EP1592081B1 - Transition entre ligne microruban et guide d'ondes pour ondes millimétriques realiseé en une carte de circuits imprimés multicouche - Google Patents

Transition entre ligne microruban et guide d'ondes pour ondes millimétriques realiseé en une carte de circuits imprimés multicouche Download PDF

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Publication number
EP1592081B1
EP1592081B1 EP04425300A EP04425300A EP1592081B1 EP 1592081 B1 EP1592081 B1 EP 1592081B1 EP 04425300 A EP04425300 A EP 04425300A EP 04425300 A EP04425300 A EP 04425300A EP 1592081 B1 EP1592081 B1 EP 1592081B1
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European Patent Office
Prior art keywords
waveguide
transition
microstrip
multilayer
windows
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Expired - Lifetime
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EP04425300A
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German (de)
English (en)
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EP1592081A1 (fr
Inventor
Antonio Cifelli
Angelo Giuseppe Milani
Marco Polini
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Nokia Solutions and Networks SpA
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Nokia Solutions and Networks SpA
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Priority to DE602004024169T priority Critical patent/DE602004024169D1/de
Priority to ES04425300T priority patent/ES2334566T3/es
Priority to EP04425300A priority patent/EP1592081B1/fr
Priority to AT04425300T priority patent/ATE449434T1/de
Publication of EP1592081A1 publication Critical patent/EP1592081A1/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
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
    • H01P5/107—Hollow-waveguide/strip-line transitions

Definitions

  • the present invention relates to the field of microwave circuits and apparatuses and more precisely to a microstrip to waveguide transition for millimetric waves embodied in a multilayer printed circuit board.
  • the invention is referred both to a method for manufacturing the transition and the transition itself.
  • Microstrip to waveguide transitions embodied with high-loss dielectric substrates for PCB manufacturing are known in the art.
  • the Applicant of the present invention filed on 30-5-2002 an European patent application indicated as Ref.[1] in the REFERENCES listed at the end of the description.
  • Ref.[1] the operating frequency range of the transition was extending until to 35 GHz on fibre reinforced glass (FR4) substrates.
  • the multilayer board made use of a thick copper layer as second layer of the build-up wafer structure to provide mechanical stiffness to the FR4 substrate for the connection of a rectangular waveguide on the bottom face.
  • the copper layer was milled to lay bare the dielectric window of a slot transition and obtain in the meanwhile a sort of flange around it for mounting the waveguide.
  • the optimistic value of 80 GHz had been calculated for the only wave propagation along the microstrip without taking into due consideration the effects of microstrip to waveguide transitions.
  • Fig.1a shows a metallic layout laid down on the upper face of a dielectric FR4 substrate belonging to a multilayer structure.
  • the layout includes a microstrip which extends along the longitudinal symmetry axis of the substrate and terminates with a metal patch.
  • the microstrip and the remaining circuitry are encircled by a shielding metallic layout delimiting a rectangular unmetallized window, corresponding to a dielectric window, entered by the patched microstrip.
  • the perimetrical metallization of the dielectric window is shaped as a rectangular frame with four unmetallized circle at the four corners in correspondence of threaded holes through the multilayer structure.
  • Fig.1b shows a thick copper layer glued to the bottom face of the dielectric substrate to form a metal core giving stiffness to the multilayer structure and constituting a ground plane for the upper microstrip.
  • the metal core is milled and completely removed to lay bare the dielectric substrate in correspondence of the dielectric window, so that the patch is visible from the rear due to the semitransparency of the FR4 layer.
  • Fig.2a is a cross-section along the axis A-A of fig.1a .
  • the figure shows the structure of the multilayer including three dielectric substrates, and the metal core.
  • the upper and the lower dielectric substrates are metallized wile the interposed one is used as insulator.
  • the end of a rectangular waveguide joins the rectangular window milled in the metal core in correspondence of the dielectric window of the upper substrate, so that the opening in the metal core is a continuation of the waveguide to the dielectric window of the substrate.
  • a metallic lid placed upon the frame of the upper face is fixed to the multilayer structure by means of four screws at the corner of the frame penetrating into the upper dielectric substrate, the metal core (flange) and the walls of the rectangular waveguide.
  • the metallic lid is a hollow body with a rectangular recess faced to the unmetallized window. In operation, the patched end of the microstrip which comes into the dielectric window acts as an electromagnetic probe for radiating into the closed space around it.
  • the dimensions of the patch are calculate so as to transfer the energy from the feeding microstrip to the waveguide efficiently.
  • the screwed metallic lid is used as a reflector to prevent propagation from the patch in the opposite direction to the waveguide. To this aim the recess of metallic lid acts as a back short for the signal. From the above considerations it can be conclude that the probe and the dielectric window in communication with the waveguide constitute a microstrip to waveguide transition that transforms the "quasi-TEM" propagation mode of the microstrip into the TE 10 mode of the rectangular waveguide.
  • the electromagnetic properties of the transitions are reciprocal, so that the same structure used by the RF transmitter for conveying inside the waveguide a transmission signal from the microstrip is also used by the receiver for conveying a RF reception signal from the waveguide to the microstrip.
  • Fig.2b shows a series of metallized through holes (via-holes visible in Fig.2a ) regularly spaced along the frame.
  • These via-holes around the transition zone have been introduced successively the filing of Ref.[1] to the aim of improving the performances of the transition at the higher frequencies (35.5 GHz) of the operating range. This statement is possible because the transition at Ref.[1] and the transition of the present invention are both developed in the laboratories of the same Applicant.
  • the via-holes supply to the lack of continuity of the waveguide through the thickness of the dielectric substrate around the zone of the transition.
  • Fig.3 is a photography of the layout of the transceiver which depicts the real arrangement of via-holes; as it can be noticed, several rows of metallized holes are needed to a satisfactory operation in the SHF range (not in the EHF).
  • the European patent application indicated in Ref.[5] discloses a high-frequency package comprising a dielectric substrate, a high-frequency element that operates in a high-frequency region and is mounted in a cavity formed on said dielectric substrate, and a microstrip line formed on the surface or in an inner portion of said dielectric substrate and electrically connected to said high-frequency element, wherein a signal transmission passage of a waveguide is connected to a linear conducting passage or to a ground layer constituting the microstrip line.
  • an end of the linear conducting passage is electromagnetically opened, so that the end portion works as a monopole antenna inside the waveguide that is connected.
  • the aforementioned high-frequency package has been designed to operate at millimetric waves using costly and rigid substrate materials having a low dielectric constant and small losses (e.g. alumina).
  • the complicated structure makes the sealing of the multilayer to the waveguide and the application of an upper closing lid both difficult to obtain. Another difficult arises in correctly terminating the irradiating microstrip inside the waveguide.
  • the main object of the present invention is that to overcome the drawbacks of the known art and indicate a microstrip to waveguide transition obtainable on PCBs arranged for operating at the microwaves with good performances in the nearest EHF range (up to 80 GHz)
  • the invention achieves said object by providing a method to manufacture a microstrip to waveguide transition, as disclosed in the method claims.
  • Another object of the invention is a microstrip to waveguide transition obtained according to the method, as disclosed in the device claims.
  • the transition disclosed at Ref.[1] is now completely redesigned in order to remove almost completely the former dielectric diaphragm from the space of the transition.
  • Another fundamental difference from the prior art is that the waveguide now penetrates the dielectric substrate to connect the metallic lid, without breaking the continuity of the metallic walls, except for the two grooves whose effect is completely marginal.
  • the frame of via-holes is completely unnecessary to confine the electromagnetic field, and also the drawbacks highlighted at points 1 and 2 are overcome.
  • the waveguide part of the transition and the other mechanic part of the transceiver can be obtained by means of numerical control manufacturing techniques starting from a rough metal block.
  • Microstrip to waveguide transitions for rectangular waveguides according to the present invention are the easiest to obtain, but the same approach is applicable to obtain transitions for circular or elliptic waveguides.
  • a microstrip to waveguide transition, and vice versa, used to connect both the transmitter and the receiver amplifiers to the same antenna by means of a duplexer, is the only part of the transceiver the present invention is concerned with.
  • the substrate 1 gives support to a metallic layout including among other things a microstrip 2 placed along the axis of longitudinal symmetry of the figure.
  • the microstrip 2 terminates with a small patch 3 nearby the centre of a stripe 4 placed between two symmetric rectangular windows 5 and 6 obtained from the removal of the multilayer by milling (or drilling and sawing) according to the known techniques.
  • the area of the two windows 5 and 6 prevails with respect to the area of the central stripe 4 so that the space of the transition is filled prevalently with air.
  • a metallization 7 encircles, as a frame, the two symmetric windows 5 and 6 and the central stripe 4, leaving a short passage free for the microstrip 2, but having a finger 7a covering the stripe 4 for a short tract opposite to the patch 3.
  • Several metallized thorough holes 8 are regularly spaced along the perimeter of the frame 7. The only purpose of these holes is that of avoiding possible detachments of the upper dielectric layer from the metal core (plate) as a consequence of the milling operation for opening the windows 5 and 6, because of the not perfect physical compatibility at the interface between the two layers.
  • a partial top view of the mechanical part 9 of the transceiver is depicted.
  • the mechanic is manufactured in a way to include the end of a rectangular waveguide 10.
  • the internal cavity 11 of the metallic waveguide10 is filled up with air.
  • Two rectangular grooves 12 and 13 are milled for all the thickness of the two longer walls at the extremity of the waveguide 10, along the symmetry axis.
  • Four threaded holes 14 are visible at the four corners of the mechanical part 9.
  • the dimensions of the two windows 5 and 6 and the width of the stripe 4 are set to accommodate at the same time the stripe 4 into the grooves 12 and 13 at the edge of the waveguide 10 and the edge of the waveguide 10 inside the windows 5 and 6, as far as the depth of the grooves 12 and 13 allows it.
  • Fig.4c and fig.4d show the metal core before and after removal, respectively.
  • An indication of the real placement of the internal cross-section 11 of the waveguide 10 is added with dashed line in fig.4d . It can be appreciated that the stripe 4 is free from metal in correspondence of the cavity of the microwave 10, so that the tract of the patched microstrip 2, 3 penetrating the cavity 11 is free to radiate as a probe inside the waveguide 10.
  • Fig.5a shows a top view of the assembly constituted by the multilayer of fig.4a superimposed to the mechanic of fig.4b so as they can interpenetrate.
  • Two axes A-A and B-B are indicated in the figure as reference planes for the cross-sections reported in the successive figure.
  • Fig.5b shows the cross-section along the longitudinal symmetry axis A-A of fig.5a .
  • the edge of the waveguide 10 emerges from the openings 5 and 6 and a metallic lid 16 is leant on it.
  • the lid 16 is fastened to the waveguide 10 by means of screws 17 penetrating the four threaded holes 14 ( fig.4b ).
  • the lid 16 includes a central hollow 18 shaped as a very short tract of waveguide 10 closed at the end.
  • the lid 16 is now connected to the waveguide without any interposed dielectric layer, so that the metallic continuity of the walls of the waveguide 10 is never interrupted across the transition until the lid is reached. In this way the back currents reflected from the lid reach the ground directly and, as a consequence, via-holes around the transition as in fig.2b are unneeded for the reasons stated before.
  • Grooves 12 and 13 have different depths, the first one (12) is deeper than second one (13) to also include the copper finger 15a ( fig.4d ).
  • the microstrip 2 stops to be a as such only at the end of the groove 12, whose depth is calculated accordingly.
  • the depth of both the grooves 12 and 13 shall be calculated to assure a certain free space between the end of the waveguide 10 and the microstrip 2, and considering that a certain tolerance on the width of the grooves 12 and 13 is foreseen for the insertion of the stripe 4 without problems, as visible in fig.5a , the substrate 1 has to be fixed to the mechanic 1.
  • the transition has been designed to operate in the range of 55-60 GHz in accordance with the market request for the transceiver apparatuses.
  • the mechanic is worked by a numerical control machine so as to obtain a WR15 (1.88 x 3.76 mm) waveguide.
  • the planar circuitry is obtained starting form a multilayer including a dielectric substrate 0.1 mm thick glued to a copper metal plate (core) 2 mm thick is used.
  • the electromagnetic coupling between the microstrip 2 and the waveguide 10 is obtained by means of a probe laying on the E-plane of the rectangular waveguide 10 and terminating with the small patch 3. This probe has been obtained as continuation of the microstrip 2 inside the cavity 11 of the waveguide 10 after having removed the ground plane below.
  • the edge of the waveguide 10 emerges from the multilayer in the zone of the transition, as far as the depth of grooves 12 and 13 allows it, and joins the edge of the lid 16.
  • the top wall of lid 16 acts as a short circuit reflecting back the signal toward the patch 3. The latter has to see an open circuit on its plane for the reflected signal in order to keep it matched to the waveguide 10.
  • the required impedance transformation is obtained by milling the length of tract 18 in a way that the distance of the plane of the patch 3 from the short circuit plane internal to lid 16 is about ⁇ /4.
  • a first design of the 55-60 GHz transition has been performed roughly calculating the dimensions of its relevant parts with the help of two canonical books cited at Ref.[3] and Ref.[4].
  • the design has been refined successively by several simulation sessions performed by means of the electromagnetic simulator 3D AgilentTM HFSS operating on the model shown in fig.6a .
  • the goal is that to optimize the probe dimensions, inclusive of patch 3, for operating in the desired band maintaining the bandwidth and matching conditions as far as possible unaffected by mechanical and assembly tolerances.
  • fig.6a we see the model including the dielectric stripe 4 leant on the edge of the waveguide 10 transversally to its rectangular cavity 11.
  • This model also includes the slot comprised between groove 12 and lid 16, containing the relevant tract of microstrip 2.
  • the terminal part of the probe with the patch 3 is modelled inside the cavity 11 and represented with greater details in fig.6b .
  • fig.6b we see the microstrip 2 and patch 3 shaped as a T .
  • the base of the rectangular patch 3 perpendicular to the microstrip 2 has a length c greater than the height b , but this is not a general rule.
  • Labels w and h indicate respectively the longer and the shorter dimensions of the rectangular cavity 11, while label a indicates the length of the microstrip 2 (without copper below) inside the cavity 11 from the internal sidewall 12 to the base of the patch 3; i.e.: the length of the line which carries the signal to the patch 3.
  • the simulation results have confirmed that the central frequency of the transition depends on the ratio (a+b)/w, while the adaptation level at the input and the output ports depends on the ratio c/b inside the considered bandwidth.
  • the greater the ratio (a+b)/w i.e. the patch nearer to the centre of the cavity) the lower is the central frequency fo of the transition.
  • the insertion loss parameter S 21 reported in fig.11 is strongly influenced by the central microstrip which interconnect the two transitions.
  • the 20 mm length (about 7 ⁇ ) of the microstrip causes losses of about 1.5 dB, as a consequence each transition contributes to the measure with about 1.25 dB.
  • Fig.12 shows a top view of a microstrip to circular waveguide transition, without the upper lid, the embodiment of which is directly achievable from the preceding description of the microstrip to rectangular waveguide transition. The same applies for a microstrip to elliptic waveguide transition (not represented in the figure).

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Claims (16)

  1. Procédé de fabrication d'une transition de microruban à guide d'ondes, dans lequel la transition comprend :
    - une structure multicouche comprenant au moins un substrat diélectrique (1) du type utilisable dans la technologie des cartes de circuits imprimés ;
    - le substrat multicouche est prévu sur une plaque de métal rigide (15) ;
    - une topologie métallique (2, 3, 7) est supportée par le substrat diélectrique (1) ;
    - dans lequel la topologie métallique (2, 3, 7) inclut : un microruban (2) se terminant avec une fiche (3) agissant comme une sonde pour coupler le microruban (2) à un guide d'ondes (10) par l'intermédiaire du substrat diélectrique (1) ; et
    - deux fenêtres (5, 6) symétriques par rapport à un axe longitudinal de la topologie métallique (2, 3, 7), séparées l'une de l'autre par une bande (4) centrale portant la sonde ;
    le procédé inclut les étapes de :
    - suppression de la multicouche (1), de la plaque de métal rigide (15) et de la topologie métallique (2, 3, 7) en correspondance aux deux fenêtres (5, 6) ;
    - suppression de la plaque de métal rigide placée en-dessous de la bande (4) au moins dans la région entre les fenêtres ; fraisage de deux rainures (12, 13) rectangulaires de profondeur donnée pour la totalité de l'épaisseur de deux parois opposées à l'extrémité du guide d'ondes (10) le long de l'axe de symétrie ;
    - les dimensions des deux fenêtres (5, 6) et la largeur de la bande (4) sont fixées de façon à recevoir en même temps la bande (4) dans les rainures (12, 13) au niveau d'un bord du guide d'ondes (10) et ledit bord du guide d'ondes (10) à l'intérieur des fenêtres (5, 6), tant que la profondeur des rainures (12, 13) le permet ;
    - fixation d'un couvercle métallique (16) sur le bord du guide d'ondes (10) émergeant des deux côtés (5, 6) de la bande (4) pour réfléchir en retour vers le guide d'ondes (10) l'énergie rayonnée par la sonde (3) dans la direction opposée.
  2. Procédé selon la revendication 1, caractérisé en ce que la totalité de la superficie des deux fenêtres (5, 6) au niveau des deux côtés de la bande (4) prévaut par rapport à la superficie de la bande (4) centrale, de sorte que l'espace de la transition est rempli de façon prévalente avec de l'air.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il inclut l'étape d'alignement de la topologie métallique (2, 3, 7) par rapport au guide d'ondes (10) et de fixation de la multicouche à un corps de support métallique (9) qui a été travaillé pour obtenir le guide d'ondes (10).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il inclut l'étape de suppression de la plaque de métal rigide (15) de ladite bande (4) au moins en correspondance de la cavité (11) du guide d'ondes (10) traversée par la bande (4).
  5. Procédé selon la revendication 4, caractérisé en ce qu'il inclut l'étape de fraisage dans le corps dudit couvercle (16) d'un creux (18) central formé comme une courte zone dudit guide d'ondes (10) avec une profondeur d'environ λ/4.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'avant l'ouverture desdites fenêtres (5, 6) dans la multicouche (1, 15), une étape de perçage et de métallisation est mise en oeuvre pour encercler lesdites fenêtres (5, 6) et la bande (4) avec des trous traversants (7, 8) métallisés pour éviter des détachements possibles entre la couche diélectrique (1) et la plaque de métal rigide (15).
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites fenêtres (5, 6) ouvertes dans la multicouche (1, 15) ont une forme rectangulaire.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'il inclut l'étape de réglage de la fréquence centrale de la transition par fixation d'une valeur correspondante du rapport (a+b)/w, où : w est la dimension de cavité la plus longue d'un guide d'ondes rectangulaire dont la dimension la plus courte a un rapport connu avec w, a est la longueur de la ligne qui transporte le signal jusqu'à la fiche (3), et b est la base de la fiche (3) formée comme un rectangle perpendiculaire au microruban (2).
  9. Procédé selon la revendication 8, caractérisé en ce qu'il inclut l'étape d'optimisation de l'adaptation aux ports d'entrée et de sortie à l'intérieur de la bande de fréquences désirée par fixation du rapport c/b, où c est la hauteur de la fiche rectangulaire à l'intérieur de la largeur de bande considérée ; dans lequel la bande de fréquences désirée s'étend de 55 à 60 GHz ; dans lequel une couche diélectrique (1) avec une constante diélectrique relative εr d'approximativement 3,54 est utilisée et dans lequel l'épaisseur est environ 100 µm, la valeur de (a+b)/w est environ 0,18 et la valeur de c/b est environ 2,22.
  10. Transition de micro-onde à guide d'ondes fabriquée avec le procédé selon l'une quelconque des revendications 1 à 9.
  11. Transition selon la revendication 10, caractérisée en ce que les deux rainures (12, 13) opposées ont des profondeurs différentes et la plus profonde inclut le microruban (2) incluant la plaque de métal rigide (15).
  12. Transition selon la revendication 11, caractérisée en ce que les deux rainures (12, 13) opposées ont des dimensions transversales telles qu'elles se comportent comme deux guides d'ondes sous-jacents dans la plage de fréquences désirée de la transition apte à confiner le champ électromagnétique dans le volume de la transition.
  13. Transition selon l'une quelconque des revendications 10 à 12, caractérisée en ce que ledit guide d'ondes (10) est rectangulaire.
  14. Transition selon l'une quelconque des revendications 10 à 12, caractérisée en ce que ledit guide d'ondes (10) est circulaire.
  15. Transition selon l'une quelconque des revendications 10 à 12, caractérisée en ce que ledit guide d'ondes (10) est elliptique.
  16. Transition selon l'une quelconque des revendications 10 à 15, caractérisée en ce qu'elle inclut une couronne de trous traversants (7, 8) métallisés qui contient le bord du guide d'ondes (10) au niveau des deux côtés de la bande (4) pour éviter des détachements possibles entre la couche diélectrique (1) et la plaque de métal rigide (15).
EP04425300A 2004-04-29 2004-04-29 Transition entre ligne microruban et guide d'ondes pour ondes millimétriques realiseé en une carte de circuits imprimés multicouche Expired - Lifetime EP1592081B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE602004024169T DE602004024169D1 (de) 2004-04-29 2004-04-29 Mikrostreifenleiter-Hohlleiterübergang für in einer Mehrschichtleiterplatte gebildete Millimeterplatte
ES04425300T ES2334566T3 (es) 2004-04-29 2004-04-29 Transicion de microcinta a guia de onda para ondas milimetricas incorporadas en una tarjeta de circuitos impresos multicapas.
EP04425300A EP1592081B1 (fr) 2004-04-29 2004-04-29 Transition entre ligne microruban et guide d'ondes pour ondes millimétriques realiseé en une carte de circuits imprimés multicouche
AT04425300T ATE449434T1 (de) 2004-04-29 2004-04-29 Mikrostreifenleiter-hohlleiterübergang für in einer mehrschichtleiterplatte gebildete millimeterplatte

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Application Number Priority Date Filing Date Title
EP04425300A EP1592081B1 (fr) 2004-04-29 2004-04-29 Transition entre ligne microruban et guide d'ondes pour ondes millimétriques realiseé en une carte de circuits imprimés multicouche

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Publication Number Publication Date
EP1592081A1 EP1592081A1 (fr) 2005-11-02
EP1592081B1 true EP1592081B1 (fr) 2009-11-18

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AT (1) ATE449434T1 (fr)
DE (1) DE602004024169D1 (fr)
ES (1) ES2334566T3 (fr)

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EP1280392B1 (fr) 2001-07-26 2007-11-28 Siemens S.p.A. Panneau à circuit imprimé et son procédé de fabrication pour l'installation de puces à micro-ondes jusqu'à 80 Ghz
EP1367668A1 (fr) 2002-05-30 2003-12-03 Siemens Information and Communication Networks S.p.A. Système de transition entre microruban et guide d'ondes à large bande sur une carte de circuits imprimés multicouche

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2557472C1 (ru) * 2014-01-21 2015-07-20 Общество с ограниченной ответственностью "КВЧ-Комплекс" Волноводный переход от металлического волновода к диэлектрическому
CN112736394A (zh) * 2020-12-22 2021-04-30 电子科技大学 一种用于太赫兹频段的h面波导探针过渡结构
CN112736394B (zh) * 2020-12-22 2021-09-24 电子科技大学 一种用于太赫兹频段的h面波导探针过渡结构

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ES2334566T3 (es) 2010-03-12
EP1592081A1 (fr) 2005-11-02

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