CN100566147C - Can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs - Google Patents
Can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs Download PDFInfo
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- CN100566147C CN100566147C CNB2007100407465A CN200710040746A CN100566147C CN 100566147 C CN100566147 C CN 100566147C CN B2007100407465 A CNB2007100407465 A CN B2007100407465A CN 200710040746 A CN200710040746 A CN 200710040746A CN 100566147 C CN100566147 C CN 100566147C
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Abstract
A kind of communication technical field can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs, comprising: front portion, reverse side part and input output port.The front portion comprises: interdigital capacitor unit, T type stub unit, through-hole unit, uniform transmission line unit and dielectric-slab.The interdigital capacitor unit has two, links to each other by a T type stub unit between two interdigital capacitor unit.The input output port have two, each port links to each other with a uniform transmission line unit.Reverse side partly comprises: unit, non-homogeneous defective ground, H groove part gap structure unit and ground unit, and unit, non-homogeneous defective ground has six, and the overall dimension of each unit is with the non-homogeneous arrangement of arithmetic progression, totally two of H groove part gap structure unit.The present invention adopts the mode of slotting on uniform transmission line to reduce the face knot of circuit.
Description
Technical field
What the present invention relates to is a kind of filter of communication technical field, specifically is a kind of small wide-frequency filter that can suppress the interference of wireless LAN communication signal.
Background technology
Along with the development of indoor high-speed wireless data access technology, require following wireless communication system to have bigger data throughout than existing system.Therefore, as a kind of effective short-distance wireless access technology, ultra broadband (UWB) technology obtains paying attention to day by day.Propose to distribute the needs of 3.1～10.6GHz frequency range to the ultra-wideband communications use at IEEE 802.15.3a standard, ultra-wide band filter becomes one of research focus as one of passive device crucial in the wireless communication system.Require to be operated in the frequency band of the so non-constant width of 3.1～10.6GHz for the UWB filter, require this filter must have smaller size simultaneously, so that can be integrated with other circuit, and the method for designing of traditional uniform transmission line Coupled Miccrostrip Lines can't be designed so wide band filter.And the standard IEEE 802.11a of wireless LAN communication (WLAN) with 5.15-5.35GHz and these two frequency ranges of 5.470-5.725GHz (or 5.725-5.825GHz) all as its working frequency range, under the situation that two kinds of systems all exist, may form communication and disturb, therefore be necessary to design a kind of small wide-frequency filter that can suppress the interference of wireless LAN communication signal.
Find through literature search prior art, in February, 2007, people such as Hussein Shaman was at IEEEMicrowave and Wireless Components Letters (microwave and wireless devices wall bulletin), 17 the 3rd phases of volume were delivered " Ultra-wideband (UWB) bandpass filter with embedded bandnotch structures (ultra wide band bandpass filter of built-in stopband) ", in this article, proposed to utilize the stub that opens circuit to realize the band pass filter of high-order, and realized band resistance characteristic with open-circuit line.But the Insertion Loss of the filter in the document is bigger, and the area of entire circuit is also bigger.Also find in the retrieval, in August, 2006, people such as Sheng Sun was at IEEE Microwave and Wireless Components Letters, (microwave and wireless devices wall bulletin) delivered " Capacitive-endedinterdigital coupled lines for UWB bandpass filters with improvedout-of-band performances (the slotting coupled transmission line that refers to of termination capacitive is realized the ultra wide band bandpass filter to the high-band external characteristic) " on the 16th the 8th phase of volume, the slotting finger coupled transmission line that has proposed different geometries in this article designs ultra-wide band filter, but the filter in this article can only reach frequency about 16GHz to the filtering of the outer high-frequency signal of transmission passband, also has some problems in actual use.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and defective, provide a kind of and can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs, make it can solve that existing microstrip filter frequency band is narrow, size is big, the frequency outer high-frequency signal filtering of passband is lower.The present invention covers the such frequency band than broad of 3.0-10.8GHz, can reach the frequency of 20GHz to the filtering of the outer high-frequency signal of transmission passband, the signal of IEEE 802.11a standard bands that can suppress wireless LAN communication is to the small wide-frequency filter of the band interference of IEEE 802.15.3a standard, and its structure mainly is that the cascade by band pass filter and band stop filter constitutes.
The present invention is achieved by the following technical solutions, the present invention includes: front portion, reverse side part and input output port.
Described front portion comprises: interdigital capacitor unit, T type stub unit, through-hole unit, uniform transmission line unit, H type line of rabbet joint unit and dielectric-slab.The interdigital capacitor unit has two, and wherein an end of first interdigital capacitor unit links to each other with uniform transmission line, and the other end links to each other with T type stub.One end of second interdigital capacitor unit links to each other with T type stub, and the other end and H type line of rabbet joint unit link to each other.T type stub unit has one, and the two ends of T type stub unit are connected to the first and second interdigital capacitor unit, and the 3rd end connects through-hole unit.Through-hole unit has one, connects T type stub unit and is positioned at reverse side ground unit partly.
Described input output port have two, each port links to each other with a uniform transmission line unit respectively.
Described reverse side partly comprises: non-homogeneous DGS (defective ground) unit, H type slot (slit) construction unit and ground unit.Unit, non-homogeneous defective ground has six, and the overall dimension of each unit is with the non-homogeneous arrangement of arithmetic progression.H groove part gap structure unit has two, and with the center symmetric arrays.Above-mentioned six non-homogeneous defective unit, ground and two H groove part gap structure unit all are that etching is removed the corresponding structure shape on ground unit, thereby form corresponding air element.
Described interdigital capacitor unit is positioned at the circuit board front, have two interdigital capacitor unit, the ratio of the finger of each interdigital capacitor unit is 2: 1, promptly connect two ends inputs the output port unit be 2 fingers, T type stub unit is 1 finger in the middle of connecting.Spacing between finger is 0.22mm, and two interdigital capacitor unit are symmetrically distributed with the center.The uniform transmission line unit that connects first interdigital capacitor, one end is 50 Ω uniform transmission lines, is connected by T type stub unit between two interdigital capacitor unit, and in the connection of the second interdigital capacitor other end is H type line of rabbet joint unit.
Described H type line of rabbet joint unit is positioned at the dielectric-slab front, and it goes corresponding H type groove to realize that the one end connects the second interdigital capacitor unit by etching on second uniform transmission line unit, and the other end connects the uniform transmission line unit.
Unit, described six non-homogeneous defective ground, the part of the head at two ends, its dumbbell shape non-homogeneous defective ground is positioned at the below of T type stub unit and two interdigital capacitor unit.The non-homogeneous defective of dumbbell shape ground cell array structure is the non-homogeneous arrangement that is arithmetic progression.
Described two H groove part gap structure unit lay respectively at the below of first and second interdigital capacitors.
Described two interdigital capacitor unit, T type stub unit, two uniform transmission line unit, through-hole unit and ground unit are conductor, unit, six non-homogeneous defective ground, two H groove part gap structure unit are to be etched away corresponding shape on ground unit, thereby form the air element structure, H type line of rabbet joint unit is to be etched away corresponding shape on second uniform transmission line unit, thereby forms line of rabbet joint cellular construction.
Described dielectric-slab is the low-k material, and its dielectric constant is 2.65.
The present invention is by realizing low pass filter by the unit, non-homogeneous defective ground at the back side, high pass filter is realized in interdigital capacitor unit and T type stub unit by the front, theoretically as long as regulate the band pass filter that the cut-off frequency of the cut-off frequency of low pass filter and high pass filter can be realized any bandwidth within the specific limits respectively, this circuit has the characteristics of compact conformation, helps integrated with other radio frequency (RF) circuit.And what the present invention adopted is higher order high pass filters, adopts to see in low frequency part after this structure very narrowly to the transition band of passband by cut-off frequency from frequency characteristic, has reduced the squareness factor of this ultra-wide band filter.Owing to adopted H type slot line structure to realize band resistance characteristic, can successfully suppress the interference signal of the standard IEEE 802.11a of wireless LAN communication simultaneously.
Description of drawings
Fig. 1 is the overall structural representation of ultra-wide band filter of the present invention
Fig. 2 is the Facad structure schematic diagram of ultra-wide band filter of the present invention
Fig. 3 is the reverse side structural representation of ultra-wide band filter of the present invention
Fig. 4 is the frequency characteristic schematic diagram of ultra-wide band filter emulation of the present invention
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: front portion, reverse side part and input output port, input output port partly be connected with reverse side with the front portion respectively.Wherein front portion and input the signal of output port is connected, reverse side partly is connected with ground.
The input output port have two, be respectively first the input output port 1 and second the input output port 9.
As shown in Figure 2, the described front portion of present embodiment comprises: the first uniform transmission line unit 2, the second uniform transmission line unit 8, the first interdigital capacitor unit 3, the second interdigital capacitor unit 6, T type stub unit 4, through-hole unit 5, H type line of rabbet joint unit 7, dielectric-slab 10.The input output port have two, first input output port 1 and the first uniform transmission line unit 2 join, second input output port 9 and the second uniform transmission line unit 8 join, the first interdigital capacitor unit 3 is connected by T type stub unit 4 with the second interdigital capacitor unit 6.One end of the first interdigital capacitor unit 3 links to each other with the first uniform transmission line unit 2, and the other end links to each other with T type stub unit 4.One end of the second interdigital capacitor unit 6 links to each other with T type stub unit 4, and the other end links to each other with H type line of rabbet joint unit 7.Through-hole unit 5 has one, connects T type stub unit 4 and is positioned at reverse side ground unit 19 partly.Dielectric-slab 10 is to play a supportive role, and is the first uniform transmission line unit 2, the second uniform transmission line unit 8, the first interdigital capacitor unit 3, the second interdigital capacitor unit 6, T type stub unit 4, H type line of rabbet joint unit 7 on the one side of dielectric-slab 10.On the another side of dielectric-slab 10 unit 17, the 16, the 6th non-homogeneous defective ground, unit, the 15, the 5th non-homogeneous defective ground, unit, the 14, the 4th non-homogeneous defective ground, unit, the 13, the 3rd non-homogeneous defective ground, unit, 12, the second non-homogeneous defective ground, unit, the first non-homogeneous defective ground, a H groove part gap structure unit 11, the 2nd H groove part gap structure unit 18 and ground unit 19.Through-hole unit 5 is passed dielectric-slab 10.
As shown in Figure 3, the described reverse side of present embodiment partly comprises: unit 17, the 16, the 6th non-homogeneous defective ground, unit, the 15, the 5th non-homogeneous defective ground, unit, the 14, the 4th non-homogeneous defective ground, unit, the 13, the 3rd non-homogeneous defective ground, unit, 12, the second non-homogeneous defective ground, unit, the first non-homogeneous defective ground, a H groove part gap structure unit 11, the 2nd H groove part gap structure unit 18 and ground unit 19.
The one H groove part gap structure unit 11, the 2nd H groove part gap structure unit 18 lay respectively at the below of the first interdigital capacitor unit 3, the second interdigital capacitor unit 6.The first non-homogeneous defective unit 12, ground and unit 17, the 6th non-homogeneous defective ground lay respectively at the below of the first interdigital capacitor unit 3, the second interdigital capacitor unit 6, and are symmetrically distributed with the center.The 14, the 4th non-homogeneous defective unit 15, ground, unit, the 13, the 3rd non-homogeneous defective ground, unit, the second non-homogeneous defective ground and unit 16, the 5th non-homogeneous defective ground all are positioned at the below of T type stub unit 4.
The described first interdigital capacitor unit 3, the second interdigital capacitor unit 6, the ratio of the finger of each interdigital capacitor unit is 2: 1, promptly connect input output port unit 1 and input output port unit 9 be 2 fingers, T type stub unit 4 is 1 finger in the middle of connecting.Spacing between finger is 0.22mm, and the first uniform transmission line unit 2 that connects the first interdigital capacitor unit, 3 one ends is 50 Ω uniform transmission lines.
The described first interdigital capacitor unit 3 is positioned at the top of 12 present positions, unit, the 11 and first non-homogeneous defective ground, unit, a H groove part crack.The described second interdigital capacitor unit 6 is positioned at the top of 17 present positions, unit, the 18 and the 6th non-homogeneous defective ground, unit, the 2nd H groove part crack.
Described two interdigital capacitor unit 3,6, T type stub unit 4, uniform transmission line unit 2,8, through-hole unit 5 and ground unit 19 are conductor.
12,13,14,15,16,17 and two H groove part gap structures unit, unit 11,18, described six non-homogeneous defective ground all is the shape that etching is removed corresponding dumbbell shape structure and gap structure on ground unit 19, forms air element.
Described H type line of rabbet joint unit 7 is to be etched away corresponding shape on the second uniform transmission line unit 8, thereby forms line of rabbet joint cellular construction.
Described dielectric-slab 10 is the low-k material, and its dielectric constant is 2.65.
Present embodiment described first the input output port 1 outer signal source, the pumping signal that adds is by the equal first even transmission line unit 2, the first interdigital capacitor unit 3, again by T type stub unit 4, the second interdigital capacitor unit 6, H type line of rabbet joint unit 7 and the second uniform transmission line unit 8 at last via second input output port 9 arrive external circuits, realize signal is carried out filtering.The interdigital capacitor of cascade and T type stub have the function of filtering low frequency signal, periodic non-homogeneous defect ground structure has the function of filtering high-frequency signal, the H type line of rabbet joint has belt-resistance function, and triplicity is got up to realize to suppress the small wide-frequency filter that the wireless LAN communication signal disturbs.
As shown in Figure 4, the frequency characteristic of present embodiment comprises: S21 (loss) parameter and S11 (return loss) parameter.Wherein abscissa is represented frequency variable, and unit is GHz; Ordinate is represented the amplitude variable, and unit is dB.The passband of ultra-wide band filter of the present invention is 3.0GHz-5.15GHz and 5.85GHz-10.8GHz, the S21 parameter in passband greater than-1.0dB, the S11 parameter in passband less than-14dB.
Claims (10)
1, a kind ofly can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs, comprise: front portion, reverse side part and input output port, it is characterized in that,
Described front portion comprises: the first uniform transmission line unit (2), the first interdigital capacitor unit (3), the second interdigital capacitor unit (6), T type stub unit (4), through-hole unit (5), H type line of rabbet joint unit (7), the second uniform transmission line unit (8), dielectric-slab (10); The input output port have two, first input output port (1) and the first uniform transmission line unit (2) join, second input output port (9) and the second uniform transmission line unit (8) join, the first interdigital capacitor unit (3) is connected by T type stub unit (4) with the second interdigital capacitor unit (6), one end of the first interdigital capacitor unit (3) links to each other with the first uniform transmission line unit (2), the other end links to each other with T type stub (4), one end of the second interdigital capacitor unit (6) links to each other with T type stub (4), and the other end links to each other with H type line of rabbet joint unit (7);
Described H type line of rabbet joint unit (7) is positioned at dielectric-slab (10) front, it goes corresponding H type groove to realize by go up etching in second uniform transmission line unit (8), the one end connects the second interdigital capacitor unit (6), and the other end connects the second uniform transmission line unit (8);
Described reverse side partly comprises: unit (12), the first non-homogeneous defective ground, unit (13), the second non-homogeneous defective ground, unit (14), the 3rd non-homogeneous defective ground, unit (15), the 4th non-homogeneous defective ground, unit (16), the 5th non-homogeneous defective ground, unit (17), the 6th non-homogeneous defective ground, a H groove part gap structure unit (11), the 2nd H groove part gap structure unit (18) and ground unit (19); The one H groove part gap structure unit (11) is positioned at the below of the first interdigital capacitor unit (3), and the 2nd H groove part gap structure unit (18) is positioned at the below of the second interdigital capacitor unit (6); The first non-homogeneous defective unit, ground (12) is positioned at the below of the first interdigital capacitor unit (3), and the 6th non-homogeneous defective unit, ground (17) is positioned at the below of the second interdigital capacitor unit (6), and is symmetrically distributed with the center; Unit (13), the second non-homogeneous defective ground, unit (14), the 3rd non-homogeneous defective ground, the 4th non-homogeneous defective unit (15), ground and the 5th non-homogeneous defective unit, ground (16) all are positioned at the below of T type stub unit (4);
Described dielectric-slab (10) is to play a supportive role, and through-hole unit (5) is passed dielectric-slab (10), and while through-hole unit (5) connects T type stub unit (4) and is positioned at the ground unit (19) of dielectric-slab (10) reverse side.
2, the small wide-frequency filter that can suppress the interference of wireless LAN communication signal as claimed in claim 1, it is characterized in that, unit (13), the described second non-homogeneous defective ground, unit (14), the 3rd non-homogeneous defective ground, the part of the head at the two ends, dumbbell shape non-homogeneous defective ground of the 4th non-homogeneous defective unit (15), ground and the 5th non-homogeneous defective unit, ground (16) is respectively in the both sides, below in T type stub unit (4), and unit (12, described six defectives ground, 13,14,15,16,17) the non-homogeneous defective of dumbbell shape ground array structure is the non-homogeneous arrangement that is arithmetic progression.
3, the small wide-frequency filter that can suppress the interference of wireless LAN communication signal as claimed in claim 1, it is characterized in that the described first interdigital capacitor unit (3), the second interdigital capacitor unit (6), T type stub unit (4), the first uniform transmission line unit (2), the second uniform transmission line unit (8), through-hole unit (5) and ground unit (19) are conductor.
4, the small wide-frequency filter that can suppress the interference of wireless LAN communication signal as claimed in claim 1, it is characterized in that, unit (12), the described first non-homogeneous defective ground, unit (13), the second non-homogeneous defective ground, unit (14), the 3rd non-homogeneous defective ground, unit (15), the 4th non-homogeneous defective ground, the 5th non-homogeneous defective unit (16), ground and the 6th non-homogeneous defective unit, ground (17) all are to go up etching at ground unit (19) to go corresponding dumbbell shape structure to form air element, a described H groove part gap structure unit (11) and the 2nd H groove part gap structure unit (18) are to go up the shape that etching is removed corresponding gap structure at ground unit (19), form air element.
5, the small wide-frequency filter that can suppress the interference of wireless LAN communication signal as claimed in claim 1, it is characterized in that, described first the input output port (1) outer signal source, the pumping signal that adds is by the first uniform transmission line unit (2), the first interdigital capacitor unit (3), again by T type stub unit (4), the second interdigital capacitor unit (6), H type line of rabbet joint unit (7) and the second uniform transmission line unit (8), at last via second input output port (9) arrive external circuit, realize signal is carried out filtering.
6, as claim 1 or 2 or 3 or 5 described a kind of small wide-frequency filters that can suppress the interference of wireless LAN communication signal, it is characterized in that, the described first interdigital capacitor unit (3), the second interdigital capacitor unit (6), the ratio of the finger of each interdigital capacitor unit is 2: 1, promptly connect input output port unit (1) and (9) be 2 fingers, what connect middle T type stub unit (4) is 1 finger, and the spacing between referring to is 0.22mm.
7, as claim 1 or the 5 described small wide-frequency filters that can suppress the interference of wireless LAN communication signal, it is characterized in that, described H type line of rabbet joint unit (7) is to be etched away corresponding shape on the second uniform transmission line unit (8), thereby forms line of rabbet joint cellular construction.
8, as claim 1 or the 3 or 5 described small wide-frequency filters that can suppress the interference of wireless LAN communication signal, it is characterized in that the described first uniform transmission line unit (2) is 50 Ω uniform transmission lines.
9, the small wide-frequency filter that can suppress the interference of wireless LAN communication signal as claimed in claim 1 is characterized in that described dielectric-slab (10), its dielectric constant are 2.65.
10, the small wide-frequency filter that can suppress the interference of wireless LAN communication signal as claimed in claim 1, it is characterized in that, described dielectric-slab (10) is the first uniform transmission line unit (2), the second uniform transmission line unit (8), the first interdigital capacitor unit (3), the second interdigital capacitor unit (6), T type stub unit (4), H type line of rabbet joint unit (7) on its one side; On the another side unit (12), the first non-homogeneous defective ground, unit (13), the second non-homogeneous defective ground, unit (14), the 3rd non-homogeneous defective ground, unit (15), the 4th non-homogeneous defective ground, unit (16), the 5th non-homogeneous defective ground, unit (17), the 6th non-homogeneous defective ground, a H groove part gap structure unit (11), the 2nd H groove part gap structure unit (18) and ground unit (19).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100407465A CN100566147C (en) | 2007-05-17 | 2007-05-17 | Can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs |
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| CNB2007100407465A CN100566147C (en) | 2007-05-17 | 2007-05-17 | Can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs |
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| CN100566147C true CN100566147C (en) | 2009-12-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692512B (en) * | 2009-09-28 | 2012-08-01 | 长安大学 | Ultra wide band bandpass filter based on ground defective grounding structure |
| CN103117430B (en) * | 2013-02-06 | 2015-06-17 | 复旦大学 | Small ultra wide band wave filter with wave trapping property |
| CN103715482B (en) * | 2013-12-29 | 2016-06-08 | 南京邮电大学 | A kind of defect ground coplanar waveguide ultra wide band notch filter |
| CN104577268B (en) * | 2015-01-04 | 2017-06-06 | 华南理工大学 | Plane low pass band logical triplexer |
| CN107359393B (en) * | 2017-08-21 | 2020-10-02 | 广西师范大学 | Ultra-wideband microstrip band-pass filter |
| CN109244614B (en) * | 2018-08-30 | 2021-03-02 | 南京理工大学 | Harmonic suppression ultra-wideband filter based on DGS structure |
| CN109768355A (en) * | 2019-03-14 | 2019-05-17 | 金陵科技学院 | Microstrip Low-Pass based on single-unit step impedance resonator and defect ground structure |
| CN114784472B (en) * | 2022-05-25 | 2023-10-03 | 辽宁工程技术大学 | Ultra-wideband filter based on defected ground structure |
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