CN108417937A - Areflexia co-planar waveguide bandstop filter - Google Patents
Areflexia co-planar waveguide bandstop filter Download PDFInfo
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- CN108417937A CN108417937A CN201810133896.9A CN201810133896A CN108417937A CN 108417937 A CN108417937 A CN 108417937A CN 201810133896 A CN201810133896 A CN 201810133896A CN 108417937 A CN108417937 A CN 108417937A
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- stopband
- resonant slot
- filter
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- 206010003084 Areflexia Diseases 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 92
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims description 13
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 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 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 230000000737 periodic effect Effects 0.000 description 24
- 238000007493 shaping process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Areflexia co-planar waveguide bandstop filter is related to a kind of filter, which includes medium substrate (1), metal layer (11), co-planar waveguide (2) and multiple resonant slot rings (3)；Co-planar waveguide (2) is located on the metal layer (11) of the one side of medium substrate (1)；On the earth plate (22) of co-planar waveguide (2), uptake zone (4) is formed by multiple resonant slot rings (3)；The stopband center frequency of filter can be adjusted by changing the resonant frequency of resonant slot ring (3)；Adjacent resonant slot ring (3) is parallel to co-planar waveguide (2) transmission direction spacing (31), to be transmitted along the transmission direction of co-planar waveguide (2) in uptake zone (4) to avoid energy greatly.The bandstop filter can fall stopband signal absorption, reduce the standing wave of stopband, so as to improve the performance of system.
Description
Technical field
The present invention relates to a kind of filter, especially a kind of areflexia co-planar waveguide bandstop filter.
Background technology
Filter is common and important circuit unit, and the frequency response of filter has passband and stopband, in passband, signal
The insertion loss of filtered device is small, and reflection is also small；Big in the insertion loss of stopband, filtered device, signal is typically to be filtered
Wave device reflects so that signal is very big in the frequency range decaying of stopband, to realize stopband function.Therefore common bandstop filter exists
The reflection of stopband is very big, these reflected signals can influence the working condition in filter prime unit.
Invention content
Technical problem:The purpose of the present invention is to propose to a kind of areflexia co-planar waveguide bandstop filter, which is hindering
Not only transmission loss is big for band, but also reflection is small, does not influence prime or the working condition of rear class unit.
Technical solution：A kind of areflexia co-planar waveguide bandstop filter includes medium substrate, co-planar waveguide and multiple resonance
Gap ring；Medium substrate is metal layer on one side, and co-planar waveguide is located at metal layer；Earth plate in the conduction band both sides of co-planar waveguide
On, form uptake zone by multiple resonant slot rings；Resonant slot ring is made of concentric interior gap ring and outer gap ring, interior
Respectively there are one metallic conductor section, the gold of the metallic conductor section of interior gap ring and outer gap ring for gap ring and outer gap ring
Belong to the both sides that conductor segment is in interior gap ring and outer gap ring center；Adjacent resonant slot ring is passed along uniconductor surface wave
The spacing of defeated line transmission direction is greater than the overall diameter of the outer gap ring of resonant slot ring, to reduce energy in uptake zone along list
Conductive surface wave transmission line direction, by the coupling between adjacent resonant slot ring, avoid energy in uptake zone along altogether
The transmission direction transmission that surface wave is led, influences the depth of stopband；Change hanging down with co-planar waveguide transmission direction for adjacent resonant slot ring
Straight spacing can adjust the depth of bandstop filter stopband, and spacing is smaller, and adjacent resonant slot ring is along perpendicular to co-planar waveguide
The coupling ability of transmission direction is stronger, and the absorbability of stop-band filter is stronger, and the depth of stopband is deeper, and the reflection of stopband is also got over
It is small；The stopband center frequency of filter can be adjusted by changing the resonant frequency of resonant slot ring.
Change resonant slot ring in the shape of gap ring and outer gap ring, interior gap ring and outer gap ring week
The metallic conductor section size of long and thickness and interior gap ring and outer gap ring, can adjust areflexia uniconductor surface
The stopband center frequency and bandwidth of rejection of wave transmission line bandstop filter.
The resonant slot number of rings amount for being parallel to coplanar wave guide transmission direction is more, and the absorbability of stop-band filter is stronger,
The depth of stopband is also deeper, and the reflection of stopband is also smaller；Resonant slot number of rings amount perpendicular to coplanar wave guide transmission direction is more,
The absorbability of stop-band filter is stronger, and the depth of stopband is deeper, and the reflection of stopband is also smaller；Uptake zone is closer from conduction band, resistance
The absorbability of band filter is stronger, and the depth of stopband is deeper.
Electromagnetic wave passes after the input of areflexia co-planar waveguide bandstop filter input port along coplanar wave guide transmission direction
It is defeated.Electromagnetic wave can interact in the transmission process towards output end with uptake zone.In the passband of bandstop filter, inhale
It receives area and total reflection characteristic is substantially presented, meet the transverse resonance condition of transmission line pattern；In the stopband of bandstop filter,
One rim portion electromagnetic wave energy can be coupled to uptake zone.In uptake zone, the adjacent resonant slit perpendicular to coplanar wave guide transmission direction
Spacing between gap ring is small, coupling is strong, and the spacing being parallel between the adjacent resonant slot ring in coplanar wave guide transmission direction it is big,
Coupling is very weak, therefore is mainly transmitted along perpendicular to coplanar wave guide transmission direction in uptake zone electromagnetic wave.Due to medium substrate
Loss and metal conductor losses, when the resonant frequency of the frequency approaches resonance gap ring of electromagnetic wave, these perpendicular to altogether
The electromagnetic wave energy that surface wave leads transmission direction transmission is absorbed or is radiated, and to cause the loss of transmission energy, forms band resistance
The stopband of filter.In the outer edge of earth plate, remaining electromagnetic wave energy is reflected back uptake zone, and continuation is inhaled by resonant slot ring
It receives or radiates, then return co-planar waveguide central area, be divided into two-way, all the way towards input terminal, constitute bandstop filter
Standing wave reflects, and another way influences the inhibition of stopband towards output end.Uptake zone will avoid electromagnetic wave from being passed along co-planar waveguide is parallel to
Defeated direction transmission forms standing wave, influences because the electromagnetic wave of this direction transmission can be coupled back the central area of co-planar waveguide
Stopband inhibits, therefore in parallel co-planar waveguide transmission direction, and the spacing of resonant slot ring is appropriate larger.Perpendicular to coplanar wave
The resonant slot number of rings amount for leading transmission direction is more, and bigger, stop-band filter is lost in the electromagnetic wave energy along the transmission of this direction
Absorbability it is stronger, the depth of stopband is deeper, and the reflection of stopband is also smaller.Uptake zone is closer from conduction band, can improve stopband
The absorbability of filter, but the discontinuity of input terminal is also bigger, and the standing wave of filter passband and stopband can be made to increase.
In areflexia co-planar waveguide bandstop filter, the earth plate near co-planar waveguide conduction band has uptake zone；It is inhaling
Area is received, a series of resonant slot ring that head and the tail are adjacent, adjacent spacing is small, adjacent coupled is big has effectively formed a resonant slot
Ring periodic structure transmission line；There is a plurality of such periodic structure transmission line in uptake zone, and one end of these transmission lines is absorbing
Area is close to the region of conduction band, and the other end is away from the region of conduction band；When resonant frequency of the frequency close to resonant slot ring, or
When person is the passband of resonant slot ring periodic structure transmission line, the electromagnetic wave entered from the port that co-planar waveguide inputs passes on one side
It is defeated, it is coupled to resonant slot ring periodic structure transmission line on one side, resonant slot ring periodic structure transmission line can pass on one side
It is defeated to absorb on one side and radiated electromagnetic wave, the thus areflexia stopband of shaping filter；In the band connection frequency of filter, these are humorous
The gap ring that shakes is detuning, and resonant slot ring periodic structure transmission line is equivalent to a reactance, the electromagnetism entered from the port of input
Wave cannot enter resonant slot ring periodic structure transmission line, therefore reflected and cannot be absorbed or radiate by uptake zone, only
The port of the output of filter, the passband of shaping filter can be arrived.
The transmission direction of resonant slot ring periodic structure transmission line can be straight line or curve, can also be humorous from one
The gap ring periodic structure transmission line bifurcated that shakes goes out several resonant slot ring periodic structure transmission lines, as long as these resonant slots
The port of ring periodic structure transmission line avoids electromagnetic wave by means of resonant slot not close to the port of input and the port of output
Ring periodic structure transmission line, from the port transmission of input to the port of output.
It can be filtered for different frequent points by the geometric dimension of adjusting resonant slot ring in design.In general,
Resonant slot ring geometric dimension is the key that control resonant frequency, and size is bigger, and resonant frequency is lower, stopband center frequency point
It is low；On the contrary, size is smaller, resonant frequency is higher, and stopband center frequency point is also high；The shape of resonant slot ring is thick with gap
Thin and gap opening size also influences resonant frequency, and resonant frequency can be changed to control stopband frequency by adjusting these parameters
Rate.
Advantageous effect：The advantageous effect of areflexia co-planar waveguide bandstop filter of the present invention is, can be by stopband signal
It sponges, reduces the standing wave of stopband, so as to improve the performance of system, especially there is important meaning to high-power RF microwave system
Justice.
Description of the drawings
Fig. 1 is areflexia co-planar waveguide band stop filter structure schematic diagram.
Have in figure：Medium substrate 1, co-planar waveguide 2, resonant slot ring 3, uptake zone 4, port 5, metal layer 11, conduction band 21,
The spacing 32 vertical with transmission direction of spacing 31 of earth plate 22, transmission direction.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
A kind of areflexia co-planar waveguide bandstop filter of the present invention includes medium substrate 1, co-planar waveguide 2 and multiple resonance
Gap ring 3；Medium substrate 1 is metal layer 11 on one side, and co-planar waveguide 2 is located at metal layer 11；In 21 liang of the conduction band of co-planar waveguide 2
On the earth plate 22 of side, uptake zone 4 is formed by multiple resonant slot rings 3；Resonant slot ring 3 is by concentric interior gap ring and outside
Gap ring composition, respectively there are one metallic conductor section, the metallic conductor sections of interior gap ring for interior gap ring and outer gap ring
The both sides of interior gap ring and outer gap ring center are in the metallic conductor section of outer gap ring；Adjacent resonant slot ring 3
It is greater than the overall diameter of 3 outer gap ring of resonant slot ring along the spacing 31 of 2 transmission direction of uniconductor surface wave transmission line, with
Reduce energy uptake zone 4 along 2 transmission direction of uniconductor surface wave transmission line, pass through the coupling between adjacent resonant slot ring 3
It closes, avoids energy from being transmitted along the transmission direction of co-planar waveguide 2 in uptake zone 4, influence the depth of stopband；Change adjacent resonant slit
The spacing 32 vertical with 2 transmission direction of co-planar waveguide of gap ring 3, can adjust the depth of bandstop filter stopband, and spacing is smaller,
Adjacent resonant slot ring 3 is stronger along the coupling ability perpendicular to 2 transmission direction of co-planar waveguide, and the absorbability of stop-band filter is got over
By force, the depth of stopband is deeper, and the reflection of stopband is also smaller；Filter can be adjusted by changing the resonant frequency of resonant slot ring 3
Stopband center frequency.
Change the shape of gap ring and outer gap ring in resonant slot ring 3, interior gap ring and outer gap ring
The metallic conductor section size of perimeter and thickness and interior gap ring and outer gap ring, can adjust areflexia uniconductor table
The stopband center frequency and bandwidth of rejection of surface wave transmission line bandstop filter.
3 quantity of resonant slot ring for being parallel to 2 transmission direction of co-planar waveguide is more, and the absorbability of stop-band filter is got over
By force, the depth of stopband is also deeper, and the reflection of stopband is also smaller；Perpendicular to 3 quantity of resonant slot ring of 2 transmission direction of co-planar waveguide
More, the absorbability of stop-band filter is stronger, and the depth of stopband is deeper, and the reflection of stopband is also smaller；Uptake zone 4 is from conduction band 21
Closer, the absorbability of stop-band filter is stronger, and the depth of stopband is deeper.Medium substrate 1 posts the epoxy of copper foil using surface
Resin plate.
Electromagnetic wave is after the input of areflexia co-planar waveguide bandstop filter a port 5, along 2 transmission direction of co-planar waveguide
Transmission.Electromagnetic wave can interact in the transmission process towards another port 6 of bandstop filter with uptake zone 4.In band
The passband of filter is hindered, uptake zone 4 is substantially presented total reflection characteristic, meets the transverse resonance condition of transmission line pattern；
In the stopband of bandstop filter, a rim portion electromagnetic wave energy can be coupled to uptake zone 4.In uptake zone 4, perpendicular to co-planar waveguide
Spacing 32 between the adjacent resonant slot ring 3 of 2 transmission directions is small, coupling is strong, and is parallel to the phase of 2 transmission direction of co-planar waveguide
Spacing 31 between adjacent resonant slot ring 3 is big, coupling is very weak, therefore in 4 electromagnetic wave of uptake zone mainly along perpendicular to coplanar
2 transmission direction of waveguide is transmitted.Due to the loss of medium substrate 1 and the conductor losses of metal, when the frequency approaches resonance of electromagnetic wave
When the resonant frequency of gap ring 3, these are absorbed perpendicular to the electromagnetic wave energy of 2 transmission direction of co-planar waveguide transmission or spoke
It penetrates, to cause the loss of transmission energy, forms the stopband of bandstop filter.In the outer edge of earth plate 22, remaining electromagnetism
Wave energy is reflected back uptake zone 4, continues to be absorbed by resonant slot ring 3 or radiated, then returns co-planar waveguide 2, be divided into two
Road constitutes the standing wave reflection of bandstop filter all the way towards the port of input 5, and another way influences stopband towards the port 5 of output
Inhibit.Uptake zone 4 will avoid electromagnetic wave along the transmission of 2 transmission direction of co-planar waveguide is parallel to, because of the electricity of this direction transmission
Magnetic wave can be coupled back the central area 23 of co-planar waveguide 2, form standing wave, influence stopband inhibition, therefore in parallel co-planar waveguide 2
The spacing 31 of transmission direction, resonant slot ring 3 is appropriate larger.Perpendicular to the resonant slot ring 3 of 2 transmission direction of co-planar waveguide
Quantity is more, and the electromagnetic wave energy loss along the transmission of this direction is bigger, and the absorbability of stop-band filter is stronger, the depth of stopband
Degree is deeper, and the reflection of stopband is also smaller.Uptake zone 4 is closer from conduction band 21, can improve the absorbability of stop-band filter, but not
Continuity is also bigger, and the standing wave of filter passband and stopband can be made to increase.
In areflexia co-planar waveguide bandstop filter, the earth plate 22 near co-planar waveguide conduction band 21 has uptake zone 4；
In uptake zone 4, a series of head and the tail are adjacent, adjacent spacing is small, adjacent coupled is big resonant slot ring 3 effectively formed one it is humorous
Shake gap ring periodic structure transmission line；There are a plurality of such periodic structure transmission line, one end of these transmission lines in uptake zone 4
In uptake zone 4 close to the region of conduction band 21, the other end is away from the region of conduction band 21；When frequency is close to resonant slot ring 3
When resonant frequency or when the passband of resonant slot ring periodic structure transmission line, enter from the port 5 that co-planar waveguide inputs
Electromagnetic wave transmit on one side, be coupled to 3 periodic structure transmission line of resonant slot ring, 3 periodic structure of resonant slot ring on one side
Transmission line can be absorbed while transmitting and radiated electromagnetic wave, thus the areflexia stopband of shaping filter；In filter
Band connection frequency, these resonant slot rings 3 are detuning, and 3 periodic structure transmission line of resonant slot ring is equivalent to a reactance, from defeated
The electromagnetic wave that the port 5 that enters enters cannot enter resonant slot ring periodic structure transmission line, thus by uptake zone reflection without
It can be absorbed or be radiated, the port 5 of the output of filter, the passband of shaping filter can only be arrived.
The transmission direction of 3 periodic structure transmission line of resonant slot ring can be straight line or curve, can also be from one
3 periodic structure transmission line bifurcated of resonant slot ring goes out several 3 periodic structure transmission lines of resonant slot ring；Every resonant slot
In two ports of 3 periodic structure transmission line of ring, it can only be located at there are one port in uptake zone 4 close to the region of conduction band 21,
Cannot two ports be all located at the region in uptake zone 4 close to conduction band 21, can not a port be located in uptake zone 4 close lead
With 21 region, another port is close to the port 5 of input or the port 5 of output, in this way it is avoided that electromagnetic wave is by means of humorous
Shake 3 periodic structure transmission line of gap ring, and the port 5 of output is transferred to from the port of input 5.
Uptake zone 4 can only can also be led in co-planar waveguide 2 in the earth plate 22 of 21 both sides of conduction band of co-planar waveguide 2
In an earth plate 22 with 21 sides.In technique, common print had both may be used in areflexia co-planar waveguide bandstop filter
Printed circuit board (PCB) technique can also use low-temperature co-fired ceramics (LTCC) technique or integrated circuit technology to realize.
According to the above, the present invention can be realized.
Claims (5)
1. a kind of areflexia co-planar waveguide bandstop filter, it is characterised in that the areflexia co-planar waveguide bandstop filter includes being situated between
Matter substrate (1), co-planar waveguide (2) and multiple resonant slot rings (3)；Medium substrate (1) is metal layer (11), coplanar wave on one side
It leads (2) and is located at metal layer (11)；On the earth plate (22) of conduction band (21) both sides of co-planar waveguide (2), by multiple resonant slots
Ring (3) forms uptake zone (4)；Adjacent resonant slot ring (3) along uniconductor surface wave transmission line (2) transmission direction spacing
(31) it is greater than the overall diameter of the outer gap ring of resonant slot ring (3), to reduce energy in uptake zone (4) along uniconductor surface
Wave transmission line (2) transmission direction, by the coupling between adjacent resonant slot ring (3), avoid energy in uptake zone (4) along altogether
Surface wave leads the transmission direction transmission of (2), influences the depth of stopband；Change being passed with co-planar waveguide (2) for adjacent resonant slot ring (3)
The vertical spacing in defeated direction (32), can adjust the depth of bandstop filter stopband, and spacing is smaller, adjacent resonant slot ring (3)
Stronger along the coupling ability perpendicular to co-planar waveguide (2) transmission direction, the absorbability of stop-band filter is stronger, the depth of stopband
Deeper, the reflection of stopband is also smaller；The stopband center frequency of filter can be adjusted by changing the resonant frequency of resonant slot ring (3)
Rate.
2. a kind of areflexia co-planar waveguide bandstop filter according to claim 1, it is characterised in that the resonant slot
Ring (3) quantity is more, and the absorbability of stop-band filter is stronger, and the depth of stopband is also deeper, and the reflection of stopband is also smaller；Vertically
More in resonant slot ring (3) quantity of co-planar waveguide (2) transmission direction, the absorbability of stop-band filter is stronger, stopband
Depth is deeper, and the reflection of stopband is also smaller；Uptake zone (4) is closer from conduction band (21), and the absorbability of stop-band filter is stronger, resistance
The depth of band is deeper.
3. a kind of areflexia co-planar waveguide bandstop filter according to claim 1, it is characterised in that the resonant slot
Ring (3) is made of concentric interior gap ring and outer gap ring, and interior gap ring and outer gap ring are respectively led there are one metal
Body section, the metallic conductor section of interior gap ring and the metallic conductor section of outer gap ring are in interior gap ring and outer gap ring
The both sides in the center of circle.
4. a kind of areflexia co-planar waveguide bandstop filter according to claim 3, it is characterised in that the resonant slot
Ring (3), change in the shape of gap ring and outer gap ring, the perimeter of interior gap ring and outer gap ring and thickness, with
And the metallic conductor section size of interior gap ring and outer gap ring, the resistance filter of areflexia uniconductor surface wave transmission tape can be adjusted
The stopband center frequency and bandwidth of rejection of wave device.
5. a kind of areflexia co-planar waveguide bandstop filter according to claim 1, it is characterised in that the medium substrate
(1) surface is used to post the epoxy resin board of copper foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810133896.9A CN108417937B (en) | 2018-02-07 | 2018-02-07 | Reflection-free coplanar waveguide band-stop filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810133896.9A CN108417937B (en) | 2018-02-07 | 2018-02-07 | Reflection-free coplanar waveguide band-stop filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108417937A true CN108417937A (en) | 2018-08-17 |
| CN108417937B CN108417937B (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810133896.9A Expired - Fee Related CN108417937B (en) | 2018-02-07 | 2018-02-07 | Reflection-free coplanar waveguide band-stop filter |
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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 |
-
2018
- 2018-02-07 CN CN201810133896.9A patent/CN108417937B/en not_active Expired - Fee Related
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 (3)
| Title |
|---|
| J.-M. HUANG ET AL.: "Broadband Bandstop Filters using Periodic Fractal EBG Structures on CPW Transmission Line", 《DTIP 2009 OF MEMS&MOEMS》 * |
| M.F. KARIM ET AL.: "CPW band-stop filter using unloaded and loaded EBG structures", 《IEEE PROCEEDING MICROWAVE ANTENNAS PROPAGATION》 * |
| SHAH NAWAZ BUROKUR ET AL.: "Phenomenon study of a microstrip line on a Slot Split Ring Resonators defected ground plane", 《2005 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM》 * |
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| CN108417937B (en) | 2020-06-02 |
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