WO2015003652A1 - 一种dbr滤波器及dbr双工器 - Google Patents

一种dbr滤波器及dbr双工器 Download PDF

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Publication number
WO2015003652A1
WO2015003652A1 PCT/CN2014/082036 CN2014082036W WO2015003652A1 WO 2015003652 A1 WO2015003652 A1 WO 2015003652A1 CN 2014082036 W CN2014082036 W CN 2014082036W WO 2015003652 A1 WO2015003652 A1 WO 2015003652A1
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Prior art keywords
dbr
filter
duplexer
coupling
resonant cavities
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PCT/CN2014/082036
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English (en)
French (fr)
Inventor
苏涛
茹洪涛
王盛杰
张青青
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中兴通讯股份有限公司
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Publication of WO2015003652A1 publication Critical patent/WO2015003652A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/201Filters for transverse electromagnetic waves
    • H01P1/203Strip line filters
    • H01P1/2039Galvanic coupling between Input/Output

Definitions

  • the present invention relates to a duplexer technology, and in particular to a dual-Behavior Resonator (DBR) filter and a DBR duplexer.
  • DBR dual-Behavior Resonator
  • duplexers are: waveguide duplexers, coaxial duplexers, stripline duplexers, microstrip duplexers, dielectric duplexers, and the like.
  • the duplexer consists of a bandpass filter and a branching connector.
  • the main structures of the microstrip filter and duplexer include: Stepped Impedance Resonator (SIR) structure, DBR structure and Open-loop Resonator (OL) structure.
  • SIR Stepped Impedance Resonator
  • DBR structure uses a parallel double-branch cavity to obtain an out-of-band finite-transmission zero-point narrow-band filter, which increases out-of-band rejection and frequency selectivity.
  • the parallel branches can use a 1/4 wavelength transmission line, or an SIR structure, to form a limited transmission zero point at the high end and the low end stop band, respectively.
  • DBR-based duplexers have the advantage of high isolation, but the structure of the parallel double-branched sections tends to be too large, which imposes significant limitations on their application. Summary of the invention
  • the embodiments of the present invention provide a DBR filter and a DBR duplexer, which can greatly reduce the size of the DBR filter and the DBR duplexer under the premise of the passband requirement.
  • the technical solution of the embodiment of the present invention is implemented as follows:
  • An embodiment of the present invention provides a DBR filter, where the DBR filter includes: a coupling unit and a DBR resonant cavity, and two adjacent DBR resonant cavities are connected in series by a coupling unit;
  • the DBR resonant cavity comprises: a DBR single-side branch and a compensation unit, DBR single-side branches of all DBR resonators are disposed on the same side of all DBR resonators, and compensation units of all DBR resonators are disposed in the DBR resonator One side.
  • the coupling unit is a coupling line that sets a coupling line between adjacent DBR resonators to a shape that is adapted to a center frequency of a pass band of the DBR filter and a coupling strength of the DBR filter.
  • the compensation unit is an inductive element.
  • the inductive component comprises: a short circuit, or a lumped inductance.
  • the compensation unit is a capacitive element.
  • the capacitive element comprises: an open path, or a lumped capacitance.
  • An embodiment of the present invention further provides a DBR duplexer, where the duplexer includes a DBR filter; the DBR filter includes: a coupling unit and a DBR resonant cavity, and two adjacent DBR resonant cavities pass through a coupling unit string Connect
  • the DBR resonant cavity comprises: a DBR single-side branch and a compensation unit, DBR single-side branches of all DBR resonators are disposed on the same side of all DBR resonators, and compensation units of all DBR resonators are disposed in another DBR resonator side.
  • the coupling unit is a coupling line that sets a coupling line between adjacent DBR resonators to a shape that is adapted to a center frequency of a pass band of the DBR filter and a coupling strength of the DBR filter.
  • the compensation unit is an inductive element.
  • the inductive component comprises: a short circuit, or a lumped inductance.
  • the compensation unit is a capacitive element.
  • the capacitive element comprises: an open path, or a lumped capacitance.
  • the compensation unit of the DBR filter of the receiving end of the duplexer is a short circuit; or a lumped inductance.
  • the compensation unit of the DBR filter of the transmitting end of the duplexer is an open circuit; or a lumped capacitor.
  • the DBR filter includes: a coupling unit and at least one DBR resonant cavity, wherein the at least one DBR resonant cavity is connected in series through the coupling unit;
  • the cavity includes: a DBR single-sided branch and a compensation unit, all DBR single-side branches of the at least one DBR resonator are disposed on one side of the coupling unit, and all compensation units of the at least one DBR resonator are disposed on the coupling The other side of the unit.
  • the passband requirement of the DBR filter is ensured, and the size of the DB filter is only half the size of the original DBR filter, which greatly reduces the DBR.
  • the size of the filter and DBR duplexer is better and the isolation is better.
  • FIG. 1 is a schematic structural diagram of a DBR filter according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a receiving end of a DBR duplexer according to an embodiment of the present invention
  • FIG. 3 is a DBR duplexer according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of the response of the DBR duplexer according to an embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a DBR filter according to an embodiment of the present invention.
  • the DBR filter includes: a coupling unit 12 and a DBR resonant cavity 11 , and two adjacent DBR resonant cavities 11 pass through a coupling unit. 12 series;
  • the DBR resonator 11 includes: a DBR single-sided branch 111 and a compensation unit 112, all The DBR one-side branch 111 of the DB resonator 11 is disposed on the same side of all the DBR resonators 11, and the compensation unit 112 of all the DBR resonators 11 is disposed on the other side of all the DBR resonators 11.
  • the coupling unit 12 is a coupling line; the embodiment of the present invention sets a coupling line between adjacent DBR resonators 11 to a center frequency of the pass band of the DBR filter and the The shape of the coupling strength of the DBR filter is adapted.
  • the shape of the DBR filter according to the embodiment of the present invention is similar to a fishbone structure, the DBR resonant cavity 11 is connected in series by the coupling line, and the DBR one-side branch of the DBR resonant cavity 11 is specifically 111 and the compensation unit 112 are respectively disposed on two sides of the coupling line, and all DBR single-side branches 111 are disposed on the same side of the coupling line; correspondingly, all the compensation units 112 are disposed on the coupling line The other side of the DBR; and the DBR single-sided branch 111 and the compensation unit 112 are - corresponding.
  • the length and the width of the coupling line are related to the center frequency of the pass band of the DBR filter and the coupling strength of the DBR filter. Specifically, the larger the center frequency, the longer the length of the coupling line Short; the wider the bandwidth, the smaller the width of the coupling line.
  • the compensation unit 112 is an inductive element or a capacitive element.
  • the inductive component comprises: a short circuit, or a lumped inductance.
  • the capacitive element comprises: an open path, or a lumped capacitance.
  • the two parallel DB branches of the original DBR resonant cavity are only reserved on one side, and the other side uses a miniaturized compensation unit, specifically an open route structure or a short-circuit line structure, or a lumped Inductance or lumped capacitance, in short, a miniaturized inductive component is provided at the branch where the inductive component is required, a miniaturized capacitive component is provided at the branch where the capacitive component is required, the transmission zero point on one side is reserved, and the DBR is Reasonable design of the side branch and compensation unit, package
  • the length, the width, the length, the width of the opening route, and/or the length, the width, and the like of the short-circuiting line are reasonably configured, and can be combined with the original two parallel DBR branches.
  • the DBR resonator maintains the same attenuation point position, guarantees passband requirements, and reduces the size of the DBR filter to half the size of the original DBR filter, greatly reducing the size
  • the embodiment of the present invention further provides a DBR duplexer, where the DBR duplexer includes the above-mentioned DBR filter, and the composition of the DBR filter may be specifically as shown in FIG. 1 , and the DBR filter includes: Unit 12 and DBR resonator 11, adjacent two DBR resonators 11 are connected in series by a coupling unit 12;
  • the DBR resonator 11 includes: a DBR single-side branch 111 and a compensation unit 112. DBR single-side branches 111 of all DB resonators 11 are disposed on the same side of all DBR resonators 11, and all compensation units 112 of all DBR resonators 11 It is disposed on the other side of all DBR resonators 11.
  • the coupling unit 12 is a coupling line; the embodiment of the present invention sets a coupling line between adjacent DBR resonators 11 to a center frequency of the pass band of the DBR filter and the The shape of the coupling strength of the DBR filter is adapted.
  • the shape of the DBR filter according to the embodiment of the present invention is similar to a fishbone structure, the DBR resonant cavity 11 is connected in series by the coupling line, and the DBR one-side branch of the DBR resonant cavity 11 is specifically 111 and the compensation unit 112 are respectively disposed on two sides of the coupling line, and all DBR single-side branches 111 are disposed on the same side of the coupling line; correspondingly, all the compensation units 112 are disposed on the coupling line The other side of the DBR; and the DBR single-sided branch 111 and the compensation unit 112 are - corresponding.
  • the length and the width of the coupling line are related to the center frequency of the pass band of the DBR filter and the coupling strength of the DBR filter. Specifically, the larger the center frequency, the longer the length of the coupling line Short; the wider the bandwidth, the smaller the width of the coupling line.
  • the compensation unit 112 is an inductive element or a capacitive element.
  • the inductive component comprises: a short circuit, or a lumped inductance.
  • the capacitive element comprises: an open path, or a lumped capacitance.
  • the compensation unit of the DBR filter at the receiving end of the DBR duplexer is a short-circuit line; or is a lumped inductor.
  • a DBR filter at a receiving end of the DBR duplexer includes two DBR resonant cavities 21, and the DBR resonant
  • the cavity 21 includes a DBR single-side branch 211, and one end of the DBR single-side branch 211 is grounded;
  • the DBR resonators 21 are connected by a coupling line 22, and the length and width of the coupling line can be set according to the coupling strength and the center frequency.
  • the length and the width of the single-side branch 211 of the DBR may be set according to the transmission frequency and the position of the transmission zero. The lower the transmission frequency, the longer the length of the single-side branch 211 of the DBR.
  • the compensation unit of the DBR filter at the transmitting end of the DBR duplexer is an open path; or is a lumped capacitor.
  • FIG. 3 is a schematic structural diagram of a transmitting end of a DBR duplexer according to an embodiment of the present invention.
  • a DBR filter of a transmitting end of the DBR duplexer includes two DBR resonant cavities 31, and the DBR resonant
  • the cavity 31 includes a DBR single-side branch 311, and one end of the DBR single-side branch 311 is an open circuit structure;
  • the DBR resonators 31 are connected by a coupling line 32.
  • the length and width of the coupling line can be set according to the coupling strength and the center frequency. The larger the center frequency, the length of the coupling line. The shorter the bandwidth of the coupling strength, the smaller the width of the coupled line;
  • the length and the width of the single-side branch 211 of the DBR may be set according to the transmission frequency and the position of the transmission zero. The lower the transmission frequency, the longer the length of the single-side branch 211 of the DBR.
  • the receiving end of the DBR duplexer as shown in FIG. 2 and the transmitting end of the DBR duplexer shown in FIG. 3 are connected together, and the DBR duplex crying is obtained through additional matching adjustment. .
  • FIG. 4 is a schematic diagram of a response of a DBR duplexer according to an embodiment of the present invention.
  • the response diagram is simulated according to the receiving end of the DBR duplexer shown in FIG. 2 and the transmitting end of the DBR duplexer described in FIG. Out.
  • FIG. 4 shows gain characteristics of a transmit (Tx) channel and a receive (Rx) channel as a function of frequency; wherein the Tx channel and the Rx channel form two transmission zeros, and the transmission The zero point is at the opposite channel passband, which improves isolation.
  • the DBR single-side branch and the miniaturized compensation unit are reserved, which not only ensures the passband requirement of the DBR filter, but also makes the DBR filter only half the size of the original DBR filter, and greatly reduces the size.
  • the size of the DBR filter and the DBR duplexer are better and the isolation is better.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

本发明实施例公开了一种DBR滤波器,所述DBR滤波器包括:耦合单元和DBR谐振腔,相邻两个DBR谐振腔通过耦合单元串接;所述DBR谐振腔包括:DBR单侧枝节和补偿单元,所有DBR谐振腔的DBR单侧枝节设置于所有DBR谐振腔的同一侧,所有DBR谐振腔的补偿单元设置于所有DBR谐振腔的另一侧。本发明实施例同时还公开了一种DBR双工器。

Description

一种 DBR滤波器及 DBR双工器 技术领域
本发明涉及双工器技术, 具体涉及一种双重行为谐振 ( DBR, Dual-Behavior Resonator )滤波器及 DBR双工器。 背景技术
随着通信技术的发展, 对滤波器及双工器提出了越来越高的要求。
目前, 双工器的主要种类有: 波导双工器、 同轴双工器、 带状线双工 器、 微带双工器、 介质双工器等。 一般情况下, 双工器由带通滤波器和分 支接头组成, 这些双工器都有各自的优点, 也有各自的缺陷。 但随着射频 电路集成化程度越来越高, 除了性能的要求外, 还提出了低损耗、 小体积 和低成本等要求, 因此, 微带滤波器及双工器越来越受到青睐。
目前微带滤波器及双工器的主要结构包括: 阶梯阻抗(SIR, Stepped Impedance Resonator ) 结构、 DBR 结构及开路环谐振 ( OL , Open-loop Resonator )结构等等。 其中, DBR结构釆用并联双枝节谐振腔得到带外有 限传输零点窄带滤波器, 增加了带外抑制和频率选择性。 一般的, 并联枝 节可以釆用 1/4波长传输线,或者 SIR结构,在高端和低端阻带分别形成有 限传输零点。 基于 DBR双工器具有高隔离的优点, 但并联双枝节的结构的 体积往往过大, 这对其应用带来极大的限制。 发明内容
为解决现有存在的技术问题, 本发明实施例提供一种 DBR 滤波器及 DBR双工器, 能够在通带要求的前提下, 大大减小 DBR滤波器及 DBR双 工器的尺寸。 为达到上述目的, 本发明实施例的技术方案是这样实现的:
本发明实施例提供了一种 DBR滤波器, 所述 DBR滤波器包括: 耦合 单元和 DBR谐振腔, 相邻两个 DBR谐振腔通过耦合单元串接;
所述 DBR谐振腔包括: DBR单侧枝节和补偿单元, 所有 DBR谐振腔 的 DBR单侧枝节设置于所有 DBR谐振腔的同一侧,所有 DBR谐振腔的补 偿单元设置于所述 DBR谐振腔的另一侧。
优选地, 所述耦合单元为耦合线, 将相邻 DBR谐振腔之间的耦合线设 置为与所述 DBR滤波器的通带的中心频率及所述 DBR滤波器的耦合强度 适配的形状。
优选地, 所述补偿单元为感性元件。
优选地, 所述感性元件包括: 短路线, 或集总电感。
优选地, 所述补偿单元为容性元件。
优选地, 所述容性元件包括: 开路线, 或集总电容。
本发明实施例还提供了一种 DBR双工器, 所述双工器包括 DBR滤波 器; 所述 DBR滤波器包括: 耦合单元和 DBR谐振腔, 相邻两个 DBR谐振 腔通过一个耦合单元串接;
所述 DBR谐振腔包括: DBR单侧枝节和补偿单元, 所有 DBR谐振腔 的 DBR单侧枝节设置于所有 DBR谐振腔的同一侧,所有 DBR谐振腔的补 偿单元设置于所有 DBR谐振腔的另一侧。
优选地, 所述耦合单元为耦合线, 将相邻 DBR谐振腔之间的耦合线设 置为与所述 DBR滤波器的通带的中心频率及所述 DBR滤波器的耦合强度 适配的形状。
优选地, 所述补偿单元为感性元件。
优选地, 所述感性元件包括: 短路线, 或集总电感。
优选地, 所述补偿单元为容性元件。 优选地, 所述容性元件包括: 开路线, 或集总电容。
优选地, 所述双工器的接收端的 DBR滤波器的补偿单元为短路线; 或 者为集总电感。
优选地, 所述双工器的发射端的 DBR滤波器的补偿单元为开路线; 或 者为集总电容。
本发明实施例提供的 DBR滤波器及 DBR双工器,所述 DBR滤波器包 括: 耦合单元和至少一个 DBR谐振腔, 所述至少一个 DBR谐振腔通过所 述耦合单元串接; 所述 DBR谐振腔包括: DBR单侧枝节和补偿单元, 所述 至少一个 DBR谐振腔的所有 DBR单侧枝节设置于所述耦合单元的一侧, 所述至少一个 DBR谐振腔的所有补偿单元设置于所述耦合单元的另一侧。 如此, 通过仅保留 DBR单侧枝节以及小型化的补偿单元, 既保证了 DBR 滤波器的通带要求, 又使得 DB 滤波器的尺寸仅为原有 DBR滤波器尺寸 的一半, 大大减小了 DBR滤波器及 DBR双工器的尺寸, 且隔离性更好。 附图说明
图 1为本发明实施例提供的 DBR滤波器的组成结构示意图; 图 2为本发明实施例提供的 DBR双工器的接收端的版图结构示意图; 图 3为本发明实施例提供的 DBR双工器的发射端的版图结构示意图; 图 4为本发明实施例提供的 DBR双工器的响应示意图。 具体实施方式
下面结合附图及具体实施例对本发明再作进一步详细的说明。
图 1为本发明实施例提供的 DBR滤波器的组成结构示意图, 如图 1所 示,所述 DBR滤波器包括:耦合单元 12和 DBR谐振腔 11,相邻两个 DBR 谐振腔 11通过耦合单元 12串接;
所述 DBR谐振腔 11 包括: DBR单侧枝节 111和补偿单元 112, 所有 DB 谐振腔 11的 DBR单侧枝节 111设置于所有 DBR谐振腔 11的同一侧, 所有 DBR谐振腔 11的补偿单元 112设置于所有 DBR谐振腔 11的另一侧。
依据本发明实施例的一个方面, 所述耦合单元 12为耦合线; 本发明实 施例将相邻 DBR谐振腔 11之间的耦合线设置为与所述 DBR滤波器通带的 中心频率及所述 DBR滤波器的耦合强度适配的形状。
具体的,本发明实施例所述的 DBR滤波器的形状近似于一个鱼骨结构, 所述 DBR谐振腔 11通过所述耦合线串接在一起,并且所述 DBR谐振腔 11 的 DBR单侧枝节 111和所述补偿单元 112分别设置于所述耦合线的两侧, 并且所有的 DBR单侧枝节 111设置于所述耦合线的同一侧; 相应的, 所有 的补偿单元 112设置于所述耦合线的另一侧;并且,所述 DBR单侧枝节 111 和所述补偿单元 112是——相对应的。
并且, 所述耦合线的长度及宽度与所述 DBR滤波器的通带的中心频率 及所述 DBR滤波器的耦合强度有关; 具体的, 所述中心频率越大, 所述耦 合线的长度越短; 带宽越宽, 所述耦合线的宽度越小。
依据本发明实施例的另一个方面, 所述补偿单元 112 为感性元件或容 性元件。
依据本发明实施例的另一个方面, 所述感性元件包括: 短路线, 或集 总电感。
依据本发明实施例的另一个方面, 所述容性元件包括: 开路线, 或集 总电容。
具体的, 本发明实施例将原有的 DBR谐振腔的两个并联 DB 枝节仅 保留一侧, 另一侧釆用小型化的补偿单元, 具体为开路线结构或短路线结 构, 或者为集总电感或集总电容, 总之, 在需要感性元件的枝节处设置小 型化的感性元件, 在需要容性元件的枝节处设置小型化的容性元件, 保留 一侧的传输零点, 并且通过对 DBR单侧枝节及补偿单元的合理的设计, 包 括对所述 DBR单侧枝节的长度、 宽度, 所述开路线的长度、 宽度, 和 /或所 述短路线的长度、 宽度等参数的合理配置, 能够与原有的两个并联 DBR枝 节的 DBR谐振腔保持有相同的衰减点位置, 保证通带要求, 并且使 DBR 滤波器的尺寸减小为原有的 DBR滤波器尺寸的一半, 大大减小了 DBR滤 波器的体积。
本发明实施例还提供了一种 DBR双工器, 所述 DBR双工器包括上述 DBR滤波器, 所述 DBR滤波器的组成结构具体可如图 1所示, 所述 DBR 滤波器包括: 耦合单元 12和 DBR谐振腔 11, 相邻两个 DBR谐振腔 11通 过一个耦合单元 12串接;
所述 DBR谐振腔 11 包括: DBR单侧枝节 111和补偿单元 112, 所有 DB 谐振腔 11的 DBR单侧枝节 111设置于所有 DBR谐振腔 11的同一侧, 所有 DBR谐振腔 11的所有补偿单元 112设置于所有 DBR谐振腔 11的另 一侧。
依据本发明实施例的一个方面, 所述耦合单元 12为耦合线; 本发明实 施例将相邻 DBR谐振腔 11之间的耦合线设置为与所述 DBR滤波器通带的 中心频率及所述 DBR滤波器的耦合强度适配的形状。
具体的,本发明实施例所述的 DBR滤波器的形状近似于一个鱼骨结构, 所述 DBR谐振腔 11通过所述耦合线串接在一起,并且所述 DBR谐振腔 11 的 DBR单侧枝节 111和所述补偿单元 112分别设置于所述耦合线的两侧, 并且所有的 DBR单侧枝节 111设置于所述耦合线的同一侧; 相应的, 所有 的补偿单元 112设置于所述耦合线的另一侧;并且,所述 DBR单侧枝节 111 和所述补偿单元 112是——相对应的。
并且, 所述耦合线的长度及宽度与所述 DBR滤波器的通带的中心频率 及所述 DBR滤波器的耦合强度有关; 具体的, 所述中心频率越大, 所述耦 合线的长度越短; 带宽越宽, 所述耦合线的宽度越小。 依据本发明实施例的另一个方面, 所述补偿单元 112 为感性元件或容 性元件。
依据本发明实施例的另一个方面, 所述感性元件包括: 短路线, 或集 总电感。
依据本发明实施例的另一个方面, 所述容性元件包括: 开路线, 或集 总电容。
依据本发明实施例的另一个方面, 所述 DBR双工器的接收端的 DBR 滤波器的补偿单元为短路线; 或者为集总电感。
图 2为本发明实施例提供的 DBR双工器的接收端的版图结构示意图, 如图 2所示,所述 DBR双工器的接收端的 DBR滤波器包括两个 DBR谐振 腔 21, 所述 DBR谐振腔 21包括 DBR单侧枝节 211, 所述 DBR单侧枝节 211的一端接地;
所述 DBR谐振腔 21之间通过耦合线 22相连接, 所述耦合线的长度、 宽度可依据耦合强度及中心频率设置, 所述中心频率越大, 耦合线的长度 越短; 所述耦合强度的带宽越宽, 耦合线的宽度越小。
所述 DBR单侧枝节 211的长度、 宽度可依据传输频率及传输零点的位 置设置, 所述传输频率越低, 所述 DBR单侧枝节 211的长度越长。
依据本发明实施例的另一个方面, 所述 DBR双工器的发射端的 DBR 滤波器的补偿单元为开路线; 或者为集总电容。
图 3为本发明实施例提供的 DBR双工器的发射端的版图结构示意图, 如图 3所示,所述 DBR双工器的发射端的 DBR滤波器包括两个 DBR谐振 腔 31, 所述 DBR谐振腔 31包括 DBR单侧枝节 311, 所述 DBR单侧枝节 311的一端为开路结构;
所述 DBR谐振腔 31之间通过耦合线 32相连接, 所述耦合线的长度、 宽度可依据耦合强度及中心频率设置, 所述中心频率越大, 耦合线的长度 越短; 所述耦合强度的带宽越宽, 耦合线的宽度越小;
所述 DBR单侧枝节 211的长度、 宽度可依据传输频率及传输零点的位 置设置, 所述传输频率越低, 所述 DBR单侧枝节 211的长度越长。
本实施例中, 将如图 2所示的 DBR双工器的接收端和如图 3所示的 DBR双工器的发射端连接在一起,通过额外的匹配调整, 即得到 DBR双工 哭口 。
图 4为本发明实施例提供的 DBR双工器的响应示意图, 所述响应示意 图依据图 2所示的 DBR双工器的接收端和图 3所述的 DBR双工器的发射 端仿真测试得出。 如图 4所示, 图 4示出了发射(Tx )通道和接收(Rx ) 通道随频率变化的增益特性; 其中, 所述 Tx通道和所述 Rx通道形成两个 传输零点, 并且所述传输零点在相对通道通带处, 提高了隔离度。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。 凡在本发明的精神和范围之内所作的任何修改、 等同和改进等, 均包含在本发明的保护范围之内。 工业实用性
本发明实施例通过仅保留 DBR单侧枝节以及小型化的补偿单元, 既保 证了 DBR滤波器的通带要求,又使得 DBR滤波器的尺寸仅为原有 DBR滤 波器尺寸的一半, 大大减小了 DBR滤波器及 DBR双工器的尺寸, 且隔离 性更好。

Claims

权利要求书
1、 一种双重行为谐振 DBR滤波器, 所述 DBR滤波器包括: 耦合单元 和 DBR谐振腔, 相邻两个 DBR谐振腔通过一个耦合单元串接;
所述 DBR谐振腔包括: DBR单侧枝节和补偿单元, 所有 DBR谐振腔 的 DBR单侧枝节设置于所有 DBR谐振腔的同一侧,所有 DBR谐振腔的补 偿单元设置于所有 DBR谐振腔的另一侧。
2、 根据权利要求 1所述的 DBR滤波器, 其中, 所述耦合单元为耦合 线, 将相邻 DBR谐振腔之间的耦合线设置为与所述 DBR滤波器的通带的 中心频率及所述 DBR滤波器的耦合强度适配的形状。
3、 根据权利要求 1所述的 DBR滤波器, 其中, 所述补偿单元为感性 元件。
4、 根据权利要求 3所述的 DBR滤波器, 其中, 所述感性元件包括: 短路线, 或集总电感。
5、 根据权利要求 1所述的 DBR滤波器, 其中, 所述补偿单元为容性 元件。
6、 根据权利要求 4所述的 DBR滤波器, 其中, 所述容性元件包括: 开路线, 或集总电容。
7、 一种 DBR双工器, 所述双工器包括 DBR滤波器; 所述 DBR滤波 器包括: 耦合单元和 DBR谐振腔, 相邻两个 DBR谐振腔通过一个耦合单 元串接;
所述 DBR谐振腔包括: DBR单侧枝节和补偿单元, 所有 DBR谐振腔 的 DBR单侧枝节设置于所有 DBR谐振腔的同一侧,所有 DBR谐振腔的补 偿单元设置于所有 DBR谐振腔的另一侧。
8、 根据权利要求 7所述的双工器, 其中, 所述耦合单元为耦合线, 将 相邻 DBR谐振腔之间的耦合线设置为与所述 DBR滤波器的通带的中心频 率及所述 DBR滤波器的耦合强度适配的形状。
9、 根据权利要求 7所述的双工器, 其中, 所述补偿单元为感性元件。
10、 根据权利要求 9所述的双工器, 其中, 所述感性元件包括: 短路 线, 或集总电感。
11、 根据权利要求 7所述的双工器, 其中, 所述补偿单元为容性元件。
12、 根据权利要求 11所述的双工器, 其中, 所述容性元件包括: 开路 线, 或集总电容。
13、 根据权利要求 7至 12任一项所述的双工器, 其中, 所述双工器的 接收端的 DBR滤波器的补偿单元为短路线; 或者为集总电感。
14、根据权利要求 8所述的双工器,其中,所述双工器的发射端的 DBR 滤波器的补偿单元为开路线; 或者为集总电容。
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