CN105703041A - Artificial surface plasmon-based miniaturized low-pass filter - Google Patents
Artificial surface plasmon-based miniaturized low-pass filter Download PDFInfo
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- CN105703041A CN105703041A CN201610184142.7A CN201610184142A CN105703041A CN 105703041 A CN105703041 A CN 105703041A CN 201610184142 A CN201610184142 A CN 201610184142A CN 105703041 A CN105703041 A CN 105703041A
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- artificial surface
- pass filter
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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
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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 an artificial surface plasmon-based miniaturized low-pass filter. The artificial surface plasmon-based miniaturized low-pass filter is characterized by mainly comprising a coplanar waveguide, wherein two ground strips of the coplanar waveguide are provided with groove unit arrays which are periodically distributed along the length direction of the coplanar waveguide; the two groove unit arrays are longitudinally symmetric about a center conductor strip; the depths of groove units are uniformly and progressively increased from two sides to the middle part in the length direction of the coplanar waveguide; and the depth of the groove unit in the middle part is fixed. On the basis of the coplanar waveguide, an artificial surface plasma structure is constructed by etching the periodic groove units on the ground strips by the coplanar waveguide to achieve the filtering function. T-shaped grooves are introduced; and equivalent depths of the grooves in the width direction are increased, so that the device miniaturization is achieved. The artificial surface plasmon-based miniaturized low-pass filter has a series of advantages of being simple in structure, compact in size, good in filter performance, easy to process, suitable for being matched with a traditional microwave transmission line and the device for use and the like.
Description
Technical field
The present invention relates to a kind of wave filter, particularly relate to a kind of miniaturization low pass filter based on artificial surface phasmon。
Background technology
Surface phasmon (SurfacePlasmonPolaritons, be called for short SPPs) is a kind of light frequency inherence metal with on medium (usually air) interface transmission a kind of special electromagnetic wave。SPPs is a kind of surface wave, has feature two kinds distinct: one, is a kind of evanescent waves along being perpendicular to interface, and the intensity of ripple exponentially reduces, and therefore ripple is bound near interface；Secondly, the transmission wavelength of SPPs is shorter, and therefore it can break through diffraction limit。Research for SPPs had once once been limited in optical band or higher frequency。The plasma frequency of metal is generally all in ultraviolet band, and metal is very big at the dielectric constant of low-frequency range so that electromagnetic skin depth is only small, so, in low-frequency range, metal is similar to perfact conductor (PerfectElectricConductor is called for short PEC)。So that SPPs retrains very poor in the field of metal surface, it is impossible to realize there is effect spread on the metal surface, greatly limit the SPPs application in low-frequency range。Good characteristic due to SPPs, if by the concept of surface plasmons to low-frequency range (microwave or terahertz wave band), contribute to obtaining the guided wave technology of high binding microwave or terahertz signal, and it is highly integrated to realize that the device size of low-frequency range is reduced to sub-wavelength magnitude。In order to realize in low-frequency range, the efficient of ripple being retrained, a kind of on metal the method for etching groove or borehole be suggested, owing to it inherits the relevant nature of SPPs, it is referred to as artificial surface phasmon (SpoofSurfacePlasmonPolaritons is called for short SSPPs)。Its basic thought is the hole digging period profile in metal surface, and size and the interval of hole are much smaller than wavelength, to strengthen electromagnetic osmosis, reduces the plasma frequency of metal surface thereby through the means of effective medium。This method can pass through the transmission of the physical dimension control ripple of structure, has very big potentiality in microwave Terahertz designs。2005, Hibbins et al. confirmed SSPPs phenomenon in microwave section, and subsequently, Williams et al. also demonstrates the existence of SSPPs at terahertz wave band, and new page has been opened in development and application for low frequency SPPs。SSPPs causes the great interest of researcher since then。
Recently, some have many achievements to see each big periodical for the research of the transmission of SpoofSPPs。In these researchs, major part is all passive structure or device, and these devices can not individually complete work, because the transmission of feed efficiency and signal is had certain difficulty by this。Generally, these designs need to combine with microwave Terahertz circuit or device。Therefore, the converting transmission efficiency of guided wave and spp ripple is particularly important。Being devoted to the efficiency that transmission converts, for prism, grating, the research of domino array etc. obtains some achievements successively。But not the mating of wave vector result in transmission conversion efficiency can not reach desirable。In consideration of it, the structure of a kind of gradual change type is suggested to solve the problem that wave vector does not match that with impedance。Secondly, the miniaturization of microwave device is a problem that not can bypass, and plays important function in microwave circuit system designs。British scholar proposes a kind of structure by square bending convolution metal band and realizes the increase of metal minor matters equivalent length, and miniaturization has been done further application by rear Shanghai University Zhou Yongjin。
Co-planar waveguide, as a kind of superior performance, microwave planar transmission line easy to process, is just played a greater and greater role in monolithic integrated microwave circuit, has especially been arrived millimeter wave frequency band, and co-planar waveguide more has the performance advantage that microstrip line is incomparable。Compared with conventional microstrip transmission line, co-planar waveguide has easy making, it is easy to realize series connection passive, that active device is in microwave circuit and parallel connection (need not bore a hole on substrate), it is easy to improve the advantages such as current densities。
Summary of the invention
It is an object of the invention to be combined the artificial surface plasma waveguide supporting SSPPs with the co-planar waveguide supporting space wave, design a kind of miniaturization low pass filter based on artificial surface phasmon。
The technical scheme is that and be achieved in that:
A kind of miniaturization low pass filter based on artificial surface phasmon, it is characterized in that mainly being made up of co-planar waveguide, two counterpoise groundings of co-planar waveguide are respectively arranged with the groove cell array along co-planar waveguide length direction periodic distribution, between two groove cell arrays symmetrical above and below about center conductor band, groove unit depth is at co-planar waveguide length direction by two lateral middle part uniform increments, and the groove unit depth at middle part is constant。
The present invention is on the basis of co-planar waveguide, utilizes co-planar waveguide etching period groove unit on counterpoise grounding to construct artificial surface plasmon structures to realize filter function。
Further, the present invention have also been devised the groove unit of T-shaped structure, is used for increasing the groove unit equivalent depth at co-planar waveguide width, thus realizing the miniaturization of device further。
For the SSPPs propagated on the co-planar waveguide having periodically sub-wavelength rectangular recess array, different groove depth has different dispersion curves, and the wave vector of different degree of depth grooves is different, can realize mating of wave vector and impedance by the gradual change of groove depth；Furthermore, owing to the plasma frequency of SSPPs is controlled by surface geometry, so artificial surface plasma waveguide has adjustable chromatic dispersion characteristic；Some unit of the middle part degree of depth constant part that the present invention can pass through groove cell array control final cut-off frequency, it is achieved that the function of controlled filtering。The design of T-slot adds the groove unit equivalent depth at co-planar waveguide width, it is achieved that the more miniaturization of wave filter physical dimension。
The present invention is suitable for mating use with traditional microwave transmission line, designs and apply a kind of brand-new thinking of offer and scheme for filtering device。
There is advantages that
1. the present invention mainly proposes a kind of miniaturization low pass filter based on artificial surface phasmon, utilize the superior transmission performance of co-planar waveguide on the one hand, utilize the adjustable chromatic dispersion characteristic of artificial surface plasma waveguide on the other hand, it is achieved that the low-pass filter effect of signal transmission。This structure can connect with microwave device or Circuit Matching, and then has greater flexibility in the design of microwave device and integrated circuit structure,
2. simple in construction: structure comes from co-planar waveguide, and wave vector is made up of co-planar waveguide etching period groove array on the ground with impedance matching section and SSPPs transmission, and simple structure is compact, convenient processing。
3. strong innovation, technology is perspective good: the present invention utilizes the combination of artificial surface plasma waveguide and co-planar waveguide at microwave frequency band, it is achieved that low-frequency filter characteristics, strong innovation；It can well and traditional microwave transmission line with the use of, it is simple to be integrated in microwave circuit, expanded the range of application of artificial surface plasma device, there is good technology perspective。
4. filtering performance is strong: filtering performance comes from the isoionic transmission characteristic of artificial surface, and Out-of-band rejection is notable, and in band, transmission performance is good。
5. achieve the Miniaturization Design of device: by introducing T-shaped structure grooves, increase the equivalent depth of groove, it is achieved at the miniaturization of the length being perpendicular on transmission direction。
Accompanying drawing illustrates:
Fig. 1 is the dispersion element structure three-dimensional schematic diagram of embodiment one；
Fig. 2 is the dispersion curve figure of the difference groove depth of dispersion element structure shown in Fig. 1；
Fig. 3 is the overall structure schematic three dimensional views of embodiment one；
Fig. 4 is the groove array detailed structure figure of embodiment one；
Fig. 5 is the S parameter of embodiment one correspondence；
Fig. 6 is the overall structure schematic three dimensional views of embodiment two；
Fig. 7 is the groove array detailed structure figure of embodiment two；
Fig. 8 is the S parameter of embodiment two correspondence。
Detailed description of the invention:
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail:
Embodiment one
As shown in Figure 3, present configuration is based on co-planar waveguide, two metallic ground band is etched with the rectangular configuration groove cell array along co-planar waveguide length direction (x direction) periodic distribution, groove cell array is symmetrical about co-planar waveguide width (y direction), symmetrical above and below about center conductor band between two groove cell arrays。Groove unit depth (i.e. the height in y direction) is constituted pattern match section in x direction by two lateral middle part uniform increments, the groove unit depth at middle part is constant constitutes the constant groove element number of SSPPs span line, the groove element number of both sides degree of depth gradual change and the middle part degree of depth according to the setting of guided wave signals transmission requirement。
The medium substrate of wave filter is Rogers 6010 (dielectric constant is 10.2), Fig. 1 is the cycle dispersion element structure comprising rectangular channel unit in embodiment one, length (i.e. groove cell distribution cycle) is p=4mm, width is W=20mm, dielectric substrate thickness a=1.0mm, metal layer thickness t=0.018mm, the width b=0.5mm of rectangular channel, depth variable is h。Utilize electromagnetic simulation software that the cycle dispersion element structure of Fig. 1 is emulated, the dispersion result under variable h uniformly increases from 1.0mm to 5.0mm can be obtained as shown in Figure 2。It is associated by the degree of depth being distributed known asymptotic frequency and groove of curve, and along with the asymptotic frequency of the increase of groove depth reduces。
The overall structure of low pass filter is illustrated as it is shown on figure 3, the length of structure is L=100mm, and width is W=20mm, dielectric substrate thickness a=1.0mm, metal layer thickness t=0.018mm。
As shown in Figure 4, co-planar waveguide holding wire width w1=3mm, interval g=0.8mm between holding wire and ground, in order to build the impedance of port 50ohm。The width of the present embodiment rectangular channel unit is b=0.5mm, along x direction by period p=4mm distribution。Groove depth uniformly increases from h1=0.8mm to h6=4.8mm from two ends to the middle part degree of depth, and the degree of depth of middle 7 groove unit is 4.8mm。
According to embodiment one, utilize electromagnetic simulation software can obtain S parameter result as shown in Figure 5。0 to about 5.5GHz electromagnetic wave can high efficiency of transmission, form effective cut-off at 5.5GHz place, be with outer S21 at below-40dB, be with interior S11 substantially at below-10dB。
Embodiment two
As shown in Figure 6, consistent with embodiment one basic structure, it is distinctive in that the groove unit of the present embodiment adopts T-type structure, integrally-built length is L=100mm, and width is W=20mm, dielectric substrate thickness a=1.0mm, metal layer thickness t=0.018mm。
As it is shown in fig. 7, co-planar waveguide holding wire width w1=3mm, interval g=0.8mm between holding wire and ground, in order to build the impedance of port 50ohm。The horizontal minor matters of the present embodiment T-slot unit and vertical minor matters width are equal to b=0.5mm, and horizontal minor matters and vertical minor matters width can also be unequal, arrange according to guided wave signals transmission requirement, along x direction by period p=4mm distribution。The T-slot unit constant perseverance of minor matters length in x direction is q=2.5mm, and the degree of depth uniformly increases from h1=0.5mm to h6=3.0mm, and the degree of depth of middle 7 groove unit is 3.0mm。
According to embodiment two, utilize electromagnetic simulation software can obtain S parameter result as shown in Figure 8。0 to about 5.5GHz electromagnetic wave can high efficiency of transmission, form effective cut-off at 5.5GHz place, be with outer S21 at below-35dB, be with interior S11 at below-15dB。
In above-described embodiment, groove cell array is symmetrical, in actual applications, it is also possible to be set to asymmetric situation。In above-described embodiment, any one end of wave filter all can as the input of guided wave signals, and the other end is correspondingly as outfan。
The wave filter of the T-slot structure designed by the present invention, reaching the cut-off of the 5.5GH in result needs the y direction minor matters length of T-slot to be 3mm, and the transmission in passband meets high efficiency requirement。And to be reached same cut-off frequency (being about the asymptotic frequency of dispersion curve) by the dispersion curve of Fig. 2 is known T-slot is changed to the degree of depth of its groove of rectangle to reach about 4.8mm。Its reason is in that the transversary of T-slot is equivalent to the equivalent depth adding groove in y direction, and the severity control of the asymptotic frequency groove of the dispersion curve of SSPP structure, the more deep asymptotic frequency of groove is more little。So achieving the miniaturization in y direction。
When dielectric board material changes, if dielectric constant diminishes, then the restraint performance of electromagnetic energy is weakened by dielectric-slab, causes that the cut-off frequency of wave filter increases。This situation adopts T-slot structure, the equally possible purpose reducing frequency and device miniaturization。
Claims (5)
1. the miniaturization low pass filter based on artificial surface phasmon, it is characterized in that mainly being made up of co-planar waveguide, two counterpoise groundings of co-planar waveguide are respectively arranged with the groove cell array along co-planar waveguide length direction periodic distribution, between two groove cell arrays symmetrical above and below about center conductor band, groove unit depth is at co-planar waveguide length direction by two lateral middle part uniform increments, and the groove unit depth at middle part is constant。
2. a kind of miniaturization low pass filter based on artificial surface phasmon according to claim 1, it is characterised in that: described groove unit is in rectangular configuration。
3. a kind of miniaturization low pass filter based on artificial surface phasmon according to claim 1, it is characterised in that: the described T-shaped structure of groove unit。
4. a kind of low pass filter based on artificial surface phasmon miniaturization according to claim 1, it is characterised in that: groove cell array is symmetrical about co-planar waveguide width。
5. a kind of low pass filter based on artificial surface phasmon miniaturization according to claim 1, it is characterised in that: any one end of wave filter is as the input of guided wave signals, and the other end is as outfan。
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Cited By (6)
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| CN106935947A (en) * | 2017-04-12 | 2017-07-07 | 南京航空航天大学 | The tunneling effect and its method of work of artificial surface plasmon |
| CN109244609A (en) * | 2018-09-11 | 2019-01-18 | 区庆元 | A kind of square groove structure microwave filter with dual band operation characteristic |
| CN109904575A (en) * | 2019-03-07 | 2019-06-18 | 南京邮电大学 | A kind of artificial surface plasmon transmission line based on Delta Stubs structure |
| CN110137639A (en) * | 2019-05-17 | 2019-08-16 | 厦门大学 | A kind of miniaturization variable band-pass filter based on artificial surface phasmon |
| CN111370820A (en) * | 2020-03-20 | 2020-07-03 | 厦门大学 | Adjustable band elimination filter based on artificial surface plasmon |
| CN114883767A (en) * | 2022-05-25 | 2022-08-09 | 厦门大学 | Low-pass rectangular waveguide with band-stop characteristic and internally inserted with SSPP material |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106935947A (en) * | 2017-04-12 | 2017-07-07 | 南京航空航天大学 | The tunneling effect and its method of work of artificial surface plasmon |
| CN109244609A (en) * | 2018-09-11 | 2019-01-18 | 区庆元 | A kind of square groove structure microwave filter with dual band operation characteristic |
| CN109244609B (en) * | 2018-09-11 | 2019-10-29 | 区庆元 | A kind of square groove structure microwave filter with dual band operation characteristic |
| CN109904575A (en) * | 2019-03-07 | 2019-06-18 | 南京邮电大学 | A kind of artificial surface plasmon transmission line based on Delta Stubs structure |
| CN109904575B (en) * | 2019-03-07 | 2022-01-07 | 南京邮电大学 | Artificial surface plasmon transmission line based on Delta Stubs structure |
| CN110137639A (en) * | 2019-05-17 | 2019-08-16 | 厦门大学 | A kind of miniaturization variable band-pass filter based on artificial surface phasmon |
| CN111370820A (en) * | 2020-03-20 | 2020-07-03 | 厦门大学 | Adjustable band elimination filter based on artificial surface plasmon |
| CN111370820B (en) * | 2020-03-20 | 2021-05-25 | 厦门大学 | Adjustable band elimination filter based on artificial surface plasmon |
| CN114883767A (en) * | 2022-05-25 | 2022-08-09 | 厦门大学 | Low-pass rectangular waveguide with band-stop characteristic and internally inserted with SSPP material |
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