CN109244609B - A kind of square groove structure microwave filter with dual band operation characteristic - Google Patents
A kind of square groove structure microwave filter with dual band operation characteristic Download PDFInfo
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- CN109244609B CN109244609B CN201811057131.8A CN201811057131A CN109244609B CN 109244609 B CN109244609 B CN 109244609B CN 201811057131 A CN201811057131 A CN 201811057131A CN 109244609 B CN109244609 B CN 109244609B
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- square groove
- strip
- micro
- changeover portion
- metal micro
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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
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Abstract
The invention discloses a kind of square groove structure microwave filter with dual band operation characteristic.Including dielectric-slab, one surface of dielectric-slab is equipped with metal micro-strip, and another surface is equipped with metal；The structure of the metal micro-strip are as follows: the middle part of metal micro-strip is equipped with artificial surface phasmon section, and the both ends of artificial surface phasmon section are connect through changeover portion with micro-strip waveguide segment respectively；The square groove of hollow out, the square band connection through hollow out between adjacent two square groove is distributed in length direction in the artificial surface phasmon section and changeover portion along metal micro-strip；The upper and lower edge of square groove in changeover portion is along changeover portion to the convergent curve of micro-strip waveguide segment direction gradual change.The characteristics of low transmission of the present invention is lost, reflection characteristic is small, Out-of-band rejection performance is excellent, and anti-electromagnetic interference capability is strong, is adapted to high-frequency integrated circuit.
Description
Technical field
The present invention relates to wave filter technology field, especially a kind of square groove structure microwave filter with dual band operation characteristic
Wave device.
Background technique
Current big data era, as the demand of information is at explosive growth, field of mobile communication requires to manufacture
The higher microwave device of integrated level out technically occurs a series of however as the continuous diminution of high-frequency integrated circuit size
Problem, such as certain degree is arrived when the size of microwave device is small, the electromagnetic interference noise of device, RC retardation ratio etc., which reaches capacity, to be led
Device job insecurity is caused, therefore existing microwave device has not adapted to the development of current extensive microwave integrated circuit.
Summary of the invention
The object of the present invention is to provide a kind of square groove structure microwave filter with dual band operation characteristic.This hair
Bright low transmission is lost, reflection characteristic is small, Out-of-band rejection superior performance, and anti-electromagnetic interference capability is strong, is adapted to high-frequency integrated circuit
The characteristics of.Two different eigen modes that the present invention can also be formed using periodical square groove, so that filter works in two kinds
Different frequency ranges realizes a function multipotency of filter.
Technical solution of the present invention: a kind of square groove structure microwave filter with dual band operation characteristic, including medium
Plate, one surface of dielectric-slab are equipped with metal micro-strip, and another surface is equipped with metal；The structure of the metal micro-strip are as follows: metal is micro-
The middle part of band is equipped with artificial surface phasmon section, and the both ends of artificial surface phasmon section are respectively through changeover portion and micro-strip waveguide
Section connection；The side of hollow out is distributed in length direction in the artificial surface phasmon section and changeover portion along metal micro-strip
Slot, the square band connection through hollow out between adjacent two square groove；The upper and lower edge of square groove in changeover portion is along changeover portion to micro-strip
The convergent curve of waveguide segment direction gradual change.
In square groove structure microwave filter above-mentioned with dual band operation characteristic, the curve is to meet equation X
=L1+L2*t3, the curve of Y=h* (exp (b*t-1)/(expb-1))；Wherein t is independent variable parameter, and b is curve shape coefficient,
H is metal micro-strip width；L1For micro-strip waveguide segment length, L2For transition section length.
In square groove structure microwave filter above-mentioned with dual band operation characteristic, the h=2~8mm, L1=5
~15mm, L2=10~60mm, t=0~1, b=6.5~80.
In square groove structure microwave filter above-mentioned with dual band operation characteristic, the thickness g=of the dielectric-slab
0.3~1.2mm, side length a=0.5~5.0mm of square groove, wide β=0.5~3mm of square band, period p=1~8mm of square groove.
Compared with prior art, the present invention has the advantage that
1. metal micro-strip is arranged on a surface of dielectric-slab in the present invention, metal is arranged, metal micro-strip is divided on another surface
Three sections are artificial surface phasmon section respectively (below with its length symbol L3Substitution), changeover portion is (below with its length symbol
L2Substitution) and micro-strip waveguide segment (below with its length symbol L1Substitution)；Wherein L3Both ends respectively through L2With L1Connection；In L3With
L2Square groove upper, that hollow out is distributed with along the length direction of metal micro-strip, is in L2On the upper and lower edge of square groove be along L2To
L1The convergent curve of direction gradual change；In above structure, because being in L2On the upper and lower edge of square groove be along L2To L1Direction is gradually
Become convergent curve, realizes electromagnetic field in L1And L3The smooth transition of middle propagation avoids electromagnetic field and is converted by Quasi-TEM mode
For the strong microwave electric field reflection occurred when SSPPs mode propagation by mode and impedance mismatch.
For L of the present invention2The upper and lower edge of square groove curve, applicant obtains by many experiments, in filter of the invention
In wave device structure, work as L2The curve at upper and lower edge of square groove meet equation X=L1+L2*t3, Y=h* (exp (b*t-1)/
(expb-1)) when, the transition that electromagnetic field is propagated is most steady；Further, applicant is in the amendment for constantly carrying out experiment parameter
Shi Faxian, the present invention realize that the optimal parameter of smooth transition when electromagnetic field is propagated is as follows: t=0~1, b=6.5~80, h=2~
8mm, L1=5~15mm, L2=10~60mm.
2. the present invention is in L3The square groove of upper setting hollow out, the square band connection through hollow out between square groove.The structure is used this
In the microwave device of invention, since the square groove being periodically arranged has a variety of intrinsic operating modes, it can be swashed using waveguide port
The different even die worker's operation mode of two of them is encouraged out, then filter of the invention can be in two different microwave frequency band works
Make, realizes the ability of filter multiple types work.In addition, the structure can allow electromagnetic field to be bound in when interface is transmitted
Around square groove, the electromagnetic interference occurred when plurality of transmission lines transmission because spacing is too small is thus greatly reduced, so that of the invention
Anti-interference ability greatly enhances, while also enhancing stability of the present invention for working in high density microwave integrated circuit when.
Moreover, because anti-electromagnetic interference capability greatly enhances, between the present invention can also reduce between the metal micro-strip of microwave integrated circuit
Away from the miniaturization to realize device, thus the development of current extensive microwave integrated circuit can be better adapted to.The present invention can also
Regulate and control the cutoff frequency and magnetic distribution of microwave transmission line by adjusting the geometric dimension of square groove, while adjusting electromagnetic wave
Fetter effect.Applicant has found after carrying out a large amount of parameters revision experiment, in microwave device structure of the invention, when square groove
Side length a=0.5~5.0mm, wide β=0.5~3mm of square band, when square groove period p is 1~8mm, constraint of the square groove to electromagnetic field
Effect is best.
To sum up, low transmission of the present invention is lost, reflection characteristic is small, Out-of-band rejection superior performance, and anti-electromagnetic interference capability is strong, fits
It should be in the high-frequency integrated circuit the characteristics of.Two different eigen modes that the present invention can also be formed using periodical square groove, so that
Filter works in two different frequency ranges, realizes a function multipotency of filter.
In order to preferably prove beneficial effects of the present invention, application has carried out following experiment: applicant, which designs one, to be had
The square groove structure microwave filter sample of dual band operation characteristic, Facad structure such as Fig. 1, the parameter of sample such as table 1.
Table 1 has square groove structure microwave filter sample each section parameter (unit: mm) of dual band operation characteristic
The dielectric-slab of the sample use dielectric constant for 6.15 substrate, calculating to the sample unit structure eigen mode
As a result as shown in Figure 4.The first two idol mould eigen mode is listed, wherein 1 frequency range of mode is 0~10.56GHz, 2 frequency band of mode
Range is 14.36~17.05GHz, and is Quantum optics eigen mode.Filter (as shown in Figure 1) characteristic being made of cellular construction
Curve is through time-domain finite integral calculation as shown in figure 3, S in Fig. 311For filter reflection coefficients, S21For filter transfer coefficient,
The sample is double-passband filter, and the first frequency range is lower passband, and-three dB bandwidth is 0~10.31GHz, and sample is in the passband
Insertion Loss very little is greater than -0.9dB, and ripple shake is better than 0.45dB, and passband internal reflection is less than -12.2dB, and Out-of-band rejection characteristic is excellent,
Its squareness factor (the ratio between three dB bandwidth and 40dB bandwidth) can reach 0.96.Second frequency range is band passband, and-three dB bandwidth is
14.73~18.69GHz, sample minimum Insertion Loss in the passband are less than -0.91dB, and ripple, which is shaken, is better than 2.5dB, anti-in passband
It penetrates and is less than -10.8dB.By Fig. 3, Fig. 4 it is found that the double work frequency band of filter corresponds respectively to eigen mode 1 and eigen mode 2, wherein
Eigen mode 2 has Quantum optics.It can be seen from the above, the filter sample has the ability to work of a device, a variety of communications regimes
(i.e. a function multipotency) can then effectively reduce device number in communication system, reduce equipment volume.It can be obtained by Fig. 3 simultaneously, the filter
The Out-of-band rejection superior performance of wave device sample.
Surface electric field distribution when working in 5GHz to Fig. 1 filter sample calculates, as a result as shown in figure 5, filtering to Fig. 1
Surface electric field distribution when wave device sample works in 18GHz calculates, and learns as a result as shown in fig. 6, by Fig. 5,6, and sample is logical
When with interior work, electric field is even modes, corresponding with its intrinsic mode, electric field energy by local around filter square groove, to
Surrounding spreads very little, this greatly reinforces the ability of filter electromagnetism interference.
Surface electric field distribution when working in 12GHz to Fig. 1 filter sample calculates, as a result as shown in Figure 7.To Fig. 1
Surface electric field distribution when filter sample works in 21GHz calculates, as a result as shown in Figure 8.It is learnt by Fig. 7,8, the filtering
Device is after electric field energy is inputted by filter input end mouth, to decay rapidly outside filter band when 12GH and 21GHz works,
Output end can not be traveled to.Output end can not be passed to just to illustrate, the electromagnetic signal more than this frequency can be effectively isolated, from
And realize filter function, that is, filter out unwanted interference signal.
Detailed description of the invention
Fig. 1 is positive structure schematic of the invention；
Fig. 2 is reverse structure schematic of the invention；
Fig. 3 is the S parameter curve graph of sample；
Fig. 4 be filter cell structure eigen mode dispersion relation curve graph (illustration from left to right be respectively mould 1 and mould 2
Distribution map of the electric field)；
Fig. 5 is vertical electric field distribution map when filter sample works in the first passband 5GHz；
Fig. 6 is vertical electric field distribution map when filter sample works in the second passband 18GHz；
Fig. 7 filter sample works in vertical electric field distribution when 12GHz；
Fig. 8 filter sample works in vertical electric field distribution when 21GHz.
The label in accompanying drawing is: 1- dielectric-slab, 2- metal micro-strip, 21- artificial surface phasmon section, 22- changeover portion,
23- micro-strip waveguide segment, 24- square groove, the side's 25- band, 26- curve, 3- metal.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment.A kind of square groove structure microwave filter with dual band operation characteristic is constituted as illustrated in fig. 1 and 2, packet
Include dielectric-slab 1,1 one surface of dielectric-slab is equipped with metal micro-strip 2, another surface equipped with metal 3；The knot of the metal micro-strip 2
Structure are as follows: the middle part of metal micro-strip 2 is equipped with artificial surface phasmon section 21, and the both ends of artificial surface phasmon section 21 pass through respectively
Changeover portion 22 is connect with micro-strip waveguide segment 23；Along metal micro-strip 2 in the artificial surface phasmon section 21 and changeover portion 22
Length direction the square groove 24 of hollow out is distributed with, the square band 25 through hollow out connects between adjacent two square groove 24；In changeover portion 22
The upper and lower edge of square groove 24 is along changeover portion 22 to the convergent curve 26 of 23 direction gradual change of micro-strip waveguide segment.
Curve 26 above-mentioned is to meet equation X=L1+L2*t3, the curve of Y=h* (exp (b*t-1)/(expb-1))；Its
Middle t is independent variable parameter, and b is curve shape coefficient, and h is 2 width of metal micro-strip；L1For 23 length of micro-strip waveguide segment, L2For transition
22 length of section.
H=2~8mm above-mentioned, L1=5~15mm, L2=10~60mm, t=0~1, b=6.5~80.
Thickness g=0.3~1.2mm of dielectric-slab 1 above-mentioned, side length a=0.5~5.0mm of square groove 24, the width of square band 25
β=0.5~3.0mm, period p=1~8mm of square groove 24.The length L of the artificial surface phasmon section 213It can basis
The size of filter is configured, which only has an impact to the size of filter, does not influence performance of filter.Artificial surface etc.
Length from excimer section 21 can refer to L3=20~80mm.
Working principle: the electromagnetic field of Quasi-TEM mode is transferred to changeover portion 22 by the micro-strip waveguide segment 23 on the left side, in changeover portion
The electromagnetic field of SSPPs mode is gradually faded in 22, and Quasi-TEM mode and the electromagnetic field of SSPPs mode are total in changeover portion 22
It deposits, when artificial surface phasmon section 21, is fully converted to the electromagnetic field of SSPPs mode, and in L3It is transmitted, after transmission
The electromagnetic field that the changeover portion that SSPPs mode electromagnetic field passes through the right again is converted into Quasi-TEM mode is defeated by the micro-strip waveguide segment on the right
Out.When electromagnetic field is propagated in micro-strip waveguide segment 23, the mode of electromagnetic field is Quasi-TEM mode in this section, and the mode electromagnetic field is by beam
With being tied to micro-strip waveguide segment 23 and metal in the medium between 3；When changeover portion 22 is propagated, Quasi-TEM mode and SSPPs mould in the section
Formula coexists, and wherein Quasi-TEM mode electromagnetic field is with being bound in changeover portion 22 and metal in the medium between 3, SSPPs mode electromagnetic field
It is bound in around square groove；In L3It is SSPPs mode in the section when being propagated, which is bound in square groove week
It encloses.
Claims (2)
1. a kind of square groove structure microwave filter with dual band operation characteristic, it is characterised in that: including dielectric-slab (1), be situated between
(1) one surface of scutum is equipped with metal micro-strip (2), and another surface is equipped with metal (3)；The structure of the metal micro-strip (2) are as follows:
The middle part of metal micro-strip (2) is equipped with artificial surface phasmon section (21), and the both ends of artificial surface phasmon section (21) are distinguished
It is connect through changeover portion (22) with micro-strip waveguide segment (23)；Edge in the artificial surface phasmon section (21) and changeover portion (22)
The square groove (24) of hollow out is distributed in the length direction of metal micro-strip (2), and side's band (25) through hollow out connects between adjacent two square groove (24)
It connects；The upper and lower edge of square groove (24) in changeover portion (22) be along changeover portion (22) to micro-strip waveguide segment (23) direction gradually
Become convergent curve (26)；The curve (26) is to meet equation X=L1+L2*t3, Y=h* (exp (b*t-1)/(expb-
1) curve)；Wherein t is independent variable parameter, and b is curve shape coefficient, and h is metal micro-strip (2) width；L1For micro-strip waveguide segment
(23) length, L2For changeover portion (22) length；H=2~the 8mm, L1=5~15mm, L2=10~60mm, t=0~1, b
=6.5~80.
2. the square groove structure microwave filter according to claim 1 with dual band operation characteristic, it is characterised in that: institute
Thickness g=0.3~the 1.2mm for the dielectric-slab (1) stated, side length a=0.5~5.0mm of square groove (24), wide β of the side with (25)=
0.5~3mm, period p=1~8mm of square groove (24).
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|---|---|---|---|
| CN201811057131.8A CN109244609B (en) | 2018-09-11 | 2018-09-11 | A kind of square groove structure microwave filter with dual band operation characteristic |
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| CN109244609B true CN109244609B (en) | 2019-10-29 |
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| CN110739552B (en) * | 2019-10-31 | 2021-10-22 | Oppo广东移动通信有限公司 | Lens structure, lens antenna and electronic equipment |
| CN114709581A (en) * | 2022-05-31 | 2022-07-05 | 深圳小米通讯技术有限公司 | Electromagnetic wave transmission method, transmission line and terminal device |
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| CN105703041A (en) * | 2016-03-28 | 2016-06-22 | 南京航空航天大学 | Artificial surface plasmon-based miniaturized low-pass filter |
| CN108390136A (en) * | 2018-01-23 | 2018-08-10 | 西安电子科技大学 | The method for realizing strange mould artificial surface phasmon guided wave based on complementary trapezoidal shape slot |
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2018
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|---|---|---|---|---|
| US5142255A (en) * | 1990-05-07 | 1992-08-25 | The Texas A&M University System | Planar active endfire radiating elements and coplanar waveguide filters with wide electronic tuning bandwidth |
| CN104701590A (en) * | 2015-03-24 | 2015-06-10 | 南京航空航天大学 | Novel broadband surface plasma band-pass filter |
| CN105119030A (en) * | 2015-09-17 | 2015-12-02 | 南京航空航天大学 | Ultra-wideband artificial surface Plasmon low-pass filter |
| CN105703041A (en) * | 2016-03-28 | 2016-06-22 | 南京航空航天大学 | Artificial surface plasmon-based miniaturized low-pass filter |
| CN108390136A (en) * | 2018-01-23 | 2018-08-10 | 西安电子科技大学 | The method for realizing strange mould artificial surface phasmon guided wave based on complementary trapezoidal shape slot |
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| Novel Surface Plasmon Polariton Waveguides with Enhanced Field Confinement for Microwave-Frequency Ultra-Wideband Bandpass Filters;Ying Jiang Guo, Kai Da Xu, Yanhui Liu, Xiaohong Tang;《IEEE Access》;20180315;第6卷;第10250页右栏第Ⅱ部分至第10252页左栏末，图1-3 * |
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