EP1011166A1 - Elément de couplage à micro-ondes - Google Patents

Elément de couplage à micro-ondes Download PDF

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Publication number
EP1011166A1
EP1011166A1 EP99119577A EP99119577A EP1011166A1 EP 1011166 A1 EP1011166 A1 EP 1011166A1 EP 99119577 A EP99119577 A EP 99119577A EP 99119577 A EP99119577 A EP 99119577A EP 1011166 A1 EP1011166 A1 EP 1011166A1
Authority
EP
European Patent Office
Prior art keywords
coupling element
line
element according
microwave
lines
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP99119577A
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German (de)
English (en)
Inventor
Thomas Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1011166A1 publication Critical patent/EP1011166A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20363—Linear resonators

Definitions

  • the invention relates to a microwave coupling element for coupling an input line with a Output line, each a fixed Have line resistance.
  • Coupling elements and bandpass filters implemented by means of a parallel pair of strip lines are common in microwave technology and are described in the literature.
  • Stripline coupling elements of this type have two parallel, galvanically decoupled striplines, each with a length of ⁇ / 4, where ⁇ is the effective nominal wavelength of the microwaves to be transmitted with the coupling element.
  • ⁇ is the effective nominal wavelength of the microwaves to be transmitted with the coupling element.
  • Such structural widths and distances are problematic by means of inexpensive standard printed circuit board technology.
  • Microwave coupling element has a coupling section with a first one with the input line connected stripline and a second, too parallel to the first stripline and to this galvanically decoupled second stripline on, with wire width and / or wire spacing of Strip lines (3.3 ') up to twice as large are like that to achieve a minimal Mismatch with the input and output lines optimal wire width or wire spacing, and being used to compensate for the resulting Mismatch at least one transformation line is provided, the wave resistance is smaller than the line impedance.
  • two transformation lines can be provided between the input line or the output line and the coupling section are arranged.
  • the use of two transformation lines has the advantage that to compensate for a certain higher coupling section wave resistance each not so small transform line impedance sufficient so that a lesser Width of the transformation line is sufficient.
  • the advantageous width of a strip line is by transverse resonance effects and the like upwards limited.
  • the two transformation lines preferably have a length of between ⁇ / 4 and ⁇ / 8, which area a favorable compromise between the smallest possible overall length of the component and electrical parameters that are as favorable as possible represents.
  • the transformation lines advantageously one Characteristic impedance between 30 and 40 ⁇ .
  • Microwave coupling element is only a transformation line provided a length of approximately ⁇ / 4 and a wave impedance accordingly half of the line impedance can.
  • This variant of the invention has the Advantage of a short component length.
  • the pair of striplines preferably has one Length of ⁇ / 4.
  • the width of each of the two Strip lines is preferably between 150 ⁇ m and 250 ⁇ m, the distance preferably is between 100 ⁇ m and 200 ⁇ m. These dimensions can be easily and inexpensively using standard circuit board technology realize.
  • the insertion loss is preferably at Nominal frequency of the coupling element less than 1 dB.
  • the microwave coupling element according to the invention has preferably a bandpass frequency characteristic on. It is particularly desirable a high blocking attenuation for in relation to the nominal frequency low frequencies to avoid interference from digital control pulses and their higher harmonics to suppress.
  • the microwave strip line according to the invention has the further advantage that due to the greater distance between the two strip lines of the Coupling section increases the dielectric strength is.
  • FIG. 1 shows a first embodiment of a microwave coupling element according to the invention.
  • the input line 1 and the output line 2 are only shown schematically, each of which has a fixed line impedance R L , for example 50 ⁇ .
  • R L line impedance
  • the invention provides two transformation lines 4, 4 ', the wave resistance of which is smaller than the line wave resistance.
  • the characteristic impedance of the transformation lines 4,4 ' is preferably between 30 and 40 ⁇ , for example 35 ⁇ .
  • the microwave coupling element according to the invention shown in Figure 1 has a very low insertion loss in the range of the nominal frequency of the coupling element (that is, the frequency that corresponds to an effective wavelength equal to four times the length of the microstrip lines 3,3 ') and shows a pronounced blocking attenuation in the area lower frequencies.
  • the dimensions of the transformation lines 4,4 ' must take into account a maximum possible Structure width of the microstrip lines is limited by resonance effects, and one desirable compact, especially short design of the entire component can be selected.
  • a Length of the transformation lines 4,4 'in the area between ⁇ / 4 and ⁇ / 8, in particular 0.65 x ⁇ / 4 has proven to be advantageous.
  • FIG 2 shows a second embodiment of a microwave coupling element according to the invention.
  • the Difference to the embodiment shown in Figure 1 is just a transformation line 4 intended. This variant therefore enables particularly compact component dimensions.
  • Figure 3 shows the measured frequency response of a Example of a microwave coupling element according to the invention.
  • the nominal frequency is approximately 24 GHz.
  • the coupling element shows a distinctive bandpass characteristic with a wide passage maximum in the range between about 21 and 27 GHz. At lower frequencies there is a clear barrier damping, which are used to suppress digital control signals and their harmonics evoked Radio frequency interference signals is desired.
  • FIG. 4 shows the frequency range on an enlarged scale between 20 GHz and 28 GHz.
  • the insertion loss is close to the nominal frequency of 24 GHz is less than 0.5 dB.
  • Figure 5 shows the simulated frequency response of a coupling element according to the invention with a coupling section, whose microstrip lines one Length of 2.5mm, width of 0.1mm and one Have a distance of 0.23 mm as a solid Line and represented with circle symbols.
  • the bandpass characteristic can be clearly recognized.
  • dotted line and triangular symbols as a reference example, a conventional coupling element without transformation line with 2.5 mm long and 0.1 mm wide lines that are spaced of 0.06 mm from each other.
  • the coupling element according to the invention is again a solid line and circular symbols, the conventional coupling element by a dotted line and triangular Symbolizes symbols. Both curves run in Clockwise, which means they start at 1 near 360 ° at idle point. While the locus of the Coupling element dimensioned according to the prior art (dotted) evenly inside running (recognizable by the almost equidistant Marker points), the locus of the invention Coupling element longer along the outer circle, then quickly (within two Marker points) to go inside. After a near zero crossing in the range of the nominal frequency of The solid curve runs again at 24 GHz outside, which in turn is the one already shown in FIG Bandpass structure shows.
  • microwave coupling element according to the invention are favorable electrical parameters using large and thus inexpensive to manufacture structural dimensions possible.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguides (AREA)
EP99119577A 1998-12-07 1999-10-02 Elément de couplage à micro-ondes Withdrawn EP1011166A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19856339A DE19856339A1 (de) 1998-12-07 1998-12-07 Mikrowellen-Koppelelement
DE19856339 1998-12-07

Publications (1)

Publication Number Publication Date
EP1011166A1 true EP1011166A1 (fr) 2000-06-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99119577A Withdrawn EP1011166A1 (fr) 1998-12-07 1999-10-02 Elément de couplage à micro-ondes

Country Status (3)

Country Link
US (1) US6388538B1 (fr)
EP (1) EP1011166A1 (fr)
DE (1) DE19856339A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10215423B4 (de) * 2002-04-08 2013-04-11 Innosent Gmbh Mikrowellen-Oszillator
DE19937725A1 (de) * 1999-08-10 2001-02-15 Bosch Gmbh Robert Hohlleiterübergang
US6778044B2 (en) 2002-01-23 2004-08-17 Vega Grieshaber Kg Coaxial line plug-in connection with integrated galvanic separation
KR101084249B1 (ko) * 2009-12-24 2011-11-17 삼성전기주식회사 인쇄회로기판 및 이를 포함하는 송수신 모듈
US8801460B2 (en) * 2012-11-09 2014-08-12 Andrew Llc RF shielded capacitively coupled connector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334202A (en) * 1979-11-16 1982-06-08 Her Majesty The Queen In Right Of Canada, As Represented By Minister Of National Defence Of Her Majesty's Canadian Government Broadband frequency divider
JPS60229501A (ja) * 1984-04-27 1985-11-14 Matsushita Electric Ind Co Ltd 直流阻止回路

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334202A (en) * 1979-11-16 1982-06-08 Her Majesty The Queen In Right Of Canada, As Represented By Minister Of National Defence Of Her Majesty's Canadian Government Broadband frequency divider
JPS60229501A (ja) * 1984-04-27 1985-11-14 Matsushita Electric Ind Co Ltd 直流阻止回路

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
C.E. FREE ET AL.: "EXCESS PHASE IN MICROSTRIP DC BLOCKS", ELECTRONICS LETTERS., vol. 20, no. 21, 11 October 1984 (1984-10-11), IEE STEVENAGE., GB, pages 892 - 893, XP002132121, ISSN: 0013-5194 *
D LACOMBE ET AL.: "OCTAVE-BAND MICROSTRIP DC BLOCKS", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES., vol. 20, no. 8, August 1972 (1972-08-01), IEEE INC. NEW YORK., US, pages 555 - 556, XP002132120, ISSN: 0018-9480 *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 87 (E - 393) 5 April 1986 (1986-04-05) *

Also Published As

Publication number Publication date
DE19856339A1 (de) 2000-06-08
US6388538B1 (en) 2002-05-14

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