技术领域technical field
本发明涉及通信设备组件技术领域，具体为一种介质谐振器负耦合结构及应用其的介质波导滤波器。The invention relates to the technical field of communication equipment components, in particular to a dielectric resonator negative coupling structure and a dielectric waveguide filter using the same.
背景技术Background technique
随着移动通信技术的发展，小型化、集成化成为通信设备的发展趋势，其中，介质波导滤波器以介质谐振器为基础，通过谐振器之间的耦合实现滤波性能，其相比传统的金属腔体滤波器具有体积小、插损低、成本低、易集成化等优势，而为了实现越来越严格的性能要求，如要具有陡峭的过渡带和较低的插入损耗，通常就需要谐振器之间具有负耦合，目前介质波导谐振器之间的负耦合方式主要是在谐振器之间设置盲孔实现，如现有的一种介质波导滤波器，如图1所示，其在介质谐振器上包括至少一个负耦合盲孔3，负耦合盲孔3位于介质谐振器1、介质谐振器2连接位置的本体表面，且两种结构要求负耦合盲孔3深度至少是介质谐振器上调谐孔4深度的两倍以上，因此负耦合盲孔底部距离谐振器底面很近，从而形成强电容效应实现负耦合；但是也由于负耦合盲孔深度较深，孔身形成了电感效应，而孔底又形成了电容效应，从而形成了类似串联谐振电路的谐振效应，会在滤波器滤波曲线上形成谐振峰而导致滤波器的抑制性能无法满足特定频段的要求，一般地，谐振峰在频域上的位置是由负耦合盲孔的深度决定，深度越深频率越低，反之越高，而负耦合盲孔的深度又根据客户指标设计的耦合量决定，也就是说一旦客户指标确定，则负耦合盲孔的深度也就确定了，由负耦合盲孔引起的谐振峰在频域上的位置也就无法调整，也就会导致谐振峰落在具有较高抑制要求的频段内时，该负耦合结构无法满足滤波器性能要求；另外，由于负耦合盲孔轴向横截面较小，而谐振器之间的连接区域较大，则其他介质谐振器很容易通过此连接区域产生寄生耦合，从而导致结构对称的介质滤波器频率响应特性一边高一边低，也就无法得到需要的对称特性。With the development of mobile communication technology, miniaturization and integration have become the development trend of communication equipment. Among them, the dielectric waveguide filter is based on the dielectric resonator, and the filtering performance is realized through the coupling between the resonators. Compared with the traditional metal Cavity filters have the advantages of small size, low insertion loss, low cost, and easy integration. However, in order to achieve increasingly stringent performance requirements, such as steep transition bands and lower insertion loss, resonance is usually required There is a negative coupling between the dielectric waveguide resonators. At present, the negative coupling between the dielectric waveguide resonators is mainly realized by setting blind holes between the resonators. For example, an existing dielectric waveguide filter, as shown in Figure 1, has a dielectric The resonator includes at least one negative coupling blind hole 3, and the negative coupling blind hole 3 is located on the body surface of the connection position of the dielectric resonator 1 and the dielectric resonator 2, and the two structures require that the depth of the negative coupling blind hole 3 is at least that of the dielectric resonator The depth of the tuning hole 4 is more than twice, so the bottom of the negative coupling blind hole is very close to the bottom surface of the resonator, thereby forming a strong capacitive effect to achieve negative coupling; but also because the depth of the negative coupling blind hole is deep, the hole body forms an inductance effect, and The capacitive effect is formed at the bottom of the hole, thus forming a resonance effect similar to a series resonant circuit, which will form a resonance peak on the filter curve of the filter and cause the suppression performance of the filter to fail to meet the requirements of a specific frequency band. Generally, the resonance peak is in the frequency band. The position on the field is determined by the depth of the negative coupling blind hole. The deeper the depth, the lower the frequency, and vice versa. The depth of the negative coupling blind hole is determined according to the coupling amount designed by the customer's index. That is to say, once the customer's index is determined, Then the depth of the negative coupling blind hole is determined, and the position of the resonant peak caused by the negative coupling blind hole in the frequency domain cannot be adjusted, which will cause the resonant peak to fall in the frequency band with higher suppression requirements. This negative coupling structure cannot meet the performance requirements of the filter; in addition, due to the small axial cross-section of the negative coupling blind hole and the large connection area between resonators, other dielectric resonators can easily generate parasitic coupling through this connection area , so that the frequency response characteristics of the dielectric filter with a symmetrical structure are high on one side and low on the other, and the required symmetrical characteristics cannot be obtained.
发明内容Contents of the invention
针对上述问题，本发明提供了一种介质谐振器负耦合结构及应用其的介质波导滤波器，其可有效解决负耦合的问题，并可避免谐振峰的影响，且减弱寄生耦合，具有更加对称的频率响应特性。In view of the above problems, the present invention provides a dielectric resonator negative coupling structure and a dielectric waveguide filter using it, which can effectively solve the problem of negative coupling, avoid the influence of resonance peaks, and weaken parasitic coupling, with more symmetrical frequency response characteristics.
其技术方案是这样的：一种介质谐振器负耦合结构，其包括至少两个相连接的介质谐振器，在所述介质谐振器之间的连接处设有耦合结构，其特征在于：所述耦合结构包括长形的盲槽，所述盲槽开设于所述介质谐振器之间的所述连接处，所述盲槽的长度为所述介质谐振器之间所述连接处长度的40％～100％，所述盲槽的深度为所述介质谐振器之间所述连接处高度的50％～95％。Its technical solution is as follows: a dielectric resonator negative coupling structure, which includes at least two connected dielectric resonators, and a coupling structure is provided at the connection between the dielectric resonators, characterized in that: The coupling structure includes an elongated blind slot, the blind slot is opened at the connection between the dielectric resonators, and the length of the blind slot is 40% of the length of the connection between the dielectric resonators ~100%, the depth of the blind groove is 50%~95% of the height of the connection between the dielectric resonators.
其进一步特征在于：It is further characterized by:
所述介质谐振器的材质为陶瓷介质材料或高分子材料；所述介质谐振器的形状为圆形或是多边形块；The material of the dielectric resonator is a ceramic dielectric material or a polymer material; the shape of the dielectric resonator is a circle or a polygonal block;
在每个所述介质谐振器表面中心均设有谐振盲孔，所述谐振盲孔的深度小于所述盲槽的深度；A resonant blind hole is provided at the center of each dielectric resonator surface, and the depth of the resonant blind hole is smaller than the depth of the blind groove;
所述盲槽自所述介质谐振器之间的所述连接处的一侧伸入，且未贯穿所述介质谐振器，所述盲槽壁面与所述连接处的另一侧之间留有距离，在所述介质谐振器之间的所述连接处上未隔开的部分形成耦合部，所述耦合部呈L型；The blind groove protrudes from one side of the connection between the dielectric resonators, and does not pass through the dielectric resonator, and there is a gap between the wall of the blind groove and the other side of the connection. Distance, the unseparated part of the connection between the dielectric resonators forms a coupling part, and the coupling part is L-shaped;
所述盲槽开设于所述介质谐振器之间的所述连接处的中间位置，且所述盲槽两侧壁面与所述连接处的两侧均留有距离，以形成封闭槽结构，在所述介质谐振器之间的所述连接处上未隔开的部分形成耦合部，所述耦合部呈冂型；The blind groove is opened in the middle of the connection between the dielectric resonators, and the two sides of the blind groove are separated from the two sides of the connection to form a closed groove structure. The unseparated part of the connection between the dielectric resonators forms a coupling part, and the coupling part is in the shape of a ridge;
所述耦合部水平部分的高度不大于所述介质谐振器之间所述连接处高度的一半。The height of the horizontal portion of the coupling portion is not greater than half of the height of the connection between the dielectric resonators.
一种介质波导滤波器，其包括所述的介质谐振器负耦合结构。A dielectric waveguide filter includes the dielectric resonator negative coupling structure.
本发明的有益效果是，通过在介质谐振器之间的连接处开设盲槽，而盲槽的长度为介质谐振器之间连接处长度的40％～100％，盲槽的深度为介质谐振器之间连接处高度的50％～95％，则通过相应调节设置盲槽的长度和深度，即可实现既保证负耦合量，又保证滤波器性能满足抑制要求，避免谐振峰的影响，且通过开设的盲槽的横截面积相较现有介质谐振器上负耦合盲孔的轴向横截面积大，则可对其他介质谐振器通过连接处的耦合有阻挡作用，从而减弱了寄生耦合影响，可以得到更加对称的频率响应特性。The beneficial effect of the present invention is that by setting up blind slots at the joints between dielectric resonators, the length of the blind slots is 40% to 100% of the length of the joints between dielectric resonators, and the depth of the blind slots is 40% to 100% of the length of the joints between dielectric resonators. 50% to 95% of the height of the connection between them, by adjusting the length and depth of the blind slot accordingly, it can not only ensure the amount of negative coupling, but also ensure that the filter performance meets the suppression requirements, avoiding the influence of the resonance peak, and passing Compared with the axial cross-sectional area of the negative coupling blind hole on the existing dielectric resonator, the cross-sectional area of the opened blind slot can block the coupling of other dielectric resonators through the connection, thereby weakening the influence of parasitic coupling , a more symmetrical frequency response characteristic can be obtained.
附图说明Description of drawings
图1是现有介质谐振器的立体结构示意图；FIG. 1 is a schematic diagram of a three-dimensional structure of an existing dielectric resonator;
图2是本发明实施例一的立体结构示意图；Fig. 2 is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention;
图3是本发明实施例一的俯视结构示意图；Fig. 3 is a top view structural schematic diagram of Embodiment 1 of the present invention;
图4是本发明实施例一的纵剖结构示意图；Fig. 4 is a longitudinal sectional structural schematic diagram of Embodiment 1 of the present invention;
图5是本发明实施例一的横剖结构示意图；Fig. 5 is a cross-sectional structural schematic diagram of Embodiment 1 of the present invention;
图6是现有的介质波导滤波器通带频率响应曲线图；Fig. 6 is an existing dielectric waveguide filter passband frequency response curve;
图7是本发明实施例一的介质波导滤波器通带频率响应曲线图；FIG. 7 is a graph of the passband frequency response of the dielectric waveguide filter according to Embodiment 1 of the present invention;
图8是图6与图7的介质波导滤波器通带频率响应比较曲线图；Fig. 8 is a comparative graph of the passband frequency response of the dielectric waveguide filter of Fig. 6 and Fig. 7;
图9是本发明实施例二的结构示意图；Fig. 9 is a schematic structural diagram of Embodiment 2 of the present invention;
图10是本发明实施例二的俯视结构示意图；Fig. 10 is a schematic top view of the second embodiment of the present invention;
图11是本发明实施例二的纵剖结构示意图；Fig. 11 is a schematic longitudinal sectional structure diagram of Embodiment 2 of the present invention;
图12是本发明中实施例一和实施例二频率响应比较曲线图；Fig. 12 is a comparative graph of the frequency response of Embodiment 1 and Embodiment 2 in the present invention;
图13是本发明中实施例一、实施例二以及现有介质波导滤波器频率响应比较曲线图。Fig. 13 is a comparative graph of the frequency response of Embodiment 1, Embodiment 2 of the present invention and the existing dielectric waveguide filter.
具体实施方式Detailed ways
本发明的一种介质谐振器耦合结构，其包括相连接的介质谐振器1、介质谐振器2，即介质谐振器1、介质谐振器2连接作为一个整体，在介质谐振器1、介质谐振器2之间的连接处5设有耦合结构，耦合结构包括长形的盲槽6，盲槽6开设于介质谐振器1、介质谐振器2之间的连接处5，盲槽6的长度为介质谐振器1、介质谐振器2之间连接处5长度的40％～100％，盲槽6的深度为介质谐振器1、介质谐振器2之间连接处5高度的50％～95％。A dielectric resonator coupling structure of the present invention comprises a dielectric resonator 1 and a dielectric resonator 2 connected, that is, the dielectric resonator 1 and the dielectric resonator 2 are connected as a whole, and the dielectric resonator 1 and the dielectric resonator The connection 5 between the 2 is provided with a coupling structure, the coupling structure includes a long blind slot 6, the blind slot 6 is opened at the connection 5 between the dielectric resonator 1 and the dielectric resonator 2, and the length of the blind slot 6 is the dielectric 40%-100% of the length of the joint 5 between the resonator 1 and the dielectric resonator 2, and the depth of the blind groove 6 is 50%-95% of the height of the joint 5 between the dielectric resonator 1 and the dielectric resonator 2.
介质谐振器1、介质谐振器2的材质均为陶瓷介质材料或高分子材料制成；介质谐振器1、介质谐振器2的形状均为圆形或是多边形块，本发明实施例中采用的正方形块；在介质谐振器1、介质谐振器2表面中心均设有谐振盲孔7，谐振盲孔7既可设于介质谐振器上表面，也可以设于介质谐振器下表面，或者介质谐振器侧面，谐振盲孔7的深度小于盲槽6的深度。The materials of the dielectric resonator 1 and the dielectric resonator 2 are made of ceramic dielectric materials or polymer materials; the shapes of the dielectric resonator 1 and the dielectric resonator 2 are both circular or polygonal blocks. Square blocks; resonant blind holes 7 are provided in the center of the surface of dielectric resonator 1 and dielectric resonator 2, and resonant blind holes 7 can be arranged on the upper surface of the dielectric resonator or on the lower surface of the dielectric resonator, or the dielectric resonator On the side of the device, the depth of the resonant blind hole 7 is smaller than the depth of the blind groove 6.
一种介质波导滤波器，其包括介质谐振器负耦合结构，具体由多个介质谐振器连接而成。A dielectric waveguide filter, which includes a dielectric resonator negative coupling structure, is specifically formed by connecting a plurality of dielectric resonators.
实施例一Embodiment one
如图2～图8所示，盲槽6自介质谐振器1、介质谐振器2之间的连接处5的一侧伸入，且未贯穿介质谐振器，盲槽6壁面与连接处5的另一侧之间留有距离，相当于盲槽6的长度为介质谐振器1、介质谐振器2之间连接处5长度的80％，在介质谐振器1、介质谐振器2之间的连接处5上未隔开的部分形成耦合部8，耦合部8呈L型，也可说成是呈7字型；耦合部8水平部分的高度较低，耦合部8水平部分的高度不大于介质谐振器1、介质谐振器2之间连接处5高度的一半，从而形成容性耦合窗口；该L型的耦合部8的垂直部分起到了增强连接强度的加强筋作用，可避免当耦合部8的水平部分高度较小时，相连的介质谐振器1、介质谐振器2之间容易在连接处5出现断裂的问题。As shown in Figures 2 to 8, the blind groove 6 protrudes from one side of the connection 5 between the dielectric resonator 1 and the dielectric resonator 2, and does not penetrate the dielectric resonator, the wall of the blind groove 6 and the connection 5 There is a distance between the other side, which is equivalent to the length of the blind slot 6 being 80% of the length of the connection 5 between the dielectric resonator 1 and the dielectric resonator 2, and the connection between the dielectric resonator 1 and the dielectric resonator 2 The unseparated part on the position 5 forms a coupling part 8, and the coupling part 8 is L-shaped, which can also be said to be a 7-shaped part; the height of the horizontal part of the coupling part 8 is relatively low, and the height of the horizontal part of the coupling part 8 is not greater than that of the medium Half of the height of the joint 5 between the resonator 1 and the dielectric resonator 2, thereby forming a capacitive coupling window; the vertical part of the L-shaped coupling part 8 acts as a rib to enhance the connection strength, which can avoid the coupling part 8 When the height of the horizontal part is small, the problem of breakage easily occurs at the joint 5 between the connected dielectric resonator 1 and dielectric resonator 2 .
其中，调节耦合部8的水平部分的高度和长度均可以起到调节负耦合量，具体地，长度越长，高度越高，负耦合越强，反之负耦合越弱，而调节耦合部8的水平部分的高度和长度，也就是调节设置盲槽6的长度和深度，介质谐振器1、介质谐振器2之间的耦合为负耦合，调整盲槽6的深度可调节负耦合量，盲槽6越深耦合越弱，反之越强。Wherein, adjusting the height and length of the horizontal portion of the coupling portion 8 can both adjust the amount of negative coupling, specifically, the longer the length, the higher the height, the stronger the negative coupling, otherwise the weaker the negative coupling, and the adjustment of the coupling portion 8 The height and length of the horizontal part, that is, adjust the length and depth of the blind slot 6. The coupling between the dielectric resonator 1 and the dielectric resonator 2 is negative coupling. Adjusting the depth of the blind slot 6 can adjust the amount of negative coupling. The blind slot 6 The deeper the coupling, the weaker it is, and vice versa.
L型的耦合部8也会在介质波导滤波器滤波曲线上形成谐振峰，但谐振峰在频域上的位置可以通过调节耦合部8水平部分的长度控制，而受耦合部8水平部分高度的影响不大，且耦合部8面积较大，形成的串联谐振效应的Q值不高，因此谐振峰波峰较低，对介质波导滤波器抑制性能的影响较小，可以先调节耦合部8水平部分的长度将耦合部8引起的谐振峰移动到抑制要求不高的频段，然后通过调节耦合部8水平部分的高度来调节负耦合量，从而既保证负耦合量，又保证介质波导滤波器性能满足抑制要求；且由于盲槽6横截面积较大，对其他介质谐振器通过连接处5的耦合有阻挡作用，从而减弱了寄生耦合影响，可以得到更加对称的频率响应特性，能够极大平衡通带低端和高端的抑制水平，保证抑制余量，提高良品率。The L-shaped coupling part 8 will also form a resonant peak on the filter curve of the dielectric waveguide filter, but the position of the resonant peak in the frequency domain can be controlled by adjusting the length of the horizontal part of the coupling part 8, and is affected by the height of the horizontal part of the coupling part 8. The influence is not large, and the area of the coupling part 8 is large, and the Q value of the formed series resonance effect is not high, so the resonant peak is low, and the influence on the suppression performance of the dielectric waveguide filter is small. The horizontal part of the coupling part 8 can be adjusted first The length of the coupling part 8 moves the resonance peak caused by the coupling part 8 to the frequency band that does not require high suppression, and then adjusts the negative coupling amount by adjusting the height of the horizontal part of the coupling part 8, so as to ensure both the negative coupling amount and the performance of the dielectric waveguide filter. suppression requirements; and due to the large cross-sectional area of the blind slot 6, it has a blocking effect on the coupling of other dielectric resonators through the connection 5, thereby weakening the influence of parasitic coupling, and can obtain a more symmetrical frequency response characteristic, which can greatly balance the communication With low-end and high-end suppression levels to ensure suppression margin and improve yield.
可见，如图6、7、8所示，本发明提出介质波导滤波器在通带左边低频段处的谐振峰更低，具有更好的带外抑制性能；在通带(通带，是指信号通过滤波器时，衰减最小的频带，即滤波器允许通过信号的频率范围)附近，本发明实施例一提出的介质波导滤波器频率响应曲线更加平衡，具有更好的对称性，有利于平衡通带低端和高端的抑制水平，保证抑制余量，提高良品率。Visible, as shown in Fig. 6, 7, 8, the resonant peak of the dielectric waveguide filter proposed by the present invention is lower at the low-frequency section on the left side of the passband, and has better out-of-band suppression performance; in the passband (passband, refers to When the signal passes through the filter, the frequency band with the least attenuation, that is, the frequency range in which the filter allows the signal to pass through), the frequency response curve of the dielectric waveguide filter proposed in Embodiment 1 of the present invention is more balanced and has better symmetry, which is conducive to balance The suppression level of the low-end and high-end of the passband ensures the suppression margin and improves the yield rate.
图8中，点画线的曲线为现有技术的频率响应曲线，实线的为本发明实施例一的频率响应曲线。In FIG. 8 , the dotted line curve is the frequency response curve of the prior art, and the solid line is the frequency response curve of Embodiment 1 of the present invention.
实施例二Embodiment two
如图9、图10、图11所示，盲槽6自介质谐振器1、介质谐振器2之间的连接处5底部中心位置向上伸入，且盲槽6两侧壁面与连接处5的两侧均留有距离，没有侧向贯通，以形成封闭槽结构，相当于盲槽6的长度为介质谐振器1、介质谐振器2之间连接处5长度的80％。As shown in Fig. 9, Fig. 10 and Fig. 11, the blind groove 6 protrudes upwards from the center of the bottom of the connection 5 between the dielectric resonator 1 and the dielectric resonator 2, and the two side walls of the blind groove 6 and the connection 5 A distance is left on both sides without lateral penetration to form a closed slot structure, which is equivalent to the length of the blind slot 6 being 80% of the length of the joint 5 between the dielectric resonator 1 and the dielectric resonator 2 .
在介质谐振器1、介质谐振器2之间的连接处5上未隔开的部分形成耦合部8，耦合部8呈冂型；耦合部8水平部分的高度较低，耦合部8水平部分的高度同样小于介质谐振器1、介质谐振器2之间连接处5高度的一半，从而形成容性耦合窗口；该冂型的耦合部8跟实例一有相似的作用，耦合部8垂直部分起到了增强连接强度的加强筋作用，可以更容易避免当耦合部8的水平部分高度较小时，相连的介质谐振器1、介质谐振器2之间容易在连接处5出现断裂的问题。A coupling part 8 is formed on the unseparated part of the joint 5 between the dielectric resonator 1 and the dielectric resonator 2, and the coupling part 8 is in the form of a ridge; the height of the horizontal part of the coupling part 8 is relatively low, and the height of the horizontal part of the coupling part 8 The height is also less than half of the height of the joint 5 between the dielectric resonator 1 and the dielectric resonator 2, thereby forming a capacitive coupling window; the coupling part 8 of this type has a similar effect with the example one, and the vertical part of the coupling part 8 has played a role. The function of the reinforcing rib to enhance the connection strength can more easily avoid the problem that the connecting dielectric resonator 1 and dielectric resonator 2 are easily broken at the connection 5 when the height of the horizontal part of the coupling part 8 is small.
跟实例一相似，介质谐振器1、介质谐振器2之间的耦合为负耦合，耦合部8的水平部分的高度和长度都用于调节负耦合量，具体地，长度越长，高度越高，负耦合越强，反之负耦合越弱；而调节耦合部8的水平部分的高度和长度，也相当于调节设置盲槽6的长度和深度，盲槽6越深耦合越弱，反之越强。Similar to Example 1, the coupling between the dielectric resonator 1 and the dielectric resonator 2 is negative coupling, and the height and length of the horizontal part of the coupling part 8 are used to adjust the amount of negative coupling. Specifically, the longer the length, the higher the height , the stronger the negative coupling is, otherwise the weaker the negative coupling is; and adjusting the height and length of the horizontal part of the coupling part 8 is also equivalent to adjusting the length and depth of the blind groove 6, the deeper the blind groove 6 is, the weaker the coupling is, and vice versa .
一般地，盲槽6在横截方向上处于连接处5的中间位置，它离介质谐振器左右两侧壁的距离相等，呈冂型，这是结构上跟实例一不同之处，因此耦合部8水平部分的长度决定了盲槽6的横向位置和形状，即耦合部8水平部分的长度，这一变量的作用就跟实例一的类似。Generally, the blind groove 6 is located in the middle of the joint 5 in the cross-sectional direction, and its distance from the left and right side walls of the dielectric resonator is equal, and it is in the shape of a ridge, which is structurally different from Example 1. Therefore, the coupling part 8 The length of the horizontal part determines the lateral position and shape of the blind groove 6, that is, the length of the horizontal part of the coupling part 8, and the effect of this variable is similar to that of Example 1.
冂型的耦合部8也不可避免地在滤波曲线上形成谐振峰，如上所述，跟实例一类似，调节耦合度8水平部分的长度，可调节谐振峰的频域位置，耦合部8水平部分的高度对此影响很小，同样耦合部8面积也是较大，形成的串联谐振效应的Q值较小，因此谐振峰波峰较低，不会使滤波器抑制性能恶化；秉承相同的设计优化原则，先调节耦合部8水平部分的长度，使谐振峰移至无关频域处，不影响抑制指标，然后调节耦合部8水平部分的高度，使近端抑制指标满足客户需求；这样冂型的耦合部，使盲槽6的横截面积得以扩大，也可以抵挡连接处5介质谐振器之间的耦合作用，减小寄生耦合，得到对称性更好的频率响应曲线，使通带左右抑制高度更加平衡。The coupling part 8 of the 冂 type also inevitably forms a resonant peak on the filter curve. As mentioned above, similar to Example 1, the length of the horizontal part of the degree of coupling 8 can be adjusted to adjust the frequency domain position of the resonant peak. The horizontal part of the coupling part 8 The height of the coupling part has little effect on this, and the area of the coupling part 8 is also relatively large, so the Q value of the formed series resonance effect is small, so the resonance peak is low, and the suppression performance of the filter will not be deteriorated; the same design optimization principle is followed First, adjust the length of the horizontal part of the coupling part 8 to move the resonant peak to an irrelevant frequency domain without affecting the suppression index, and then adjust the height of the horizontal part of the coupling part 8 to make the near-end suppression index meet customer needs; part, so that the cross-sectional area of the blind slot 6 can be expanded, and it can also resist the coupling effect between the 5 dielectric resonators at the connection, reduce the parasitic coupling, obtain a frequency response curve with better symmetry, and make the suppression height of the passband left and right more balance.
从图12可见，在通带附近实例二和实例一的频率响应曲线平衡性和对称性基本一致，但是在通带远端抑制处，实例二谐波峰离通带更远，比实例一高度更低，响应效果更优，抑制余量更大。It can be seen from Figure 12 that the balance and symmetry of the frequency response curves of Example 2 and Example 1 near the passband are basically the same, but at the far-end suppression of the passband, the harmonic peak of Example 2 is farther away from the passband, higher than that of Example 1 Lower, better response, greater suppression margin.
图12中，实线为本发明实施例一的频率响应曲线，虚线为本发明实施例二的频率响应曲线。In FIG. 12 , the solid line is the frequency response curve of Embodiment 1 of the present invention, and the dotted line is the frequency response curve of Embodiment 2 of the present invention.
图13为前后三者的曲线比较图，实线为实例一的频率响应曲线，虚线为实例二频率响应曲线，加粗点画线为现有介质波导滤波器通带频率响应曲线。从图中可见，本发明实施例一和实施例二，频率响应曲线在通带近端的平衡性两者基本一致，且都优于现有介质滤波器频率响应曲线，对称性更佳。而关于谐振峰，本发明实施例一和实施例二，都比现有介质滤波器的高度低，抑制余量更大，综上，抑制余量最大的是实施例二，实施例一次之。Figure 13 is a graph comparing the curves of the three before and after. The solid line is the frequency response curve of Example 1, the dotted line is the frequency response curve of Example 2, and the bold dotted line is the passband frequency response curve of the existing dielectric waveguide filter. It can be seen from the figure that the frequency response curves of Embodiment 1 and Embodiment 2 of the present invention are basically the same at the near end of the passband, and both are better than the existing dielectric filter frequency response curves, with better symmetry. Regarding the resonant peak, the first and second embodiments of the present invention are both lower in height than the existing dielectric filter, and have a larger suppression margin. In summary, the second embodiment has the largest suppression margin, and the second embodiment is second.
综述，本发明的介质谐振器耦合结构，可以有效的减少设计中谐振峰和寄生耦合的影响，保证频率响应曲线良好的平衡性对称性，解决抑制余量不足的问题，同时带来的正面效益，还可以改善插入损耗，减轻通讯系统功耗压力。In summary, the dielectric resonator coupling structure of the present invention can effectively reduce the influence of resonance peaks and parasitic coupling in the design, ensure a good balance and symmetry of the frequency response curve, solve the problem of insufficient suppression margin, and bring positive benefits at the same time , It can also improve the insertion loss and reduce the power consumption pressure of the communication system.
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.
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| CN201910849805.6ACN110444849B (en) | 2019-09-09 | 2019-09-09 | A dielectric resonator negative coupling structure and a dielectric waveguide filter using the same |
| Application Number | Priority Date | Filing Date | Title |
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| CN201910849805.6ACN110444849B (en) | 2019-09-09 | 2019-09-09 | A dielectric resonator negative coupling structure and a dielectric waveguide filter using the same |
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