CN108417937B - Reflection-free coplanar waveguide band-stop filter - Google Patents
Reflection-free coplanar waveguide band-stop filter Download PDFInfo
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- CN108417937B CN108417937B CN201810133896.9A CN201810133896A CN108417937B CN 108417937 B CN108417937 B CN 108417937B CN 201810133896 A CN201810133896 A CN 201810133896A CN 108417937 B CN108417937 B CN 108417937B
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- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
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Abstract
A reflection-free coplanar waveguide band elimination filter relates to a filter, which comprises a dielectric substrate (1), a metal layer (11), a coplanar waveguide (2) and a plurality of resonant slot rings (3); the coplanar waveguide (2) is positioned on the metal layer (11) on one surface of the dielectric substrate (1); on a grounding plate (22) of the coplanar waveguide (2), an absorption region (4) is formed by a plurality of resonant slot rings (3); the resonance frequency of the resonance slit ring (3) can be changed to adjust the stop band center frequency of the filter; the distance (31) between adjacent resonant slot rings (3) parallel to the transmission direction of the coplanar waveguide (2) is large to avoid energy transmission in the absorption region (4) along the transmission direction of the coplanar waveguide (2). The band-stop filter can absorb signals in the stop band and reduce standing waves in the stop band, so that the performance of the system is improved.
Description
Technical Field
The invention relates to a filter, in particular to a reflection-free coplanar waveguide band-stop filter.
Background
The filter is a common and important circuit unit, the frequency response of the filter has a pass band and a stop band, and in the pass band, the insertion loss and the reflection of signals passing through the filter are small; at the stop band, the insertion loss through the filter is large, and the signal is usually reflected by the filter, so that the attenuation of the signal at the frequency band of the stop band is large, thereby realizing the stop band function. Therefore, the reflection of the conventional band-stop filter in the stop band is large, and the reflected signals influence the working state of the front stage unit of the filter.
Disclosure of Invention
The invention aims to provide a non-reflection coplanar waveguide band-stop filter which has large transmission loss and small reflection in a stop band and does not influence the working state of a front-stage unit or a rear-stage unit.
The technical scheme is as follows: a non-reflection coplanar waveguide band-stop filter comprises a dielectric substrate, a coplanar waveguide and a plurality of resonant slot rings; one side of the dielectric substrate is a metal layer, and the coplanar waveguide is positioned on the metal layer; on the grounding plates at two sides of the conduction band of the coplanar waveguide, a plurality of resonant gap rings form an absorption region; the resonant slot ring consists of an inner slot strip ring and an outer slot strip ring which are concentric, the inner slot strip ring and the outer slot strip ring are respectively provided with a metal conductor section, and the metal conductor sections of the inner slot strip ring and the outer slot strip ring are positioned at two sides of the circle center of the inner slot strip ring and the outer slot strip ring; the distance between the adjacent resonant slot rings along the transmission direction of the coplanar waveguide is larger than the outer diameter of the outer slot strip ring of the resonant slot ring, so that the coupling of energy between the adjacent resonant slot rings along the transmission direction of the coplanar waveguide in the absorption region is reduced, and the influence on the depth of a stop band caused by the transmission of the energy along the transmission direction of the coplanar waveguide in the absorption region is avoided; the distance between the adjacent resonant gap rings and the transmission direction of the coplanar waveguide is changed, so that the depth of a stop band of the band-stop filter can be adjusted, the smaller the distance is, the stronger the coupling capacity of the adjacent resonant gap rings along the transmission direction of the coplanar waveguide is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; changing the resonant frequency of the resonant slot ring can adjust the stop band center frequency of the filter.
The shape of the inner gap strip ring and the outer gap strip ring of the resonant gap ring, the perimeter and the thickness of the inner gap strip ring and the outer gap strip ring, and the size of the metal conductor sections of the inner gap strip ring and the outer gap strip ring are changed, so that the center frequency of a stop band and the bandwidth of the stop band of the non-reflection single-conductor surface wave transmission line band stop filter can be adjusted.
The more the number of the resonant slot rings parallel to the transmission direction of the coplanar waveguide is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; the more the number of the resonant gap rings vertical to the transmission direction of the coplanar waveguide is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; the closer the absorption region is to the conduction band, the stronger the absorption capability of the stop band filter, and the deeper the depth of the stop band.
Electromagnetic waves are transmitted along the transmission direction of the coplanar waveguide after being input from the input port of the nonreflecting coplanar waveguide band elimination filter. The electromagnetic waves interact with the absorption region during transmission towards the output end. In the pass band of the band-stop filter, the absorption region basically presents total reflection characteristics and meets the transverse resonance condition of a transmission line transmission mode; in the stop band of the band stop filter, part of the electromagnetic wave energy is coupled to the absorption region. In the absorption region, the distance between the adjacent resonant slot rings perpendicular to the transmission direction of the coplanar waveguide is small, the coupling is strong, while the distance between the adjacent resonant slot rings parallel to the transmission direction of the coplanar waveguide is large, the coupling is weak, so that the electromagnetic wave is mainly transmitted along the transmission direction perpendicular to the coplanar waveguide in the absorption region. Due to the loss of the dielectric substrate and the conductor loss of the metal, when the frequency of the electromagnetic wave is close to the resonant frequency of the resonant slot ring, the energy of the electromagnetic wave transmitted perpendicular to the transmission direction of the coplanar waveguide is absorbed or radiated, so that the loss of the transmission energy is caused, and a stop band of the band-stop filter is formed. At the outer edge of the grounding plate, the residual electromagnetic wave energy is reflected back to the absorption region, is continuously absorbed or radiated by the resonant slot ring, then returns to the central region of the coplanar waveguide, and is divided into two paths, one path faces to the input end to form the standing wave reflection of the band-stop filter, and the other path faces to the output end to influence the inhibition of the stop band. The absorption region is designed to prevent electromagnetic waves from propagating in a direction parallel to the transmission direction of the coplanar waveguide, because electromagnetic waves propagating in this direction couple back into the central region of the coplanar waveguide, forming standing waves and affecting stop band suppression, and therefore the spacing between the resonant slot rings is suitably large in the transmission direction parallel to the coplanar waveguide. The larger the number of the resonant slot rings vertical to the transmission direction of the coplanar waveguide, the larger the energy loss of the electromagnetic waves transmitted along the direction, the stronger the absorption capacity of the stop band filter, the deeper the depth of the stop band, and the smaller the reflection of the stop band. The closer the absorption region is to the conduction band, the higher the absorption capacity of the stop band filter, but the larger the discontinuity at the input end, the higher the standing waves at the pass band and stop band of the filter.
In the non-reflection coplanar waveguide band elimination filter, a grounding plate near a coplanar waveguide conduction band has an absorption region; in the absorption region, a series of resonant gap rings which are adjacent end to end, have small adjacent distance and large adjacent coupling actually form a resonant gap ring periodic structure transmission line; the absorption region is provided with a plurality of transmission lines with periodic structures, one end of each transmission line is arranged in the region of the absorption region close to the conduction band, and the other end of each transmission line is arranged in the region away from the conduction band; when the frequency is close to the resonance frequency of the resonance slot ring or the pass band of the resonance slot ring periodic structure transmission line, the electromagnetic wave entering from the input port of the coplanar waveguide is transmitted and coupled to the resonance slot ring periodic structure transmission line at the same time, and the resonance slot ring periodic structure transmission line can absorb and radiate the electromagnetic wave at the same time of transmitting, so that a non-reflection stop band of the filter is formed; at the pass band frequency of the filter, the resonant slot rings are detuned, the resonant slot ring periodic structure transmission line is equivalent to a reactance, electromagnetic waves entering from an input port cannot enter the resonant slot ring periodic structure transmission line, and therefore the electromagnetic waves are reflected by an absorption area and cannot be absorbed or radiated, and only can reach an output port of the filter to form the pass band of the filter.
The transmission direction of the resonant slot ring periodic structure transmission line can be a straight line or a curve, or a plurality of resonant slot ring periodic structure transmission lines can be branched from one resonant slot ring periodic structure transmission line, as long as the ports of the resonant slot ring periodic structure transmission lines are not close to the input port and the output port, the electromagnetic waves are prevented from being transmitted from the input port to the output port by means of the resonant slot ring periodic structure transmission line.
The geometric dimension of the resonant slot ring can be adjusted in the design, and filtering can be performed on different frequency points. Generally speaking, the geometric dimension of the resonant slot ring is the key for controlling the resonant frequency, and the larger the dimension is, the lower the resonant frequency is, and the lower the center frequency point of the stop band is; conversely, the smaller the size is, the higher the resonant frequency is, and the higher the stopband center frequency point is; the shape and thickness of the resonant slot ring, and the size of the slot opening also affect the resonant frequency, and adjusting these parameters can change the resonant frequency and thereby control the stop band frequency.
Has the advantages that: the reflection-free coplanar waveguide band-stop filter has the advantages that signals in a stop band can be absorbed, standing waves in the stop band are reduced, and accordingly the performance of a system is improved, and the reflection-free coplanar waveguide band-stop filter is particularly significant for a high-power radio frequency microwave system.
Drawings
Fig. 1 is a schematic structural diagram of a reflection-free coplanar waveguide band-stop filter.
The figure shows that: the resonator comprises a dielectric substrate 1, a coplanar waveguide 2, a resonant slot ring 3, an absorption region 4, a port 5, a metal layer 11, a conduction band 21, a ground plate 22, a transmission direction interval 31 and a transmission direction vertical interval 32.
Detailed Description
The invention is further illustrated by the following figures and examples.
The invention relates to a reflection-free coplanar waveguide band elimination filter, which comprises a dielectric substrate 1, a coplanar waveguide 2 and a plurality of resonant slot rings 3; one surface of the dielectric substrate 1 is a metal layer 11, and the coplanar waveguide 2 is positioned on the metal layer 11; on the ground plate 22 at both sides of the conduction band 21 of the coplanar waveguide 2, the absorption region 4 is composed of a plurality of resonant slot rings 3; the resonance gap ring 3 consists of an inner gap strip ring and an outer gap strip ring which are concentric, the inner gap strip ring and the outer gap strip ring are respectively provided with a metal conductor section, and the metal conductor sections of the inner gap strip ring and the outer gap strip ring are positioned at two sides of the circle center of the inner gap strip ring and the outer gap strip ring; the distance 31 between the adjacent resonant slot rings 3 along the transmission direction of the coplanar waveguide 2 is larger than the outer diameter of the outer slot strip ring of the resonant slot ring 3, so that the coupling of energy between the adjacent resonant slot rings 3 along the transmission direction of the coplanar waveguide 2 in the absorption region 4 is reduced, and the influence on the depth of a stop band caused by the transmission of energy along the transmission direction of the coplanar waveguide 2 in the absorption region 4 is avoided; the distance 32 between the adjacent resonant gap rings 3 and the transmission direction of the coplanar waveguide 2 is changed, so that the depth of the stop band of the band-stop filter can be adjusted, the smaller the distance is, the stronger the coupling capacity of the adjacent resonant gap rings 3 along the transmission direction perpendicular to the coplanar waveguide 2 is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; changing the resonant frequency of the resonant slot ring 3 can adjust the stop band center frequency of the filter.
The shape of the inner gap strip ring and the outer gap strip ring of the resonance gap ring 3, the perimeter and the thickness of the inner gap strip ring and the outer gap strip ring, and the size of the metal conductor sections of the inner gap strip ring and the outer gap strip ring are changed, so that the center frequency of the stop band and the bandwidth of the stop band of the non-reflection coplanar waveguide band-stop filter can be adjusted.
The more the number of the resonant gap rings 3 parallel to the transmission direction of the coplanar waveguide 2 is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; the more the number of the resonant gap rings 3 vertical to the transmission direction of the coplanar waveguide 2 is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; the closer the absorption region 4 is to the conduction band 21, the stronger the absorption capability of the stop band filter and the deeper the depth of the stop band. The dielectric substrate 1 is an epoxy resin plate with a copper foil attached to the surface.
Electromagnetic waves are input from one port 5 of the nonreflecting coplanar waveguide band elimination filter and then transmitted along the transmission direction of the coplanar waveguide 2. The electromagnetic waves will interact with the absorption region 4 during their transmission towards the other port 6 of the band stop filter. In the pass band of the band-stop filter, the absorption region 4 basically presents a total reflection characteristic and meets the transverse resonance condition of a transmission line transmission mode; in the stop band of the band stop filter, a part of the electromagnetic wave energy is coupled to the absorption region 4. In the absorption region 4, the distance 32 between the adjacent resonant slot rings 3 perpendicular to the transmission direction of the coplanar waveguide 2 is small, the coupling is strong, and the distance 31 between the adjacent resonant slot rings 3 parallel to the transmission direction of the coplanar waveguide 2 is large, the coupling is weak, so that the electromagnetic wave is mainly transmitted along the transmission direction perpendicular to the coplanar waveguide 2 in the absorption region 4. Due to the loss of the dielectric substrate 1 and the conductor loss of the metal, when the frequency of the electromagnetic wave approaches the resonant frequency of the resonant slot ring 3, the energy of the electromagnetic wave transmitted perpendicular to the transmission direction of the coplanar waveguide 2 is absorbed or radiated, thereby causing the loss of the transmission energy and forming the stop band of the band-stop filter. At the outer edge of the grounding plate 22, the remaining electromagnetic wave energy is reflected back to the absorption region 4, is continuously absorbed or radiated by the resonant slot ring 3, then returns to the coplanar waveguide 2, and is divided into two paths, one path faces to the input port 5 to form the standing wave reflection of the band stop filter, and the other path faces to the output port 5 to influence the rejection of the stop band. The absorption region 4 is intended to prevent the transmission of electromagnetic waves in a direction parallel to the propagation direction of the coplanar waveguide 2, since the electromagnetic waves propagating in this direction couple back into the central region 23 of the coplanar waveguide 2, forming standing waves, affecting the stop band suppression, and therefore the spacing 31 of the resonant slot rings 3 is suitably large in the direction parallel to the propagation direction of the coplanar waveguide 2. The more the number of the resonant slot rings 3 vertical to the transmission direction of the coplanar waveguide 2 is, the larger the energy loss of the electromagnetic waves transmitted along the direction is, the stronger the absorption capacity of the stop band filter is, the deeper the stop band is, and the smaller the reflection of the stop band is. The closer the absorption region 4 is to the conduction band 21, the higher the absorption capacity of the stop band filter, but the larger the discontinuity, the greater the standing waves at the pass band and stop band of the filter.
In the non-reflection coplanar waveguide band-stop filter, a grounding plate 22 near a coplanar waveguide conduction band 21 is provided with an absorption region 4; in the absorption region 4, a series of resonant gap rings 3 which are adjacent end to end, have small adjacent spacing and large adjacent coupling actually form a resonant gap ring periodic structure transmission line; the absorption region 4 has a plurality of transmission lines of such periodic structure, one end of which is in a region of the absorption region 4 close to the conduction band 21 and the other end is in a region away from the conduction band 21; when the frequency is close to the resonance frequency of the resonance slot ring 3 or the pass band of the resonance slot ring periodic structure transmission line, the electromagnetic wave entering from the port 5 of the coplanar waveguide input is coupled to the resonance slot ring 3 periodic structure transmission line while transmitting, and the resonance slot ring 3 periodic structure transmission line can absorb and radiate the electromagnetic wave while transmitting, so that a non-reflection stop band of the filter is formed; at the pass band frequency of the filter, the resonant slot-ring 3 is detuned, the resonant slot-ring 3 periodic structure transmission line is equivalent to a reactance, and electromagnetic waves entering from the input port 5 cannot enter the resonant slot-ring periodic structure transmission line, so that the electromagnetic waves are reflected by the absorption region and cannot be absorbed or radiated, and only reach the output port 5 of the filter to form the pass band of the filter.
The transmission direction of the resonant slot ring 3 periodic structure transmission line can be a straight line or a curve, and a plurality of resonant slot ring 3 periodic structure transmission lines can also be branched from one resonant slot ring 3 periodic structure transmission line; of the two ports of each resonant slot-ring 3 periodic structure transmission line, only one port can be located in the absorption region 4 near the conduction band 21, neither both ports can be located in the absorption region 4 near the conduction band 21, nor one port can be located in the absorption region 4 near the conduction band 21 and the other port can be located near the input port 5 or the output port 5, thus avoiding electromagnetic waves from being transmitted from the input port 5 to the output port 5 by means of the resonant slot-ring 3 periodic structure transmission line.
The absorption region 4 may be a ground plane 22 on both sides of the conduction band 21 of the coplanar waveguide 2 or may be only in one ground plane 22 on the conduction band 21 side of the coplanar waveguide 2. In terms of process, the reflection-free coplanar waveguide band-stop filter can be realized by adopting a common Printed Circuit Board (PCB) process, a low temperature co-fired ceramic (LTCC) process or an integrated circuit process.
The present invention can be realized in light of the above.
Claims (5)
1. A non-reflection coplanar waveguide band-stop filter is characterized in that the non-reflection coplanar waveguide band-stop filter comprises a dielectric substrate (1), a coplanar waveguide (2) and a plurality of resonant slot rings (3); one surface of the dielectric substrate (1) is a metal layer (11), and the coplanar waveguide (2) is positioned on the metal layer (11); on the ground plates (22) at both sides of the conduction band (21) of the coplanar waveguide (2), an absorption region (4) is formed by a plurality of resonant slot rings (3); the distance (31) between the adjacent resonant slot rings (3) along the transmission direction of the coplanar waveguide (2) is larger than the outer diameter of the outer slot strip ring of the resonant slot rings (3) so as to reduce the energy transmission direction of the absorption region (4) along the coplanar waveguide (2) and avoid the energy transmission direction of the coplanar waveguide (2) at the absorption region (4) through the coupling between the adjacent resonant slot rings (3) to influence the depth of the stop band; changing the distance (32) between the adjacent resonant gap rings (3) and the coplanar waveguide (2) in the transmission direction, and adjusting the depth of the stop band of the band-stop filter, wherein the smaller the distance is, the stronger the coupling capacity of the adjacent resonant gap rings (3) in the transmission direction perpendicular to the coplanar waveguide (2) is, the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; changing the resonance frequency of the resonant slot ring (3) adjusts the stop band center frequency of the filter.
2. A reflection-free coplanar waveguide band reject filter according to claim 1, characterized in that the larger the number of the resonance slit rings (3), the stronger the absorption capacity of the stop band filter, the deeper the stop band depth and the smaller the reflection of the stop band; the more the number of the resonant gap rings (3) vertical to the transmission direction of the coplanar waveguide (2), the stronger the absorption capacity of the stop band filter is, the deeper the depth of the stop band is, and the smaller the reflection of the stop band is; the closer the absorption region (4) is to the conduction band (21), the stronger the absorption capability of the stop band filter and the deeper the depth of the stop band.
3. A reflection-free coplanar waveguide band reject filter according to claim 1, characterized in that the resonant slot ring (3) consists of concentric inner and outer slot strip rings, each having a metal conductor section, the metal conductor sections of the inner and outer slot strip rings being located on either side of the center of the inner and outer slot strip rings.
4. A reflectionless coplanar waveguide band reject filter according to claim 3, characterized in that the resonant slot ring (3) can adjust the stopband center frequency and the stopband bandwidth of the reflectionless coplanar waveguide band reject filter by changing the shape of the inner slot strip ring and the outer slot strip ring, the perimeter and thickness of the inner slot strip ring and the outer slot strip ring, and the size of the metal conductor segments of the inner slot strip ring and the outer slot strip ring.
5. The filter according to claim 1, wherein the dielectric substrate (1) is an epoxy resin plate with a copper foil on the surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810133896.9A CN108417937B (en) | 2018-02-07 | 2018-02-07 | Reflection-free coplanar waveguide band-stop filter |
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| CN201810133896.9A CN108417937B (en) | 2018-02-07 | 2018-02-07 | Reflection-free coplanar waveguide band-stop filter |
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| CN108417937B true CN108417937B (en) | 2020-06-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204516875U (en) * | 2015-04-23 | 2015-07-29 | 南京邮电大学 | Based on the coplanar waveguide ultra wide band band pass filter of pbg structure |
| CN105896006A (en) * | 2016-05-18 | 2016-08-24 | 六盘水师范学院 | Split ring-loaded microwave band-pass filter |
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2018
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204516875U (en) * | 2015-04-23 | 2015-07-29 | 南京邮电大学 | Based on the coplanar waveguide ultra wide band band pass filter of pbg structure |
| CN105896006A (en) * | 2016-05-18 | 2016-08-24 | 六盘水师范学院 | Split ring-loaded microwave band-pass filter |
Non-Patent Citations (1)
| Title |
|---|
| Phenomenon study of a microstrip line on a Slot Split Ring Resonators defected ground plane;Shah Nawaz Burokur et al.;《2005 IEEE Antennas and Propagation Society International Symposium》;20050708;第II、III部分，图1、2 * |
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