技术领域technical field
本发明涉及一种可调带阻滤波器，特别是一种基于人工表面等离激元的可调带阻滤波器。The invention relates to an adjustable band-stop filter, in particular to an adjustable band-stop filter based on artificial surface plasmons.
背景技术Background technique
微波滤波器作为通信系统、雷达系统、测量系统中基本的器件之一，其性能会影响到整个通信系统的质量。在日益拥挤的无线频谱资源和复杂的电磁环境下，近年来无线通信领域的一个研究热点是如何有效利用频谱资源。为了解决这一问题且满足现代通讯系统对设备“灵活多变”的需要，电控技术应运而生。一般情况下，制作一个电调谐滤波器，需要将有源开关或可调器件，如PIN管、变容二极管，或其他以功能材料为基础的元件，包括铁电变容二极管，把它们集成在无源器件中，从而通过调控外界电压，实现滤波频率的变换。电调谐滤波器具有结构简单,调谐速度快等优良特性。Microwave filter is one of the basic devices in communication system, radar system and measurement system, and its performance will affect the quality of the entire communication system. In the increasingly crowded wireless spectrum resources and complex electromagnetic environment, a research hotspot in the field of wireless communication in recent years is how to effectively use spectrum resources. In order to solve this problem and meet the "flexible" needs of modern communication systems for equipment, electronic control technology has emerged as the times require. In general, to make an electrically tuned filter, it is necessary to integrate active switches or adjustable devices, such as PIN transistors, varactor diodes, or other functional material-based components, including ferroelectric varactor diodes, into In passive devices, the filter frequency can be transformed by adjusting the external voltage. Electrically tuned filters have excellent characteristics such as simple structure and fast tuning speed.
利用结构化金属表面把电磁波强束缚在导体表面的早期工作可以追溯到上世纪五、六十年代，研究人员利用皱褶的金属表面在微波段实现电磁表面波的传输。2005年，英国帝国理工大学的John B.Pendry教授及其合作者首次提出了人工表面等离激元的概念，指出二维周期挖孔的结构化金属表面具有与光波段金属结构表面等离激元相似的色散特性，能够把电磁波约束在金属/介质界面远小于波长的范围内传输。这种结构化金属表面的等效等离子体频率仅与表面结构的几何参数有关，可以拓展到远红外、太赫兹和微波波段。继John B.Pendry的工作之后，英国埃克塞特大学的A.P.Hibbins等和巴斯大学的C.R.Williams等人先后在微波和太赫兹波段实验验证了人工表面等离激元的存在。通过改变金属表面的结构参数来人为控制人工表面等离子体频率，使其延伸到太赫兹和微波段，实现对太赫兹波和微波的强束缚，为在低频段(远红外、太赫兹、微波波段)金属表面上实现亚波长波的传输和局域开辟了一条有效途径。基于这种周期性光栅导波结构，我们提出了一种人工表面等离激元带阻滤波器设计。这种滤波器结构相比传统的滤波器结构更加紧凑，而且结构简单，具有柔性，更易于与集成到微波集成电路中。The early work of using a structured metal surface to strongly bind electromagnetic waves on the conductor surface can be traced back to the 1950s and 1960s. Researchers used corrugated metal surfaces to realize the transmission of electromagnetic surface waves in the microwave range. In 2005, Professor John B. Pendry of Imperial College London and his collaborators proposed the concept of artificial surface plasmons for the first time, pointing out that the structured metal surface with two-dimensional periodic hole digging has the same properties as the optical band metal structure surface plasmon The similar dispersion characteristics of elements can confine electromagnetic waves to transmit in a range much smaller than the wavelength at the metal/dielectric interface. The equivalent plasma frequency of this structured metal surface is only related to the geometric parameters of the surface structure, and can be extended to the far-infrared, terahertz and microwave bands. Following the work of John B. Pendry, A.P.Hibbins et al. from the University of Exeter and C.R.Williams et al. from the University of Bath successively verified the existence of artificial surface plasmons in the microwave and terahertz bands. By changing the structural parameters of the metal surface to artificially control the frequency of the artificial surface plasmon, extending it to the terahertz and microwave bands, and realizing the strong confinement of the terahertz waves and microwaves, it can be used in the low frequency bands (far infrared, terahertz, microwave bands) ) has opened up an effective way to realize the transmission and localization of subwavelength waves on the metal surface. Based on this periodic grating waveguiding structure, we propose an artificial surface plasmon bandstop filter design. Compared with the traditional filter structure, this filter structure is more compact, simple in structure, flexible, and easier to be integrated into microwave integrated circuits.
发明内容Contents of the invention
本发明的目的是要提供一种结构简单,调谐速度快的基于人工表面等离激元的可调带阻滤波器The purpose of the present invention is to provide a tunable band-stop filter based on artificial surface plasmons with simple structure and fast tuning speed.
本发明的目的是这样实现的：该可调带阻滤波器包括：介质基板和两端的端口；还包括周期性直金属光栅、两个相同的加载变容二极管的金属开口谐振环、共面波导和耦合结构；The object of the present invention is achieved like this: the tunable bandstop filter includes: a dielectric substrate and ports at both ends; it also includes a periodic straight metal grating, two identical metal split resonators loaded with varactor diodes, and a coplanar waveguide and coupling structures;
所述周期性直金属光栅波导由中间向两端分别连接耦合结构和共面波导；两个相同的加载变容二极管的金属开口谐振环与周期性直金属光栅组合构成可调谐结构；所述共面波导为导波传输结构；所述耦合结构为耦合器，耦合结构由槽深渐变的周期性金属光栅和弧线形状的金属导体组成；所述周期性直金属光栅为槽深相同、周期一致的人工表面等离激元传输结构；两个相同的加载变容二极管的金属开口谐振环以相同的形式印制在介质基板正面；所述周期性直金属光栅两端顺序与耦合结构和共面波导连接的结构，印制在介质基板正面；The periodic straight metal grating waveguide is respectively connected to the coupling structure and the coplanar waveguide from the middle to both ends; two identical metal split resonators loaded with varactor diodes are combined with the periodic straight metal grating to form a tunable structure; the common The surface waveguide is a guided wave transmission structure; the coupling structure is a coupler, and the coupling structure is composed of a periodic metal grating with a gradually changing groove depth and an arc-shaped metal conductor; the periodic straight metal grating has the same groove depth and the same period The artificial surface plasmon transmission structure; two identical metal split resonators loaded with varactor diodes are printed in the same form on the front of the dielectric substrate; the two ends of the periodic straight metal grating are sequentially aligned with the coupling structure and coplanar The structure of the waveguide connection is printed on the front of the dielectric substrate;
所述的人工表面等离激元传输器由周期性排列的金属单元组成；所述金属单元为金属薄膜；所述金属单元的形状为矩形，每个金属单元的长度和宽度均相同；所述金属单元上均设置有垂直于人工表面等离激元传输器长度方向的凹槽；所述凹槽位于人工表面等离激元传输器的同侧，凹槽的宽度和深度均相同。The artificial surface plasmon transmitter is composed of periodically arranged metal units; the metal units are metal thin films; the shape of the metal units is rectangular, and the length and width of each metal unit are the same; the The metal units are provided with grooves perpendicular to the length direction of the artificial surface plasmon transmitter; the grooves are located on the same side of the artificial surface plasmon transmitter, and the width and depth of the grooves are the same.
进一步的，两个相同加载变容二极管的金属环开口谐振环是方形开口环，并且方形开口环的开口与直金属光栅凹槽开口相对放置，方形开口环开口底边与凹槽底边和凹槽两侧边的间隙相同；通过控制直金属光栅结构的表面凹槽深度、宽度和周期性来改变金属表面的色散曲线，设计满足工作频段的金属光栅结构。Further, two metal ring split resonators loaded with the same varactor diode are square split rings, and the opening of the square split ring is placed opposite to the opening of the straight metal grating groove, and the bottom edge of the square split ring is connected to the bottom edge of the groove and the concave The gaps on both sides of the groove are the same; the dispersion curve of the metal surface is changed by controlling the surface groove depth, width and periodicity of the straight metal grating structure, and a metal grating structure that meets the working frequency band is designed.
进一步的，所述加载变容二极管以焊接方式加载到金属开口谐振环构成可调谐结构；耦合结构实现了由传统共面波导到由单导线光栅结构的高效匹配，实现了导波到等离子激元之间的高效转换和传输。Further, the loaded varactor diode is loaded to the metal split resonator ring by welding to form a tunable structure; the coupling structure realizes efficient matching from the traditional coplanar waveguide to the single-wire grating structure, and realizes the waveguide to the plasmon Efficient conversion and transmission between.
进一步的，加载变容二极管的金属开口谐振环为亚波长可调谐结构，两谐振环中心间距为三以上整数倍的金属单元长度，以削弱两环之间的相互干扰。Furthermore, the metal split resonant ring loaded with varactor diodes is a sub-wavelength tunable structure, and the distance between the centers of the two resonant rings is more than three integral multiples of the length of the metal unit, so as to weaken the mutual interference between the two rings.
进一步的，所述周期性金属光栅波导为单边开有周期性光栅结构的金属结构，支持人工表面等离激元的高效传输。Further, the periodic metal grating waveguide is a metal structure with a periodic grating structure on one side, which supports the efficient transmission of artificial surface plasmons.
进一步的，所述共面波导为双导线结构，中间导体与两侧导体间距不相等，支持导波模式。Further, the coplanar waveguide is a double-conductor structure, and the distance between the middle conductor and the conductors on both sides is not equal, and supports guided wave mode.
进一步的，通过给变容二极管加载直流偏置电压，改变谐振环的谐振频率，实现带阻滤波器中心频率可调。Further, by applying a DC bias voltage to the varactor diode to change the resonant frequency of the resonant ring, the center frequency of the band stop filter can be adjusted.
进一步的，双波段可调带阻滤波器以印刷电路板的方式制作在介质基板上，其中介质基板的另一面为不覆铜的光板。Furthermore, the dual-band tunable band-stop filter is fabricated on the dielectric substrate in the form of a printed circuit board, wherein the other side of the dielectric substrate is an optical board without copper cladding.
有益效果，由于采用了上述方案，获得厚度对周期开槽结构色散特性的影响之后，提出了柔性、可共形的人工表面等离激元的概念，理论分析和实验验证了人工表面等离激元在超薄结构金属条上的传输。这种亚波长结构表现出非常优异的导播特性，能实现电磁波沿平面、弯曲、螺旋等不规则表面的传输，具有非常好的应用前景。周期性光栅结构金属条支持人工表面等离激元的高效传输，在信号传输和通信技术等领域有重要应用。基于这种周期性光栅导波结构。Beneficial effects, due to the adoption of the above scheme, after obtaining the influence of the thickness on the dispersion characteristics of the periodic grooved structure, the concept of a flexible and conformable artificial surface plasmon is proposed, and the theoretical analysis and experimental verification of the artificial surface plasmon Transmission of elements on ultrathin structural metal strips. This sub-wavelength structure exhibits very excellent guiding characteristics, and can realize the transmission of electromagnetic waves along irregular surfaces such as planes, bends, and spirals, and has very good application prospects. Periodic grating structure metal strips support the efficient transmission of artificial surface plasmons, and have important applications in the fields of signal transmission and communication technology. Based on this periodic grating waveguide structure.
优点：本发明的可调带阻滤波器具有结构新颖简单、重量轻、调谐范围宽、调谐速度快、性能稳定、便于制作、易于和其它的平面微波毫米波电路集成等优点，因而在微波毫米波混合集成电路或者毫米波集成电路的应用中有着良好的前景。Advantages: The adjustable band-stop filter of the present invention has the advantages of novel and simple structure, light weight, wide tuning range, fast tuning speed, stable performance, easy production, and easy integration with other planar microwave and millimeter wave circuits. It has a good prospect in the application of wave hybrid integrated circuit or millimeter wave integrated circuit.
(1)本发明的可调带阻滤波器可以在单面电路上加工，甚至超薄结构的柔性电路板上加工。(1) The adjustable band-stop filter of the present invention can be processed on a single-sided circuit, even on a flexible circuit board with an ultra-thin structure.
(2)与现有的微带线相比，该结构不需要地线，可以自由导波，具有非常小的传输损耗。(2) Compared with the existing microstrip line, the structure does not need a ground wire, can guide waves freely, and has very small transmission loss.
(3)平面化的设计易于利用现有微波、毫米波技术加工，且易于与其他器件集成。(3) The planar design is easy to process using existing microwave and millimeter wave technologies, and is easy to integrate with other devices.
(4)通过控制直金属光栅结构的表面凹槽深度、宽度和周期性来改变金属表面的色散曲线，设计满足工作频段的金属光栅结构。(4) Change the dispersion curve of the metal surface by controlling the surface groove depth, width and periodicity of the straight metal grating structure, and design a metal grating structure that meets the working frequency band.
(5)通过调节加载在变容二极管两端的电压，迅速改变可调结构的谐振频率，很快实现带阻滤波器中心频率可调的目的。(5) By adjusting the voltage loaded on both ends of the varactor diode, the resonant frequency of the adjustable structure can be changed rapidly, and the center frequency of the band-stop filter can be adjusted quickly.
附图说明：Description of drawings:
图1是本发明基于人工表面等离激元的可调带阻滤波器的结构示意图。FIG. 1 is a schematic structural diagram of the tunable band-stop filter based on artificial surface plasmons of the present invention.
图2是金属单元的结构示意图。Fig. 2 is a schematic structural diagram of a metal unit.
图3是加载变容二极管的金属开口谐振环与周期性直金属光栅的位置关系示意图。Fig. 3 is a schematic diagram of the positional relationship between a metal split resonator loaded with a varactor diode and a periodic straight metal grating.
图4是加载变容二极管的金属开口谐振环的结构示意图。FIG. 4 is a schematic structural diagram of a metal split resonant ring loaded with a varactor diode.
图5是本发明的可调带阻滤波器的频率响应的仿真曲线。Fig. 5 is a simulation curve of the frequency response of the adjustable band-stop filter of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的一个实施例作进一步描述。An embodiment of the present invention will be further described below in conjunction with the accompanying drawings.
实施例1：一种基于人工表面等离激元的可调带阻滤波器，包括介质基板5和两端的端口；其特征在于，包括周期性直金属光栅1、两个相同的加载变容二极管22的金属开口谐振环21、共面波导3和耦合结构4；Embodiment 1: An adjustable band-stop filter based on artificial surface plasmons, including a dielectric substrate 5 and ports at both ends; it is characterized in that it includes a periodic straight metal grating 1, two identical loading varactor diodes 22 metal split resonators 21, coplanar waveguides 3 and coupling structures 4;
所述周期性直金属光栅1由中间向两端依次连接耦合结构4和共面波导3；两个相同的加载变容二极管的金属开口谐振环2与周期性直金属光栅1组合构成可调谐结构；所述共面波导3为导波传输结构；所述耦合结构4为耦合器，The periodic straight metal grating 1 is sequentially connected to the coupling structure 4 and the coplanar waveguide 3 from the middle to both ends; two identical metal split resonators 2 loaded with varactor diodes are combined with the periodic straight metal grating 1 to form a tunable structure ; The coplanar waveguide 3 is a guided wave transmission structure; the coupling structure 4 is a coupler,
耦合结构4由槽深渐变的周期性金属光栅41和弧线形状的金属导体42组成；所述周期性直金属光栅1为槽深相同、周期一致的人工表面等离激元传输结构；两个相同的加载变容二极管的金属开口谐振环以相同的形式印制在介质基板正面；所述周期性直金属光栅两端顺序与耦合结构和共面波导连接的结构，印制在介质基板正面；The coupling structure 4 is composed of a periodic metal grating 41 with a gradually changing groove depth and an arc-shaped metal conductor 42; the periodic straight metal grating 1 is an artificial surface plasmon transmission structure with the same groove depth and consistent period; two The same metal split resonant ring loaded with varactor diodes is printed on the front of the dielectric substrate in the same form; the structure in which both ends of the periodic straight metal grating are sequentially connected to the coupling structure and the coplanar waveguide is printed on the front of the dielectric substrate;
所述的人工表面等离激元传输器由周期性排列的金属单元组成；所述金属单元为金属薄膜；所述金属单元的形状为矩形，每个金属单元的长度和宽度均相同；所述金属单元上均设置有垂直于人工表面等离激元传输器长度方向的凹槽；所述凹槽位于人工表面等离激元传输器的同侧，凹槽的宽度和深度均相同。The artificial surface plasmon transmitter is composed of periodically arranged metal units; the metal units are metal thin films; the shape of the metal units is rectangular, and the length and width of each metal unit are the same; the The metal units are provided with grooves perpendicular to the length direction of the artificial surface plasmon transmitter; the grooves are located on the same side of the artificial surface plasmon transmitter, and the width and depth of the grooves are the same.
所述两个相同加载变容二极管22的金属开口谐振环21是方形开口环，并且方形开口环的开口与直金属光栅凹槽开口相对放置，方形开口环开口底边与凹槽底边和凹槽两侧边的间隙相同；通过控制直金属光栅结构的表面凹槽深度、宽度和周期性来改变金属表面的色散曲线，设计满足工作频段的金属光栅结构。The metal split resonant rings 21 of the two identically loaded varactor diodes 22 are square split rings, and the opening of the square split ring is placed opposite to the opening of the straight metal grating groove, and the bottom edge of the square split ring is connected to the bottom edge of the groove and the groove opening. The gaps on both sides of the groove are the same; the dispersion curve of the metal surface is changed by controlling the surface groove depth, width and periodicity of the straight metal grating structure, and a metal grating structure that meets the working frequency band is designed.
所述加载变容二极管22以焊接方式加载到金属开口谐振环21构成可调谐结构；耦合结构实现了由传统共面波导到由单导线光栅结构的高效匹配，实现了导波到等离子激元之间的高效转换和传输。The loaded varactor diode 22 is loaded onto the metal split resonant ring 21 by welding to form a tunable structure; the coupling structure realizes the efficient matching from the traditional coplanar waveguide to the single-wire grating structure, and realizes the connection between the guided wave and the plasmon. Efficient conversion and transmission between them.
所述加载变容二极管22的金属开口谐振环21为亚波长可调谐结构，两谐振环中心间距为三以上整数倍的金属单元长度，以削弱两环之间的相互干扰。The metal split resonant ring 21 loaded with the varactor diode 22 is a sub-wavelength tunable structure, and the distance between the centers of the two resonant rings is more than three integral multiples of the length of the metal unit, so as to weaken the mutual interference between the two rings.
所述周期性金属光栅波导1为单边开有周期性光栅结构的金属结构，支持人工表面等离激元的高效传输。The periodic metal grating waveguide 1 is a metal structure with a periodic grating structure on one side, supporting efficient transmission of artificial surface plasmons.
所述共面波导为双导线结构，中间导体与两侧导体间距不相等，支持导波模式。The coplanar waveguide is a double-conductor structure, the distance between the middle conductor and the conductors on both sides is unequal, and it supports the guided wave mode.
通过给变容二极管加载直流偏置电压，改变谐振环的谐振频率，实现带阻滤波器中心频率可调。The center frequency of the band stop filter can be adjusted by changing the resonant frequency of the resonant ring by loading a DC bias voltage to the varactor diode.
所述双波段可调带阻滤波器以印刷电路板的方式制作在介质基板5上，其中介质基板5的另一面为不覆铜的光板。The dual-band tunable band-stop filter is fabricated on a dielectric substrate 5 in the form of a printed circuit board, wherein the other side of the dielectric substrate 5 is a non-copper-clad optical board.
具体的：specific:
如图1和图2所示，本发明是一种基于人工表面等离激元的可调带阻滤波器，包括周期性直金属光栅1、两个相同加载变容二极管22的金属开口谐振环21、共面波导3和耦合结构4。As shown in Figure 1 and Figure 2, the present invention is a tunable band-stop filter based on artificial surface plasmons, including a periodic straight metal grating 1, two metal split resonators loaded with the same varactor diode 22 21. Coplanar waveguide 3 and coupling structure 4.
周期性直金属光栅1两端顺序连接耦合结构4和共面波导3。周期性直金属光栅1为人工表面等离激元传输器，共面波导3为导波传输线，耦合结构4为用于导波和人工表面等离激元之间相互转换的耦合器。直金属光栅结构可以弯折、折叠、缠绕、扭曲或者包裹在平滑或不平滑表面上来控制共形表面等离激元的传输。Both ends of the periodic straight metal grating 1 are sequentially connected to the coupling structure 4 and the coplanar waveguide 3 . The periodic straight metal grating 1 is an artificial surface plasmon transmitter, the coplanar waveguide 3 is a guided wave transmission line, and the coupling structure 4 is a coupler for mutual conversion between the guided wave and the artificial surface plasmon. Straight metallic grating structures can be bent, folded, twisted, twisted, or wrapped on smooth or uneven surfaces to control conformal surface plasmon transport.
其中，人工表面等离激元传输器均由周期性排列的金属单元11组成，金属单元11的形状为矩形，金属单元11的长度和宽度均相同。金属单元11由金属薄膜加工而成。金属单元11上均设置有垂直于人工表面等离激元传输器长度方向的凹槽12，凹槽12均位于人工表面等离激元传输器的同侧，凹槽12的宽度和深度均相同，直金属光栅1为长直形，金属开口谐振环21为方形环，直金属光栅1和金属开口谐振环的开口相对设置。耦合结构是由渐变非周期的金属光栅42和弧线形状的金属导体41共同组成，并且非周期性的金属光栅两侧的弧线形状的金属导体都是相同的。Wherein, the artificial surface plasmon transmitters are composed of periodically arranged metal units 11 , the shape of the metal units 11 is rectangular, and the length and width of the metal units 11 are the same. The metal unit 11 is processed from a metal thin film. Metal units 11 are provided with grooves 12 perpendicular to the length direction of the artificial surface plasmon transmitter, the grooves 12 are located on the same side of the artificial surface plasmon transmitter, and the width and depth of the grooves 12 are the same , the straight metal grating 1 is long and straight, the metal split resonant ring 21 is a square ring, and the openings of the straight metal grating 1 and the metal split resonant ring are arranged opposite to each other. The coupling structure is composed of a gradually aperiodic metal grating 42 and an arc-shaped metal conductor 41, and the arc-shaped metal conductors on both sides of the aperiodic metal grating are the same.
其中，介质基板5为聚酰亚胺基板，介电常数为3.1，厚度为0.06mm，损耗角为0.02。Wherein, the dielectric substrate 5 is a polyimide substrate with a dielectric constant of 3.1, a thickness of 0.06mm, and a loss angle of 0.02.
金属开口谐振环21是方形开口环，并且方形开口环的开口与直金属光栅凹槽开口相对放置，方形开口环的开口底边与凹槽底边间隙G为0.1mm，开口的两侧边与凹槽两侧边的间隙G1为0.1mm。该加载变容二极管的金属开口谐振环21为亚波长结构，两谐振环中心间距为三以上整数倍的金属单元长度。金属开口谐振环21的金属线宽为0.3mm，外高为3.6mm，外宽为4.6mm。The metal split resonant ring 21 is a square split ring, and the opening of the square split ring is placed opposite to the opening of the straight metal grating groove. The gap G between the bottom edge of the opening of the square split ring and the bottom edge of the groove is 0.1mm, and the two sides of the opening are The gap G1 between the two sides of the groove is 0.1 mm. The metal split resonant ring 21 loaded with varactor diodes has a sub-wavelength structure, and the distance between the centers of the two resonant rings is more than three integral multiples of the metal unit length. The metal line width of the metal split resonant ring 21 is 0.3 mm, the outer height is 3.6 mm, and the outer width is 4.6 mm.
传输线和加载变容二极管的金属开口谐振环都是一种印制在介质基板同一平面上的金属结构，单元结构的长度、高度尺寸小于工作波长，厚度远远小于工作波长，可以将表面波传输束缚在金属带周围的深度亚波长尺寸范围中，实现能量的高效传输。所述传输线由共面波导结构、耦合结构和周期性的直金属光栅结构组成。通过控制周期性直金属光栅结构的表面凹槽深度、宽度和周期性来改变金属表面的色散曲线，设计满足工作频段的金属光栅结构。通过调节加载在金属环上变容二极管的电容值，改变金属环的谐振频率，实现带阻滤波器中心频率可调的目的。本发明的可调带阻滤波器具有结构新颖简单、重量轻、性能稳定、便于制作、易于和其它的平面微波毫米波电路集成等优点，因而可以很好的应用在微波毫米波混合集成电路或者毫米波集成电路中。Both the transmission line and the metal split resonant ring loaded with varactor diodes are metal structures printed on the same plane of the dielectric substrate. The length and height of the unit structure are smaller than the working wavelength, and the thickness is much smaller than the working wavelength, which can transmit the surface wave Confinement in the deep subwavelength size range around the metal ribbon enables efficient transfer of energy. The transmission line is composed of a coplanar waveguide structure, a coupling structure and a periodic straight metal grating structure. By controlling the surface groove depth, width and periodicity of the periodic straight metal grating structure, the dispersion curve of the metal surface is changed, and the metal grating structure meeting the working frequency band is designed. By adjusting the capacitance value of the varactor diode loaded on the metal ring, the resonant frequency of the metal ring is changed, and the center frequency of the band stop filter can be adjusted. The adjustable band-stop filter of the present invention has the advantages of novel and simple structure, light weight, stable performance, easy manufacture, and easy integration with other planar microwave and millimeter wave circuits, so it can be well applied in microwave and millimeter wave hybrid integrated circuits or millimeter wave integrated circuits.
如图2，图中标注了可以调整的凹槽参数，即凹槽深度D、凹槽宽度A、凹槽的周期P，通过增大凹槽深度D，可以降低传输线传输表面波的截止频率。As shown in Figure 2, the groove parameters that can be adjusted are marked in the figure, that is, the groove depth D, the groove width A, and the groove period P. By increasing the groove depth D, the cutoff frequency of the surface wave transmitted by the transmission line can be reduced.
如图3，图中标注了加载变容二极管的金属开口谐振环相对于直金属光栅结构的相对位置参数。As shown in FIG. 3 , the relative position parameters of the metal split resonator loaded with the varactor diode relative to the straight metal grating structure are marked in the figure.
如图4，图中标注了金属开口谐振环的结构参数，即谐振环外宽K、谐振环外高H、金属环线宽W和开口宽C，通过增大加载于变容二极管上的电压值，减小二极管电容值，增大谐振环的谐振频率，从而增大滤波的频率，实现可调带阻滤波特性。As shown in Figure 4, the structural parameters of the metal split resonant ring are marked in the figure, that is, the outer width K of the resonant ring, the outer height H of the resonant ring, the line width W of the metal ring, and the opening width C. By increasing the voltage value loaded on the varactor diode , reduce the capacitance value of the diode, increase the resonant frequency of the resonant ring, thereby increasing the filtering frequency, and realizing the adjustable band-stop filtering characteristics.
如图5，图中基于人工表面等离激元的双波段带阻滤波器性能曲线包括：S21传输系数和S11反射系数。横坐标代表频率分量，单位为GHz，左边纵坐标代表幅度变量，单位为dB。从图5可以看出，本发明的可调带阻滤波器，当电压值分别为5V、10V和20V时，频率分别为9.08GHz、9.24GHz和9.43GHz的电磁波传输系数S21低于-30dB，输出端口的能量非常小，信号截止，而其他频率的传输系数S21约为-2dB，输出端口的能量很大，信号通过，即加载在变容二极管的电压值与滤波的频率值呈现正比例关系，通过控制电压，可以调控滤波的频率。As shown in Figure 5, the performance curve of the dual-band band-stop filter based on artificial surface plasmons in the figure includes: S21 transmission coefficient and S11 reflection coefficient. The abscissa represents the frequency component, the unit is GHz, and the left ordinate represents the amplitude variable, the unit is dB. As can be seen from Fig. 5, the adjustable band-stop filter of the present invention, when the voltage values are respectively 5V, 10V and 20V, the frequency is respectively 9.08GHz, 9.24GHz and 9.43GHz The electromagnetic wave transmission coefficient S21 is lower than -30dB, The energy of the output port is very small, the signal is cut off, and the transmission coefficient S21 of other frequencies is about -2dB, the energy of the output port is very large, the signal passes through, that is, the voltage value loaded on the varactor diode and the filtered frequency value are in direct proportion. By controlling the voltage, the filtering frequency can be regulated.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.
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| CN201510240420.1ACN104810579A (en) | 2015-05-12 | 2015-05-12 | Tunable bandstop filter based on artificial surface plasmon |
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| CN201510240420.1ACN104810579A (en) | 2015-05-12 | 2015-05-12 | Tunable bandstop filter based on artificial surface plasmon |
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| CN104810579Atrue CN104810579A (en) | 2015-07-29 |
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| CN201510240420.1APendingCN104810579A (en) | 2015-05-12 | 2015-05-12 | Tunable bandstop filter based on artificial surface plasmon |
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