WO2012109807A1 - 一种混合式的tm模介质滤波器 - Google Patents

一种混合式的tm模介质滤波器 Download PDF

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Publication number
WO2012109807A1
WO2012109807A1 PCT/CN2011/071980 CN2011071980W WO2012109807A1 WO 2012109807 A1 WO2012109807 A1 WO 2012109807A1 CN 2011071980 W CN2011071980 W CN 2011071980W WO 2012109807 A1 WO2012109807 A1 WO 2012109807A1
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resonant rod
dielectric ceramic
metal
rod
microwave dielectric
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PCT/CN2011/071980
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English (en)
French (fr)
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吴传志
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成都泰格微波技术股份有限公司
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators

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  • the present invention relates to a hybrid TM mode dielectric filter.
  • TM mode dielectric resonator has the advantages of high quality factor, small loss and small volume, but there is a problem that the high-order mode is close to the signal pass band, and the resonance mode of the metal coaxial cavity is TEM. Mode, its loss is medium, but its nearest high-order mode can easily control three or four times the center frequency.
  • the metal coaxial resonator filter shown in Fig. 1. The biggest feature of this filter is that the resonant rod inside each coaxial resonant cavity is a silver-plated metal resonant rod.
  • This type of structure is simple and the filter arrangement is arranged. Convenient, the relative bandwidth can reach more than 20%, and it is easy to construct a quasi-elliptic function filter waveform, and its own higher-order harmonics are generally 3 Times and 4 More than one time, and widely used in mobile communication base stations, repeaters and indoor coverage networks.
  • the quality factor of the metal coaxial resonator filter is generally between 3000 and 4500, the insertion loss increases as the number of filter stages increases. At this time, the volume of the filter is large and cannot be satisfied. New requirements for future base station filters.
  • the microwave dielectric ceramic dielectric resonator filter shown in Fig. 2 the resonant rod materials in the resonant cavity are all microwave dielectric ceramics, and the low dielectric constant and low loss characteristics of the microwave dielectric ceramic are used to construct a low-insertion type. Loss filter.
  • the disadvantages of the cavity filter for microwave dielectric ceramic resonators are: (1) TM The most recent high-order modes of the full-mode resonator filter are generally within the 2nd harmonic; (2) due to TM The special input-output excitation loop structure of the all-dielectric resonator filter has a relative bandwidth of 2% to 3%, and cannot be made into a wideband filter.
  • the conventional hybrid resonator filter uses a coaxial metal resonator for the input and output resonators, and a microwave dielectric ceramic resonator for the other resonators, using the similarity of the magnetic field distribution of the two resonance modes.
  • the resonant cavity is easy to form a new type of mixed mode dielectric filter, and combines the advantages of each of the two resonant cavities, such as low insertion loss, high-order mode, simple structure, and convenient use.
  • this kind of hybrid TM Mode dielectric filter Because the microwave dielectric ceramic resonant rod is a uniform cylinder, the height of the filter is very high, which cannot meet the requirements of miniaturization of the current communication base station filter.
  • the object of the present invention is to overcome the deficiencies of the prior art resonator filter and to provide a cavity filter having low insertion loss, wide bandwidth, low occupied height, and small volume.
  • a hybrid TM mode dielectric filter comprising a cover plate, a cavity shell, a radio frequency connector, a metal resonant rod and a microwave dielectric ceramic resonant rod, and the cover plate passes through the disc
  • the head combination screw is fixed on the cavity shell, two metal resonance rods are arranged at two ends of the cavity shell, at least one microwave dielectric ceramic resonance rod is arranged between the metal resonance rods, and the RF connector is installed at both ends of the cavity shell,
  • the metal resonant rod is connected to the RF connector through the excitation line, the metal resonant rod is fixed to the bottom of the inner wall of the cavity by a countersunk screw, the microwave dielectric ceramic rod is welded on the mounting base, and the mounting base is fixed on the inner wall of the cavity
  • the top of the microwave dielectric ceramic resonant rod is provided with a top dielectric loading disc, the edge of the top dielectric loading disc is rounded, and a silver plated screw is
  • the quality factor of the mixed mode TM mode dielectric filter of the present invention is more than 50% higher, so the insertion loss of such a hybrid TM mode dielectric filter is reduced by more than one third.
  • the volume of the mixed mode TM mode dielectric filter of the present invention will be reduced by more than half, while the technical specifications remain unchanged.
  • the mixed mode TM mode dielectric filter of the present invention uses a metal coaxial resonant cavity for the input and output resonant cavity, and the microwave dielectric ceramic resonant cavity can be used to increase the relative bandwidth to more than 10%.
  • the present invention can be easily applied to the same type of miniaturized TM mode dielectric duplexer and multiplexer structure.
  • FIG. 1 Schematic diagram of the structure of a metal coaxial resonator filter
  • FIG. 2 Schematic diagram of the microwave dielectric ceramic dielectric resonator filter
  • FIG. 3 Schematic diagram of the structure of a conventional hybrid resonator filter
  • FIG. 4 Schematic diagram of the mixed mode TM mode dielectric filter
  • a hybrid TM mode dielectric filter includes a cover plate 1, a cavity shell 2, a radio frequency connector 3, a metal resonant rod 4, and
  • the microwave dielectric ceramic resonant rod 5 the cover plate 1 and the cavity shell 2 are both made of silver plated material, and the cover plate 1 is fixed on the cavity shell 2 by the pan head combination screw 6, and the input and output resonant cavities at both ends of the cavity shell 2 are respectively provided with a silver-plated metal resonant rod 4, each of which is provided with a microwave dielectric ceramic resonant rod 5, the RF connector 3 is mounted at both ends of the cavity shell 2, and the silver-plated metal resonant rod 4 passes through the excitation line 7 and the RF
  • the connector 3 is connected, the metal resonant rod 4 is fixed to the bottom of the inner wall of the cavity 2 by the countersunk set screw 8, the mounting base 9 is fixed to the bottom of the inner wall of the cavity 2, and
  • the input and output resonant cavity of the filter adopts the silver-plated metal resonant rod 4, which can increase the relative bandwidth of the dielectric filter to more than 10%; the microwave in the remaining resonant cavity Dielectric ceramic resonant rod
  • the use of 5 makes the quality factor of the filter more than 50% higher under the premise that the structural size remains unchanged, so the insertion loss is reduced by more than one third; the top of the microwave dielectric ceramic resonator rod 5 is provided with the top medium.
  • the loading disk structure can effectively reduce the height of the filter under the premise of ensuring the loss and harmonic characteristics of the resonator; the edge 13 of the top dielectric loading disk 12 is rounded, further ensuring miniaturization of TM
  • the power capacity of the mode dielectric filter; each of the metal resonant rod 4 and the cover plate 1 above the dielectric ceramic resonant rod 5 is provided with a silver plated screw 10, and the silver plated screw 10 is sleeved with a nut 11 and a rotating silver plated screw 10
  • the distance between the silver plated screw 10 and the resonant rod can be adjusted; the present invention can be easily applied to the same type of miniaturized TM mode dielectric duplexer and multiplexer structure.

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Abstract

本发明公开了一种混合式的TM模介质滤波器，它包括盖板（1）、腔壳（2）、射频连接器（3）、金属谐振杆（4）和微波介质陶瓷谐振杆（5），腔壳（2）内两端设置有两个金属谐振杆（4），金属谐振杆（4）之间至少设有一个微波介质陶瓷谐振杆（5），微波介质陶瓷谐振杆（5）焊接在安装基座（9）上，微波介质陶瓷谐振杆（5）的顶部设置有顶部介质加载盘（12），顶部介质加载盘（12）的棱边（13）为倒圆角，每个金属谐振杆（4）和微波介质陶瓷谐振杆（5）的上方的盖板（1）上设置有镀银螺钉（10）。本发明具有插入损耗低、品质因数高、带宽较宽、占用高度低、体积小等优势。

Description

一种混合式的TM模介质滤波器 技术领域
本发明涉及一种混合式的TM模介质滤波器。
背景技术
随着3G 移动通讯网络服务的投入使用，未来3.5G、4G移动通讯技术的研发也在紧锣密鼓地进行，作为移动基站射频前端关键器件的收发滤波器，其性能的好坏直接影响通讯的质量。
传统的金属同轴谐振腔滤波器已经无法满足将来技术发展的需要，介质滤波器由于具有体积小、插入损耗低和承受功率大等特点，越来越得到射频工程师的重视。TM模介质谐振腔具有品质因数高、损耗小和体积小等优点，但存在高次模靠近信号通带的问题，而金属同轴谐振腔的谐振模式为TEM 模，其损耗中等，但其最近的高次模可以很方便地控制三倍或四倍中心频率以外。
传统的谐振腔滤波器有以下三种：
1、如图1所示的金属同轴谐振腔滤波器，这种滤波器的最大特点是每个同轴谐振腔内部的谐振杆为镀银金属谐振杆，此类结构简单，滤波器排布方便，相对带宽最大可以达到20%以上,并且很容易构造出准椭圆函数滤波波形，其自身的高阶谐波一般在3 次和4 次以上，并广泛应用于移动通讯基站、直放站和室内覆盖网络中。但是由于金属同轴谐振腔滤波器的品质因数一般在3000～4500之间，随着滤波器级数的增加，其插入损耗也随之增大，此时滤波器的体积较大，已经无法满足未来日新月异基站滤波器新的要求。
2、如图2所示的微波介质陶瓷介质谐振腔滤波器，谐振腔中的谐振杆材料全部为微波介质陶瓷，利用微波介质陶瓷的高介电常数，低损耗特性，构造出一类低插入损耗的滤波器。微波介质陶瓷谐振杆类的谐振腔滤波器的缺点是：（1）TM 模全介质谐振腔滤波器最近的高阶模一般在2 次谐波以内；（2）由于TM 模全介质谐振腔滤波器特殊的输入输出激励环结构，其相对带宽一般在2%～3%以内，无法做成宽带滤波器。
3、如图3所示的传统混合式谐振腔滤波器，输入输出谐振腔采用同轴金属谐振腔，其余谐振腔采用微波介质陶瓷介质谐振腔，利用两者谐振模式的磁场分布相似性，两种谐振腔很容易组成一类新型的混合模式介质滤波器，并且结合了两种谐振腔各自的优点，如插入损耗低、高阶模远，结构简单，使用方便等。但该类混合TM 模介质滤波器由于微波介质陶瓷谐振杆为均匀圆柱，滤波器的高度都很高，无法满足目前通讯基站滤波器小型化的要求。
 技术问题
本发明的发明目的在于克服现有谐振腔滤波器的不足，提供一种具有插入损耗低、带宽较宽、占用的高度低且体积小等特点的谐振腔滤波器。
 技术解决方案
本发明的发明目的是通过以下技术方案实现的：一种混合式的TM模介质滤波器，它包括盖板、腔壳、射频连接器、金属谐振杆和微波介质陶瓷谐振杆，盖板通过盘头组合螺钉固定在腔壳上，腔壳内两端设置有两个金属谐振杆，金属谐振杆之间至少设有一个微波介质陶瓷谐振杆，射频连接器安装在腔壳的两个端头，金属谐振杆通过激励线与射频连接器连接，金属谐振杆通过沉头紧定螺钉固定在腔壳的内壁底部，微波介质陶瓷谐振杆焊接在安装基座上，安装基座固定在腔壳的内壁底部，微波介质陶瓷谐振杆的顶部设置有顶部介质加载盘，顶部介质加载盘的棱边为倒圆角，每个金属谐振杆和微波介质陶瓷谐振杆的上方的盖板上设置有镀银螺钉，镀银螺钉上套有螺母。
 有益效果
本发明的有益效果包括：
（1）与标准的金属同轴谐振腔滤波器相比，在结构尺寸保持不变的前提下， 本发明所述的混合模式的TM模介质滤波器的品质因数要高出50%以上，因此此类混合式TM模介质滤波器的插入损耗降低三分之一以上。
（2）与标准的金属同轴谐振腔滤波器相比，在技术指标保持不变的前提下，本发明所述的混合模式的TM模介质滤波器的体积将减少一半以上。
（3）本发明所述的混合模式的TM模介质滤波器的输入、输出谐振腔采用金属同轴谐振腔，其余使用微波介质陶瓷谐振腔，可以使其相对带宽增至10%以上。
（4）与传统的混合式谐振腔滤波器相比，本发明所述的混合模式的TM模介质滤波器的高度得到有效地降低。
（5）本发明可以很方便地推广应用到同类的小型化TM 模介质双工器和多工器结构当中。
 附图说明
图1 金属同轴谐振腔滤波器的结构示意图
图2 微波介质陶瓷介质谐振腔滤波器的结构示意图
图3 传统混合式谐振腔滤波器的结构示意图
图4 混合模式的TM模介质滤波器的结构示意图
图中，1-盖板，2-腔壳，3-射频连接器，4-金属谐振杆，5-微波介质陶瓷谐振杆，6-盘头组合螺钉，7-激励线，8-沉头紧定螺钉，9-安装基座，10-镀银螺钉，11-螺母，12-顶部介质加载盘，13-棱边。
 本发明的实施方式
下面结合附图进一步详细说明本发明的技术方案：如图4所示，一种混合式的TM模介质滤波器，它包括盖板1、腔壳2、射频连接器3、金属谐振杆4和微波介质陶瓷谐振杆5，盖板1与腔壳2都采用镀银材料，盖板1通过盘头组合螺钉6固定在腔壳2上，腔壳2两端的输入、输出谐振腔内各设置有一个镀银金属谐振杆4，其余谐振腔内各设置有一个微波介质陶瓷谐振杆5，射频连接器3安装在腔壳2的两个端头，镀银金属谐振杆4通过激励线7与射频连接器3连接，金属谐振杆4通过沉头紧定螺钉8固定腔体2的内壁底部，安装基座9固定在腔壳2的内壁底部，微波介质陶瓷谐振杆5焊接在安装基座9上，可以承受严酷的环境温度冲击，确保结构的可靠性；滤波器的输入、输出谐振腔采用镀银金属谐振杆4，可以使介质滤波器的相对带宽增至10%以上；其余谐振腔中微波介质陶瓷谐振杆5的使用，使得在结构尺寸保持不变的前提下，滤波器的品质因数要高出50%以上，因此插入损耗降低了三分之一以上；微波介质陶瓷谐振杆5的顶部设置有顶部介质加载盘12，加载盘结构可以在保证谐振器的损耗和谐波特性的前提下，有效地降低了滤波器的高度；顶部介质加载盘12的棱边13为倒圆角，进一步保证小型化TM模介质滤波器的功率容量；每个金属谐振杆4和介质陶瓷谐振杆5的上方的盖板1上设置有镀银螺钉10，镀银螺钉10上套接有螺母11，旋转镀银螺钉10可以调节镀银螺钉10与谐振杆之间的距离；本发明可以很方便地推广应用到同类的小型化TM模介质双工器和多工器结构当中。

Claims (1)

1、一种混合式的TM模介质滤波器，其特征在于：它包括盖板（1）、腔壳（2）、射频连接器（3）、金属谐振杆（4）和微波介质陶瓷谐振杆（5），盖板（1）通过盘头组合螺钉（6）固定在腔壳（2）上，腔壳（2）内两端设置有两个金属谐振杆（4），金属谐振杆（4）之间至少设有一个微波介质陶瓷谐振杆（5），射频连接器（3）安装在腔壳（2）的两个端头，金属谐振杆（4）通过激励线（7）与射频连接器（3）连接，金属谐振杆（4）通过沉头紧定螺钉（8）固定在腔壳（2）的内壁底部，微波介质陶瓷谐振杆（5）焊接在安装基座（9）上，安装基座（9）固定在腔壳（2）的内壁底部，微波介质陶瓷谐振杆（5）的顶部设置有顶部介质加载盘（12），顶部介质加载盘（12）的棱边（13）为倒圆角，每个金属谐振杆（4）和微波介质陶瓷谐振杆（5）的上方的盖板（1）上设置有镀银螺钉（10），镀银螺钉（10）上套有螺母（11）。
PCT/CN2011/071980 2011-02-18 2011-03-20 一种混合式的tm模介质滤波器 WO2012109807A1 (zh)

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