EP2939307B1 - Niederleistungs- und hochgeschwindigkeits-mehrkanal-chip-zu-chip-schnittstelle mit einem dielektrischen wellenleiter - Google Patents

Niederleistungs- und hochgeschwindigkeits-mehrkanal-chip-zu-chip-schnittstelle mit einem dielektrischen wellenleiter Download PDF

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Publication number
EP2939307B1
EP2939307B1 EP13867509.5A EP13867509A EP2939307B1 EP 2939307 B1 EP2939307 B1 EP 2939307B1 EP 13867509 A EP13867509 A EP 13867509A EP 2939307 B1 EP2939307 B1 EP 2939307B1
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EP
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Prior art keywords
side board
board
electrical
waveguide
fiber
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EP13867509.5A
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English (en)
French (fr)
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EP2939307A1 (de
EP2939307A4 (de
Inventor
Hyeon Min Bae
Ha II SONG
Huxian JIN
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Korea Advanced Institute of Science and Technology KAIST
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Korea Advanced Institute of Science and Technology KAIST
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Priority claimed from KR1020130108857A external-priority patent/KR20140086808A/ko
Application filed by Korea Advanced Institute of Science and Technology KAIST filed Critical Korea Advanced Institute of Science and Technology KAIST
Publication of EP2939307A1 publication Critical patent/EP2939307A1/de
Publication of EP2939307A4 publication Critical patent/EP2939307A4/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/16—Dielectric waveguides, i.e. without a longitudinal conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides
    • H01P3/122—Dielectric loaded (not air)
    • 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 a board-to-board interconnection device with an electrical fiber.
  • US2006145778 discloses an RF interconnection between RF Printed Wiring Boards that includes a waveguide transmission line coupled between the RF Printed Wiring Boards.
  • Waveguide feed circuits are use to launch signals into and couple signals out of the transmission line.
  • the feed circuits are provided as micro-strip ("patch") antenna elements on Printed Wiring Board surfaces.
  • the ends of the waveguide are conductively attached to the ground planes of the respective Printed Wiring Boards.
  • US5528074 discloses a semiconductor device with a substrate that has a microwave semiconductor element, a microwave transmission line and a waveguide terminal structure.
  • the waveguide terminal structure is connected to an end of an external waveguide. Input and output of microwave signals between the semiconductor device and an external device are carried out simply by applying an end of the external waveguide to the waveguide terminal structure.
  • the external dielectric waveguide has a dielectric core, a dielectric cladding and ground metal film coating the cladding.
  • US2011194240 discloses a wireless communication unit with hinged sections. An antenna is located within a first section and a radio wave transceiver section is located in a second section. A waveguide assembly provides coupling through the sections such that the antenna is electrically coupled to the radio wave transceiver section. Part of the waveguide assembly is a flexible waveguide, and the document describes the possibility of using a flexible waveguide with a dielectric core and a conductive plating, which may be copper, gold, aluminum etc.
  • JP2008193161 discloses a micro strip line-waveguide converter to perform conversion between transmission modes of a micro strip line and a waveguide with a small transmission loss over a wide frequency band and having a flat frequency characteristic.
  • the waveguide is formed by a hollow metal pipe with rectangular cross section.
  • the micro strip line is provided on a substrate that extends perpendicularly to the axial direction of the pipe on the opening diameter of the pipe.
  • the end of the strip line is located over the rectangular cross section on the top of the substrate.
  • a conductor island is provides that form a patch antenna.
  • the substrate of JP2008193161 comprises a stack of a plurality of dielectric layers.
  • First holes penetrate the dielectric substrate layers outside an opening diameter of the waveguide.
  • Second holes penetrating only the top dielectric substrate layer, are located inside the opening diameter of the waveguide. This reduces the volume of the dielectric part of JP2008193161 , making it possible to suppress the occurrence of higher-order resonance mode in the in the dielectric substrate.
  • a board-to-board interconnection device according to claim 1 is provided.
  • An exemplary embodiment of the present invention may provide an improved interconnect instead of electrical wire line.
  • a novel type of dielectric waveguide named, for example, an electrical fiber may be presented to replace conventional copper line.
  • the electrical fiber may be defined as a dielectric waveguide with metal cladding.
  • Dielectrics with frequency independent attenuation characteristics may enable high data rate transfer with little or even without any additional receiver-side compensation.
  • Parallel channel data transfer may be available due to vertical coupling of the electrical fiber and PCB (printed circuit board).
  • the PCB with the electrical fiber for board-to-board interconnect between tranceiver I/O may be defined as a board-to-board interconnection device.
  • the interconnection device may comprise the electrical fiber, a transmitter side board, a receiver side board, a board-to-fiber connector, a microstrip feeding line, a slotted ground plane, a ground plane, and a patch.
  • a novel board-to-fiber connector may be presented to securely fix multiple the electrical fibers to PCB as close as to each other to maximize area efficiency.
  • Physically flexible characteristic of the electrical fiber may support to connect any termination in any location in free space.
  • the metal cladding of the electrical fiber may maintain the total transceiver power consumption regardless of a length of the electrical fiber.
  • the cladding also may isolate the interference of the signals in other wireless channels and adjacent electrical fibers, which typically may cause band-limitation problem.
  • Microstrip-to-waveguide transition may be adapted to minimize the reflection between microstrip and waveguide.
  • Microstrip-to-waveguide transition may transit microstrip signal into waveguide signal, and it may have the advantage of low cost because it may be available in general PCB manufacture process
  • FIG. 1 shows an isometric perspective view according to an exemplary embodiment of the invention.
  • FIG.1 may illustrate the electrical fiber 101 used as a board-to-board interconnect.
  • Incident signal may come from the 50-Ohm matched output of the transmitter die 102 to propagate along the transmission line 103 and then Microstrip-to-Waveguide Transition 104 (for example, MWT) on the transmitter side board may convert the microstrip signal into the waveguide signal.
  • the wave for example the waveguide signal, may transmit along the electrical fiber 101 and then may be converted into microstrip signal at the MWT 105 on the receiver side board.
  • signal may propagate along the transmission line 106 and then may go into the 50-Ohm matched receiver input 107.
  • the dielectric waveguide may propagate a signal from the transmitter side board to the receiver side board.
  • FIG. 2 shows a simplified model of the overall interconnect as a 2-Port network and a relation between reflected waves and transmitted waves at each transitions according to the exemplary embodiment of the present invention.
  • impedance discontinuity may lead to inefficient transmission of energy both from the transmission line to the waveguide and from the waveguide to the transmission line.
  • overall interconnect may be considered as the simple 2-port networks as FIG. 2 , Equation 1, Equation 2 and Equation 3.
  • the incident waves on the transmission line side and on the waveguide side may be expressed as u 1 + and w - , respectively. And, the reflected waves may be expressed as w + and u 1 ⁇ .
  • the incident waves on the waveguide side and on the transmission line side may be expressed as w +' and u 2 ⁇ .
  • the reflected waves may be expressed as w -' and u 2 + .
  • the following equations may express a scattering matrix (for example, S-parameter) of the overall interconnect.
  • u 1 ⁇ u 2 + S 11 S 12 S 21 S 22 ⁇ u 1 + u 2 ⁇
  • FIG. 3 shows a graph of analytic estimation and simulated results for S-parameters of the overall interconnect constructed in accordance with the invention.
  • FIG. 4 shows a graph of analytic estimation and simulated results for S-parameters of the overall interconnect constructed in accordance with the invention.
  • FIG. 5 shows a graph of anlytic estimation and simulated results for Group Delay of the overall interconnect constructed in accordance with the invention.
  • FIG. 3 , FIG. 4 , and FIG. 5 may show a graph of analytic estimation results for S-parameters of the overall interconnect constructed in accordance with the exemplary embodiment of the invention.
  • FIG. 3 , FIG. 4 , and FIG. 5 may plot the above equation 5, equation 6, equation 7, and equation 8 and indicate the result from the different case of waveguide length (for instance, 5cm and 10cm). And each result may be compared to the simulation results from 3D Electromagnetic Simulation Tool (Ansys. HFSS).
  • FIG. 3 , FIG. 4 , and FIG. 5 may say that there exists a waveguide-length- dependent-oscillation in the results of S-parameters and Group Delay of the overall interconnect.
  • the oscillation in the results of S-parameters and Group Delay may result from the fact that the reflected wave occured at the impedance discontinuity undergoes a slight attenuation along the propagation and it may make a phenomenon similar to what is happening in the cavity resonator.
  • the wave may bounce back and forth within the electrical fiber and reinforce the standing wave.
  • the MWT may be an object of the exemplary embodiment of the present invention to provide a lower reflection (r2).
  • FIG. 6 shows a side view of a waveguide to microstrip transition constructed in accordance with one embodiment of the invention.
  • FIG. 7 shows a front view of a waveguide to microstrip transition constructed in accordance with one embodiment of the invention.
  • FIG. 6 may show side view of the MWT and FIG. 7 may show front view of the MWT constructed in accordance with one embodiment of the invention.
  • the electrical fiber 604, 704 with a metal cladding 601,701 may be in contact with the microstrip circuit, especially with a patch element 603, 703 disposed on the board.
  • the metal cladding 601, 701 may wrap up a dielectric waveguide 602, 702.
  • the metal cladding 601, 701 may comprise a copper cladding
  • the patch element 603, 703 may comprise the microstrip line.
  • the patch element 603, 703 may radiate the signal at a resonance frequency.
  • the metal cladding 601, 701 may wrap up the dielectric waveguide 602, 702 with a predetermined form.
  • the predetermined form of the metal cladding 601, 701 may expose a middle of the dielectric waveguide 602, 702, and the predetermined form of the metal cladding 601, 701 may be punctured to expose a specific part of the dielectric waveguide 602, 702.
  • the predetermined form of the metal cladding 601, 701 may be various form.
  • FIG. 8 shows an exploded view of a waveguide to microstrip transition constructed in accordance with one embodiment of the invention.
  • FIG. 8 may show a detailed structure of each layer of the board.
  • the 3-layers structure may be used in the manufacture of the board.
  • the microstrip feeding line 801 may be located at a first floor, and the slotted ground plane 802, which is pierced by aperture, may be disposed on a second layer.
  • a patch element 803 and the ground plane 804 may be disposed on a third layer.
  • the microstrip feeding line 801 may feed the signal to the microstrip circuit at the first layer
  • the slotted ground plane 802 may include a slot to minimize a ratio of backward propagation wave to forward propagation wave at the second layer
  • the ground plane may include a via 807 to make an electrical connection between the slotted ground plane 802 and the ground plane 804 at the third layer.
  • a via 807 may be disposed as an array.
  • a core substrate 805 between the first and the second layer may be made of Taconic. CER-10 having dimensions of 12mm ⁇ 5.68mm and thickness of 0.28mm.
  • Another core substrate 806 between the second and the third layer may be made of Rogers. RO3010 Prepreg having dimensions of 12mm ⁇ 5.68mm and thickness of 0.287mm.
  • the Via 807 may play a role of making an electrical connection between the second and the third ground plane.
  • the microstrip width, the substrate thickness, the slot size, the patch size, the via diameter, the via spacing, the waveguide size, the waveguide material may be modified depending on a particular resonance frequency of the microstrip circuit and the mode of the propagation wave along the electrical fiber, as it will be apparent to one skilled in the art.
  • the size of the slot and the aperture may be an important factor in the transmission and reflection of the signal. Those sizes may be optimized to minimize the ratio of backward propagation wave to forward propagation wave by iterative simulation.
  • a cutoff frequency and an impedance of waveguide may be determined by the dimensions of the cross section and a kind of material used. For this invention, the dimensions of 2.9mm ⁇ 2.7mm and ECCOSTOCK PP (Laird TECHNOLOGIES.) may be used to pass 60 GHz band signal with a minimum reflection at the MWT.
  • FIG. 9 shows an exploded isometric view of different length of the electrical fiber with that of metal cladding and tapered waveguide constructed in accordance with one embodiment of the invention.
  • This strategy may be embodied by shortening a length of the metal cladding which wraps up the dielectric waveguide of the electrical fiber 901, 902, 903 at each end.
  • the metal cladding may perfectly confine the electromagnetic wave preventing a radiation loss of energy. For this reason, utilizing a short metal cladding may result in a large radiation loss. This kind of energy loss may be considered as an attenuation along the electrical fiber 901, 902, 903 and it may greatly influence the oscillation in the result of S-parameter.
  • the dielectric loss may be considered as attenuation along the electrical fiber 901, 902, 903. It may result from a tangent loss of the dielectric waveguide and be relevant to the length of waveguide. The dielectric loss dissipated along the long waveguide may reduce the effect of the oscillation.
  • long electrical fiber 903 may have bigger proportionality of metal cladding than short electrical fiber 901 while taking same amount of channel loss.
  • One end of the electrical fiber 904 may indicate the isometric drawing of a tapered waveguide. It may be for the impedance matching between the dielectrics used for the dielectric waveguide and the microstrip circuits on the board. For example, a proportionality of a length of the metal cladding on a length of the dielectric waveguide may be designed based on a length of the electrical fiber 901, 902, 903.
  • linearly shaping at least one of both ends of the dielectric waveguide may be efficient for finding optimal impedance.
  • at least one of both ends of the dielectric waveguide may be tapered for impedance matching between the dielectric waveguide and microstrip circuits.
  • at least one of both ends of the dielectric waveguide may be shaped linearly to optimize an impedance of the dielectric waveguide with largest power transfer efficiency.
  • the interconnection device with the electrical fiber 901, 902, 903 for a board-to-board interconnect between tranceiver I/O comprising, the electrical fiber 901, 902, 903 to propagate the signal from the transmitter side board to the receiver side board with the metal cladding and the microstrip circuit to contact with the electrical fiber 901, 902, 903 with the MWT.
  • FIG. 10 shows an isometric view of a board-to-waveguide connector constructed in accordance with an embodiment of the invention.
  • FIG. 10 may show an isometric view of the board-to-fiber connector 1001.
  • the electrical fiber may be firmly fixed to the board with the board-to-fiber connector 1001.
  • Connector bridges 1002, 1003 may be inserted into holes bored through the board to fix it on the board.
  • the board-to-fiber connector 1001 connects the electrical fiber to at least one of the transmitter side board and the receiver side board vertically.
  • transition apparatuses 1004, 1005, 1006 in the connector for physical fixation of the electrical fiber.
  • the electrical fiber may contact the microstrip circuit on the board. It may be a very efficient way for saving an area that the both end sides of the dielectric waveguide are vertically coupled with the transmitter side board and the receiver side board as illustrated in the FIG.10 . Because of this configuration, a number of the electrical fiber may be used to connect the multiple channels concurrently for a parallel system with wide bandwidth.
  • the dielectric waveguide may be vertically coupled with at least one of the transmitter side board and the receiver side board.
  • FIG. 11 shows a graph of simulated results for S-parameters of the overall interconnect constructed in accordance with one embodiment of the invention.
  • simulated results for S-parameters of the overall interconnect constructed in accordance with one embodiment of the invention may be shown in the graph.
  • the results may be achieved using the 50 cm electrical fiber.
  • a return loss of 10 dB a 15 GHz bandwidth, from 54 GHz to 79 GHz, may be achieved.
  • the insertion loss on the passband may be found to be less than 15 dB and also constant along the wide band.
  • FIG. 12 shows a graph of simulated results for Eye diagram of PAM4 28Gbps PRBS 2 14 -1 for 65GHz channel.
  • FIG. 12 may show an Eye-diagram of PAM4 28Gbps PRBS 2 14 -1.
  • the Eye-diagram may represent the demodulated data pattern which may be modulated on the 65 GHz carrier and passed through the channel of the interconnect constructed in accordance with an exemplary embodiment.
  • the electrical fiber may propose a new method to make high-speed data communication possible.
  • the MWT structure may transit the wideband signal while minimizing the reflection at the discontinuity.
  • the metal cladding which wraps up the dielectric waveguide may reduce the radiation loss and be effective to decrease the channel loss.
  • the electrical fiber may be promising solution to I/O channel having a demand to transmit data with very high-speed.
  • the electrical fiber may be able to replace the all copper wire line in the 100 Gbps backplane interface based on the IEEE 802.3 bj KR standard. And it may be applied to IEEE 802.3 bj SR standard with lengthened transmission distance.
  • a board-to-board interface may take the electrical fiber as a prospective solution in the datacenter market.

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  • Waveguides (AREA)
  • Combinations Of Printed Boards (AREA)
  • Waveguide Connection Structure (AREA)

Claims (6)

  1. Platine-zu-Platine-Verbindungsvorrichtung mit einer elektrischen Faser (101, 604, 704), die Verbindung umfassend:
    eine senderseitige Platine und eine empfängerseitige Platine;
    eine elektrische Faser (101, 604, 704), konfiguriert zum Verbreiten eines Signals von der senderseitigen Platine zu der empfängerseitigen Platine mit einer Metallummantelung (601, 701);
    einen Mikrostreifenstromkreis, angeordnet auf der senderseitigen Platine und der empfängerseitigen Platine und konfiguriert für Kontakt mit der elektrischen Faser (101, 604, 704) mit einem Mikrostreifen-zu-Wellenleiter-Übergang (105);
    wobei mindestens eines von beiden Enden der elektrischen Faser (101, 604, 704) verjüngt ist für Impedanzanpassung zwischen der elektrischen Faser und dem Mikrostreifen-Stromkreis auf der Verbindungsvorrichtung;
    einen Platine-zu-Faser-Konnektor (1001), konfiguriert zum vertikalen Verbinden von mehreren elektrischen Fasern (101, 604, 704) mit mindestens einer der senderseitigen Platine und der empfängerseitigen Platine;
    wobei der Platine-zu-Faser-Konnektor (1001) Folgendes umfasst:
    Konnektorbrücken (1002, 1003), eingesetzt in Löcher, gebohrt durch mindestens eine der senderseitigen Platine und der empfängerseitigen Platine;
    mehrere Übergangsvorrichtungen (1004, 1005, 1006) für physikalische Befestigung der mehreren elektrischen Fasern an jeweils mindestens einer der senderseitigen Platine und der empfängerseitigen Platine.
  2. Verbindungsvorrichtung nach Anspruch 1, wobei mindestens eines von beiden Enden der elektrischen Faser linear verjüngt ist, um eine Impedanz der elektrischen Faser mit einer größten Leistungsübertragungseffizienz zu optimieren.
  3. Verbindungsvorrichtung nach Anspruch 1, wobei die Metallummantelung eine Kupferummantelung umfasst.
  4. Verbindungsvorrichtung nach Anspruch 1, wobei eine Proportionalität einer Länge der Metallummantelung auf einer Länge der elektrischen Faser konzipiert ist auf der Basis einer Länge der elektrischen Faser.
  5. Verbindungsvorrichtung nach Anspruch 1, wobei die Verbindungsvorrichtung ferner umfasst:
    eine Mikrostreifen-Zuführleitung, konfiguriert zum Zuführen des Signals zu dem Mikrostreifen-Stromkreis an einer ersten Schicht;
    eine schlitzförmige Masseplatte mit einem Schlitz, konfiguriert zum Minimieren eines Verhältnisses von Rückwärtsverbreitungswelle zu Vorwärtsverbreitungswelle an einer zweiten Schicht;
    eine Masseplatte mit einer Anordnung von Lücken, konfiguriert um eine elektrische Verbindung zwischen der schlitzförmigen Masseplatte und der Masseplatte an der dritten Schicht herzustellen; und
    ein Patch, konfiguriert zum Ausstrahlen des Signals mit einer Resonanzfrequenz.
  6. Verbindungsvorrichtung nach Anspruch 1, wobei die Metallummantelung den dielektrischen Wellenleiter mit einer vorbestimmten Form aufwickelt.
EP13867509.5A 2012-12-27 2013-09-12 Niederleistungs- und hochgeschwindigkeits-mehrkanal-chip-zu-chip-schnittstelle mit einem dielektrischen wellenleiter Active EP2939307B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020120154094 2012-12-27
KR1020130108857A KR20140086808A (ko) 2013-09-11 2013-09-11 도파관을 이용한 멀티채널 칩대칩 저전력 고속 유선 인터페이스
PCT/KR2013/008240 WO2014104536A1 (en) 2012-12-27 2013-09-12 Low power, high speed multi-channel chip-to-chip interface using dielectric waveguide

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Publication Number Publication Date
EP2939307A1 EP2939307A1 (de) 2015-11-04
EP2939307A4 EP2939307A4 (de) 2016-11-02
EP2939307B1 true EP2939307B1 (de) 2018-10-03

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EP (1) EP2939307B1 (de)
JP (1) JP6177349B2 (de)
CN (1) CN104937768B (de)
WO (1) WO2014104536A1 (de)

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KR101693843B1 (ko) 2015-03-03 2017-01-10 한국과학기술원 마이크로스트립 회로 및 유전체 웨이브가이드를 이용한 칩-대-칩 인터페이스
KR101741616B1 (ko) * 2015-08-31 2017-05-30 전자부품연구원 멀티 채널 밀리미터 플라스틱 웨이브 가이드를 이용한 고속 데이터 통신 방법 및 시스템
KR102384505B1 (ko) 2016-01-12 2022-04-08 삼성전자주식회사 칩 간 무선 통신을 제공하기 위한 방법 및 장치

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EP2939307A1 (de) 2015-11-04
CN104937768B (zh) 2018-06-08
CN104937768A (zh) 2015-09-23
EP2939307A4 (de) 2016-11-02
WO2014104536A1 (en) 2014-07-03
JP2016506686A (ja) 2016-03-03
JP6177349B2 (ja) 2017-08-09

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