WO2018161689A1 - 腔体式带阻滤波器及射频器件 - Google Patents

腔体式带阻滤波器及射频器件 Download PDF

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WO2018161689A1
WO2018161689A1 PCT/CN2017/118628 CN2017118628W WO2018161689A1 WO 2018161689 A1 WO2018161689 A1 WO 2018161689A1 CN 2017118628 W CN2017118628 W CN 2017118628W WO 2018161689 A1 WO2018161689 A1 WO 2018161689A1
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cavity
main path
type band
resonant
feeder
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PCT/CN2017/118628
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English (en)
French (fr)
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谢振雄
郭春波
邸英杰
黄友胜
靳雲玺
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京信通信系统（中国）有限公司
京信通信技术(广州)有限公司
京信通信系统（广州）有限公司
天津京信通信系统有限公司
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Publication of WO2018161689A1 publication Critical patent/WO2018161689A1/zh

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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
    • H01P1/207—Hollow waveguide filters
    • 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

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  • the present invention relates to the field of communication device technologies, and in particular, to a cavity type band rejection filter and a radio frequency device using the cavity type band rejection filter.
  • microwave devices composed of band-stop filters have become an indispensable and important component.
  • higher and higher requirements are imposed on the band stop bandwidth, insertion loss, power capacity, device size and cost of the band rejection filter.
  • high-performance band-stop filters usually use a main path feeder plus a parallel resonator.
  • the stop band needs strong suppression, more parallel resonators are needed.
  • the parallel-resonator has a band-stop filter arranged on one side.
  • the distance between the main-path feeders of the two parallel resonators is usually 1/4 wavelength or 1/8 wavelength. This design will cause band-stop filtering.
  • the total length of the device is too long, and the structural design style is single, which is not applicable in the scene with limited size.
  • the present invention proposes a cavity type band rejection filter, which adopts the cavity type band rejection filter of the present invention, which can ensure the processing precision and the unloaded Q value of the parallel resonator, and can shorten the band rejection filter.
  • the length of the device makes the relevant device moderate in length, low in cost and wide in application range.
  • a first aspect of the present invention provides a cavity type band rejection filter, comprising a cavity, a cover plate covering a top surface of the cavity, and an input end connector and an output end connector connected to both ends of the cavity in a longitudinal direction.
  • the cavity is provided with: a main path feeder connected between the input terminal and the output terminal; and a main path feeder cavity accommodating the main path feeder; a plurality of parallel resonators distributed in the main body On both sides of the path feeder cavity, each of the parallel resonators includes a resonant cavity and a resonant column disposed in the resonant cavity, the resonant column extending from the bottom wall of the resonant cavity toward the cover plate; a plurality of coupling branches The coupling branch is connected to the main path feeder and is coupled to the plurality of parallel resonators in one-to-one correspondence.
  • the main path feed line extends in a straight line, and the plurality of parallel resonators are alternately distributed on both sides of the main path feed line in the order of the main path feed line.
  • the coupling branch includes a coupling disk, and an end face of the coupling disk is disposed opposite to a side of the resonant column.
  • the cavity band rejection filter further includes: a partition wall disposed between the adjacent adjacent parallel resonators and located in the main path feeder cavity; the isolation wall is disposed at the bottom of the main path feeder There is a distance from both sides and from the main path feeder.
  • the cavity band rejection filter further includes: a partition wall disposed at a window position between the parallel resonator and the main path feeder; the partition wall is located at two sides and a bottom of the coupling branch And there is a distance from the coupling branch.
  • the length of the main path feeder segment between two adjacent said coupling branches is between 1/4 wavelength and 1/1/2 wavelength, and the length of each segment is the same or different.
  • cross-sectional shapes and sizes of the main guide feeders at different axial positions are the same or different.
  • At least some of the parallel resonators are different in size, and the resonant columns on the same side are on different axes.
  • a gap is formed between the resonant column and the cover plate, and a tuning screw for adjusting the resonant frequency of the parallel resonator is disposed on the cover plate corresponding to the resonant column.
  • the space formed by the resonant cavity is cubic.
  • a second aspect of the invention provides a radio frequency device comprising the cavity band stop filter.
  • the present invention adjusts the distance of the main path feeder between the two parallel resonators by adjusting the impedance of the main path feeder, so that the distance between the main path feeders of the two parallel resonators is 1/4 wavelength and Arbitrarily adjusted within 1/21 wavelength, the flexibility is greatly improved; the arrangement of the parallel resonators on both sides can ensure the processing accuracy of the parallel resonator size and the unloaded Q value, and when the performance reaches the same level as the one-sided arrangement
  • the length of the band-stop filter is greatly shortened, and the disadvantages of large processing difficulty and poor consistency caused by bending or folding line of the main path feeder are also avoided.
  • FIG. 1 is an exploded view of a cavity type band stop filter according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view of the cavity type band stop filter of Figure 1 taken along line A-A' of the present invention
  • Figure 3 is a cross-sectional view of the cavity type band stop filter of Figure 1 taken along line B-B' of the present invention.
  • the present invention provides a cavity type band rejection filter 100 (hereinafter referred to as a "band rejection filter”), including a cavity 101 connected to both sides of the cavity 101 (for example, both ends in the longitudinal direction).
  • the input end connector 102 and the output end connector 103 are provided with a cover plate 104 on the top surface of the cavity 101.
  • the cover plate 104 is fixedly connected to the cavity 101 by screws (not shown) to form a sealed signal transmission. space.
  • the cavity 101 is provided with a main path feeder 11 extending linearly between the input terminal connector 102 and the output terminal connector 103 for receiving the main path feeder.
  • a main path feeder cavity 12 of 11 a main path feeder cavity 12 of 11 , a plurality of parallel resonators 14 distributed on both sides of the main path feed line 11 , and a plurality of coupling branches connected to the main path feed line 11 and coupled to the parallel resonator 14 road.
  • the main via feeder 11 is axially fixed in the main via feeder cavity 12 by two media support members 13 , and the two ends are respectively connected with the input terminal connector 102 and the output terminal connector 103 to form signal path.
  • Each of the coupling branches is for coupling a signal of a corresponding frequency input by the input terminal 102 and transmitted via the main path feeder 11 to a parallel resonator 14 of a corresponding coupled connection to generate within the corresponding parallel resonator 14 The zero point is transmitted to form a transmission stop band between the plurality of parallel resonators 14.
  • the cross section of the main via feeder 11 may take any shape as needed and the cross sections at different axial positions may be different to achieve the adjustment of the impedance of the main path feeder 11 at different positions, thereby
  • the length of the main path feeder segment between adjacent two coupling branches is adjusted by adjusting the impedance of the main path feeder 11; and two adjacent resonators 14 are disposed on both sides of the main path feeder 11 to make two adjacent
  • the length of the main path feeder segment between the coupling branches is adjustable from 1/4 wavelength to 1/21 wavelength.
  • the specific length of each of the main path feeders may be determined according to the size of each of the parallel resonators 14, and the size of the parallel resonators 14 is determined according to the filter requirements, such as the Q value. of.
  • the length of the main path feeder 11 is shortened while the transmission stop band requirement is satisfied, thereby shortening the length of the band rejection filter 100.
  • each of the parallel resonators 14 includes a resonant cavity 141 and a resonant post 142 that extends from the bottom wall of the resonant cavity 141 toward the cover plate 104.
  • the plurality of parallel resonators 14 are alternately distributed on both sides of the main path feeder 11 in the direction of the main path feed line 11 , and the size of each of the parallel resonators 14 may be different.
  • the resonant cavity 141 is a square cavity having an equal length and width (for example, a space formed by the resonant cavity 141 is a cubic shape) from the viewpoint of space utilization and convenience of venting.
  • the resonant column 142 is a hollow cylinder having a certain wall thickness, and the distance between the hollow resonant column 142 and the coupling branch may be different, and the resonant column 142 on the same side may also be different.
  • a gap is formed between the resonant column 142 and the cover plate 104, and a tuning screw for adjusting the resonant frequency of the parallel resonator 14 is disposed on the cover plate 104 at a position corresponding to the resonant column 142 (not shown). ).
  • each of the coupling branches includes a coupling disk 15 that is in one-to-one correspondence with the resonant column 142 and is alternately arranged on both sides of the main path feeder 11 in sequence.
  • the coupling disk 15 may be any shape that is compatible with the side (planar or curved surface, such as a square cylinder or a cylindrical surface) of the resonant column 142.
  • the coupling disk 15 is in the shape of a disk or a square disk.
  • the side of the resonant column 142 is a flat surface.
  • the cavity 101 includes a cavity wall 161 separating two adjacent parallel resonators 14 on the same side, and a partition wall 162 disposed between the adjacent adjacent parallel resonators 14 and located in the main via feeder cavity 12 a partition wall 163 disposed at a window position between the parallel resonator 14 and the main via feeder 11.
  • the partition wall 162 is disposed at the bottom and the sides of the main passage feeder 11 and has a certain distance from the main passage feeder 11 .
  • the partition wall 163 is located at two sides and a bottom of the coupling branch, and has a certain distance from the coupling branch.
  • the implementation of the band rejection filter 100 of the present invention is such that when a transmission signal is input from the input terminal 102, a certain frequency of signal energy is directly coupled to the corresponding parallel resonator 14 through the coupling disk 15 to make the parallel connection.
  • Resonator 14 produces a transmission zero.
  • Each of the parallel resonators 14 generates a transmission zero point, and a plurality of transmission zero points generated by the plurality of parallel resonators 14 are combined to form a transmission stop band, and finally outputted by the output terminal connector 103, that is, a band rejection filter can be realized.
  • a second aspect of the present invention provides a radio frequency device such as a combiner, a duplexer, a filter, etc., the radio frequency device including the above-described band rejection filter 100, which can make the band rejection filter 100 better Play a role and shrink its size.
  • the cavity type band rejection filter of the present invention has the following advantages:
  • the distance between the main path feeders of the two parallel resonators can be 1/4 wavelength and 1/21 wavelength. With any adjustment, the flexibility is greatly improved.
  • the arrangement of the parallel resonators on both sides of the main path feed line can ensure the processing precision and the unloaded Q value of the parallel resonator size, and can shorten the length of the band stop filter, and its performance can be aligned with one side.
  • the same level at the same time, avoids the disadvantages of difficult processing and poor consistency caused by the bending or folding of the main path feeder.

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Abstract

本发明公开了一种腔体式带阻滤波器，包括腔体，覆盖于腔体顶面的盖板，连接于腔体纵长方向两端的输入端接头和输出端接头，腔体内设有：连接在输入端接头和输出端接头之间的主通路馈线和收容主通路馈线的主通路馈线腔；多个并联谐振器，分布于主通路馈线腔的两侧，每一所述并联谐振器包括谐振腔和置于谐振腔内的谐振柱，谐振柱自谐振腔底壁朝盖板方向延伸；多个耦合支路，所述耦合支路连接于主通路馈线，并且与多个并联谐振器一一对应耦合连接。采用本发明所述的腔体式带阻滤波器，既可以保证并联谐振器加工精度和无载Q值，又可以大大缩短带阻滤波器的长度，从而使相关器件长度适中，成本低，适用范围广。

Description

腔体式带阻滤波器及射频器件 技术领域
本发明涉及通信器件技术领域，特别涉及一种腔体式带阻滤波器及采用该腔体式带阻滤波器的射频器件。
背景技术
在现代移动通信技术中，带阻滤波器构成的微波器件已经成为了必不可少的重要组成部分。随着电子信息产业的不断发展，对带阻滤波器的阻带带宽、插入损耗、功率容量、器件尺寸和成本等方面都提出了越来越高的要求。
目前高性能带阻滤波器通常采用主通路馈线加并联谐振器形式，当阻带需要强抑制时，需要采用较多的并联谐振器。为满足信号处理需求，过去并联谐振器单侧排列的带阻滤波器，两并联谐振器之间主通路馈线的距离通常采用1/4波长或1/8波长，此种设计会造成带阻滤波器总长度过长，并且结构设计样式单一，在尺寸受限的场景中不适用。
发明内容
鉴于上述问题，本发明提出了一种腔体式带阻滤波器，采用本发明所述的腔体式带阻滤波器，既可以保证并联谐振器加工精度和无载Q值，又可以缩短带阻滤波器的长度，从而使相关器件长度适中，成本低，适用范围广。
本发明第一方面提供一种腔体式带阻滤波器，包括腔体，覆盖于所述腔体顶面的盖板，连接于所述腔体纵长方向两端的输入端接头和输出端接头，所述腔体内设有：连接在所述输入端接头和所述输出端接头之间的主通路馈线和收容所述主通路馈线的主通路馈线腔；多个并联谐振器，分布于所述主通路馈线腔的两侧，每一所述并联谐振器包括谐振腔和置于谐振腔内的谐振柱，所述谐振柱自所述谐振腔底壁朝所述盖板方向延伸；多个耦合支路，所述耦合支路连接于所述主通路馈线，并且与所述多个并联谐 振器一一对应耦合连接。
优选的，所述主通路馈线沿直线延伸，所述多个并联谐振器沿所述主通路馈线方向依次交替地分布于所述主通路馈线的两侧。
优选的，所述耦合支路包括耦合盘，所述耦合盘的端面正对所述谐振柱的侧面设置。
进一步，所述腔体式带阻滤波器还包括：设置于异侧相邻并联谐振器之间且位于所述主通路馈线腔内的隔离墙；所述隔离墙设在所述主通路馈线的底部与两侧，且与所述主通路馈线存在间距。
进一步，所述腔体式带阻滤波器还包括：设置于所述并联谐振器与所述主通路馈线之间的窗口位置的隔离壁；所述隔离壁位于所述耦合支路的两侧与底部，且与所述耦合支路存在间距。
进一步，相邻两个所述耦合支路之间的主通路馈线段长度在1/4波长至1/21波长之间，且每段的长度相同或不同。
进一步，所述主通路馈线的轴向不同位置处的横截面形状和大小相同或不同。
优选的，至少部分所述并联谐振器的大小不同，并且同侧的所述谐振柱位于不同轴线上。
进一步，所述谐振柱与所述盖板之间设有空隙，所述盖板上对应所述谐振柱设有用于调节所述并联谐振器谐振频率的调谐螺杆。
优选的，所述谐振腔形成的空间为立方体状。
本发明的第二方面提供一种射频器件，所述射频器件包括所述的腔体式带阻滤波器。
相对于现有技术，本发明通过调节主通路馈线的阻抗大小来调节两并联谐振器之间主通路馈线的距离，可以做到两并联谐振器之间主通路馈线的距离在1/4波长和1/21波长内任意调整，灵活性大大提高；并联谐振器两侧排列方式即可以保证并联谐振器尺寸的加工精度和无载Q值，又可以在其性能达到与单侧排列相同的水平时大大缩短带阻滤波器的长度，，同时也避免了主通路馈线弯曲或折线走向所带来的加工难度大、一致性差的缺点。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，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来讲，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他的附图。
图1为本发明一种实施例的腔体式带阻滤波器的分解图；
图2为本发明图1所示腔体式带阻滤波器沿A-A’方向的剖视图；
图3为本发明图1所示腔体式带阻滤波器沿B-B’方向的剖视图。
具体实施方式
为了使本技术领域的人员更好地理解本发明方案，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楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示，本发明提供一种腔体式带阻滤波器100(以下简称“带阻滤波器”)，包括腔体101，连接于所述腔体101两侧(比如纵长方向两端)的输入端接头102和输出端接头103，所述腔体101顶面设置盖板104，所述盖板104通过螺钉(未图示)与所述腔体101固定连接，形成信号传输的密闭空间。
请结合图2和图3，所述腔体101内设有：直线延伸连接在所述输入端接头102和所述输出端接头103之间的主通路馈线11，用于收容所述主通路馈线11的主通路馈线腔12，分布于所述主通路馈线11两侧的多个并联谐振器14，以及连接于所述主通路馈线11且与所述并联谐振器14耦合连接的多个耦合支路。
其中，所述主通路馈线11由两个介质支撑件13沿轴向固定在所述主通路馈线腔12内，且两端分别与所述输入端接头102和所述输出端接头103连接，形成信号通路。每一所述耦合支路用于将由输入端接头102输入并经由主通路馈线11传输的对应频率的信号耦合至对应耦合连接的并联谐振器14内，以在该对 应的并联谐振器14内产生传输零点，进而在多个并联谐振器14之间形成传输阻带。
本发明的带阻滤波器100中，所述主通路馈线11横截面可以根据需要取任意形状且轴向不同位置处的横截面可以不同，以实现主通路馈线11不同位置的阻抗的调节，从而通过调节所述主通路馈线11的阻抗调整相邻两个耦合支路之间的主通路馈线段长度；并通过将多个并联谐振器14设置在主通路馈线11两侧，使相邻两个耦合支路之间的主通路馈线段长度在1/4波长至1/21波长内可调。其中，每段所述主通路馈线的具体长度可根据每个所述并联谐振器14的尺寸而定，而所述并联谐振器14的尺寸是根据滤波器的指标要求，比如其Q值大小决定的。综上，在满足传输阻带需求的前提下缩短所述主通路馈线11的长度，进而缩短所述带阻滤波器100的长度。
如上所述，每一所述并联谐振器14包括一个谐振腔141和一个谐振柱142，所述谐振柱142自所述谐振腔141底壁朝所述盖板104方向延伸。
优选的，所述多个并联谐振器14沿所述主通路馈线11方向依次交替地分布于所述主通路馈线11的两侧，每一所述并联谐振器14的大小均可不同。从空间利用率和方便排腔的角度考虑，优选地，所述谐振腔141为长宽相等的方腔(比如所述谐振腔141形成的空间为立方体状)。
优选的，所述谐振柱142为具有一定壁厚的中空柱体，所述中空的谐振柱142与所述耦合支路的距离可各不相同，同侧的所述谐振柱142还可位于不同轴线上。所述谐振柱142与所述盖板104之间设有空隙，所述盖板104上对应所述谐振柱142的位置设有用于调节所述并联谐振器14谐振频率的调谐螺杆(未图示)。
优选的，每一所述耦合支路包括耦合盘15，所述耦合盘15与所述谐振柱142一一对应，并依次交替地排布于所述主通路馈线11的两侧。所述耦合盘15可以为与所述谐振柱142侧面(平面或曲面，如方柱面或圆柱面)相适应的任意形状，优选地，所述耦合盘15为圆盘状或方盘状，所述谐振柱142侧面为平面。
所述腔体101包括：隔开同侧相邻两个并联谐振器14的腔壁161，设置于异侧相邻并联谐振器14之间且位于所述主通路馈线腔12内的隔离墙 162，设置于所述并联谐振器14与所述主通路馈线11之间的窗口位置的隔离壁163。所述隔离墙162设在所述主通路馈线11的底部与两侧，且与所述主通路馈线11存在一定间距。所述隔离壁163位于所述耦合支路的两侧与底部，且与所述耦合支路存在一定间距。通过所述腔壁161、所述隔离墙162和所述隔离壁163的设置，削弱相邻两所述并联谐振器14之间的耦合，达到阻带强抑制的效果。
本发明的带阻滤波器100的实现原理是：当传输信号由输入端接头102输入时，一定频率的信号能量会通过耦合盘15直接耦合到对应的并联谐振器14上，以使所述并联谐振器14产生传输零点。每一个所述并联谐振器14都会产生一个传输零点，多个并联谐振器14产生的多个传输零点组合起来形成一个传输阻带，最后由输出端接头103输出，即可以实现带阻滤波器的功能。
本发明的第二方面提供一种射频器件，如合路器、双工器、滤波器等，所述射频器件包括上述的带阻滤波器100，可以使所述带阻滤波器100更好地发挥作用，并缩小其体积。
与现有技术相比，本发明所述腔体式带阻滤波器具有以下优点：
(1)通过调节主通路馈线的阻抗大小来调节两并联谐振器之间主通路馈线的距离，可以做到两并联谐振器之间主通路馈线的距离在1/4波长和1/21波长内任意调整，灵活性大大提高。
(2)并联谐振器分布于主通路馈线两侧的排列方式即可以保证并联谐振器尺寸的加工精度和无载Q值，又可以缩短带阻滤波器的长度，其性能可以达到与单侧排列相同的水平，同时也避免了主通路馈线弯曲或折线走向所带来的难加工、一致性差的缺点。
(3)通过在异侧相邻两谐振腔之间的主通路馈线腔内设有隔离墙，在并联谐振器与主通路馈线之间的窗口位置设有隔离壁，以此削弱并联谐振器相邻两腔之间的耦合，达到阻带强抑制的效果。
以上对本发明所提供的腔体式带阻滤波器进行了详细介绍，对于本领域的一般技术人员，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，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (11)

  1. 一种腔体式带阻滤波器，包括腔体，覆盖于所述腔体顶面的盖板，连接于所述腔体纵长方向两端的输入端接头和输出端接头，其特征在于，所述腔体内设有：
    连接在所述输入端接头和所述输出端接头之间的主通路馈线和收容所述主通路馈线的主通路馈线腔；
    多个并联谐振器，分布于所述主通路馈线腔的两侧，每一所述并联谐振器包括谐振腔和置于谐振腔内的谐振柱，所述谐振柱自所述谐振腔底壁朝所述盖板方向延伸；
    多个耦合支路，所述耦合支路连接于所述主通路馈线，并且与所述多个并联谐振器一一对应耦合连接。
  2. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，所述主通路馈线沿直线延伸，所述多个并联谐振器沿所述主通路馈线方向依次交替地分布于所述主通路馈线的两侧。
  3. 根据权利要求2所述的腔体式带阻滤波器，其特征在于，所述耦合支路包括耦合盘，所述耦合盘的端面正对所述谐振柱的侧面设置。
  4. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，还包括：设置于异侧相邻并联谐振器之间且位于所述主通路馈线腔内的隔离墙；所述隔离墙设在所述主通路馈线的底部与两侧，且与所述主通路馈线存在间距。
  5. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，还包括：设置于所述并联谐振器与所述主通路馈线之间的窗口位置的隔离壁；所述隔离壁位于所述耦合支路的两侧与底部，且与所述耦合支路存在间距。
  6. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，相邻两个所述耦合支路之间的主通路馈线段长度在1/4波长至1/21波长之间，且每段的长度相同或不同。
  7. 根据权利要求6所述的腔体式带阻滤波器，其特征在于，所述主通路馈线的轴向不同位置处的横截面形状和大小相同或不同。
  8. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，至少部分所述并联谐振器的大小不同，并且同侧的所述谐振柱位于不同轴线上。
  9. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，所述谐振柱与所述盖板之间设有空隙，所述盖板上对应所述谐振柱设有用于调节所述并联谐振器谐振频率的调谐螺杆。
  10. 根据权利要求1所述的腔体式带阻滤波器，其特征在于，所述谐振腔形成的空间为立方体状。
  11. 一种射频器件，其特征在于，包括：如权利要求1至10任意一项所述的腔体式带阻滤波器。
PCT/CN2017/118628 2017-03-10 2017-12-26 腔体式带阻滤波器及射频器件 WO2018161689A1 (zh)

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