CN105742769B - The adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint - Google Patents
The adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint Download PDFInfo
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- CN105742769B CN105742769B CN201610103128.XA CN201610103128A CN105742769B CN 105742769 B CN105742769 B CN 105742769B CN 201610103128 A CN201610103128 A CN 201610103128A CN 105742769 B CN105742769 B CN 105742769B
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- microstrip line
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- uniform impedance
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- strip resonantor
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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
Abstract
The invention discloses a kind of adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint, comprising two blocks of two-sided dielectric-slabs for covering metal being overlapped mutually, wherein, the upper surface metal of top dielectric plate is made as feed structure, and lower surface metal is all removed；The upper surface metal of layer dielectric plate is made as T-shaped dual-mode resonator, and lower surface metal is all retained as earth plate；T-shaped dual-mode resonator is to be superimposed the T-shaped structure formed by the micro-band branch line of terminal open circuit and the uniform impedance micro-strip resonantor of a both ends open circuit；Feed structure is using the uniform impedance microstrip line of a pair of terminal open circuits as input microstrip line and output microstrip line, and its open end is apart from the odd-multiple that uniform impedance micro-strip resonantor is a quarter harmonic frequency corresponding wavelength.The present invention realizes the adjustable of harmonics restraint, can suppress the harmonic wave of two different frequencies simultaneously on the premise of original dual mode filter advantage is maintained, and can be widely applied in the design of frequency microwave passive circuit.
Description
Technical field
The present invention relates to a kind of adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint, belong to microwave technical field.
Background technology
Wave filter is a kind of in microwave and the passive device being widely used in radio frequency applications, the fine or not direct shadow of its index
The performance of whole system is rung.Common microwave filter uses metal waveguide/Medium Wave Guide, coaxial line or planar microstrip more
Line/strip line makes.
In recent years, because communication system is strong all the more to the demand of AF panel, as the Key Passive Components in system
One of, to the harmonics restraint design requirement of wave filter also more and more higher.Using the microwave filter of planar technology with respect to waveguide or
For the stereochemical structures such as coaxial line are realized, have it is simple in construction, it is easy to process, it is cheap and be easy to and other active/nothings
The integrated advantage of source circuit, is greatly paid close attention in recent years.Wherein, harmonic restraining function is had based on micro-strip resonantor
Wave filter is even more the key object studied.
The existing wave filter with harmonic restraining function is mostly by resonator design into the absence of some higher modes, so as to reach
To the purpose of harmonics restraint, but on the one hand such design adds the difficulty of resonator design, on the other hand, the harmonic wave of suppression
Frequency is fixed so as to uncontrollable, greatly reduces flexibility and the scope of application of design.
The content of the invention
The technical problems to be solved by the invention are to be directed to the defects of involved in background technology, there is provided a kind of harmonic wave suppression
Make adjustable plane bimodulus T-shaped bandpass filter, maintain filter passband performance it is constant on the premise of, realize harmonic wave suppression
That makes is adjustable, can suppress the harmonic wave of two different frequencies simultaneously.
The present invention uses following technical scheme to solve above-mentioned technical problem：
The present invention provides a kind of adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint, is overlapped mutually comprising two pieces
The two-sided dielectric-slab for covering metal, wherein, the upper surface metal of top dielectric plate is made as feed structure, and lower surface metal is all clear
Remove；The upper surface metal of layer dielectric plate is made as T-shaped dual-mode resonator, and lower surface metal is all retained as earth plate；T-shaped
Dual-mode resonator is by the uniform impedance micro-strip resonantor superposition of the micro-band branch line and a both ends open circuit of a terminal open circuit
The T-shaped structure of formation；Feed structure as input microstrip line and is exported micro- using the uniform impedance microstrip line of a pair of terminal open circuits
Band line；From the point of view of vertical top dielectric plate, input microstrip line and export microstrip line respectively with it is equal in T-shaped dual-mode resonator
Intersect at the both ends of even impedance microstrip resonator；Input microstrip line and export the open end and uniform impedance micro-strip resonantor of microstrip line
The distance between be a quarter harmonic frequency corresponding wavelength odd-multiple.
As the further prioritization scheme of the present invention, input microstrip line and the characteristic impedance for exporting microstrip line are 50 ohm,
A length of 23.6 millimeters, a width of 1.0 millimeters, a length of 11.7mm of micro-band branch line of uniform impedance micro-strip resonantor, it is a width of
1.0mm, the dielectric constant of dielectric-slab is 10.2, thickness is 0.635 millimeter, and the open end for inputting microstrip line is micro- apart from uniform impedance
Band resonator 6.6mm, exports the open end of microstrip line apart from resonator 6.6mm.
As the further prioritization scheme of the present invention, input microstrip line and the characteristic impedance for exporting microstrip line are 50 ohm,
A length of 23.6 millimeters, a width of 1.0 millimeters, a length of 11.7mm of micro-band branch line of uniform impedance micro-strip resonantor, it is a width of
1.0mm, the dielectric constant of dielectric-slab is 10.2, thickness is 0.635 millimeter, and the open end for inputting microstrip line is micro- apart from uniform impedance
Band resonator 4.4mm, exports the open end of microstrip line apart from uniform impedance micro-strip resonantor 4.4mm.
As the further prioritization scheme of the present invention, input microstrip line and the characteristic impedance for exporting microstrip line are 50 ohm,
A length of 23.6 millimeters, a width of 1.0 millimeters, a length of 11.7mm of micro-band branch line of uniform impedance micro-strip resonantor, it is a width of
1.0mm, the dielectric constant of dielectric-slab is 10.2, thickness is 0.635 millimeter, and the open end for inputting microstrip line is micro- apart from uniform impedance
Band resonator 6.9mm, exports the open end of microstrip line apart from uniform impedance micro-strip resonantor 4.0mm.
The present invention compared with prior art, has following technique effect using above technical scheme：
It is 1. simple in construction；
2. be easy to make, be lost it is small；
3. harmonics restraint is adjustable.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is transmission and the schematic diagram of reflection characteristic of the adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint.
In figure, 1- input/output microstrip lines, 2- micro-band branch lines, 3- uniform impedance micro-strip resonantors, 4- dielectric-slabs.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
The invention discloses a kind of adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint, it is overlapped mutually comprising two pieces
The two-sided dielectric-slab for covering metal, wherein, the upper surface metal of top dielectric plate is made as feed structure, and lower surface metal is whole
Remove；The upper surface metal of layer dielectric plate is made as T-shaped dual-mode resonator, and lower surface metal is all retained as earth plate；T
Shape dual-mode resonator is folded by the micro-band branch line of terminal open circuit and the uniform impedance micro-strip resonantor of a both ends open circuit
Add the T-shaped structure to be formed；Feed structure is using the uniform impedance microstrip line of a pair of terminal open circuits as input microstrip line and output
Microstrip line.From the point of view of vertical top dielectric plate, input microstrip line and export microstrip line respectively with T-shaped dual-mode resonator
Intersect at the both ends of uniform impedance micro-strip resonantor.The open end for inputting microstrip line and output microstrip line is humorous apart from uniform impedance micro-strip
The device that shakes is the odd-multiple of wavelength corresponding to a quarter harmonic frequency.
The core of the adjustable T-shaped dual mode filter of harmonics restraint of the present invention is the open end of microstrip feed line apart from uniform impedance
Micro-strip resonantor is the odd-multiple of wavelength corresponding to a quarter harmonic frequency.Because at harmonic frequency, microstrip feed line is opened
Terminal is apart from the odd-multiple that uniform impedance micro-strip resonantor is wavelength corresponding to a quarter harmonic frequency, so feeder line and resonance
Stiffness of coupling is very weak between device, is not enough to encourage higher mode to propagate in resonator, so as to reach the purpose of harmonics restraint.
Embodiment 1：As shown in figure 1, input microstrip line and the characteristic impedance for exporting microstrip line are 50 ohm, uniform impedance is micro-
A length of 23.6 millimeters, a width of 1.0 millimeters, a length of 11.7mm of micro-band branch line, a width of 1.0mm with resonator, dielectric-slab
Dielectric constant is 10.2, thickness is 0.635 millimeter, in order to realize the good suppression to second harmonic, inputs the open circuit of microstrip line
End exports the open end of microstrip line apart from uniform impedance micro-strip resonantor 6.6mm apart from uniform impedance micro-strip resonantor 6.6mm.
Embodiment 2：As shown in figure 1, input microstrip line and the characteristic impedance for exporting microstrip line are 50 ohm, uniform impedance is micro-
A length of 23.6 millimeters, a width of 1.0 millimeters, a length of 11.7mm of micro-band branch line, a width of 1.0mm with resonator, dielectric-slab
Dielectric constant is 10.2, thickness is 0.635 millimeter, in order to realize the good suppression to triple-frequency harmonics, inputs the open circuit of microstrip line
End exports the open end of microstrip line apart from uniform impedance micro-strip resonantor 4.4mm apart from uniform impedance micro-strip resonantor 4.4mm.
Embodiment 3：As shown in figure 1, input microstrip line and the characteristic impedance for exporting microstrip line are 50 ohm, uniform impedance is micro-
A length of 23.6 millimeters, a width of 1.0 millimeters, a length of 11.7mm of micro-band branch line, a width of 1.0mm with resonator, dielectric-slab
Dielectric constant is 10.2, thickness is 0.635 millimeter, in order to realize to secondary and triple-frequency harmonics good suppression, inputs microstrip line
Open end apart from uniform impedance micro-strip resonantor 6.9mm, export the open end of microstrip line apart from uniform impedance micro-strip resonantor
4.0mm。
Fig. 2 gives the wave filter scattering parameters curve of above three embodiment, and this uses the new harmonic as seen from Figure 2
Suppress design method, can significantly improve harmonics restraint performance.From Figure 2 it can be seen that opened a way by using different microstrip feed lines
Spacing between end and uniform impedance micro-strip resonantor, it is possible to achieve the regulation of harmonics restraint, the secondary and suppression of triple-frequency harmonics
Below -20dB；Matching simultaneously in passband is good, and minimum in-band insertion loss is only 0.9dB.Experiment shows, this filter
Ripple device designs the actual application value that can significantly improve wave filter, while structure is simplified, convenient processing.
Those skilled in the art of the present technique are it is understood that unless otherwise defined, all terms used herein（Including skill
Art term and scientific terminology）With the general understanding identical meaning with the those of ordinary skill in art of the present invention.Also
It should be understood that those terms defined in such as general dictionary should be understood that with the context of prior art
The consistent meaning of meaning, and unless defined as here, will not be explained with the implication of idealization or overly formal.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
It is bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in the present invention
Protection domain within.
Claims (4)
1. the adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint, include two pieces of two-sided media for covering metal being overlapped mutually
Plate, it is characterised in that in two blocks of dielectric-slabs, the upper surface metal of top dielectric plate is made as feed structure, and lower surface metal is complete
Remove in portion；The upper surface metal of layer dielectric plate is made as T-shaped dual-mode resonator, and lower surface metal is all retained as being grounded
Plate；
T-shaped dual-mode resonator is the uniform impedance micro-band resonance of the micro-band branch line and a both ends open circuit by terminal open circuit
Device is superimposed the T-shaped structure to be formed；Feed structure using the uniform impedance microstrip line of a pair of terminal open circuits as input microstrip line and
Export microstrip line；From the point of view of vertical top dielectric plate, input microstrip line and export microstrip line respectively with T-shaped dual-mode resonator
In the both ends of uniform impedance micro-strip resonantor intersect；Input microstrip line and export the open end and uniform impedance micro-strip of microstrip line
The distance between resonator is the odd-multiple of a quarter harmonic frequency corresponding wavelength.
2. the adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint according to claim 1, it is characterised in that input
The characteristic impedance of microstrip line and output microstrip line is 50 ohm, a length of 23.6 millimeters of uniform impedance micro-strip resonantor, a width of 1.0
Millimeter, a length of 11.7mm of micro-band branch line, a width of 1.0mm, the dielectric constant of dielectric-slab is 10.2, thickness is 0.635 millimeter,
The open end of microstrip line is inputted apart from uniform impedance micro-strip resonantor 6.6mm, exports the open end of microstrip line apart from uniform impedance
Micro-strip resonantor 6.6mm.
3. the adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint according to claim 1, it is characterised in that input
The characteristic impedance of microstrip line and output microstrip line is 50 ohm, a length of 23.6 millimeters of uniform impedance micro-strip resonantor, a width of 1.0
Millimeter, a length of 11.7mm of micro-band branch line, a width of 1.0mm, the dielectric constant of dielectric-slab is 10.2, thickness is 0.635 millimeter,
The open end of microstrip line is inputted apart from uniform impedance micro-strip resonantor 4.4mm, exports the open end of microstrip line apart from uniform impedance
Micro-strip resonantor 4.4mm.
4. the adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint according to claim 1, it is characterised in that input
The characteristic impedance of microstrip line and output microstrip line is 50 ohm, a length of 23.6 millimeters of uniform impedance micro-strip resonantor, a width of 1.0
Millimeter, a length of 11.7mm of micro-band branch line, a width of 1.0mm, the dielectric constant of dielectric-slab is 10.2, thickness is 0.635 millimeter,
The open end of microstrip line is inputted apart from uniform impedance micro-strip resonantor 6.9mm, exports the open end of microstrip line apart from uniform impedance
Micro-strip resonantor 4.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610103128.XA CN105742769B (en) | 2016-02-25 | 2016-02-25 | The adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint |
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|---|---|---|---|
| CN201610103128.XA CN105742769B (en) | 2016-02-25 | 2016-02-25 | The adjustable plane bimodulus T-shaped bandpass filter of harmonics restraint |
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| Publication Number | Publication Date |
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| CN105742769A CN105742769A (en) | 2016-07-06 |
| CN105742769B true CN105742769B (en) | 2018-03-09 |
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| CN106450604B (en) * | 2016-09-29 | 2019-04-09 | 南京邮电大学 | A kind of adjustable plane bimodulus balun bandpass filter of transmission zero |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694898A (en) * | 2009-10-16 | 2010-04-14 | 南京邮电大学 | Bimodule annular resonant cavity band-pass filter with direct feed planar structure |
| CN102255125A (en) * | 2010-09-21 | 2011-11-23 | 上海大学 | Novel double-frequency narrow-band bandpass filter |
| CN103474731A (en) * | 2013-09-05 | 2013-12-25 | 湖北文理学院 | Branch knot loading compact type microstrip filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI513091B (en) * | 2013-01-04 | 2015-12-11 | Nat Univ Tsing Hua | Wideband high frequency bandpass filter |
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2016
- 2016-02-25 CN CN201610103128.XA patent/CN105742769B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694898A (en) * | 2009-10-16 | 2010-04-14 | 南京邮电大学 | Bimodule annular resonant cavity band-pass filter with direct feed planar structure |
| CN102255125A (en) * | 2010-09-21 | 2011-11-23 | 上海大学 | Novel double-frequency narrow-band bandpass filter |
| CN103474731A (en) * | 2013-09-05 | 2013-12-25 | 湖北文理学院 | Branch knot loading compact type microstrip filter |
Non-Patent Citations (1)
| Title |
|---|
| 一种小型化超宽带微带带通滤波器;黄晓东;《中国科技论文》;20131031;第8卷(第10期);第955-958页 * |
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Effective date of registration: 20200702 Address after: 2/F, Unit B, 300 Zhihui Road, Kirin Science and Technology Innovation Park, Nanjing, Jiangsu Province, 211000 Patentee after: Nanjing Youqing Electronic Technology Co., Ltd Address before: 210003 Gulou District, Jiangsu, Nanjing new model road, No. 66 Patentee before: NANJING University OF POSTS AND TELECOMMUNICATIONS |
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