WO2018039898A1 - Émetteur radio et coupleur directionnel miniaturisé associé - Google Patents

Émetteur radio et coupleur directionnel miniaturisé associé Download PDF

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Publication number
WO2018039898A1
WO2018039898A1 PCT/CN2016/097276 CN2016097276W WO2018039898A1 WO 2018039898 A1 WO2018039898 A1 WO 2018039898A1 CN 2016097276 W CN2016097276 W CN 2016097276W WO 2018039898 A1 WO2018039898 A1 WO 2018039898A1
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WO
WIPO (PCT)
Prior art keywords
microstrip line
directional coupler
main transmission
circuit board
transmission microstrip
Prior art date
Application number
PCT/CN2016/097276
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English (en)
Chinese (zh)
Inventor
张静磊
张刚建
Original Assignee
海能达通信股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 海能达通信股份有限公司 filed Critical 海能达通信股份有限公司
Priority to PCT/CN2016/097276 priority Critical patent/WO2018039898A1/fr
Publication of WO2018039898A1 publication Critical patent/WO2018039898A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers

Definitions

  • the present invention relates to a communication device, and more particularly to a directional coupler for a wireless transmission device.
  • directional couplers are a very important device that is often used at the output of power amplifiers for power detection and standing wave detection.
  • a prior art directional coupler 30a uses a bilaterally coupled microstrip line to implement forward power coupling and reverse power coupling, respectively.
  • the directional coupler 30a generally includes a main transmission microstrip line 1a having an input end 11a and an output end 12a, a forward coupled microstrip line 2a having an output end 21a and a load end 22a, and a reverse coupled microstrip line 3a There are an output end 31a and a load end 32a; and two matching loads 4a, 5a are respectively connected to the load terminals 22a, 32a, and each of the matching loads 4a, 5a is composed of four components.
  • the main transmission microstrip line 1a, the forward coupled microstrip line 2a, and the reverse coupled microstrip line 3a are disposed on the same surface of the circuit board, and the components for matching the loads 4a, 5a are mounted.
  • each of the coupled microstrip lines 2a, 3a has a long length, is in principle a quarter wavelength of a required operating frequency, and has a large occupied area; and, the coupled microstrip line 2a,
  • the load terminals 22a, 32a of 3a are connected to the matching loads 4a, 5a, so that the number of constituent devices of the entire directional coupler 30a is large; the physical size of the directional coupler 30a is relatively large, and the miniaturization of the product is not easy.
  • the invention provides a miniaturized directional coupler, comprising a circuit board and a main transmission microstrip line disposed on the circuit board, and forward coupled microstrip lines and opposite couplings respectively located on opposite sides of the main transmission microstrip line a microstrip line
  • the circuit board is a circuit board having at least three metal layers
  • the main transmission microstrip line, the forward coupled microstrip line and the reverse coupled microstrip line are disposed on a surface metal layer of the circuit board
  • the forward coupled microstrip line has an intermediate connection end corresponding to an output end of the main transmission microstrip line, the reverse coupled microstrip line having an intermediate connection end corresponding to an input end of the main transmission microstrip line
  • the directional coupler further includes an auxiliary transmission microstrip line for connecting an intermediate connection end of the forward coupled microstrip line to an intermediate connection end of the reverse coupled microstrip line, wherein the auxiliary transmission microstrip line At least one metal layer for grounding is spaced between the main transmission microstrip lines.
  • the intermediate connection end of the forward coupled microstrip line is connected to one end of the auxiliary microstrip transmission line through a via; the intermediate connection end of the reverse coupled microstrip line passes through the via and the auxiliary microstrip transmission line The other end is connected.
  • the auxiliary transmission microstrip line is disposed on another metal layer opposite to the main transmission microstrip line On the surface metal layer.
  • the auxiliary transmission microstrip line is Z-shaped with a body parallel to the main transmission microstrip line and two connection segments perpendicular to the body at the ends of the body.
  • the portion of the metal layer surrounding the auxiliary transmission microstrip line is grounded.
  • the width of the auxiliary transmission microstrip line is related to the set impedance.
  • the width of the auxiliary transmission microstrip line is greater than the width of the forward coupled microstrip line/the reverse coupled microstrip line and less than the width of the main transmission microstrip line.
  • the directional coupler is adapted for frequencies not exceeding 1 GHz.
  • the directional coupler is adapted for a frequency range of 136-174 MHz.
  • the invention also proposes a radio transmitter comprising a power amplifier and a directional coupler coupled to the output of the power amplifier, the directional coupler being a miniaturized directional coupler as described above.
  • the miniaturized directional coupler of the present invention connects the intermediate connection end of the forward coupled microstrip line with the intermediate connection end of the reverse coupled microstrip line by subtly setting the auxiliary transmission microstrip line, and makes the auxiliary At least one metal layer for grounding is disposed between the transmission microstrip line and the main transmission microstrip line as a reference ground for the auxiliary transmission microstrip line and the transmission microstrip line, and the forward coupled microstrip line can be shortened/ The length of the reverse-coupled microstrip line, and the elimination of two matching loads, can reduce the board footprint, improve the isolation and directionality indicators, and thus facilitate product miniaturization.
  • FIG. 1 is a schematic diagram of an electrical principle illustrating the circuit structure of a prior art directional coupler.
  • FIG. 2 is a schematic diagram showing the circuit structure of the directional coupler of the present invention.
  • FIG. 3 is a schematic cross-sectional view of a circuit board illustrating the implementation of the directional coupler of the present invention on a circuit board.
  • Figure 4 is an electrical block diagram showing the circuit configuration of the radio transmitter of the present invention.
  • Figure 2 is a schematic diagram of an electrical circuit illustrating the circuit configuration of the directional coupler of the present invention.
  • 3 is a schematic cross-sectional view of a circuit board illustrating the implementation of the directional coupler of the present invention on a circuit board.
  • Figure 4 is an electrical block diagram showing the circuit configuration of the radio transmitter of the present invention.
  • the present invention provides a radio transmitter comprising a power amplifier 10 and a directional coupler 30 coupled to the output of the power amplifier 10 for detecting output power and load matching of the power amplifier 10.
  • the detected output power can be used for power control; the detected load matching condition can be used for standing wave protection.
  • the power amplifier 10 can be appropriately reduced.
  • the output power is used to protect the power amplifier 10 from damage.
  • the miniaturized directional coupler 30 of the present invention generally comprises: a circuit board 9 which is a circuit board having at least three metal layers; and a main transmission microstrip disposed on a surface metal layer of the circuit board 9. a line 1 and a forward coupled microstrip line 2 and a reverse coupled microstrip line 3 respectively located on both sides of the main transmission microstrip line 1; and an auxiliary transmission microstrip disposed on the other surface metal layer of the circuit board 9 a line 6 for connecting the forward coupled microstrip line 2 to the reverse coupled microstrip line 3, wherein at least one of the auxiliary transmission microstrip line 6 and the main transmission microstrip line 1 are spaced apart
  • the metal layer 93 is grounded.
  • the circuit board 9 has three metal layers.
  • the metal layer of the top surface is provided with a main transmission microstrip line 1
  • the metal layer of the bottom surface is provided with an auxiliary transmission microstrip line 6 .
  • the metal layer 93 is sandwiched between the first dielectric layer 91 and the second dielectric layer 92 .
  • the circuit board 9 can be 4 layers, 6 layers, 8 layers, and the like.
  • the auxiliary transmission microstrip line 6 does not have to be disposed on the surface metal layer of the circuit board 9, and may be disposed on the intermediate metal layer.
  • One end of the forward coupled microstrip line 2 is an isolated end (corresponding to the output end 21a of the aforementioned forward coupled microstrip line 2a) 21, and the other end is an intermediate corresponding to the output end 12 of the main transmission microstrip line 1.
  • the connection end (corresponding to the load end 22a of the aforementioned forward coupled microstrip line 2a) 22 is provided.
  • the intermediate connection end 22 is connected to one end of the auxiliary microstrip transmission line 6 via a via 95; one end of the reverse coupled microstrip line 3 is a coupling end (corresponding to the output end 31a of the reverse coupled microstrip line 3a) 31 The other end is an intermediate connection end (corresponding to the load end 32a of the reverse coupled microstrip line 3a) 32 corresponding to the input end 11 of the main transmission microstrip line 1.
  • the intermediate connection end 32 is connected to the other end of the auxiliary microstrip transmission line 6 via a via 94.
  • the auxiliary transmission microstrip 6 is z-shaped with a main body 61 parallel to the main transmission microstrip line 1 and two connecting sections 62, 63 perpendicular to the main body 61 at both ends of the main body 61.
  • the portion of the metal layer surrounding the auxiliary transmission microstrip line 6 is grounded. It is worth mentioning that the arrangement of the auxiliary transmission microstrip line 6 of the present invention is equivalent to simultaneously increasing the length of the forward coupled microstrip line 2 and the reverse coupled microstrip line 3, which is advantageous for reducing the directional coupling.
  • the board footprint of the device 30 is equivalent to simultaneously increasing the length of the forward coupled microstrip line 2 and the reverse coupled microstrip line 3, which is advantageous for reducing the directional coupling.
  • the main transmission microstrip line 1 is a 50 ohm impedance line whose line width is determined according to the power capacity.
  • the width of the forward coupled microstrip line 2 and the reverse coupled microstrip line 3 and its distance from the main transmission microstrip line 1 are determined according to the degree of coupling.
  • the width of the auxiliary transmission microstrip line 6 is related to the set impedance. There is no constraint in the spatial arrangement of the auxiliary transmission microstrip line 6 and the main transmission microstrip line 1.
  • the auxiliary transmission microstrip line 6 has a design impedance of 50 ohms.
  • the width of the auxiliary transmission microstrip line 6 is greater than the width of the forward coupled microstrip line 2 / the reverse coupled microstrip line 3 and is smaller than the width of the main transmission microstrip line 1.
  • the directional coupler 30 is adapted for a frequency range of 136-174 MHz. In other applications, the directional coupler 30 is suitable for frequencies not exceeding 1 GHz.
  • the technical index of the miniaturized directional coupler 30 of the present invention and the existing directional coupler 30a is shown in the following table.
  • the present invention has significant improvement in isolation and directionality indicators, and the isolation and directionality indicators are key indicators for measuring the performance of the directional coupler.
  • the miniaturized directional coupler 30 of the present invention connects the intermediate connection end 22 of the forward coupled microstrip line 2 to the intermediate connection end 32 of the reverse coupled microstrip line 3 by subtly setting the auxiliary transmission microstrip line 6. And at least one metal layer 93 for grounding between the auxiliary transmission microstrip line 6 and the main transmission microstrip line 1 as a reference for the auxiliary transmission microstrip line 6 and the main transmission microstrip line 1
  • the length of the forward coupled microstrip line 2 and the reverse coupled microstrip line 3 can be shortened, and two matching loads can be omitted, which can reduce the board occupation area (the directional coupler 30 of the present invention occupies The board area is only 55% of the board area occupied by the prior art directional coupler 30a, and the isolation and directionality indicators can be improved, thereby facilitating miniaturization of the product.

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Abstract

La présente invention concerne un coupleur directionnel miniaturisé, comprenant : une carte de circuit imprimé, une ligne microruban d'émission principale disposée sur la carte de circuit imprimé, une ligne microruban de couplage vers l'avant et une ligne microruban de couplage inverse situées respectivement sur les deux côtés de la ligne microruban d'émission principale. La carte de circuit imprimé est une carte de circuit imprimé ayant au moins trois couches métalliques; la ligne microruban d'émission principale, la ligne microruban de couplage vers l'avant et la ligne microruban de couplage inverse sont agencées sur une couche métallique de surface de la carte de circuit imprimé; la ligne microruban de couplage vers l'avant a une extrémité de connexion intermédiaire correspondant à une extrémité de sortie de la ligne microruban d'émission principale, et la ligne microruban de couplage inverse a une extrémité de connexion intermédiaire correspondant à une extrémité d'entrée de la ligne microruban d'émission principale. Le coupleur directionnel comprend en outre : une ligne microruban d'émission auxiliaire, qui est utilisée pour connecter les deux extrémités de connexion intermédiaire, la ligne microruban d'émission auxiliaire étant séparée de la ligne microruban d'émission principale par au moins une couche métallique utilisée pour la mise à la terre. Ainsi, une zone de surface occupée par la carte de circuit imprimé peut être réduite, et les performances d'isolation et de direction peuvent également être améliorées, ce qui facilite la miniaturisation de produits.
PCT/CN2016/097276 2016-08-30 2016-08-30 Émetteur radio et coupleur directionnel miniaturisé associé WO2018039898A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2016/097276 WO2018039898A1 (fr) 2016-08-30 2016-08-30 Émetteur radio et coupleur directionnel miniaturisé associé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2016/097276 WO2018039898A1 (fr) 2016-08-30 2016-08-30 Émetteur radio et coupleur directionnel miniaturisé associé

Publications (1)

Publication Number Publication Date
WO2018039898A1 true WO2018039898A1 (fr) 2018-03-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023273818A1 (fr) * 2021-06-30 2023-01-05 华为技术有限公司 Coupleur et dispositif électronique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101150219A (zh) * 2006-09-20 2008-03-26 株式会社瑞萨科技 定向耦合器和高频电路模块
US20080111650A1 (en) * 2006-11-14 2008-05-15 Jen-I Kuo Coupling device with electro-magnetic compensation
CN101213705A (zh) * 2005-04-07 2008-07-02 凯瑟雷恩工厂两合公司 高频耦合器或功率分配器，尤其是窄带和/或3dB耦合器或功率分配器
CN201556694U (zh) * 2009-11-20 2010-08-18 北京瑞夫艾电子有限公司 一种多层介质定向耦合器
CN205985291U (zh) * 2016-08-30 2017-02-22 海能达通信股份有限公司 无线电发射机及其小型化的定向耦合器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101213705A (zh) * 2005-04-07 2008-07-02 凯瑟雷恩工厂两合公司 高频耦合器或功率分配器，尤其是窄带和/或3dB耦合器或功率分配器
CN101150219A (zh) * 2006-09-20 2008-03-26 株式会社瑞萨科技 定向耦合器和高频电路模块
US20080111650A1 (en) * 2006-11-14 2008-05-15 Jen-I Kuo Coupling device with electro-magnetic compensation
CN201556694U (zh) * 2009-11-20 2010-08-18 北京瑞夫艾电子有限公司 一种多层介质定向耦合器
CN205985291U (zh) * 2016-08-30 2017-02-22 海能达通信股份有限公司 无线电发射机及其小型化的定向耦合器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023273818A1 (fr) * 2021-06-30 2023-01-05 华为技术有限公司 Coupleur et dispositif électronique

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