EP0296929B1 - Symmetrische Mikrowellenübertragungsleitung mit zwei koplanären Leitern - Google Patents

Symmetrische Mikrowellenübertragungsleitung mit zwei koplanären Leitern Download PDF

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Publication number
EP0296929B1
EP0296929B1 EP88401429A EP88401429A EP0296929B1 EP 0296929 B1 EP0296929 B1 EP 0296929B1 EP 88401429 A EP88401429 A EP 88401429A EP 88401429 A EP88401429 A EP 88401429A EP 0296929 B1 EP0296929 B1 EP 0296929B1
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EP
European Patent Office
Prior art keywords
strip
narrow
conductor
transmission line
microwave transmission
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Expired - Lifetime
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EP88401429A
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English (en)
French (fr)
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EP0296929A1 (de
Inventor
Luc Rivière
Alain Carenco
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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
    • H01P1/201—Filters for transverse electromagnetic waves

Definitions

  • the present invention relates to improvements to microwave transmission lines comprising two parallel and coplanar flat conductive tapes.
  • a symmetrical line is formed by two linear metal strips having equal widths W and arranged parallel to each other at a predetermined distance G on a non-conductive substrate.
  • An asymmetrical line consists of a first conductor in the form of a narrow flat metallic strip having a small width W, and of a second conductor in the form of a wide longitudinal conductive plane having a width 1 clearly greater than W and arranged parallel to the narrow conductive tape at a distance G therefrom on the same type of substrate.
  • the symmetrical line For a given characteristic line impedance, the symmetrical line requires a ratio W / G, strip width over width of the gap between conductors, greater than that of the asymmetrical line. As a result, the symmetrical line has ribbons wider than that of the asymmetrical line and / or a narrower gap than that of the asymmetrical line. This dimensional characteristic of the symmetrical line is thus advantageous in that it uses less resistant conductive tapes, while reducing the line width.
  • the symmetrical line is very often chosen when it is necessary to ensure symmetry of the electric and / or magnetic fields of the microwave wave which propagates in the line.
  • a coaxial connector includes a slender central internal conductor having a small diameter and a cylindrical external conductor having a larger diameter and, therefore, provides an asymmetrical conductor structure.
  • the differences in geometric shapes of the connector and the symmetrical line thus cause connection difficulties. These difficulties are in practice resolved by providing, at the end of the line to be connected, a small, substantially rectangular extremal conductive plane connected coplanarly with the end of one of the linear ribbons and constituting with the end of the other ribbon. a flat asymmetrical line portion.
  • the extremal conductive plane is welded laterally to the external cylindrical conductor of the coaxial connector, and the projecting end of the internal conductor of the connector is welded to the end of said other strip of the line.
  • the second drawback of the symmetrical line consists of the appearance of relatively low parasitic frequencies of longitudinal resonance which limit the useful frequency band of the symmetrical line. Longitudinal resonances are by definition lower than transverse resonances which are in the range of very high frequencies. An experimental analysis of resonance shows that part of the microwave energy is neither transmitted nor reflected, but is radiated. Indeed, a symmetrical line has natural frequencies for which a standing wave can form and constitute a source of radiation.
  • the present invention aims to provide a microwave transmission line of the symmetrical line type with two narrow coplanar and parallel ribbons, offering the advantages of the symmetrical lines according to the prior art without the drawbacks of these, particularly with regard to the limitations due to frequencies. of resonance.
  • a line according to the invention offers a useful frequency band significantly higher than a symmetrical line according to the prior art, for identical dimensions relating to the conductive tapes.
  • a symmetrical type microwave transmission line comprising a first conductor in the form of a first flat narrow conductive tape extending over the entire length of the line and having first and second ends, and a second flat conductor coplanar with the first conductor, said second conductor comprising a second flat narrow conductive strip extending parallel to the first narrow strip between the first and second ends of the first narrow strip, and first and second substantially rectangular end planar conductors, connected to the ends of the second narrow strip, and having sides substantially parallel to the first and second ends of the first narrow strip, respectively, is characterized in that the second conductor comprises a wide longitudinal flat conductive strip extending coplanarly and parallel to the first and second narrow strips over the entire length of the line, said wide conductive tape having ends connected to the first and second end plane conductors respectively so as to form in the second flat conductor a resonant cavity delimited by longitudinal sides of the second narrow tape and of the wide tape and by transverse sides opposite the planar conductors extremals.
  • the constitution of the resonant cavity by the presence of the wide longitudinal conductive ribbon connecting the ends of the second narrow ribbon through the small extremal planar conductors makes it possible to offer longitudinal resonance frequencies significantly higher than those of a symmetrical line only with two ribbons close conductors. Indeed, the appearance of standing waves at small resonant frequencies of the symmetrical line with only two ribbons is prevented when the dimensions of the cavity are suitably chosen.
  • the distance between the longitudinal wide ribbon and the second narrow ribbon defining the width of the cavity is chosen to be relatively large compared to the geometric characteristics of the line composed by the two narrow ribbons, namely the widths of the narrow ribbons and the width of the gap between these two ribbons. Under these conditions, the presence of the wide longitudinal conductive tape does not disturbs the characteristic impedance of the symmetrical line only negligibly.
  • the cavity is then divided into one or more sub-cavities by intermediate conductive tapes connected transversely to the second narrow ribbon and to the wide longitudinal ribbon.
  • the short circuits produced by the extreme planar conductors between the second narrow ribbon and the wide ribbon contribute to producing, with the ends of the first narrow ribbon, two end sections of asymmetrical line facilitating the connection of the transmission line to connectors. coaxial.
  • a microwave transmission line comprises a first flat conductor 1 and a second flat conductor 2 which are fixed coplanarly on a plate of non-conductive material 3 such as a dielectric substrate.
  • the conductors 1 and 2 are for example conductive ribbons screen printed on the wafer 3 and having the same thickness.
  • the first conductor 1 consists only of a narrow linear strip 11 having a uniform width W1.
  • the second conductor 2 consists of a narrow linear strip 21 which has a width W2 and which is parallel to the conductive strip 11, two rectangular transverse and extremal planes 22 and 23, and a longitudinal rectangular plane or wide parallel strip 24 with narrow ribbons 11 and 21.
  • the four elements 21 to 24 making up the conductor 2 are delimited by hatching in FIG. 1 in order to differentiate them, although they form a one-piece conductor.
  • the ribbon 21 thus extends parallel to the ribbon 11 over the major part L of the length of the microwave line, in order to form a symmetrical line when the widths W1 and W2 are equal or substantially equal.
  • the distance G between the two strips 11 and 21 is of the same order of magnitude as the widths W1 and W2 and, in general, less than said widths.
  • the extremal planes 22 and 23 have short sides 221 and 231 substantially parallel to the ends 12 and 13 of the first strip 11 and separated from these by interstices having widths g2 and g3 greater than the width G, so that the transitions between the ribbon 21 and the planes 22 and 23 provide recesses 212 and 213.
  • the widths l2 and l3 of the extremal planes 22 and 23 are significantly greater than those W1 and W2 of the ribbons 11 and 12 in order to form sections of asymmetrical line at the ends of the microwave line. These two sections make it possible to connect the symmetrical line 11 + 21 to connection connectors for coaxial lines.
  • the pairs of dimensions g2 and l2, and g3 and l3 which may be different, are adapted as a function of the characteristic impedances and therefore of the dimensions of the coaxial lines to be connected respectively.
  • such a connector 4 to be connected to the end of the line comprising the plane 22 conventionally comprises a metallic central conductor 41, an metallic external cylindrical conductor 42 which is connected to the ground, and an insulator 43 filling the inside the conductor 42 around the internal conductor 41.
  • One end 411 of the internal conductor 41 projects from a base face 44 of the connector 4 and is brazed collinearly on the corresponding end 12 of the first strip 11.
  • a edge 222 of the extremal plane 22 perpendicular to the ribbon 11 is applied against the connection face 4 and is welded to the external conductor 42 to be grounded.
  • the microwave line also comprises the wide and longitudinal rectangular conductive plane 24 having a predetermined width l4.
  • the plane 24 has a long side 241 which is parallel and opposite to a longitudinal side 211 of the second narrow strip 21 and which has ends 242 and 243 constituting second short longitudinal sides of the end conductive planes 22 and 23.
  • the earth conductor 2 appears a flat rectangular cavity 25 whose long sides are the opposite sides 211 and 241 of the strip 21 and the longitudinal plane 24 and whose short sides are large opposite sides opposite 223 and 233 of the extreme planes 22 and 23.
  • the length of the cavity 25 is equal to L, that is to say substantially less than that of the microwave line.
  • the length L for a predetermined width D of the cavity defines a longitudinal resonance frequency of the cavity which inhibits any lower standing wave frequency due to the initial symmetrical line resonance 11 + 21.
  • the cavity 25 thus behaves like a real low-pass filter whose cutoff frequency is equal to the lowest resonant frequency of the cavity.
  • the length of the cavity L is subdivided into N preferably identical sub-cavities 251 to 25 N each having a length substantially equal to L / N.
  • an intermediate narrow "wall" is provided consisting of a short transverse conductive strip 26 n which is perpendicular to the strips narrow longitudinal 21 and to the longitudinal flat ribbon 24 and connected to them.
  • the N-1 transverse ribbons 261 to 26 N-1 of length D are thin and have a width t equal to or less than those W1 and W2 of the ribbons 11 and 12.
  • Each transverse ribbon plays a role analogous to a shunt inductance between the conductors 21 and 24.
  • the number N and the dimensions, length L / N and width D, of the sub-cavities 251 to 25 N are chosen so as to ensure the best filtering of the low resonance frequencies, that is to say parasitic longitudinal resonances of the symmetrical line.
  • the integer N can be selected so that the smallest resonant frequency of each of the sub-cavities is greater than the maximum frequency of the useful band of the signals to be transmitted.
  • the lengths of the sub-cavities are different, or more generally the dimensions of the sub-cavities are different in order to select resonant frequencies and therefore predetermined cut-off frequencies.
  • the microwave line behaves like a low-pass filter having a cutoff frequency equal to the smaller of the two resonant frequencies of the two sub-cavities 251 and 252 which is associated with the longer of the sub-cavities.
  • the results of comparative measurements are presented below between a symmetrical line 11 + 21 + 22 + 23 of known type, on the one hand, and two lines according to the invention comprising elements 11, 21, 22 and 23 identical to that of the symmetrical line and a longitudinal conductive plane of earth 24.
  • the dielectric material used 3 was lithium niobate Li Nb O3.
  • the characteristic impedance of the balanced line is equal to 50 Ohms.
  • the measurements were made in the frequency band between 10 MHz and 6 GHz.
  • the first longitudinal resonance appears around 1 GHz.
  • the first longitudinal resonance only appears at 2.5 GHz.
  • the first one longitudinal resonance of the line L2 with two sub-cavities is twice greater and is equal to approximately 5 GHz.

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

Claims (9)

1. Symmetrische Ultrahochfrequenzübertragungsleitung, umfassend
   einen ersten Leiter (1) in der Form eines ersten schmalen flachen Bandleiters (11), der sich über die gesamte Länge der Leitung erstreckt und erste und zweite Enden (12, 13) aufweist, und
   einen zum ersten Leiter (1) koplanaren zweiten flachen Leiter (2), wobei der zweite Leiter umfaßt
   einen zweiten schmalen flachen Bandleiter (21), der sich parallel zum ersten schmalen Band (11) zwischen den ersten und zweiten Enden (12, 13) des ersten schmalen Bandes erstreckt, und
   erste und zweite äußerste im wesentlichen rechtwinklige Leiterebenen (22, 23), die mit den Enden des zweiten schmalen Bandes (21) verbunden sind und Seiten (221, 231) aufweisen, die jeweils zu den ersten und zweiten Enden (12, 13) des ersten schmalen Bandes im wesentlichen parallel sind,
   dadurch gekennzeichnet, daß der zweite Leiter (2) eine große Bandleiterlängsebene (24) umfaßt, die sich koplanar und parallel zu den ersten und zweiten schmalen Bändern (11, 21) über die gesamte Länge der Leitung erstreckt,
   wobei der große Bandleiter (24) Enden (242, 243) aufweist, die mit den ersten und zweiten äußersten ebenen Leitern (22, 23) jeweils verbunden sind, um in dem zweiten flachen Leiter einen Resonanzhohlraum (25) zu bilden, der durch die Längsseiten (211, 241) des zweiten schmalen Bandes (21) und des großen Bandes (24) und durch die Querseiten (223, 233) gegenüber den ebenen Leiterenden (22, 23) getrennt ist.
2. Ultrahochfrequenzübertragungsleitung nach Anspruch 1, dadurch gekennzeichnet, daß der zweite flache Leiter (2) einen Bandzwischenleiter (26₁) umfaßt, der in Querrichtung mit dem zweiten schmalen Band (21) und dem großen Band (24) verbunden ist, um den Hohlraum (25) in zwei Resonanzunterhohlräume (25₁, 25₂) abzuteilen.
3. Ultrahochfrequenzübertragungsleitung nach Anspruch 1, dadurch gekennzeichnet, daß der zweite flache Leiter (2) mehrere Bandzwischenleiter (26₁ bis 26N-1) umfaßt, die in Querrichtung mit dem zweiten schmalen Band (21) und dem großen Band (24) verbunden sind, um den Hohlraum (25) in mehrere Resonanzunterhohlräume (25₁ bis 25N) abzuteilen.
4. Ultrahochfrequenzübertragungsleitung nach Anspruch 1, dadurch gekennzeichnet, daß die kleinere Längsresonanzfrequenz des Hohlraumes (25) höher als das Nutzfrequenzband von durch die Leitung zu übertragenden Signalen ist.
5. Ultrahochfrequenzübertragungsleitung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die kleinere Längsresonanzfrequenz der Unterhohlräume (25₁ und 25₂; 25₁ bis 25N) höher als das Nutzfrequenzband der durch die Leitung zu übertragenden Signale ist.
6. Ultrahochfrequenzübertragungsleitung nach einem beliebigen der Ansprüche 2, 3 und 5, dadurch gekennzeichnet, daß die Unterhohlräume (25₁, 25₂; 25₁ bis 25N) identisch sind.
7. Ultrahochfrequenzübertragungsleitung nach einem beliebigen der Ansprüche 2, 3, 5 und 6, dadurch gekennzeichnet, daß ein Zwischenleiter (26₁ bis 26N-1) eine Breite (t) kleiner als die Breiten (W₁, W₂) der ersten und zweiten Bänder (11, 21) hat.
8. Ultrahochfrequenzübertragungsleitung nach einem beliebigen der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das große Band (24) und der Hohlraum (25) im wesentlichen gleiche Breiten (l₄, D) haben.
9. Ultrahochfrequenzübertragungsleitung nach einem beliebigen der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Breite (G) des Längszwischenraumes, der sich zwischen den ersten und zweiten schmalen Bändern (11, 21) erstreckt und die Breiten (W₁, W₂) der ersten und zweiten schmalen Bänder (11, 21) eindeutig kleiner als die Breite (D) des Hohlraumes (25) sind.
EP88401429A 1987-06-22 1988-06-10 Symmetrische Mikrowellenübertragungsleitung mit zwei koplanären Leitern Expired - Lifetime EP0296929B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8708729A FR2616973B1 (fr) 1987-06-22 1987-06-22 Ligne de transmission hyperfrequence a deux conducteurs coplanaires
FR8708729 1987-06-22

Publications (2)

Publication Number Publication Date
EP0296929A1 EP0296929A1 (de) 1988-12-28
EP0296929B1 true EP0296929B1 (de) 1992-04-29

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EP88401429A Expired - Lifetime EP0296929B1 (de) 1987-06-22 1988-06-10 Symmetrische Mikrowellenübertragungsleitung mit zwei koplanären Leitern

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US (1) US4871988A (de)
EP (1) EP0296929B1 (de)
JP (1) JPS6422101A (de)
DE (1) DE3870519D1 (de)
FR (1) FR2616973B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9400165A (nl) * 1994-02-03 1995-09-01 Hollandse Signaalapparaten Bv Transmissielijnnetwerk.
JP5089502B2 (ja) * 2008-06-26 2012-12-05 三菱電機株式会社 ブランチラインカプラおよびウィルキンソン分配回路
CN113555652A (zh) * 2021-07-02 2021-10-26 中国船舶重工集团公司第七二四研究所 一种微波信号连接器平动应力释放结构及其装配方法
CN114188691B (zh) * 2021-11-30 2023-02-24 赛莱克斯微系统科技（北京）有限公司 一种空气芯微同轴传输线的制造方法及生物传感器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205250A (en) * 1936-04-29 1940-06-18 Rca Corp Radio and other high frequency feeder arrangements
US3573670A (en) * 1969-03-21 1971-04-06 Ibm High-speed impedance-compensated circuits
US3573674A (en) * 1969-04-30 1971-04-06 Us Navy Tailored response microwave filter
US3688225A (en) * 1969-05-21 1972-08-29 Us Army Slot-line
USRE27755E (en) * 1971-10-14 1973-09-11 Cheng paul wen
US3846721A (en) * 1973-08-08 1974-11-05 Amp Inc Transmission line balun
US4233579A (en) * 1979-06-06 1980-11-11 Bell Telephone Laboratories, Incorporated Technique for suppressing spurious resonances in strip transmission line circuits
US4591812A (en) * 1982-11-22 1986-05-27 Communications Satellite Corporation Coplanar waveguide quadrature hybrid having symmetrical coupling conductors for eliminating spurious modes

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Publication number Publication date
JPS6422101A (en) 1989-01-25
DE3870519D1 (de) 1992-06-04
US4871988A (en) 1989-10-03
EP0296929A1 (de) 1988-12-28
FR2616973A1 (fr) 1988-12-23
FR2616973B1 (fr) 1989-07-07

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