CN105406162A - Strong coupling design method for micro-strip parallel line and directional coupler - Google Patents

Strong coupling design method for micro-strip parallel line and directional coupler Download PDF

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Publication number
CN105406162A
CN105406162A CN201510909051.0A CN201510909051A CN105406162A CN 105406162 A CN105406162 A CN 105406162A CN 201510909051 A CN201510909051 A CN 201510909051A CN 105406162 A CN105406162 A CN 105406162A
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CN
China
Prior art keywords
line
parallel
directional coupler
microstrip
microstrip line
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CN201510909051.0A
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Chinese (zh)
Inventor
闫志泉
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Shenzhen hongyuan communication LLC
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Shenzhen hongyuan communication LLC
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Priority to CN201510909051.0A priority Critical patent/CN105406162A/en
Publication of CN105406162A publication Critical patent/CN105406162A/en
Pending legal-status Critical Current

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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
    • H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Waveguides (AREA)

Abstract

The invention provides a strong coupling design method for a micro-strip parallel line. Under the condition that a micro-strip line interval S is constant, different W/H values are adjusted through a formula of characteristic impedance Z0 to realize strong coupling. The invention furthermore provides a directional coupler. The method has the beneficial effects that the strong coupling can be realized by adjusting different W/H values, so that the difficulty in wiring is lowered and a process is relatively easy to implement.

Description

A kind of close coupling method for designing of microstrip parallel and directional coupler
Technical field
The present invention relates to microstrip parallel, particularly relate to a kind of close coupling method for designing and directional coupler of microstrip parallel.
Background technology
Directional coupler is a kind of directive coupling power device, has a wide range of applications in radio system, as power monitoring system, test macro, power division synthesis system, and digital base transceiver station etc.
Current coupler can be divided into waveguide type, coaxial line style, stripline, micro strip line type etc. by its implementation.Propose harsh requirement at the volume and weight of many microwave systems to microwave circuit, wish that, with in little, the lightweight situation of volume, because microstrip line implementation method is simple, volume is little, lightweight, is a kind of desirable transmission line.
The composition of a basic parallel coupled line directional coupler is as shown in Figure 1 to Figure 2:
Each parameter is defined as follows:
W: the width of microstrip line
H: the height of medium
T: conductor thickness, conductor is generally copper, and through surface treatment
S: microstrip line spacing
L: the length and width of coupled microstrip line, for ensureing good isolation, its physical length of L is λ o/ 4, λ ofor electromagnetic wave is at the one-period wavelength of medium transmission, also can represent with electrical degree θ=90 ゜.
ε r: the dielectric constant of medium
C: the degree of coupling C=10lg (P1/P4) of coupled microstrip line, P1, P4 are the power in input, coupling port.
The coupling of parallel coupled line directional coupler is strong and weak relevant apart from S with line-to-line, and spacing is less, is coupled stronger.But coupling is too strong, and technique cannot realize again, the way of three weak coupling directional coupler phases cascade is therefore often adopted to obtain close coupling directional coupler.
Cascade microstrip parallel directional coupler shortcoming is its microstrip line length, has 3 grades of cascades, and its length is just 3 θ, and institute wired be all parallel lines, cause difficult wiring.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of close coupling method for designing and directional coupler of microstrip parallel.
The invention provides a kind of close coupling method for designing of microstrip parallel, when microstrip line interval S is certain, by characteristic impedance Z 0formula adjust different W/H values, to realize close coupling, characteristic impedance Z 0formula be expressed as:
Z 0＝60ln(8H/W+W/4H)/(ε r) 1/2Ω(W/H≤1)
Z 0＝120π/{[W/H+2.42-0.44H/W+(1-H/W) 8]*(ε r) 1/2}Ω(W/H≥1)
Wherein, W is the width of microstrip line; H is the height of medium; ε r is the dielectric constant of medium.
Present invention also offers a kind of directional coupler, adopt the close coupling method for designing of microstrip parallel described above to design.
As a further improvement on the present invention, comprise the first microstrip line and the second microstrip line, described first microstrip line comprises the first parallel coupling portion and is positioned at first matched line at described first two ends, parallel coupling portion, described second microstrip line comprises the second parallel coupling portion and is positioned at second matched line at described second two ends, parallel coupling portion, and described first parallel coupling portion parallels with described second parallel coupling portion.
As a further improvement on the present invention, described first microstrip line is in-line, and described second microstrip line is U-shaped.
As a further improvement on the present invention, described second matched line is perpendicular to described first matched line.
The invention has the beneficial effects as follows: by such scheme, by adjusting different W/H values to realize close coupling, reducing the difficulty of wiring, also more easily realizing in technique.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of parallel coupled line directional coupler basic in prior art.
Fig. 2 is the schematic diagram of parallel coupled line directional coupler basic in prior art.
Fig. 3 is the schematic diagram of a kind of directional coupler of the present invention.
Embodiment
Illustrate below in conjunction with accompanying drawing and embodiment the present invention is further described.
A kind of close coupling method for designing of microstrip parallel, according to microstrip line principle, when microstrip line interval S is certain, the width W of coupling microstrip line and the height H ratio of medium lower, the degree of coupling C of coupled microstrip line is higher, namely W/H is inversely proportional to degree of coupling C, and W/H ratio is the major parameter of the microstrip line characteristic impedance of coupled microstrip line, by characteristic impedance Z 0formula adjust different W/H values, to realize close coupling, characteristic impedance Z 0formula be expressed as:
Z 0＝60ln(8H/W+W/4H)/(ε r) 1/2Ω(W/H≤1)
Z 0＝120π/{[W/H+2.42-0.44H/W+(1-H/W) 8]*(ε r) 1/2}Ω(W/H≥1)
Wherein, W is the width of microstrip line; H is the height of medium; ε r is the dielectric constant of medium.
Therefore W/H diminishes, its characteristic impedance can become large, relative to former 50 Ω systems, causes impedance mismatching, now adds impedance matching portion, with adaptive system demand.
Namely characteristic impedance is larger, and degree of coupling C is larger under otherwise identical conditions, thus, can design the coupler of high characteristic impedance, then is matched 50 Ω systems, realizes principle as shown in Figure 3.
As shown in Figure 3, a kind of directional coupler, adopts the close coupling method for designing of microstrip parallel described above to design.
As shown in Figure 3, comprise the first microstrip line 1 and the second microstrip line 2, described first microstrip line 1 comprises the first parallel coupling portion 11 and is positioned at first matched line 12 at described first two ends, parallel coupling portion 11, described second microstrip line 2 comprises the second parallel coupling portion 21 and is positioned at second matched line 22 at described second two ends, parallel coupling portion 21, and described first parallel coupling portion 11 parallels with described second parallel coupling portion 21.
As shown in Figure 3, described first microstrip line 1 is in-line, and described second microstrip line 2 is U-shaped.
As shown in Figure 3, described second matched line 22 is perpendicular to described first matched line 12.
First parallel coupling portion 11 is θ with the length in described second parallel coupling portion 21, and its characteristic impedance is greater than 50 Ω, with 50 Ω mismatches.System, coupled degree C grow.For with 50 Ω system matches, at the port of the first microstrip line 1 and the second microstrip line 2, the first matched line 12 and the second matched line 22 is set respectively.The wiring direction of the first matched line 12 and the second matched line 22 is unrestricted.Four ports can change direction.
Compared with cascade microstrip parallel directional coupler, parallel lines contraction in length, the first matched line 12 and the second matched line 22 without parallel wiring, can save wiring area.
When weak coupling C=15dB, the size of change W, H, calculates the situation of change of degree of coupling C: as shown in the table, with the W of C=15dB, H for reference, and the situation of change (unit dB) of degree of coupling C.
Visible, adjust different W/H values and can realize close coupling.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.

Claims (5)

1. a close coupling method for designing for microstrip parallel, is characterized in that: when microstrip line interval S is certain, by characteristic impedance Z 0formula adjust different W/H values, to realize close coupling, characteristic impedance Z 0formula be expressed as:
Z 0＝60ln(8H/W+W/4H)/(ε r) 1/2Ω(W/H≤1)
Z 0＝120π/{[W/H+2.42-0.44H/W+(1-H/W) 8]*(ε r) 1/2}Ω(W/H≥1)
Wherein, W is the width of microstrip line; H is the height of medium; ε r is the dielectric constant of medium.
2. a directional coupler, is characterized in that: adopt the close coupling method for designing of microstrip parallel according to claim 1 to design.
3. directional coupler according to claim 2, it is characterized in that: comprise the first microstrip line and the second microstrip line, described first microstrip line comprises the first parallel coupling portion and is positioned at first matched line at described first two ends, parallel coupling portion, described second microstrip line comprises the second parallel coupling portion and is positioned at second matched line at described second two ends, parallel coupling portion, and described first parallel coupling portion parallels with described second parallel coupling portion.
4. directional coupler according to claim 3, is characterized in that: described first microstrip line is in-line, and described second microstrip line is U-shaped.
5. directional coupler according to claim 3, is characterized in that: described second matched line is perpendicular to described first matched line.
CN201510909051.0A 2015-12-09 2015-12-09 Strong coupling design method for micro-strip parallel line and directional coupler Pending CN105406162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510909051.0A CN105406162A (en) 2015-12-09 2015-12-09 Strong coupling design method for micro-strip parallel line and directional coupler

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Application Number Priority Date Filing Date Title
CN201510909051.0A CN105406162A (en) 2015-12-09 2015-12-09 Strong coupling design method for micro-strip parallel line and directional coupler

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CN105406162A true CN105406162A (en) 2016-03-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010045748A (en) * 2008-07-14 2010-02-25 Tdk Corp Line of union
CN102509842A (en) * 2011-11-22 2012-06-20 华为技术有限公司 Directional coupler
CN203589181U (en) * 2012-10-31 2014-05-07 安捷伦科技有限公司 Directional coupler of forward coupling
CN104091988A (en) * 2014-07-04 2014-10-08 芜湖航飞科技股份有限公司 Microwave planar circuit coupler
CN104157948A (en) * 2014-08-12 2014-11-19 上海航天电子通讯设备研究所 High directivity microstrip power coupler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010045748A (en) * 2008-07-14 2010-02-25 Tdk Corp Line of union
CN102509842A (en) * 2011-11-22 2012-06-20 华为技术有限公司 Directional coupler
CN203589181U (en) * 2012-10-31 2014-05-07 安捷伦科技有限公司 Directional coupler of forward coupling
CN104091988A (en) * 2014-07-04 2014-10-08 芜湖航飞科技股份有限公司 Microwave planar circuit coupler
CN104157948A (en) * 2014-08-12 2014-11-19 上海航天电子通讯设备研究所 High directivity microstrip power coupler

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
TAKAO FUJII ET AL: "Design Method of Coupled-Microstrip Directional Couplers Based on Equivalent Admittance Approach", 《ELECTRONICS AND COMMUNICATIONS IN JAPAN》 *
清华大学本书编写组: "《微带电路》", 31 December 1976 *

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Application publication date: 20160316