CN101692512A - Ultra wide band bandpass filter based on ground defective grounding structure - Google Patents
Ultra wide band bandpass filter based on ground defective grounding structure Download PDFInfo
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Abstract
本发明公开了一种基于地面缺陷型接地结构的超宽带带通滤波器,包括双面敷铜微带板的正面上的电路板和反面上的接地板,电路板包括两条平行的第一耦合微带线和第二耦合微带线,第一耦合微带线通过输入端传输线和输入端口相连接,第二耦合微带线通过输出端传输线与输出端口相连接;接地板包括第一、第二和第三倒“S”型缺地陷结构,其中,第一倒“S”型缺地陷结构位于电路板两条平行的第一、第二耦合微带线和的正下方的中心,第二倒“S”型缺地陷结构和第三倒“S”型缺地陷结构对称分布在第一倒“S”型缺地陷结构的两侧,并分别位于输出端传输线和输入端传输线的正下方的中心。是一种带宽可覆盖任意超宽带频段(3.1-10.6GHz段内)的DGS超宽带带通滤波器。
The invention discloses an ultra-wideband bandpass filter based on a ground defect type grounding structure, which includes a circuit board on the front side of a double-sided copper-clad microstrip board and a grounding board on the back side, and the circuit board includes two parallel first The coupled microstrip line and the second coupled microstrip line, the first coupled microstrip line is connected to the input port through the input transmission line, and the second coupled microstrip line is connected to the output port through the output transmission line; the ground plate includes the first, The second and third inverted "S" type defect structures, wherein the first inverted "S" type defect structure is located in the center of the two parallel first and second coupled microstrip lines on the circuit board and directly below , the second inverted "S"-shaped subsidence structure and the third inverted "S"-type subsidence structure are symmetrically distributed on both sides of the first inverted "S"-type subsidence structure, and are respectively located at the output transmission line and the input end just below the center of the transmission line. It is a DGS ultra-wideband bandpass filter whose bandwidth can cover any ultra-wideband frequency band (within 3.1-10.6GHz).
Description
技术领域technical field
本发明涉及微波通信领域的滤波器,特别是一种基于地面缺陷型接地结构的超宽带带通滤波器。The invention relates to a filter in the microwave communication field, in particular to an ultra-wideband bandpass filter based on a ground defect type grounding structure.
背景技术Background technique
随着通信技术的迅速发展,人们对信息传输系统的要求越来越高。在此背景之下,超宽带技术以其系统简单、成本低、功耗小、数据传输速度快、安全性高等优点成为目前通信领域的一个研究热点。自从2002年FCC(美国联邦通信委员会)解禁了3.1-10.6GHz段的频谱,并使之能够应用于超宽带设备之后,更是在学术界和工业制造领域掀起了一股超宽带技术的研究热潮。而滤波器在整个射频超宽带电路系统中扮演着相当重要的角色。它的特性好坏对于系统的整体性能起着非常重要的作用。With the rapid development of communication technology, people have higher and higher requirements for information transmission system. In this context, ultra-wideband technology has become a research hotspot in the field of communication due to its advantages such as simple system, low cost, low power consumption, fast data transmission speed, and high security. Since the FCC (Federal Communications Commission of the United States) lifted the ban on the spectrum in the 3.1-10.6GHz band in 2002 and enabled it to be applied to ultra-wideband devices, there has been a wave of research on ultra-wideband technology in academia and industrial manufacturing. . The filter plays a very important role in the whole radio frequency UWB circuit system. Its characteristics play a very important role in the overall performance of the system.
现有的宽带带通滤波器主要包括平行耦合线滤波器,交指型滤波器,梳状线滤波器,以及开路或者短路枝节滤波器等,但是他们达到带宽的程度是有限的,一般相对带宽不超过50%。且传统的设计方法由于耦合线的奇偶模阻抗之比过大,用任何一种介质材料均难以实现。Existing broadband bandpass filters mainly include parallel coupled line filters, interdigitated filters, comb line filters, and open or short-circuit stub filters, etc., but their bandwidth is limited. Not more than 50%. And the traditional design method is difficult to realize with any kind of dielectric material because the odd-even mode impedance ratio of the coupled line is too large.
由于地面缺陷型接地结构(Defected Ground Structure,DGS)能够造成频带特殊的带阻(bandstop)或带通(bandpass)的特性,因此人们也开始思考将其引入到超宽带设计中。而传统的缺地陷结构一般为“哑铃”型、或者“矩形”,这种结构的特点是能够引入传输零点,但是其插损相对较大,选择性较差。而且目前基于DGS的超宽带滤波器不是设计复杂,就是损耗较大,结构不具有通用性,很难方便地设计任意频段的超宽带滤波器。Since the Defected Ground Structure (DGS) can cause special bandstop or bandpass characteristics of the frequency band, people have also begun to think about introducing it into the ultra-wideband design. The traditional ground defect structure is generally "dumbbell" or "rectangular". This structure is characterized by the ability to introduce transmission zeros, but its insertion loss is relatively large and its selectivity is poor. Moreover, the current ultra-wideband filter based on DGS is either complicated in design, or has a large loss, and the structure is not universal, so it is difficult to conveniently design an ultra-wideband filter in any frequency band.
经过申请人进行查阅现有文献发现,中国专利申请“超宽带微带滤波器”(申请号:200610117045.2)采用高通和低通滤波器相结合实现滤波器的超宽带特性,该发明中采用了7个哑铃型的DGS结构和缝隙单元,其结构复杂,调试参数多,设计起来很困难;再加上“哑铃”型DGS插损相对较大,选择性较差,因此此种滤波器带内最大插损达到-1.5dB,带外抑制只能达到-20dB以下。After reviewing the existing literature by the applicant, it was found that the Chinese patent application "ultra-wideband microstrip filter" (application number: 200610117045.2) uses a combination of high-pass and low-pass filters to achieve the ultra-wideband characteristics of the filter. In this invention, 7 A dumbbell-shaped DGS structure and slot unit has a complex structure and many debugging parameters, making it difficult to design; in addition, the "dumbbell" type DGS has a relatively large insertion loss and poor selectivity, so the maximum in-band filter of this type of filter is The insertion loss reaches -1.5dB, and the out-of-band suppression can only reach below -20dB.
发明内容Contents of the invention
针对上述现有技术中存在的缺陷或不足,本发明的目的在于提供一种基于地面缺陷型接地结构的超宽带带通滤波器,其结构简单,带宽可覆盖任意超宽带频段(3.1-10.6GHz段内),并能有效地抑制带外的信号,使衰减能够达到35dB以上。For the defects or deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a kind of ultra-wideband bandpass filter based on the ground defect type grounding structure, its structure is simple, and the bandwidth can cover any ultra-wideband frequency band (3.1-10.6GHz section), and can effectively suppress out-of-band signals, so that the attenuation can reach more than 35dB.
为了实现上述任务,本发明采取如下的技术解决方案:In order to realize above-mentioned task, the present invention takes following technical solution:
一种基于地面缺陷型接地结构的超宽带带通滤波器,包括设置在双面敷铜微带板的正面上的电路板和反面上的接地板,其特征在于:A kind of ultra-wideband band-pass filter based on ground defect type grounding structure, comprises the circuit board that is arranged on the front side of double-sided copper-clad microstrip board and the grounding plate on the reverse side, is characterized in that:
所述的电路板包括两条平行的第一耦合微带线和第二耦合微带线,第一耦合微带线通过输入端传输线和输入端口相连接,第二耦合微带线通过输出端传输线与输出端口相连接;The circuit board includes two parallel first coupled microstrip lines and second coupled microstrip lines, the first coupled microstrip line is connected to the input port through the input end transmission line, and the second coupled microstrip line is connected through the output end transmission line connected to the output port;
所述的接地板包括第一、第二和第三倒“S”型缺地陷结构,所述的第一、第二和第三倒“S”型缺地陷结构是在接地板上面刻蚀去相应的倒“S”形状所形成的空气单元;其中,第一倒“S”型缺地陷结构位于电路板两条平行的第一、第二耦合微带线的正下方的中心,第二倒“S”型缺地陷结构和第三倒“S”型缺地陷结构对称分布在第一倒“S”型缺地陷结构的两侧,并分别位于输出端传输线3和输入端传输线的正下方的中心。The grounding plate includes first, second and third inverted "S"-shaped recessed structures, and the first, second and third inverted "S"-shaped recessed structures are engraved on the grounding plate Etching away the air unit formed by the corresponding inverted "S" shape; wherein, the first inverted "S"-shaped defect structure is located in the center of the two parallel first and second coupled microstrip lines on the circuit board, The second inverted "S"-shaped subsidence structure and the third inverted "S"-type subsidence structure are symmetrically distributed on both sides of the first inverted "S"-type subsidence structure, and are respectively located at the output
本发明的基于地面缺陷型接地结构的超宽带带通滤波器,实现了滤波器的超宽带性能,同时保证滤波器带外的高选择性。是一种带宽可覆盖任意超宽带频段(3.1-10.6GHz段内)的DGS超宽带带通滤波器。The ultra-wideband band-pass filter based on the ground defect type grounding structure of the present invention realizes the ultra-wideband performance of the filter while ensuring high selectivity outside the filter band. It is a DGS ultra-wideband bandpass filter whose bandwidth can cover any ultra-wideband frequency band (within 3.1-10.6GHz).
附图说明Description of drawings
图1为本发明的基于地面缺陷型接地结构的超宽带带通滤波器总体结构示意图;Fig. 1 is the overall structure schematic diagram of the ultra-wideband band-pass filter based on the ground defect type grounding structure of the present invention;
图2为本发明的基于地面缺陷型接地结构的超宽带带通滤波器正面电路板结构示意图;Fig. 2 is the schematic diagram of the front circuit board structure of the ultra-wideband bandpass filter based on the ground defect type grounding structure of the present invention;
图3为本发明的基于地面缺陷型接地结构的超宽带带通滤波器背面接地板结构示意图;Fig. 3 is the structural schematic diagram of the back grounding plate of the UWB bandpass filter based on the ground defect type grounding structure of the present invention;
图4为本发明的基于地面缺陷型接地结构的超宽带带通滤波器中间部分结构示意图;Fig. 4 is the structural schematic diagram of the middle part of the UWB bandpass filter based on the ground defect type grounding structure of the present invention;
图5为本发明的基于地面缺陷型接地结构的超宽带带通滤波器中间部分结构的等效电路图;Fig. 5 is the equivalent circuit diagram of the middle part structure of the UWB bandpass filter based on the ground defect type grounding structure of the present invention;
图6为本发明的基于地面缺陷型接地结构的超宽带带通滤波器中间部分结构的频率特性示意图;Fig. 6 is a schematic diagram of the frequency characteristics of the middle part structure of the UWB bandpass filter based on the ground defect type grounding structure of the present invention;
图7为本发明的基于地面缺陷型接地结构的超宽带带通滤波器正面电路板两侧部分结构示意图;7 is a schematic diagram of the structure of the two sides of the front circuit board of the ultra-wideband bandpass filter based on the ground defect type grounding structure of the present invention;
图8为本发明的基于地面缺陷型接地结构的超宽带带通滤波器两侧部分结构的等效电路图;Fig. 8 is the equivalent circuit diagram of the structure on both sides of the UWB bandpass filter based on the ground defect type grounding structure of the present invention;
图9为本发明的基于地面缺陷型接地结构的超宽带带通滤波器两侧部分结构的频率特性示意图;9 is a schematic diagram of the frequency characteristics of the structure on both sides of the UWB bandpass filter based on the ground defect type grounding structure of the present invention;
图10为两种结构的传输响应比较图;Figure 10 is a comparison diagram of transmission responses of two structures;
图11为本发明的基于地面缺陷型接地结构的超宽带带通滤波器实测的频率特性示意图。FIG. 11 is a schematic diagram of measured frequency characteristics of the UWB bandpass filter based on the ground defect type grounding structure of the present invention.
以下结合附图和实施例对本发明作进一步的详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
具体实施方式Detailed ways
参见附图,本发明的基于地面缺陷型接地结构的超宽带带通滤波器,包括设置在双面敷铜微带板的正面上的电路板11和反面上的接地板10;Referring to the accompanying drawings, the ultra-wideband bandpass filter based on the ground defect type grounding structure of the present invention includes a
电路板11包括两条平行的第一耦合微带线1和第二耦合微带线2,第一耦合微带线1通过输入端传输线4和输入端口9相连接,第二耦合微带线2通过输出端传输线3与输出端口8相连接;The
所述的接地板10包括第一、第二和第三倒“S”型缺地陷结构(5、6、7),上述第一、第二和第三倒“S”型缺地陷结构(5、6、7)是在接地板10上面刻蚀去相应的倒“S”形状所形成的空气单元;其中,第一倒“S”型缺地陷结构(5)位于电路板11两条平行的第一、第二耦合微带线(1、2)的正下方的中心,第二倒“S”型缺地陷结构6和第三倒“S”型缺地陷结构7对称分布在第一倒“S”型缺地陷结构5的两侧,并分别位于输出端传输线3和输入端传输线4的正下方的中心。The
第一倒“S”型缺地陷结构5的倒“S”形状面积的大小用于决定超宽带带通滤波器的中心频率;第二倒“S”型缺地陷结构6和第三倒“S”型缺地陷结构7的倒“S”形状大小影响超宽带带通滤波器的带外选择性。The size of the inverted "S" shape area of the first inverted "S"
所述的第一耦合微带线1和第二耦合微带线2是均匀传输线,或者是锯齿型或其它弯折形型线。第一耦合微带线1和第二耦合微带线2的长度和宽度用于决定超宽带带通滤波器的高端截止频率;The first coupled microstrip line 1 and the second coupled
输出端传输线3和输入端传输线4的宽度能够影响超宽带带通滤波器的带内和带外选择性。The width of the
输出端传输线3和输入端传输线4是均匀传输线。The
所述的反面部分的倒“S”型缺地陷结构(5、6、7)是在接地板10的接地面上刻蚀出的。The inverted "S"-shaped recessed structures (5, 6, 7) on the reverse side are etched on the ground plane of the
由此可见,由于本发明的基于地面缺陷型接地结构的超宽带带通滤波器的带宽由第一、第二和第三倒“S”型缺地陷结构(5、6、7)的面积和平行的第一、第二耦合微带线(1、2)以及连接输入端口9和输出端口8的输出端传输线3和输入端传输线4决定,因此可以根据需要,设计任意带宽的超宽带滤波器。This shows, because the bandwidth of the UWB band-pass filter based on the ground defect type grounding structure of the present invention is by the area of first, second and the 3rd inverted " S " type ground defect structure (5,6,7) It is determined by the parallel first and second coupled microstrip lines (1, 2) and the
如图4、5、6所示,超宽带带通滤波器中间部分结构具有超宽带特性。本发明的基于地面缺陷型接地结构的超宽带带通滤波器中间部分结构的等效电路图如图5所示,包括电感L1、L2和L3,电容C1、Ca和C3,其中L1和C1串联构成一支路,C3和L3并联构成一支路,L2和Ca分别在两端。图6给出了本发明的基于地面缺陷型接地结构的超宽带带通滤波器中间部分结构的电路仿真结果和ANSOFT HFSS实物建模仿真结果,二者吻合的很好。As shown in Figures 4, 5, and 6, the structure of the middle part of the ultra-wideband bandpass filter has ultra-wideband characteristics. The equivalent circuit diagram of the middle part structure of the UWB bandpass filter based on the ground defect type grounding structure of the present invention is as shown in Figure 5, including inductance L1, L2 and L3, capacitance C1, Ca and C3, wherein L1 and C1 are connected in series to form A branch, C3 and L3 are connected in parallel to form a branch, and L2 and Ca are at both ends. Fig. 6 has provided the circuit simulation result of the middle part structure of the UWB bandpass filter based on the ground defect type grounding structure of the present invention and the ANSOFT HFSS physical modeling simulation result, and the two coincide very well.
如图7、8、9所示,超宽带带通滤波器两侧部分结构具有低通特性。其中,本发明的基于地面缺陷型接地结构的超宽带带通滤波器两侧部分结构的等效电路图,包括电感L1、L2,电容C1、C2,其中L1和C1串联构成一支路,C2构成一支路,L2分别在两端。图9给出了本发明的基于地面缺陷型接地结构的超宽带带通滤波器两侧部分结构的电路仿真结果和ANSOFT HFSS实物建模仿真结果,二者吻合的很好。As shown in Figures 7, 8, and 9, the structures on both sides of the UWB bandpass filter have low-pass characteristics. Among them, the equivalent circuit diagram of the structure on both sides of the UWB bandpass filter based on the ground defect type grounding structure of the present invention includes inductors L1, L2, capacitors C1, C2, wherein L1 and C1 are connected in series to form a branch, and C2 forms a circuit. One branch, L2 at both ends. Figure 9 shows the circuit simulation results of the structure on both sides of the UWB bandpass filter based on the ground defect type grounding structure of the present invention and the simulation results of ANSOFT HFSS physical modeling, and the two are in good agreement.
如图10所示,相比与哑铃型结构,倒“S”型带内相应十分平坦,带外衰减很快。As shown in Figure 10, compared with the dumbbell-shaped structure, the inverted "S"-shaped in-band response is very flat, and the out-of-band attenuation is very fast.
通过实际制作与测试,得到的传输参数如图11,带宽可以达到3.3-10GHz,最大插损为0.8dB,通带回波损耗最大值为-10dB,其带外衰减在-35dB以下。Through actual production and testing, the obtained transmission parameters are shown in Figure 11. The bandwidth can reach 3.3-10GHz, the maximum insertion loss is 0.8dB, the maximum passband return loss is -10dB, and the out-of-band attenuation is below -35dB.
本发明中的基于地面缺陷型接地结构的超宽带带通滤波器,可以是倒“S”型以外的其它异型结构,如“E”型,“凹”型等。The UWB bandpass filter based on the ground defect type grounding structure in the present invention can be other special-shaped structures other than the inverted "S" type, such as "E" type, "concave" type, etc.
本发明中的平行耦合线也可以变更为锯齿型或其它弯折形结构。The parallel coupled lines in the present invention can also be changed to zigzag or other bent structures.
本发明中的输出端传输线3和输入端传输线4也可以是阶梯变换的不均匀形式的传输线。The
以上的实施例,仅为本发明的一个优选实施例,用于进一步说明本发明,并不能以该实施例限定本发明实施的范围,即凡依本发明权利要求及发明说明书内容所作的简单的等效变化与修饰,皆应仍属于本发明专利覆盖的范围。The above embodiment is only a preferred embodiment of the present invention, which is used to further illustrate the present invention, and can not limit the scope of the present invention with this embodiment. Equivalent changes and modifications should still belong to the scope covered by the patent of the present invention.
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Cited By (5)
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CN101853975A (en) * | 2010-04-27 | 2010-10-06 | 华东交通大学 | Low Loss Bandpass Filter Based on Defective Ground Structure |
CN103152002A (en) * | 2011-12-07 | 2013-06-12 | 天津海泰超导电子有限公司 | Conode series resonance structure inductance-capacitance filter |
CN103943922A (en) * | 2014-04-30 | 2014-07-23 | 南通大学 | Harmonic suppression band-pass filter and manufacturing method thereof |
CN104966870A (en) * | 2015-06-29 | 2015-10-07 | 南京理工大学 | UHF Band High Performance Filter Bank Based on LTCC and DGS Technology |
CN107086339A (en) * | 2017-04-17 | 2017-08-22 | 电子科技大学 | A UWB Filter Based on a Novel Defective Microstrip Structure |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1901274B (en) * | 2006-07-27 | 2010-11-03 | 上海交通大学 | Super wide band plane microstrip filter |
CN100435409C (en) * | 2006-10-12 | 2008-11-19 | 上海交通大学 | UWB Microstrip Filter |
CN100566147C (en) * | 2007-05-17 | 2009-12-02 | 上海交通大学 | Can suppress the small wide-frequency filter that the wireless LAN communication signal disturbs |
CN101246992B (en) * | 2008-03-21 | 2011-09-28 | 东南大学 | Miniaturized ultra-wideband antenna with dual-attenuation band function |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101853975A (en) * | 2010-04-27 | 2010-10-06 | 华东交通大学 | Low Loss Bandpass Filter Based on Defective Ground Structure |
CN103152002A (en) * | 2011-12-07 | 2013-06-12 | 天津海泰超导电子有限公司 | Conode series resonance structure inductance-capacitance filter |
CN103943922A (en) * | 2014-04-30 | 2014-07-23 | 南通大学 | Harmonic suppression band-pass filter and manufacturing method thereof |
CN104966870A (en) * | 2015-06-29 | 2015-10-07 | 南京理工大学 | UHF Band High Performance Filter Bank Based on LTCC and DGS Technology |
CN107086339A (en) * | 2017-04-17 | 2017-08-22 | 电子科技大学 | A UWB Filter Based on a Novel Defective Microstrip Structure |
CN107086339B (en) * | 2017-04-17 | 2019-04-05 | 电子科技大学 | A kind of ultra-wide band filter based on novel defected microstrip structure |
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