CN110504516A - Deformed spherical waveguide resonator, filter based thereon, and processing method therefor - Google Patents
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Abstract
本发明公开了一种变形球状波导谐振器及基于其的滤波器及其加工方法，基于变形球状波导谐振器的宽阻带抑制的滤波器结构上包括波导法兰盘、第二波导法兰盘和五个直接耦合的变形球状波导谐振腔。通过改变五个变形球状波导谐振器的排布方式实现相邻谐振腔间耦合方向旋转90°，从而降低了高次模的耦合分量；通过对球状波导谐振器顶面和底面凹陷处理增大高次模与基模的频率间隔，实现了更宽的无杂散阻带，且各谐振腔的凹陷深度不同使得各谐振腔的高次模不同，进而破坏了杂散通带；在第三谐振器的顶部和底部凹陷中心开十字形槽使高次模辐射损耗，进而实现了宽阻带内超过34dB的杂散抑制能力。
The invention discloses a deformed spherical waveguide resonator, a filter based thereon and a processing method thereof. The filter structure based on the deformed spherical waveguide resonator for wide stopband suppression comprises a waveguide flange and a second waveguide flange. and five directly coupled deformed spherical waveguide resonators. By changing the arrangement of five deformed spherical waveguide resonators, the coupling direction between adjacent resonators can be rotated by 90°, thereby reducing the coupling component of higher-order modes; The frequency interval between the secondary mode and the fundamental mode achieves a wider stray-free stopband, and the different recess depths of each resonator make the higher-order modes of each resonator different, thereby destroying the stray passband; at the third resonance The top and bottom recesses of the device have a cross-shaped groove in the center to reduce the radiation loss of high-order modes, thereby achieving a spurious suppression capability exceeding 34dB in a wide stopband.
Description
技术领域technical field
本发明属于无线通信技术领域，具体涉及一种变形球状波导谐振器及基于其的滤波器及其加工方法。The invention belongs to the technical field of wireless communication, and in particular relates to a deformed spherical waveguide resonator, a filter based thereon and a processing method thereof.
背景技术Background technique
随着无线通讯技术的发展，现代先进无线电通信系统需要高性能多功能的微波毫米波器件以适应复杂多变的电磁环境。在这些无线电通信系统尤其是射频前端收发系统中，传统的微波毫米波无源波导器件，例如波导滤波器等，具有杂散抑制能力强、射频损耗低和功率容量大等优势，是研究人员关注的重点之一。With the development of wireless communication technology, modern advanced radio communication systems need high-performance and multi-functional microwave and millimeter-wave devices to adapt to the complex and changeable electromagnetic environment. In these radio communication systems, especially RF front-end transceiver systems, traditional microwave and millimeter-wave passive waveguide devices, such as waveguide filters, have the advantages of strong spurious suppression, low RF loss, and large power capacity, which are the focus of researchers. one of the focal points.
通常，尽可能选择高品质因数(Q)谐振器以实现较小的射频损耗。空气填充的金属空腔谐振器一般具有较高的功率容量，其Q值主要取决于空腔几何形状，导电率以及其表面粗糙度。在所有可能的三维几何形状，球状谐振器由于其具有最高的体积表面积比，因而具有最高的Q值，在相同的工作频率下，球形腔的Q值是矩形的Q的1.8倍。且近几年，增材制造(AM)技术的快速发展为几何复杂的波导器件物理实现提供了良好的技术支持。In general, a high quality factor (Q) resonator is chosen as much as possible to achieve low RF losses. Air-filled metal cavity resonators generally have high power capacity, and the Q value depends mainly on the cavity geometry, electrical conductivity, and its surface roughness. Among all possible three-dimensional geometries, spherical resonators have the highest Q due to their highest volume-to-surface ratio, and the Q of spherical cavities is 1.8 times higher than that of rectangles at the same operating frequency. In recent years, the rapid development of additive manufacturing (AM) technology has provided good technical support for the physical realization of geometrically complex waveguide devices.
但是，由于球状波导谐振腔内模式繁多，且高次模与基模频率间隔较小，基于球状波导谐振器的滤波器具有较多的杂散通带，且杂散通带与目标通带间隔较小。因此，滤波器的高带外抑制和宽无杂散阻带设计技术成为了基于球状波导谐振器的滤波器设计的难点和关键技术。However, due to the large number of modes in the spherical waveguide resonator and the small frequency interval between the higher-order mode and the fundamental mode, the filter based on the spherical waveguide resonator has more stray passbands, and the stray passband is separated from the target passband. smaller. Therefore, the design technology of high out-of-band rejection and wide spurious-free stop-band of the filter has become the difficult and key technology of filter design based on spherical waveguide resonator.
此外，增材制造(AM)技术能实现器件的一体化加工，减小了器件加工过程中的装配误差和成本，能实现传统减材制造技术所不能实现的复杂结构。但特别的，利用金属SLM打印工艺实现的器件的上表面具有表面粗糙度高，失真严重的特点，这将会导致器件的品质因数降低，性能恶化。In addition, additive manufacturing (AM) technology can realize the integrated processing of devices, reduce assembly errors and costs in the process of device processing, and can realize complex structures that cannot be achieved by traditional subtractive manufacturing technologies. However, in particular, the upper surface of the device realized by the metal SLM printing process has the characteristics of high surface roughness and serious distortion, which will lead to the reduction of the quality factor of the device and the deterioration of the performance.
发明内容SUMMARY OF THE INVENTION
本发明目的在于提供一种变形球状波导谐振器及基于其的滤波器及加工方法，旨在设计一种高带外抑制和宽无杂散阻带的变形球状波导谐振器，基于该谐振器设计一种基于该变形球状波导谐振器且具有宽度带抑制性能的滤波器，并结合3D打印工艺设计了降低加工器件内部粗糙度的加工方式。The purpose of the present invention is to provide a deformed spherical waveguide resonator, a filter based on the same and a processing method, and to design a deformed spherical waveguide resonator with high out-of-band suppression and wide stray-free stopband. A filter based on the deformed spherical waveguide resonator with wide band suppression performance, and a processing method for reducing the internal roughness of the processing device is designed in combination with the 3D printing process.
为了实现上述目的，本发明采用的技术方案是，一种变形球状波导谐振器，包括变形球状波导谐振腔、第一波导法兰盘和第二波导法兰盘，变形球状波导谐振腔为底部和顶部均设有球面凹陷变形的球状波导谐振腔；第一波导法兰盘和第二波导法兰盘平行于变形球状波导谐振腔的顶部和底部均设置有球面凹陷变形中心的连线；第一波导法兰盘和第二波导法兰盘相互平行，变形球状波导谐振腔与第一波导法兰盘和第二波导法兰盘的耦合处均开设第一耦合窗和第二耦合窗。In order to achieve the above purpose, the technical solution adopted in the present invention is that a deformed spherical waveguide resonator includes a deformed spherical waveguide resonator, a first waveguide flange and a second waveguide flange, and the deformed spherical waveguide resonator is the bottom and the bottom. A spherical waveguide resonator with spherical concave deformation is arranged on the top; the top and bottom of the first waveguide flange and the second waveguide flange are parallel to the deformed spherical waveguide resonator. The waveguide flange and the second waveguide flange are parallel to each other, and a first coupling window and a second coupling window are provided at the coupling positions of the deformed spherical waveguide resonant cavity and the first waveguide flange and the second waveguide flange.
随着变形球状波导谐振腔球面凹陷变形的深度增大，变形球状波导谐振腔的半径减小。The radius of the deformed spherical waveguide resonator decreases as the depth of the spherical concave deformation of the deformed spherical waveguide resonator increases.
第一耦合窗和第二耦合窗均为矩形耦合窗，第一耦合窗和第二耦合窗的长边垂直于变形球状谐振器的顶面和底面球面凹陷变形中心连线。The first coupling window and the second coupling window are both rectangular coupling windows, and the long sides of the first coupling window and the second coupling window are perpendicular to the connecting line of the spherical concave deformation center of the top surface and the bottom surface of the deformed spherical resonator.
变形球状波导谐振腔底面和顶面的球面凹陷变形面上均开设矩形槽，所述矩形槽的长边平行于第一波导法兰盘和第二波导法兰盘，所述矩形槽的中心与球面凹陷变形面的中心重合。The bottom surface and the top surface of the deformed spherical waveguide resonator are provided with rectangular grooves on the spherical concave deformed surfaces. The long sides of the rectangular grooves are parallel to the first waveguide flange and the second waveguide flange. The centers of spherical concave deformed surfaces coincide.
第一波导法兰盘和第二波导法兰盘与变形球状波导谐振腔的耦合处设置有凸台，变形球状波导谐振腔嵌入所述凸台。A boss is provided at the coupling between the first waveguide flange and the second waveguide flange and the deformed spherical waveguide resonant cavity, and the deformed spherical waveguide resonance cavity is embedded in the boss.
变形球状波导谐振腔底面和顶面的球面凹陷变形面上均开设十字形槽；所述十字形槽的中心与球面凹陷变形面的中心重合；所述十字形槽包括两个相互垂直交叉的矩形槽，其中一个矩形槽的长边平行于第一波导法兰盘。Cross-shaped grooves are provided on the spherical concave deformation surfaces of the bottom surface and the top surface of the deformed spherical waveguide resonator; the center of the cross-shaped groove coincides with the center of the spherical concave deformation surface; the cross-shaped groove includes two mutually perpendicular intersecting rectangles grooves, wherein the long side of one of the rectangular grooves is parallel to the first waveguide flange.
一种基于变形球状波导谐振器的滤波器，包括变形球状波导谐振腔、第一波导法兰盘和第二波导法兰盘；其中，变形球状波导谐振腔设置有五个，即第一变形球状波导谐振腔、第二变形球状波导谐振腔、第三变形球状波导谐振腔、第四变形球状波导谐振腔和第五变形球状波导谐振腔；所述第一变形球状波导谐振腔与第一波导法兰盘连接，第五变形球状波导谐振腔和第二波导法兰盘连接；第二变形球状波导谐振腔分别与第一变形球状波导谐振腔和第三变形球状波导谐振腔耦合；第四变形球状波导谐振腔分别与第五变形球状波导谐振腔和第三变形球状波导谐振腔耦合；其中第三变形球状波导谐振腔的顶部和底部均开设十字形槽；A filter based on a deformed spherical waveguide resonator, comprising a deformed spherical waveguide resonator, a first waveguide flange and a second waveguide flange; wherein, the deformed spherical waveguide resonator is provided with five, namely the first deformed spherical Waveguide resonant cavity, second deformed spherical waveguide resonant cavity, third deformed spherical waveguide resonant cavity, fourth deformed spherical waveguide resonant cavity and fifth deformed spherical waveguide resonant cavity; the first deformed spherical waveguide resonant cavity and the first waveguide method flange connection, the fifth deformed spherical waveguide resonator is connected with the second waveguide flange; the second deformed spherical waveguide resonator is respectively coupled with the first deformed spherical waveguide resonator and the third deformed spherical waveguide resonator; the fourth deformed spherical waveguide The waveguide resonator is respectively coupled with the fifth deformed spherical waveguide resonator and the third deformed spherical waveguide resonator; wherein the top and the bottom of the third deformed spherical waveguide resonator are provided with cross-shaped grooves;
第二变形球状波导谐振腔与第一变形球状波导谐振腔的耦合方向垂直于第二变形球状波导谐振腔和第三变形球状波导谐振腔的耦合方向；The coupling direction of the second deformed spherical waveguide resonator and the first deformed spherical waveguide resonator is perpendicular to the coupling direction of the second deformed spherical waveguide resonator and the third deformed spherical waveguide resonator;
第三变形球状波导谐振腔与第四变形球状波导谐振腔的耦合方向垂直于第二变形球状波导谐振腔与第三变形球状波导谐振腔的耦合方向；The coupling direction of the third deformed spherical waveguide resonator and the fourth deformed spherical waveguide resonator is perpendicular to the coupling direction of the second deformed spherical waveguide resonator and the third deformed spherical waveguide resonator;
第三变形球状波导谐振腔与第四变形球状波导谐振腔的耦合方向垂直于第四变形球状波导谐振腔与第五形球状波导谐振腔。The coupling direction of the third deformed spherical waveguide resonant cavity and the fourth deformed spherical waveguide resonant cavity is perpendicular to the fourth deformed spherical waveguide resonant cavity and the fifth spherical waveguide resonant cavity.
第三变形球状波导谐振腔的球面凹陷变形深度大于其余四个变形球状波导谐振腔的球面凹陷变形深度。The spherical concave deformation depth of the third deformed spherical waveguide resonator is greater than the spherical concave deformation depth of the remaining four deformed spherical waveguide resonators.
第一变形球状波导谐振腔与第二变形球状波导谐振腔之间为圆形耦合窗；A circular coupling window is formed between the first deformed spherical waveguide resonant cavity and the second deformed spherical waveguide resonant cavity;
第二变形球状波导谐振腔和第三变形球状波导谐振腔之间为圆形耦合窗；A circular coupling window is formed between the second deformed spherical waveguide resonant cavity and the third deformed spherical waveguide resonant cavity;
第三变形球状波导谐振腔与第四变形球状波导谐振腔之间为圆形耦合窗；A circular coupling window is formed between the third deformed spherical waveguide resonant cavity and the fourth deformed spherical waveguide resonant cavity;
第四变形球状波导谐振腔与第五变形球状波导谐振腔之间为圆形耦合窗。A circular coupling window is formed between the fourth deformed spherical waveguide resonant cavity and the fifth deformed spherical waveguide resonant cavity.
一种基于变形球状波导谐振器的滤波器的加工方法，采用3D打印工艺加工，将滤波器的侧面作为基面进行打印，打印时设置若干第一支撑件和第二支撑件，所述第一支撑件顶面设置为弧面，所述弧面的形状分别与其对应的变形球状波导谐振腔和第三变形球状波导谐振腔表面形状匹配；第二支撑件表面为斜面，第二支撑件用于支撑第一波导法兰盘和第二波导法兰盘。A processing method of a filter based on a deformed spherical waveguide resonator, which adopts a 3D printing process to process, uses the side surface of the filter as a base surface for printing, and sets a number of first support members and a second support member during printing. The top surface of the support member is set as an arc surface, and the shape of the arc surface matches the shape of the corresponding deformed spherical waveguide resonant cavity and the surface of the third deformed spherical waveguide resonance cavity respectively; the surface of the second support member is an inclined surface, and the second support member is used for The first waveguide flange and the second waveguide flange are supported.
与现有技术相比，本发明至少具有以下有益效果：变形球状波导谐振器第一高阶模的本征模频率和无载品质因数高于矩形谐振器的第一高阶模的本征模频率和无载品质因数，变形球状波导谐振器利用顶面和底面球面凹陷变形能将高次模拉远。Compared with the prior art, the present invention has at least the following beneficial effects: the eigenmode frequency and unloaded quality factor of the first high-order mode of the deformed spherical waveguide resonator are higher than the eigenmode frequency and unloaded quality factor of the first high-order mode of the rectangular resonator Quality factor, deformed spherical waveguide resonator utilizes top and bottom spherical concave deformation to pull higher-order modes away.
进一步的，基于变形球状波导谐振器的滤波器的变形球状波导谐振腔上开设一个矩形槽能将高次模辐射损耗掉而不影响基模，从而改善所述变形球状波导谐振器的高次模抑制特性。Further, a rectangular slot is set on the deformed spherical waveguide resonator cavity of the filter based on the deformed spherical waveguide resonator, so that the radiation of the high-order mode can be lost without affecting the fundamental mode, thereby improving the high-order mode of the deformed spherical waveguide resonator. Suppression characteristics.
进一步的，变形球状波导谐振腔上开设的十字形槽平行于基模TM101的电流，垂直切割高次模TM102和TM201的电流，从而使高次模辐射损耗，进而获得更好的高次模抑制效果。Further, the cross-shaped slot opened on the deformed spherical waveguide resonator is parallel to the current of the fundamental mode TM101, and the current of the higher-order modes TM102 and TM201 is cut vertically, so that the radiation loss of the higher-order mode is obtained, thereby obtaining better suppression of the higher-order mode. Effect.
进一步的，滤波器的各谐振腔凹陷深度均不同，各谐振腔的高次模频率不同，进而破坏了该高次模产生的杂散通带，提高了滤波器的阻带杂散抑制特性。Further, each resonator cavity of the filter has different recess depths, and each resonator cavity has a different high-order mode frequency, thereby destroying the spurious passband generated by the high-order mode, and improving the filter's stopband spurious suppression characteristics.
本发明所述基于开设有十字槽的第三变形球状波导谐振腔和变形球状波导谐振腔的滤波器通过改变各谐振腔的排布方式，使相邻谐振腔间耦合方向互相垂直，利用该结构降低高次模TM211的耦合强度，提高滤波器的带外抑制效果。The filter of the present invention based on the third deformed spherical waveguide resonant cavity and the deformed spherical waveguide resonant cavity with cross grooves changes the arrangement of the resonant cavities so that the coupling directions between adjacent resonators are perpendicular to each other. Reduce the coupling strength of the high-order mode TM211 and improve the out-of-band suppression effect of the filter.
本发明采用3D打印工艺制备基于变形球状波导谐振器的宽阻带抑制滤波器，采用其侧面作为打印时的基面，减小了所需的下表面支撑结构，从而使所加工的滤波器具有更高的无载品质因数，降低了滤波器的通带损耗。In the present invention, a 3D printing process is used to prepare a wide stop-band suppression filter based on a deformed spherical waveguide resonator, and the side surface is used as the base surface during printing, so that the required lower surface support structure is reduced, so that the processed filter has Higher unloaded quality factor reduces filter passband loss.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术方案，下面将对实施例或现有技术方案中所使用的附图作简单介绍。需要注意的是，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。In order to describe the embodiments or the prior art solutions of the present invention more clearly, the accompanying drawings used in the embodiments or the prior art solutions will be briefly introduced below. It should be noted that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.
图1为本发明实施例提供的一种变形球状波导谐振器的斜轴测图；1 is an oblique axonometric view of a deformed spherical waveguide resonator provided by an embodiment of the present invention;
图2为本发明实施例提供的一种变形球状波导谐振器的剖视图；2 is a cross-sectional view of a deformed spherical waveguide resonator according to an embodiment of the present invention;
图3为本发明实施例提供的一种变形球状波导谐振器的球面凹陷变形实现方式；FIG. 3 is an implementation manner of spherical concave deformation of a deformed spherical waveguide resonator provided by an embodiment of the present invention;
图4为本发明实施例提供的一种变形球状波导谐振器不同凹陷深度下高次模偏移效果仿真结果；FIG. 4 is a simulation result of high-order mode migration effect under different recess depths of a deformed spherical waveguide resonator according to an embodiment of the present invention;
图5为本发明实施例提供的一种开单槽变形球状波导谐振器的斜轴测图；5 is an oblique axonometric view of a single-slot deformed spherical waveguide resonator according to an embodiment of the present invention;
图6为本发明实施例提供的一种开单槽变形球状波导谐振器的剖视图；6 is a cross-sectional view of a single-slot deformed spherical waveguide resonator according to an embodiment of the present invention;
图7为本发明实施例提供三种变形球状谐振腔的滤波器高次模抑制效果仿真结果；7 is a simulation result of the high-order mode suppression effect of the filter provided by three kinds of deformed spherical resonators according to an embodiment of the present invention;
图8为本发明实施例提供的基于开十字槽变形球状波导谐振器的滤波器的斜轴测图；8 is an oblique axonometric view of a filter based on a cross-grooved deformed spherical waveguide resonator provided by an embodiment of the present invention;
图9为本发明实施例提供的基于开十字槽变形球状波导谐振器的滤波器C的剖视图；9 is a cross-sectional view of a filter C based on a cross-grooved deformed spherical waveguide resonator provided by an embodiment of the present invention;
图10为本发明实施例提供三种滤波器仿真结果。FIG. 10 provides simulation results of three filters according to an embodiment of the present invention.
图11为本发明实施例提供基于开十字槽球状波导谐振器的滤波器呈45°倾斜角的3D打印方式示意图。11 is a schematic diagram of a 3D printing method of a filter based on a cross-slotted spherical waveguide resonator with an inclination angle of 45° according to an embodiment of the present invention.
附图中，10-变形球状波导谐振腔，10a-第一变形球状波导谐振腔，10b-第二变形球状波导谐振腔，10c-第三变形球状波导谐振腔，10d-第四变形球状波导谐振腔，10e-第四变形球状波导谐振腔，101-第一耦合窗，102-第二耦合窗，20-开槽变形球状波导谐振腔，201-第一矩形槽，202-第二矩形槽，30-第一波导法兰盘，40-第二波导法兰盘，5-第一支撑件，6-第二支撑件。In the drawings, 10-deformed spherical waveguide resonator, 10a-first deformed spherical waveguide resonator, 10b-second deformed spherical waveguide resonator, 10c-third deformed spherical waveguide resonator, 10d-fourth deformed spherical waveguide resonance Cavity, 10e-fourth deformed spherical waveguide resonator, 101-first coupling window, 102-second coupling window, 20-slotted deformed spherical waveguide resonator, 201-first rectangular slot, 202-second rectangular slot, 30-first waveguide flange, 40-second waveguide flange, 5-first support, 6-second support.
具体实施方式Detailed ways
为使得本发明的目的、特征和优点能够更加明显易懂，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清晰完整地描述。需要注意的是，所描述的实施例仅仅是本发明一部分实施例，而非全部实施例。基于本发明中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。In order to make the objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
在本发明实施例的描述中，需要理解的是，术语“顶面”、“底面”、“左侧”、“右侧”、“水平方向”和“竖直方向”等指示的方位或者位置关系为基于附图所示的方位或者位置关系，仅是为了便于描述本发明实施例和简化描述，而不能认定为所指示的元件或者装置是特定的方位。In the description of the embodiments of the present invention, it should be understood that the terms "top surface", "bottom surface", "left side", "right side", "horizontal direction" and "vertical direction" indicate the orientation or position The relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present invention and simplifying the description, and should not be regarded as a specific orientation of the indicated elements or devices.
在本发明实施例的描述中，所给出的结构尺寸为优选参数，参照本发明实施例，修改各个部件的尺寸参数可以进一步得到实际所需的性能。In the description of the embodiments of the present invention, the given structural dimensions are preferred parameters. Referring to the embodiments of the present invention, the actual required performance can be further obtained by modifying the size parameters of each component.
参阅图1和图2，图1为本发明实施例提供的变形球状波导谐振器的斜轴测图，图2为本发明实施例提供的第一变形球状波导谐振器的剖面图。Referring to FIGS. 1 and 2, FIG. 1 is an oblique axonometric view of a deformed spherical waveguide resonator provided by an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a first deformed spherical waveguide resonator provided by an embodiment of the present invention.
所述的变形球状波导谐振器包括：第一波导法兰盘30、第二波导法兰盘40和变形球状波导谐振腔10。其中，第一波导法兰盘30和第二波导法兰盘40用于两个波导口之间相互连接，而波导终端与变形球状波导谐振器通过法兰盘连接；第一波导法兰盘30和第二波导法兰盘40与变形球状波导谐振腔10的耦合处设置有凸台，变形球状波导谐振腔10嵌入所述凸台。The deformed spherical waveguide resonator includes: a first waveguide flange 30 , a second waveguide flange 40 and a deformed spherical waveguide resonator 10 . Among them, the first waveguide flange 30 and the second waveguide flange 40 are used to connect the two waveguide ports, and the waveguide terminal and the deformed spherical waveguide resonator are connected through the flanges; the first waveguide flange 30 A boss is provided at the coupling between the second waveguide flange 40 and the deformed spherical waveguide resonant cavity 10 , and the deformed spherical waveguide resonance cavity 10 is embedded in the boss.
本发明实施例中的第一波导法兰盘30和第二波导法兰盘40的尺寸均为X频段下WR-90标准矩形波导法兰盘尺寸，所述矩形波导法兰盘的尺寸为22.86mm×10.16mm，矩形波导法兰盘与变形球状谐振腔顶面和底面凹陷中心连线平行，矩形波导法兰盘的长边与变形球状谐振腔顶面和底面凹陷中心连线相垂直，波导法兰盘的厚度为5mm。The size of the first waveguide flange 30 and the second waveguide flange 40 in the embodiment of the present invention are both the size of the WR-90 standard rectangular waveguide flange in the X frequency band, and the size of the rectangular waveguide flange is 22.86 mm×10.16mm, the rectangular waveguide flange is parallel to the line connecting the top and bottom recesses of the deformed spherical resonator, and the long side of the rectangular waveguide flange is perpendicular to the line connecting the top and bottom recesses of the deformed spherical resonator. The waveguide The thickness of the flange is 5mm.
本发明实施例中的所有基于变形球状波导谐振腔的谐振器和基于所述变形球状波导谐振器的滤波器壁厚均为3mm。All the resonators based on the deformed spherical waveguide resonators and the filters based on the deformed spherical waveguide resonators in the embodiments of the present invention have a wall thickness of 3 mm.
图3为本发明实施例提供的变形球状波导谐振腔10的球面凹陷变形的几何示意图，所述变形球状波导谐振腔10底面和顶面的球面凹陷变形为球面形凹陷，所述球面形凹陷是采用目标的球形谐振腔几何减去两个球体与之相交的球面部分所得；其中待减球体Q2的半径为r2，目标球谐振腔的半径为r1，待减球体Q2与目标球谐振腔相交部分的最大深度d为所述变形球状谐振腔10上球面凹陷变形的凹陷最大深度，所述球面凹陷变形的最大深度不超过变形球状波导谐振腔10的半径。FIG. 3 is a geometric schematic diagram of the deformation of the spherical depression of the deformed spherical waveguide resonator 10 according to the embodiment of the present invention. The spherical depressions on the bottom surface and the top surface of the deformed spherical waveguide resonator 10 are deformed into spherical depressions, and the spherical depressions are The spherical resonator geometry of the target is used to subtract the spherical part where the two spheres intersect with it; the radius of the sphere to be subtracted Q2 is r2, the radius of the target sphere resonator is r1, and the intersecting part of the sphere Q2 and the target sphere resonant cavity is subtracted The maximum depth d of the deformed spherical resonator 10 is the maximum depth of the spherical concave deformation on the deformed spherical resonator 10 , and the maximum depth of the spherical concave deformation does not exceed the radius of the deformed spherical waveguide resonator 10 .
所述基于变形球状波导谐振腔的谐振器利用双端口弱耦合仿真考察其频率响应，变形球状波导谐振腔10上开设有第一耦合窗101和第二耦合窗102，第一耦合窗101和第二耦合窗102分别为第一波导法兰盘30和第二波导法兰盘40与变形球状波导谐振腔10的耦合窗，所述矩形耦合窗的截面尺寸为3.43mm×10.16mm；第一耦合窗101和第二耦合窗102分部开设在与第一波导法兰盘30和第二波导法兰盘40连接处，第一耦合窗101和第二耦合窗102中心的连线垂直于变形球状谐振腔顶面和底面凹陷中心的连线。The resonator based on the deformed spherical waveguide resonator uses two-port weak coupling simulation to investigate its frequency response. The deformed spherical waveguide resonator 10 is provided with a first coupling window 101 and a second coupling window 102. The two coupling windows 102 are the coupling windows of the first waveguide flange 30 and the second waveguide flange 40 and the deformed spherical waveguide resonator 10 respectively. The cross-sectional size of the rectangular coupling window is 3.43mm×10.16mm; The window 101 and the second coupling window 102 are partially opened at the connection with the first waveguide flange 30 and the second waveguide flange 40, and the connecting line between the centers of the first coupling window 101 and the second coupling window 102 is perpendicular to the deformed spherical shape. The line connecting the center of the recess on the top and bottom surfaces of the resonator.
图4为本发明实施例提供的一种变形球状波导谐振腔10随着球面凹陷变形的深度d变化下高次模偏移效果仿真结果对比；待减球体半径r2＝17.5mm，为了保持基于变形球状波导谐振腔的谐振器基模不变，球面凹陷变形的深度d增大时，变形球状波导谐振腔10的半径应随之减小，d＝0mm，r1＝13.1；d＝2mm，r1＝12.925；d＝4mm，r1＝12.417；d＝6mm，r1＝11.67；随着球面凹陷变形的深度d增大，高次模TM201和TM102相对基模TM101的频率间隔增大，从而为基于变形球状波导谐振腔的谐振器提供了更宽的无杂散阻带；但是随着球面凹陷变形的深度d增大，所述基于变形球状波导谐振腔的谐振器的无载品质因数稍有降低，其第一高阶模的本征模频率和无载品质因数(6850)仍然比矩形谐振器高27％和13％，需要注意的是，所述的基于变形球状波导谐振腔的谐振器利用顶面和底面球面凹陷变形的方法仅能将高次模拉远，并不能消除高次模。4 is a comparison of the simulation results of the high-order mode migration effect of a deformed spherical waveguide resonator 10 provided by an embodiment of the present invention with the depth d of spherical concave deformation; The fundamental mode of the resonator of the spherical waveguide resonator remains unchanged. When the depth d of the spherical concave deformation increases, the radius of the deformed spherical waveguide resonator 10 should decrease accordingly, d=0mm, r1=13.1; d=2mm, r1= 12.925; d=4mm, r1=12.417; d=6mm, r1=11.67; as the depth d of the spherical concave deformation increases, the frequency interval of the higher-order modes TM201 and TM102 relative to the fundamental mode TM101 increases, so the spherical shape based on the deformation increases. The resonator of the waveguide resonator provides a wider spurious-free stopband; however, as the depth d of the spherical concave deformation increases, the unloaded quality factor of the resonator based on the deformed spherical waveguide resonator decreases slightly, which The eigenmode frequency and unloaded quality factor (6850) of the first higher-order mode are still 27% and 13% higher than those of the rectangular resonator, it should be noted that the described deformed spherical waveguide cavity-based resonator utilizes top and bottom surfaces The method of spherical concave deformation can only pull the high-order mode away, but cannot eliminate the high-order mode.
图5为本发明实施例提供的基于开槽变形球状波导谐振腔的谐振器斜轴测图，图6为本发明实施例提供的基于开槽变形球状波导谐振腔的谐振器的剖视图；所述基于开槽变形球状波导谐振腔的谐振器包括：第一波导法兰盘30、第二波导法兰盘40和开槽变形球状波导谐振腔；开槽变形球状波导谐振腔两端口开设第一耦合窗101和第二耦合窗102，第一耦合窗101和第二耦合窗102的尺寸与变形球状波导谐振腔10的两端的第一耦合窗101相同；开槽变形球状波导谐振腔是在变形球状波导谐振腔10的基础上进行改进，具体的，在变形球状波导谐振腔10的顶面和底面的凹陷中心分别开设第一矩形槽201和第二矩形槽202形成，所述第一矩形槽201和第二矩形槽202的长边平行于所述第一波导法兰盘30和第二波导法兰盘40的长边，且其物理尺寸为16mm×1.5mm。所述第一矩形槽201和第二矩形槽202平行于在所述开槽变形球状波导谐振腔的凹陷处基模产生的表面电流，第一矩形槽201和第二矩形槽202垂直于高次模TM201产生的表面电流，因此，第一矩形槽201和第二矩形槽202能将高次模辐射损耗掉而不影响基模，从而改善所述基于开槽变形球状波导谐振腔的谐振器的高次模抑制特性。5 is an oblique axonometric view of a resonator based on a slotted deformed spherical waveguide resonator provided by an embodiment of the present invention, and FIG. 6 is a cross-sectional view of a resonator based on a slotted deformed spherical waveguide resonator provided by an embodiment of the present invention; The resonator based on the slotted deformed spherical waveguide resonator includes: a first waveguide flange 30, a second waveguide flange 40 and a slotted deformed spherical waveguide resonator; the two ports of the slotted deformed spherical waveguide resonator are provided with a first coupling The size of the window 101 and the second coupling window 102 is the same as that of the first coupling window 101 at both ends of the deformed spherical waveguide cavity 10; the slotted deformed spherical waveguide cavity is in the deformed spherical shape. Improvements are made on the basis of the waveguide resonant cavity 10. Specifically, a first rectangular slot 201 and a second rectangular slot 202 are respectively formed in the concave center of the top surface and the bottom surface of the deformed spherical waveguide resonant cavity 10. The first rectangular slot 201 is formed. The long sides of the second rectangular slot 202 are parallel to the long sides of the first waveguide flange 30 and the second waveguide flange 40 , and their physical dimensions are 16 mm×1.5 mm. The first rectangular slot 201 and the second rectangular slot 202 are parallel to the surface current generated by the fundamental mode in the recess of the slotted deformed spherical waveguide resonator, and the first rectangular slot 201 and the second rectangular slot 202 are perpendicular to the higher order Therefore, the first rectangular slot 201 and the second rectangular slot 202 can radiate away the higher-order mode without affecting the fundamental mode, thereby improving the resonator based on the slotted deformed spherical waveguide resonator. High-order mode suppression characteristics.
由于所述变形球状波导谐振腔10具有轴对称性，其高次模TM201具有极化兼并模式TM102，为了进一步消除所述开槽变形球状波导谐振腔中一对极化兼并高次模，在所述变形球状波导滤波腔10顶面和底面凹陷中心开十字形槽，从而形成第三变形球状波导谐振腔10c；所述的十字形槽包括两个互相垂直的矩形槽，所述矩形槽的尺寸为16mm×1.5mm；所述开槽变形球状波导谐振腔和第三变形球状波导谐振腔10c的无载品质因数分别为6820和6800，所以，在所述变形球状波导谐振腔顶面和底面开槽对基模影响很小。Since the deformed spherical waveguide resonator 10 has axial symmetry, its higher-order mode TM201 has a polarization merged mode TM102. In order to further eliminate a pair of polarization merged higher-order modes in the slotted deformed spherical waveguide resonator, the The top surface and bottom surface of the deformed spherical waveguide filter cavity 10 have a cross-shaped groove in the center of the depression, thereby forming a third deformed spherical waveguide resonant cavity 10c; the cross-shaped groove includes two mutually perpendicular rectangular grooves. The size of the rectangular groove is is 16mm×1.5mm; the unloaded quality factors of the slotted deformed spherical waveguide resonator and the third deformed spherical waveguide resonator 10c are 6820 and 6800 respectively. The groove has little effect on the base mode.
参考图7，本发明提供的基于变形球状谐振腔的谐振器a、基于开矩形槽的变形球状波导谐振腔的谐振器b和基于开十字槽的变形球状谐振腔的谐振器c的高次模抑制效果仿真结果；由图7可知，所述的基于变形球状谐振腔的谐振器利用球面凹陷变形只能使高次模与基模的间隔增大，高次模依然存在；而所述的基于开矩形槽的变形球状波导谐振腔的谐振器和基于开十字槽的第三变形球状谐振腔10c的谐振器利用在变形球状谐振腔顶面和底面开槽使高次模辐射损耗的方法将实现对高次模良好的抑制效果，由于所述谐振器的激励方式仅能激励起兼并高次模中的TM201，因此，所述的基于开矩形槽的变形球状波导谐振腔的谐振器和基于开十字槽的第三变形球状谐振腔10c的谐振器有相同的高次模抑制效果。Referring to FIG. 7 , the higher-order modes of the resonator a based on the deformed spherical resonator provided by the present invention, the resonator b based on the deformed spherical waveguide resonator with a rectangular slot, and the resonator c based on the cross-slotted deformed spherical resonator The simulation results of the suppression effect; it can be seen from Fig. 7 that the resonator based on the deformed spherical resonator can only increase the interval between the higher-order mode and the fundamental mode by using spherical concave deformation, and the higher-order mode still exists; The resonator of the deformed spherical waveguide resonator with rectangular slot and the resonator based on the third deformed spherical resonator 10c with cross slot will realize the high-order mode radiation loss by slotting the top and bottom surfaces of the deformed spherical resonator. The high-order mode has a good suppression effect. Since the excitation mode of the resonator can only excite the TM201 in the merged high-order mode, the above-mentioned resonator based on the deformed spherical waveguide resonator with a rectangular slot and the resonator based on the open The resonator of the third deformed spherical resonator 10c of the cross groove has the same high-order mode suppression effect.
参考图8，本发明实施例提供的一种基于开十字槽变形球状谐振腔的滤波器斜轴测图，图9为本发明实施例提供的基于开十字槽的变形球状谐振腔的滤波器的剖视图；所述的基于开十字槽变形球状谐振腔的滤波器包括：第一波导法兰盘30、第二波导法兰盘40、四个变形球状波导谐振腔和一个第三变形球状波导谐振腔10c；其余四个变形球状波导谐振腔分别为第一变形球状波导谐振腔10a、第二变形球状波导谐振腔10b、第四变形球状波导谐振腔10d和第五变形球状波导谐振腔10e；第一波导法兰盘30与第一变形球状波导谐振腔10a连接，所述的第二波导法兰盘40与第四变形球状谐振器10d连接；第一变形球状波导谐振腔10a的耦合窗和第四变形球状谐振器10d的耦合窗均为矩形，矩形耦合窗长a1＝14.576mm，其宽为b1＝10.15mm。Referring to FIG. 8 , an oblique axonometric view of a filter based on a cross-slotted deformed spherical resonator provided by an embodiment of the present invention, and FIG. Cross-sectional view; the filter based on the cross-grooved deformed spherical resonator includes: a first waveguide flange 30, a second waveguide flange 40, four deformed spherical waveguide resonators and a third deformed spherical waveguide resonator 10c; the remaining four deformed spherical waveguide resonators are respectively the first deformed spherical waveguide resonant cavity 10a, the second deformed spherical waveguide resonant cavity 10b, the fourth deformed spherical waveguide resonant cavity 10d and the fifth deformed spherical waveguide resonant cavity 10e; The waveguide flange 30 is connected to the first deformed spherical waveguide resonator 10a, the second waveguide flange 40 is connected to the fourth deformed spherical resonator 10d; the coupling window of the first deformed spherical waveguide resonator 10a and the fourth The coupling windows of the deformed spherical resonator 10d are all rectangular, and the rectangular coupling window has a length of a1=14.576 mm and a width of b1=10.15 mm.
为了改善所述基于开十字槽的第三变形球状谐振腔10c和变形球状谐振腔10的滤波器的阻带抑制特性，通过改变谐振腔的排布方式使得各相邻谐振腔间耦合方向互相垂直，即第二变形球状波导谐振腔10b和第三变形球状谐振腔10c之间的耦合方向相对于第一变形球状波导谐振腔10a和第二变形球状波导谐振腔10b间耦合方向逆时针旋转了90°，开十字槽的第三变形球状谐振腔10c和第四变形球状波导谐振腔10d间耦合方向相对于第二变形球状波导谐振腔10b和第三变形球状谐振腔10c间耦合方向顺时针旋转了90°，而第四变形球状波导谐振腔10d和第五变形球状波导谐振腔10e间耦合方向又相对于第三变形球状谐振腔10c和第四变形球状波导谐振腔10d间耦合方向逆时针旋转90°，采用上述结构降低了高次模TM211的耦合强度，从而进一步提高了滤波器的带外抑制效果。In order to improve the stop-band suppression characteristics of the filter based on the cross-grooved third deformed spherical resonator 10c and the deformed spherical resonator 10, the arrangement of the resonators is changed so that the coupling directions between adjacent resonators are perpendicular to each other. , that is, the coupling direction between the second deformed spherical waveguide resonator 10b and the third deformed spherical waveguide resonator 10c is rotated 90 counterclockwise relative to the coupling direction between the first deformed spherical waveguide resonator 10a and the second deformed spherical waveguide resonator 10b °, the coupling direction between the cross-slotted third deformed spherical resonator 10c and the fourth deformed spherical waveguide resonator 10d is rotated clockwise relative to the coupling direction between the second deformed spherical waveguide resonator 10b and the third deformed spherical resonator 10c 90°, and the coupling direction between the fourth deformed spherical waveguide resonator 10d and the fifth deformed spherical waveguide resonator 10e is rotated 90 counterclockwise relative to the coupling direction between the third deformed spherical waveguide resonator 10c and the fourth deformed spherical waveguide resonator 10d °, the above-mentioned structure reduces the coupling strength of the high-order mode TM211, thereby further improving the out-of-band suppression effect of the filter.
第一波导法兰盘30和第二波导法兰盘40与变形球状波导谐振腔10连接处开设第二矩形耦合窗，第二矩形耦合窗的中心与第一耦合窗的中心位于同一条直线，第二矩形耦合窗的大于第一耦合窗。A second rectangular coupling window is opened at the connection between the first waveguide flange 30 and the second waveguide flange 40 and the deformed spherical waveguide resonator 10, and the center of the second rectangular coupling window and the center of the first coupling window are located on the same straight line, The second rectangular coupling window is larger than the first coupling window.
基于变形球状谐振腔滤波器的第一变形球状波导谐振腔10a和第二变形球状波导谐振腔10b间为圆形耦合窗，其直径为d12＝11.515mm；第二变形球状波导谐振腔10b和第三变形球状波导谐振腔10c间为圆形耦合窗，其直径为d23＝10.325mm，第三变形球状波导谐振腔10c和第四变形球状波导谐振腔10d间为圆形耦合窗，其直径为d34＝10.141mm，第四变形球状波导谐振腔10d和第五变形球状波导谐振腔10e间为圆形耦合窗，其直径为d45＝11.739mm。Between the first deformed spherical waveguide resonator 10a and the second deformed spherical waveguide resonator 10b based on the deformed spherical resonator filter is a circular coupling window with a diameter of d12=11.515mm; the second deformed spherical waveguide resonator 10b and the second deformed spherical waveguide resonator 10b Between the three deformed spherical waveguide resonators 10c is a circular coupling window with a diameter of d23=10.325mm, and between the third deformed spherical waveguide resonator 10c and the fourth deformed spherical waveguide resonator 10d is a circular coupling window with a diameter of d34 =10.141mm, a circular coupling window is formed between the fourth deformed spherical waveguide resonator 10d and the fifth deformed spherical waveguide resonator 10e, and its diameter is d45=11.739mm.
所述基于变形球状谐振腔滤波器的第一变形球状波导谐振腔10a是由半径Rr1＝11.489mm的球形谐振腔减去半径为R21＝17.259mm获得的变形球状谐振腔，其凹陷深度dr1＝4.125mm；第二变形球状波导谐振腔10b是由半径Rr2＝11.924mm的球形谐振腔减去半径为R22＝14.35mm获得的变形球状谐振器A，其凹陷深度dr2＝4.080mm；第四变形球状波导谐振腔10d是由半径Rr4＝11.629mm的球形谐振腔减去半径为R24＝13.546mm获得的变形球状谐振腔，其凹陷深度dr4＝4.740mm；第四变形球状波导谐振腔10d是由半径Rr5＝12.088mm的球形谐振腔减去半径为R25＝16.308mm获得的变形球状谐振腔，其凹陷深度dr5＝2.318mm；第三变形球状波导谐振腔由半径Rr3＝11.129mm的球形谐振腔减去半径为R23＝14.592mm获得的变形球状谐振腔的基础上开设十字形槽，其凹陷深度dr3＝6.096mm，变形球状谐振腔顶面和底面开十字形槽，所开十字形槽均为两互相垂直的矩形槽构成，所述矩形槽的尺寸为16mm×1.5mm；所述的基于变形球状波导谐振腔的滤波器利用变形球状谐振腔提高高次模频率，以获得更宽的无杂散阻带；各变形球状波导谐振腔的凹陷深度不同，即各变形球状波导谐振腔的高次模各不相同，从而破坏了滤波器阻带的杂散通带；此外，在第三变形球状波导谐振腔10的顶面和底面凹陷中心的十字形槽将高次模辐射损耗掉，进一步提高了滤波器的阻带性能，且所述的滤波器C五个谐振腔的排布方式，滤波器谐振腔中两极化简并高次模TM102和TM201均存在。The first deformed spherical waveguide resonator 10a based on the deformed spherical resonator filter is a deformed spherical resonator obtained by subtracting a spherical resonator with a radius of Rr1=11.489mm and a radius of R21=17.259mm, and its concave depth dr1=4.125 mm; the second deformed spherical waveguide resonator 10b is a deformed spherical resonator A obtained by subtracting a spherical resonator with a radius of Rr2=11.924mm and a radius of R22=14.35mm, and its concave depth dr2=4.080mm; the fourth deformed spherical waveguide The resonant cavity 10d is a deformed spherical resonator obtained by subtracting a spherical resonator with a radius of Rr4=11.629mm and a radius of R24=13.546mm, and its recessed depth dr4=4.740mm; the fourth deformed spherical waveguide resonator 10d is formed by a radius of Rr5= The 12.088mm spherical resonator is obtained by subtracting the deformed spherical resonator with a radius of R25=16.308mm, and its concave depth is dr5=2.318mm; the third deformed spherical waveguide resonator is a spherical resonator with a radius of Rr3=11.129mm minus the radius of On the basis of the deformed spherical resonant cavity obtained by R23=14.592mm, a cross-shaped groove is opened, and the concave depth dr3=6.096mm. Cross-shaped grooves are opened on the top and bottom surfaces of the deformed spherical resonant cavity, and the opened cross-shaped grooves are two mutually perpendicular. The size of the rectangular slot is 16mm×1.5mm; the filter based on the deformed spherical waveguide resonator utilizes the deformed spherical resonator to increase the frequency of the higher-order mode to obtain a wider spurious-free stopband; The recess depths of the deformed spherical waveguide resonators are different, that is, the higher-order modes of the deformed spherical waveguide resonators are different, thereby destroying the stray passband of the filter stopband; in addition, in the third deformed spherical waveguide resonator 10 The cross-shaped grooves in the center of the depression on the top and bottom surfaces of the filter C will lose the radiation of the high-order mode, which further improves the stop-band performance of the filter. The arrangement of the five resonant cavities of the filter C is Both polarized degenerate higher-order modes TM102 and TM201 exist.
图10为本发明实施例提供三种基于球状波导谐振器的滤波器A、滤波器B以及滤波器C仿真结果，其中滤波器A为基于理想球状(无形变)波导谐振腔的滤波器，滤波器B为基于变形球状谐振腔10的滤波器，滤波器C为基于第三变形球状波导谐振腔10c和变形球状波导谐振腔10的滤波器；所述的滤波器A和滤波器B结构与滤波器C整体结构类似；所述的基于变形球状波导谐振器的滤波器C仿真结果；滤波器工作于X波段，中心频率为10GHz，带宽为5％，其通带内损耗为0.2-0.3dB，带内回波损耗大于20dB，且该滤波器宽阻带内有超过34dB的带外杂散抑制效果。10 provides three simulation results of filter A, filter B and filter C based on spherical waveguide resonators according to an embodiment of the present invention, wherein filter A is a filter based on an ideal spherical (non-deformation) waveguide resonator. The filter B is a filter based on the deformed spherical resonant cavity 10, and the filter C is a filter based on the third deformed spherical waveguide resonant cavity 10c and the deformed spherical waveguide resonant cavity 10; The overall structure of the filter C is similar; the simulation results of the filter C based on the deformed spherical waveguide resonator; the filter works in the X-band, the center frequency is 10GHz, the bandwidth is 5%, and its passband loss is 0.2-0.3dB, The in-band return loss is greater than 20dB, and the filter has an out-of-band spurious suppression effect of more than 34dB in the wide stopband.
由滤波器A、滤波器B以及滤波器C的仿真结果对比可知，所述的滤波器A频率响应的仿真结果在13.8GHz、16.6GHz以及18GHz处均有杂散通带，且杂散信号较强，所述的滤波器B频率响应的仿真结果在15.6GHz和17GHz处仍有较强的杂散，可知滤波器B杂散通带是滤波器A的杂散通带向高频偏移形成的，滤波器B相对滤波器A有较宽的无杂散阻带，所述滤波器C频率响应的仿真结果在15.6GHz和17GHz处仍有杂散存在，但是滤波器C的杂散抑制效果相对于滤波器A和滤波器B有超过34dB的改善。From the comparison of the simulation results of filter A, filter B and filter C, it can be seen that the simulation results of the frequency response of filter A have spurious passbands at 13.8GHz, 16.6GHz and 18GHz, and the spurious signals are relatively high. Strong, the simulation results of the frequency response of filter B still have strong spurs at 15.6GHz and 17GHz. It can be seen that the spurious passband of filter B is formed by the spurious passband of filter A shifted to high frequency. Yes, filter B has a wider spurious-free stopband than filter A. The simulation results of the frequency response of filter C still have spurs at 15.6GHz and 17GHz, but the spurious suppression effect of filter C Over 34dB improvement over Filter A and Filter B.
所述滤波器C利用3D打印工艺加工，由于在打印过程中需要大量支撑结构，而附在下表面的支撑结构难以完全移除，因此打印出的器件其下表面的粗糙程度远高于上表面和侧面，如所述需支撑的下表面处于器件内部则将导致器件的无载品质因数恶化，因此在滤波器设计中，需要通过适当设计滤波器结构以及正确选择3D打印方向来避免这种向下的表面，从而避免由于工艺引起的滤波器性能恶化。The filter C is processed by the 3D printing process. Since a large number of supporting structures are required in the printing process, and the supporting structures attached to the lower surface are difficult to be completely removed, the roughness of the lower surface of the printed device is much higher than that of the upper surface and the upper surface. On the side, if the lower surface to be supported is inside the device, the unloaded quality factor of the device will deteriorate. Therefore, in the filter design, it is necessary to properly design the filter structure and correctly select the 3D printing direction to avoid this downward direction. surface, thus avoiding the deterioration of filter performance due to the process.
采用3D打印工艺加工，将滤波器C的侧面作为基面进行打印，打印时设置若干第一支撑件5和第二支撑件6，所述第一支撑件5顶面设置为弧面，所述弧面的形状分别与其对应的变形球状波导谐振腔10和第三变形球状波导谐振腔表面形状匹配；第二支撑件6表面为斜面，第二支撑件6用于支撑第一波导法兰盘30和第二波导法兰盘40；滤波器C的侧面是指以第三变形球状波导谐振腔为基准，开十字槽的面为顶面和底面，与所述十字槽所在平面垂直的面为侧面。The 3D printing process is used for printing, and the side of the filter C is used as the base surface for printing. During printing, a number of first support members 5 and second support members 6 are set. The top surface of the first support member 5 is set as an arc surface, and the The shape of the arc surface is matched with its corresponding deformed spherical waveguide resonator cavity 10 and the surface shape of the third deformed spherical waveguide resonant cavity respectively; the surface of the second support member 6 is an inclined surface, and the second support member 6 is used to support the first waveguide flange 30 and the second waveguide flange 40; the side surface of the filter C refers to the third deformed spherical waveguide resonant cavity as the reference, the surfaces with the cross grooves are the top surface and the bottom surface, and the surfaces perpendicular to the plane where the cross grooves are located are the side surfaces .
图11为本发明实施例提供一种基于球状波导谐振器的宽阻带抑制滤波器为滤波器C，所述滤波器C呈45°倾斜角的3D打印方式示意图；以第二变形球状波导谐振腔10b为例，给出器件内部下表面和上表面的相对位置，其中第一支撑件5为滤波器C加工过程中的支撑体，滤波器C在加工过程中第三变形球状波导谐振腔和第四变形球状波导谐振腔10d的顶面被耦合窗口替代，减小了所需的下表面支撑结构，从而使所加工的滤波器具有更高的无载品质因数，降低了滤波器的通带损耗。11 is a schematic diagram of a 3D printing method in which a spherical waveguide resonator-based wide stopband suppression filter is provided by an embodiment of the present invention as filter C, and the filter C has an inclination angle of 45°; the second deformed spherical waveguide resonates Cavity 10b is taken as an example, the relative positions of the lower surface and the upper surface inside the device are given, wherein the first support 5 is the support during the processing of the filter C, the third deformed spherical waveguide resonant cavity and the filter C during the processing. The top surface of the fourth deformed spherical waveguide resonator 10d is replaced by a coupling window, which reduces the required lower surface support structure, so that the processed filter has a higher unloaded quality factor and reduces the passband of the filter loss.
以上为对本发明所提供的一种波导滤波器及其制造方法的描述，对于本领域的技术人员，依据本发明实施例的思想，在具体实施方式及应用范围上均会有改变之处。综上，本说明书内容不应理解为对本发明的限制。The above is a description of a waveguide filter and a manufacturing method thereof provided by the present invention. For those skilled in the art, according to the idea of the embodiments of the present invention, there will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.
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