, in the dual broadband band-stop filter using the encroaching stub stepped impedance resonator according to an embodiment of the present invention, the second-order center frequency changes independently of the electrical length of the enclosing stub, .

Fig. 1 shows a basic structure of a conventional stepped impedance resonance pattern.
2 is a view for explaining a structure of an encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.
FIG. 3 illustrates a first helical stepped resonance pattern according to an embodiment of the present invention.
4 illustrates an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention.
FIG. 5 illustrates S ₂₁ -parameter responses for a first helical stepped resonance pattern and an encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.
FIG. 6 shows a current distribution of a current distribution with respect to a first center frequency of 4.65 GHz in an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention.
FIG. 7 illustrates a current distribution for a second center frequency of 6.6 GHz in an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention.
Fig. 8 shows a frequency change when? ₀ and? ₁ are changed proportionally.
9 shows a frequency change when? ₀ is increased in a state where? ₁ is fixed.
10 illustrates a structure of a dual wideband band-stop filter using an encoupling stub stepped impedance resonator manufactured according to an embodiment of the present invention.
FIG. 11 is a graph illustrating a change in position of a transmission zero according to a change in gap between two resonators in a dual wideband bandstop filter using an encroding stub stepped impedance resonator according to an embodiment of the present invention.
12 illustrates S-parameter response characteristics of a dual wideband band-stop filter using an encasing stub stepped impedance resonator according to an embodiment of the present invention.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, when a component is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise. Also, throughout the specification, the term "on" means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction.

Hereinafter, a dual wideband bandstop filter using an encroding stub stepped impedance resonator according to an embodiment of the present invention will be described in detail.

Fig. 1 shows a basic structure of a conventional stepped impedance resonance pattern.

Referring to FIG. 1, a typical stepped impedance resonance pattern 210 is configured such that a first section 210 and a following second section 220 are cascaded. The first section 210 is a high impedance Z ₁ section with an electrical length of? ₁ , and the second section 12 following it is comprised of a low impedance Z ₂ section with an electrical length of? ₂ .

A conventional general stepped impedance resonance pattern 200 is formed by using the width and the length of physical lines corresponding to the first and second sections 210 and 220 corresponding to the electrical lengths θ ₁ and θ ₂ , A stepped impedance resonator structure can be formed.

Thus, as shown in FIG. 1, a non-uniform impedance technique pattern in a stepped impedance resonator pattern has been used to obtain a dual band band-stop filter.

A major limitation in this patterned structure is that the magnitude variation of the impedance sections is both ultimate and uncontrollable, affecting both center frequencies.

2 is a view for explaining a structure of an encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.

As a result of studying various types of resonance patterns, the inventors of the present application have found that when forming an encroaching stub pattern surrounding an outer periphery of a stepped impedance resonance pattern as shown in FIG. 2 (b) Thereby making it possible to achieve two fairly close center frequencies and to enable tuning by suitably varying the electrical length.

Accordingly, the encroding stub stepped impedance resonance pattern 10 according to an embodiment of the present invention is used to set the first center frequency f _f in accordance with the design requirements of the band-stop filters, And the enveloping stub pattern may be designed to have an appropriate length to match the second center frequency fs.

The encroding stub stepped impedance resonance pattern 10 according to an embodiment of the present invention can selectively apply a range of frequency selection in the design of band stop filters.

The encroding stub stepped impedance resonance pattern 10 according to an embodiment of the present invention may be used to obtain the input impedance Z _in of the first order filter in accordance with an embodiment of the present invention, The sections are divided into sections:

The first section 11 is composed of a stub having a second characteristic impedance Z ₂ and a _second electrical length? _2a .

The second section 12 is comprised of parallel stubs 15 comprising a stepped impedance resonance pattern portion having a second characteristic impedance Z ₂ and a _second electrical length _2b , ₂ ) and a _second electrical length ( _2c );

Referring to FIG. 2 (b), the enclosing stub 15 is formed into a quadrangular closed circuit structure including the second section 12 as one side.

The third section 13 has a first characteristic impedance Z ₁ and a first electrical length θ ₁ as shown in FIG. 2 (c), and has a high impedance section of a conventional stepped impedance resonance pattern .

This structure can be used to evaluate the overall input impedance by cascading the ABCD matrices of the first section 11 and the second section 12 and connecting them to the high impedance section, have.

The ABCD matrix of the first section is deduced as shown in Equation 1 below.

(Equation 1)

In addition, the admittance matrix (Y _b) of the second section in the (c) 2 is obtained as the following expression (2).

(Equation 2)

After cascading the first section and the second section, the ABCD parameters obtained are given by Equation 3 below.

(Equation 3)

The total input impedance Z _in of the encroding stub stepped impedance resonance pattern 10 according to an embodiment of the present invention can be expressed by Equation 4 below.

(Equation 4)

In the resonance condition, Z _in = 0 and can be expressed by the following Equation 5.

(Equation 5)

Where Rz represents the impedance ratio of the low impedance section to the high impedance section in the encroaching stub stepped impedance resonance pattern 10 according to one embodiment of the present invention.

Further, the resonance conditions can be matched with the characteristics of? _F and? _S , which are the dual-band resonance frequencies defined by the input impedance Z _in , as given by Equation 6 below. .

(Equation 6)

Based on the above-described analysis, a dual-band band-stop filter using an encrouged stub stepped impedance resonator can be designed in the following steps (i) and (ii).

(i) Form a first helical stepped impedance resonance pattern to obtain a first center frequency (4.6 GHz).

FIG. 3 illustrates a first helical stepped resonance pattern according to an embodiment of the present invention.

In the first helical stepped resonance pattern shown in Fig. 3, the surrounding effect due to the electrical length &thetas; _2c of the encroding stub can be neglected.

(Equation 7)

The first screw in the step-shaped resonator pattern in Fig. _{3, Z1 = 131.1Ω, θ 1} = 100.65 °, Z 2 = 112.83Ω and _{θ 2 = θ 2a ± θ 2b} = represents a 14.71 °.

The material numerical values of the stepped impedance resonance pattern in Fig. 3 are l ₁ = 1.9 mm, l ₂ = 4.1 mm, w ₁ = 0.3 mm, and w ₂ = g ₁ = 0.2 mm.

(ii) In the second step, the encroaching stub 35 with Z ₂ = 112.83? and? _2c = 95.23 is added to the first helical stepped impedance resonance pattern of FIG. 3 as shown in FIG. 4 .

That is, in order to obtain the second center frequency at 6.6 GHz, the encroaching stub 35 is applied to the first helical stepped impedance resonance pattern 20 of FIG. To form an ingrowing stub stepped impedance resonance pattern.

4 illustrates an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention.

4, the physical size of the encasing stub stepped impedance resonance pattern according to an embodiment of the present invention is L ₁ = 3.2 mm, L ₂ = 5.1 mm, W ₁ = 0.3 mm, W ₂ = G ₁ = 0.2 mm.

The physical length of the first helical stepped impedance resonance pattern 20 is 0.04 and 0.29 times of the guided wavelength λ _g and is expressed by Z ₂ having the total electrical length θ _2a + θ _2b and the total electrical length θ for Z ₁ with _1), λ _g is evaluated in the simulation of the 4.6 GHz first center frequency.

Further, the physical length of the encroaching stub 35 having the second electrical length _2c is formed to be 0.28? G.

FIG. 5 illustrates S ₂₁ -parameter responses for a first helical stepped resonance pattern and an encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.

Referring to FIG. 5, the red color graph represents the S ₂₁ parameter response to the first helical stepped resonance pattern according to an embodiment of the present invention, and the black color graph represents the enveloping stub Lt; RTI ID = 0.0 > S21 _{< /} RTI > parameter response to a stepped impedance resonance pattern

Referring to Fig. 5, in the encroving stub stepped impedance resonance pattern, the effect of adding the encrouging stub to f _f is small, but f s is highly influenced by the encrouging stub so that f _f To 4.45 GHz.

Table 1 shows characteristics of a first helical stepped resonance pattern and an encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.

Parameters The first helical step type resonance pattern Enclosing Stub Stepped Impedance Resonance Pattern Center frequencies (ff, fs) (GHz) 4.6, 11.05 4.65, 6.6 3 dB fractional bandwidth (FBW) (%) 19.66, 9.5 27.21, 23.52 Return loss (dB) 0.07, 0.13 0.05, 0.05 Rejection level of 30 dB 29.43, 29.6 30.24, 32.35

5 and Table 1, in the enclosing stub stepped impedance resonance pattern according to the embodiment of the present invention, two center frequencies are added to the first helical stepped resonance pattern in addition to the encroaching stub It was achieved very close by.

In addition, the characteristics of the bandwidth, return loss and rejection level of both stop bands have been improved by employing the encroaching stub.

The lowpass characteristic of the stop band frequency mapping given by L _i = (1 / ω _i g ₁ Δi) and C _i = (g ₁ Δ _i / ω _i ) is the dual-band resonance frequency ω _f And? _S And can be applied to obtain LC element values from the associated non-bandwidth of Table 1.

The LC element values of the first helical stepped resonance pattern calculated using this are L _f = 4.4 nH, C _f = 0.30 pF, L _s = 3.79 nH, and C _s = 0.04 pF, and the encrouged stub stepped resonance The LC element values of the pattern are L _f = 3.15 nH, C _f = 0.34 pF, L _s = 2.57 nH and C _s = 0.24 pF.

The obtained LC values indicate their importance in the feature of the enclosing stub added in the encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.

From the first helical stepped resonance pattern, the encroaching stub stepped impedance resonance pattern according to an embodiment of the present invention shows that the reduction of the inductance at both resonance conditions at approximately the same rate is due to the fact that the enclosing stub is the first And has a principal inductance effect acting in parallel to the inductance imposed by the helical stepped resonance pattern.

As a result, the bandwidth of both stop bands increases. Conversely, from the first helical stepped resonance pattern, the encroding stub stepped impedance resonance pattern according to an embodiment of the present invention shows an increase in capacitance under a second resonance condition (whose value is almost constant in the first resonance condition Shows that the capacitive effect of the encroding stub acts in parallel with the capacitance imposed by the first helical stepped resonance pattern such that the second center frequency is shifted from 11.05 to 6.6 GHz.

FIGS. 6 and 7 illustrate current distributions with respect to two center frequencies in an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention.

FIG. 6 is a graph illustrating a current distribution with respect to a first center frequency of 4.65 GHz in an encasing stub stepped impedance resonance pattern according to an embodiment of the present invention.

7 is a graph showing a current distribution with respect to a second center frequency of 6.6 GHz in an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention

Referring to Figures 6 and 7, it can be shown that there is a shift effect at the second center frequency from the current density profile at two center frequencies.

Referring to FIG. 6, at a first center frequency of 4.65 GHz, almost all current is concentrated in the encroaching stub. The en crowding stub acts as a virtual ground circuit as shown in Fig.

On the other hand, referring to FIG. 7, at the second center frequency of 6.6 GHz, the enroding stub contributes to the field distribution such that a portion of the current flows through the encroaching stub.

As a result, the second center frequency is shifted toward the first center frequency due to the capacitive effect.

FIGS. 8 and 9 illustrate tuning characteristics of an electrical length of an encroding stub stepped impedance resonance pattern according to an embodiment of the present invention.

From FIGS. 8 and 9, it is possible to know the pattern of two center frequencies with respect to the variable electrical length ratio (? ₀ /? ₁ ) (here? ₀ = (? _2b +? _2c ) / 2).

Fig. 8 shows a frequency change when? ₀ and? ₁ are changed proportionally.

9 shows a frequency change when? ₀ is increased in a state where? ₁ is fixed.

Referring to FIG. 8, when the amounts 0 ₀ and? ₁ are changed proportionally, f _f is 4.5 to 6.3 GHz, and f _s is 6.45 to 8.45 GHz, .

However, for electrical length ratios less than 1, f _f shows a decrease in both center frequencies from 4.4 to 3.8 GHz and f _s from 6.35 to 5.75 GHz.

In each case, there is an almost constant frequency gap of approximately 2 GHz between the two center frequencies.

Referring to FIG. 9, when θ ₁ is increased to 0.29 λ _g , θ ₀ increases, resulting in a decrease in center frequencies.

Referring to FIG. 9, f _f slightly shifts from 4.65 to 4.35 GHz. However, as it can further influence the f _s, as shown crow bar yen ranging stub than in Fig. 9 f _f f _s is analyzed by more meaningful shift in the 6.6 to 5.45 GHz.

10 illustrates a structure of a dual wideband band-stop filter using an encoupling stub stepped impedance resonator manufactured according to an embodiment of the present invention.

10, a broadband stop band filter 100 using an encasing stub stepped impedance resonator according to an embodiment of the present invention includes a microstrip transmission line 101 having a first length l ₁ formed by the first vertical line stub (l _1), the microstrip transmission line 101 and a second length in the horizontal direction (l ₂₎ from the end of the;) a first vertical line stub (l ₁₎ is formed of a A first helical stub 111 bent from the first horizontal line stub and formed in a spiral shape; A first helical stepped impedance resonance pattern including a first helical stepped impedance resonance pattern; And an enclosing stub 105 enclosing the outside of the first helical stub of the first helical stepped impedance resonance pattern with a first gap interval G ₁ and a rectangular loop; A first encoupling stub stepped impedance resonator (110) formed to include a first stub stepped impedance resonator; Wow

A second encoupling stub stepped impedance resonator 120 formed on the microstrip transmission line 101 and formed to have a line symmetry with a gap of a second gap G2 from the first encoupling stub stepped impedance resonator 120 ).

The first spiral stub 101 included in the wide band stop band filter 100 using the encroding stub stepped impedance resonator according to an embodiment of the present invention includes the first horizontal stub line l ₂ And is formed into a spiral shape.

The external size dimensions of the first encroaching stub stepped impedance resonator 110 according to an embodiment of the present invention are the same as the corresponding resonant patterns of Figs.

10, the dimensions of the dual wideband band-stop filter 100 using an encasing stub stepped impedance resonator according to an embodiment of the present invention are l ₁ = 1.9 mm, l ₂ = 4.1 mm, L ₁ = 3.2 mm, L ₂ = 5.1 mm, w ₁ = 0.3 mm, w ₂ = G ₁ = 0.2 mm, and G ₂ = 0.9 mm.

According to one embodiment of the present invention, each dimension may have a manufacturing error of about 5%.

FIG. 11 is a graph illustrating a change in position of a transmission zero according to a change in gap between two resonators in a dual wideband bandstop filter using an encroding stub stepped impedance resonator according to an embodiment of the present invention.

Referring to FIG. 11, when the value of G ₂ , which is the gap between two resonators, is selected as the minimum gap, two transmission poles are generated at positions close to each other in the pass band between two stop bands during the simulation.

Referring to FIG. 11, if the value of G2 is made small, the position interval where two transmission zeroes are generated becomes large. If the value of G2 is large, the position interval where two transmission zeroes occur is small.

This feature is such that the coupling effect between two identical resonator structures becomes more pronounced at smaller values of G ₂ and generates an additional transmission zero in the stop band region.

In addition, the bandwidth of the first stop band remains constant, while it decreases slightly in the case of the second stop band.

The dual wideband bandstop filter 100 using the encasing stub stepped impedance resonator according to an embodiment of the present invention has a dielectric constant? _R of 2.52, a thickness h of 0.504 mm, a loss tangent of 0.002, And is fabricated on the substrate 161.

12 illustrates S-parameter response characteristics of a dual wideband band-stop filter 100 using an encasing stub stepped impedance resonator according to an embodiment of the present invention.

Parameters
Property value Center frequencies (ff, fs)
4.70 (± 0.05), 6.64 (± 0.05) [GHs] 3 dB fractional bandwidth (FBW)
31.02 (± 1.50), 23.93 (± 1.50) [%] Return loss
0.05 to 0.75, 0.05 to 0.81 [dB] Rejection level of 30 dB
35.1 (± 5.00), 28.68 (± 5.00) [dB]

Table 2 shows the characteristic values of the dual wide bandstop filter 100 using the encroding stub stepped impedance resonator according to an embodiment of the present invention.

12 and Table 2, the center frequencies of the dual wideband band-stop filter 100 using the encroaching stub stepped impedance resonator according to an embodiment of the present invention are 0.05 to 0.75 and 0.05 to 0.81 dB (± 0.05) GHz and 6.64 (± 0.05) GHz, respectively, with loss.

Each non-bandwidth is shown to be 31.02 (± 1.50) and 23,93 (± 1.50) GHz at 3 dB insertion loss.

Referring to FIG. 12, there is a pass band between the two wideband stop bands, where the insertion loss is 1.04 dB at a center frequency of 5.5 GHz, the return loss is 32.42 dB, and the frequency band extends from 5.23 GHz to 5.86 GHz.

Also, two out-of-band rejections are observed on the left and right sides of the first and second stop bands with return losses of 29.63 and 26.7 dB at 3.33 and 7.65 GHz, respectively.

The total size of the dual wideband bandstop filter 100 using the encroaching stub stepped impedance resonator according to an embodiment of the present invention corresponds to 0.38 (± 0.019) λ _g × 0.07 (± 0.0035) λ _g , 17 (± 0.85) mm × 3.2 (± 0.16) mm.

The dual wideband bandstop filter 100 using the encroding stub stepped impedance resonator according to an embodiment of the present invention has two transmission end points TZs (tZs) in each stop band as compared with the conventional bandstop filter having one transmission zero point, ).

Also, it has a small size of 0.38 (± 0.019) λ _g × 0.07 (± 0.0035) λ _g while having reject levels of 35.1 to 40.02 and 26.23 to 28.68 dB at two center frequencies, respectively.

That is, the filter has a larger rejection level and a smaller size than the conventional band-stop filter of the same class.

The dual wideband bandstop filter 100 using the encroaching stub stepped impedance resonator according to an embodiment of the present invention has a band gap of 4.7 (± 0.05) /6.64 (± 0.05) GHz with two transmission zeros in each stop band A dual-band band-stop filter is provided.

The dual wideband bandstop filter 100 using the encroding stub stepped impedance resonator according to an embodiment of the present invention adopts a spiral stepped impedance resonator in the encroaching stub, It is possible to obtain the center frequencies of the center frequency bands and to generate wide stop bands.

Crow yen ranging stub stepped impedance resonator dual broadband band-stop filter 100 using, in accordance with an embodiment of the present invention, a small amount of 0.38λ _g × 0.07λ _g that can be efficiently implemented in the C- band application .

In the dual wideband bandstop filter 100 using the encroaching stub stepped impedance resonator according to an embodiment of the present invention, the proportional tuning to two center frequencies for each stop band is performed by a first helical step Type impedance resonator and the electrical length of the enclosing stub that surrounds the first helical stepped impedance resonator can be achieved by proportionally varying the electrical length of the enclosing stub surrounding the first helical stepped impedance resonator.

In the dual broadband band-stop filter 100 using the encroding stub stepped impedance resonator according to an embodiment of the present invention, the second-order center frequency is changed by changing only the electrical length of the enclosing stub, / RTI >

10: Enclosing stub Stepped impedance Resonance pattern
15, 35, 105: Enclosing stub
20: 1st helical stepped impedance resonance pattern
100: Enclosure stub stepped impedance bandpass filter using wideband
101: Microstrip transmission line
111: 1st helical stub
110: 1st Enclosure Stub Stepped Impedance Resonator
120: Part 2 Crowing Stub Stepped Impedance Resonator
161: substrate

Claims (10)

In a dual broadband band-stop filter,
The dual-band band-stop filter comprises:
A first encoupling stub stepped impedance resonator formed on the microstrip transmission line; And a second encoupling stub stepped impedance resonator formed on the microstrip transmission line and formed to have a line symmetry with a second gap interval between the first encoupling stub stepped impedance resonator and the second encoupling stub stepped impedance resonator,
The first enveloping stub stepped impedance resonator may include:
A first vertical line stub formed in the microstrip transmission line with a first length in the vertical direction and a first horizontal line stub formed in a second length in the horizontal direction from the end of the first vertical line stub, A first helical stepped impedance resonance pattern including a first helical stub formed in a spiral shape; And
An enclosing stub surrounding the first spiral stub of the first spiral stepped impedance resonance pattern with a square loop having a first gap interval; And a second wideband bandstop filter using an encod- ing stub stepped impedance resonator.
The method according to claim 1,
Wherein the first spiral stub is bent four times to form a spiral. A dual wideband band-stop filter using an encroding stub stepped impedance resonator
The method according to claim 1,
Wherein the dual wideband bandstop filter has two stop bands and two transmission zeros are formed for each stop band. The dual wideband bandstop filter using the encroaching stub stepped impedance resonator
The method of claim 3,
And the second gap distance is set to be smaller, a position interval at which the two transmission zeroes are generated becomes larger. [Claim 6] The dual band band-stop filter using an encording stub stepped impedance resonator
The method according to claim 1,
Wherein the dual broadband band-stop filter has two center frequencies,
And the proportional tuning control is performed on the two center frequencies by proportionally changing the high impedance section of the first helical stepped impedance resonator and the electrical length of the encroaching stub. Dual Wideband Bandstop Filter Using Impedance Resonator
The method according to claim 1,
Wherein the dual broadband band-stop filter has two center frequencies,
And the second center frequency of the two center frequencies is tuned by changing only the electrical length of the enclosing stub. The dual broadband band-stop filter using the encod- ing stub stepped impedance resonator
The method of claim 1, wherein
Wherein the first vertical strip stub is 1.9 (+/- 5%) mm, the horizontal line stub is 4.1 (+/- 5%) mm, the horizontal length of the enrobing stub is 5.1 (+/- 5%) mm, And the second gap interval is 0.9 (+/- 5%) mm. A dual wideband bandstop filter using an encasing stub stepped impedance resonator,
The method according to claim 1,
Wherein the dual broadband band-stop filter has two center frequencies,
Wherein the two center frequencies are 4.70 (± 0.05) and 6.64 (± 0.05) GHs, respectively. The dual wideband bandstop filter using the encroaching stub stepped impedance resonator
The method according to claim 1,
Wherein the dual wideband bandstop filter is formed in a size of 17 (± 0.85) mm × 3.2 (± 0.16) mm. The dual wideband bandstop filter using the encroaching stub stepped impedance resonator
9. The method of claim 8,
Wherein the dual wideband bandstop filter has rejection levels of 35.1 to 40.02 and 26.23 to 28.68 dB at two center frequencies, respectively. The dual broadband bandstop filter using the encroaching stub stepped impedance resonator

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