EP3301751B1 - Elektronische vorrichtung mit isolierter antenne - Google Patents

Elektronische vorrichtung mit isolierter antenne Download PDF

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Publication number
EP3301751B1
EP3301751B1 EP17194574.4A EP17194574A EP3301751B1 EP 3301751 B1 EP3301751 B1 EP 3301751B1 EP 17194574 A EP17194574 A EP 17194574A EP 3301751 B1 EP3301751 B1 EP 3301751B1
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EP
European Patent Office
Prior art keywords
pole
conductive track
segment
transmission circuit
external connection
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EP17194574.4A
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English (en)
French (fr)
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EP3301751A1 (de
Inventor
Alain Tisne
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Sagemcom Energy and Telecom SAS
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Sagemcom Energy and Telecom SAS
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Publication of EP3301751A1 publication Critical patent/EP3301751A1/de
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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
    • H01P1/2007—Filtering devices for biasing networks or DC returns
    • 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
    • H01P1/20336—Comb or interdigital filters
    • H01P1/20345—Multilayer filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/30—Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability
    • 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
    • H01P5/187—Broadside coupled lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set

Definitions

  • the present invention relates to the protection of users of electronic devices against dangerous voltages.
  • the devices more particularly targeted by the invention comprise an external antenna and are for example energy meters, Internet gateways, connected objects (by "IOT” or Internet of Things) ...
  • the isolation includes optical couplers and / or galvanically isolated voltage converters connecting the transmission circuit to the main circuit.
  • the main drawback of this solution is that it is bulky and significantly increases the number of components of the electronic device.
  • the frequencies used belong to a wide frequency band and the isolation must be arranged so as not to attenuate the signal in the entire frequency band used.
  • the insulation requirements are very high and impose minimum distances between the parts to be insulated between them making it almost impossible to use a transformer with wound wires.
  • US7421265B1 discloses an electronic device comprising a housing containing a radiofrequency signal transmission circuit and an external connection intended to be connected to an external antenna.
  • US6018277A and US20070229368A1 disclose couplers connected between a radiofrequency signal transmission circuit and an antenna.
  • An object of the invention is to provide a means making it possible to protect the antenna of an electronic device against dangerous voltages without altering the performance of the latter or significantly increasing its size.
  • the electronic apparatus comprises a housing 1 containing a printed circuit board 2 (or PCB) multilayer on which is formed a main processing circuit, shown diagrammatically at 3, connected to a radiofrequency signal transmission circuit, shown diagrammatically 4.
  • the transmission circuit 4 is connected by a coupler 5 to an external connection 6 connected to an external antenna.
  • the transmission circuit 4 is arranged to allow the insertion of data into a signal intended to be transmitted by radiofrequency waves via the external antenna 7 or to extract data from a signal received by the external antenna 7 in the form of radiofrequency waves.
  • the antenna 7 is also known in itself and connected by a coaxial cable to the connection 6 which comprises a connector of the coaxial type.
  • the coupler 5 comprises at least one pair of a first conductive track, generally designated at 8.1, and of a second conductive track, generally designated at 8.2, extending on either side of a substrate. or dielectric 9 having main faces (that is to say those of their faces which have the largest area) facing each other in order to establish between them a coupling by transverse electromagnetic wave.
  • the conductive track 8.1 is parallel to the conductive track 8.2.
  • the conductive tracks are conventionally formed on the printed circuit board 2, the dielectric 9 being formed by a thickness of insulating material of the printed circuit board 2 extending between the conductive track 8.1 and the other conductive track 8.2. go. The thickness and the dielectric constant of the dielectric 9 separating the conductive tracks 8.1, 8.2 determine the insulation performance.
  • the first conductive track 8.1 comprises a first section 8.11 having a first end connected to a first pole 11 of the transmission circuit 4 and a second end connected by an intermediate section 8.13 at a first end of a second section 8.12 of the first conductive track 8.1 which has a second end connected to a second pole 12 of the transmission circuit 4.
  • the second pole 12 of the transmission circuit is rectangular in shape and is not opposite the second conductive track 8.2.
  • the second pole 12 is here formed by a ground of the transmission circuit 4.
  • the connection to the first pole 11 is not shown on the figure. figure 3 : it can be carried out by a cable extending above the earth of the transmission circuit 4.
  • the second conductive track 8.2 has a first section 8.21 having a first end connected to a first pole 21 of the external connection 6 and a second end connected by an intermediate section 8.23 to a first end of a second section 8.22 of the second track 8.2 which has a second end connected to a second pole 22 of the external connection 6.
  • the second pole 22 of the connection 6 is rectangular in shape and is not opposite the first conductive track 8.1.
  • the second pole 22 is here formed by a mass of the connection 6.
  • the connection to the first pole 21 is not shown on the figure. figure 3 : it can be achieved by a cable extending above the earth of the external connection 6.
  • Sections 8.11, 8.12 are parallel to each other as well as to sections 8.21, 8.22.
  • Each section 8.11, 8.12 of the first conductive track 8.1 extends along an axis X facing one of the sections 8.21, 8.22 of the conductive track 8.2 on either side of the dielectric 9.
  • the intermediate section 8.13 extends along a Y axis perpendicular to sections 8.11, 8.12 and does not extend facing the second pole 22.
  • the intermediate section 8.23 is perpendicular to sections 8.21, 8.22 and does not extend facing the second pole 12.
  • the main faces of the first sections 8.11, 8.21 and of the second sections 8.12, 8.22 have a length of 20 mm and a width of 3.5 mm; and the dielectric 9 has a thickness of 600 ⁇ m and a dielectric constant of 4.5.
  • Such an arrangement makes it possible to withstand a voltage of 8000 V while allowing the transmission of signals having frequencies between 700 MHz and 2700 MHz.
  • the flow of a current in the first section 8.11 and the second section 8.12 of the first conductive track 8.1 generates, in the first section 8.21 and the second section 8.22 of the second conducting track 8.2, the flow of a current induced of the same value but of opposite sign.
  • the flow of a current in the first section 8.21 and the second section 8.22: of the second conductive track 8.2 generates the flow of an induced current in the first section 8.11 and the second section 8.12 of the first conductive track 8.1.
  • the second poles 12, 22 are L-shaped and include a first part 12x, 22x and a second part 12y, 22y.
  • the first parts 12x, 22x extend along the X axis and the second parts 12y, 22y extend along the Y axis.
  • a free edge 12a of the second part 12y of the second pole 12 is connected to the second section 8.12 of the first conductive track 8.1.
  • a free edge 22a of the second part 22y of the second pole 22 is connected to the second section 8.22 of the second conductive track 8.2.
  • the second poles 12, 22 are not opposite the first and second conductive tracks 8.1, 8.2. More particularly, the free edge 12a is at the limit of overlap with the second conductive track 8.2 and the free edge 22a is at the limit of overlap with the first conductive track 8.1.
  • the covering of the second poles 12, 22 by the first and second conductive tracks 8.1, 8.2 has the effect of reducing the passband of the coupler.
  • Tests have shown that, more generally, the greater the overlap of the second parts 12y, 22y of the second poles 12, 22, the smaller the width of the passband of the coupler.
  • the width of the passband is optimum when the free edges 12a, 22a are substantially at the limit of overlap with the first and second conductive tracks 8.1, 8.2 respectively.
  • the first conductive track 8.1 comprises a first section 8.11 and two second sections 8.12 which are parallel to each other as well as to a first section 8.21 and to two second sections 8.22 of the second conducting track 8.2.
  • Each section 8.11, 8.12 of the first conductive track 8.1 extends opposite one of the sections 8.21, 8.22 of the conductive track 8.2 on either side of the dielectric 9.
  • the first section 8.11 of the first conductive track 8.1 has a first end connected to the first pole 11 of the transmission circuit 4 and a second end connected, by intermediate sections 8.13, to the two second sections 8.12 of the first conductive track 8.1 which are, them, connected in parallel to the second pole 12 of the transmission circuit 4.
  • the first section 8.21 of the second conductive track 8.2 has a first end connected to the first pole 21 of the external connection 6 and a second end connected, by intermediate sections 8.23 , to the two second sections 8.22 of the second conductive track 8.2 which are themselves connected in parallel to the second pole 22 of the external connection 6.
  • the intermediate sections 8.13 are perpendicular to the sections 8.11, 8.12 and do not extend opposite the second pole 22.
  • the intermediate sections 8.23 are perpendicular to the sections 8.21, 8.22.
  • the second pole 22 of the connection 6 is here formed by a ground of the connection 6.
  • the connection to the first pole 11 is not shown here on the figure 9 : it can be carried out by a cable extending above the earth of the transmission circuit 4.
  • the main faces of the first sections 8.11, 8.21 and of the second sections 8.12, 8.22 have a length of 20 mm and a width of 2.8 mm; and the dielectric 9 has a thickness of 600 ⁇ m and a dielectric constant of 4.5.
  • Such an arrangement makes it possible to withstand a voltage of 8000 V while allowing the transmission of signals having frequencies between 1300 MHz and 3100 MHz.
  • the second poles 12, 22 are T-shaped and include a first part 12x, 22x and a second part 12y, 22y.
  • the first parts 12x, 22x extend along the X axis and the second parts 12y, 22y extend along the Y axis.
  • a free edge 12a of the second part 12y of the second pole 12 is connected to the second sections 8.12 of the first conductive track 8.1.
  • a free edge 22a of the second part 22y of the second pole 22 is connected to the second sections 8.22 of the second conductive track 8.2.
  • the second poles 12, 22 are not opposite the first and second conductive tracks 8.1, 8.2. More particularly, the free edge 12a is at the limit of overlap with the second conductive track 8.2 and the free edge 22a is at the limit of overlap with the first conductive track 8.1.
  • the second poles 12, 22 are, as before, T-shaped.
  • the difference lies in that the second poles 12, 22 are now partially opposite the first conductive track 8.1 and the second conductive track 8.2. More particularly, the part 12y of the second pole 12 is completely covered by the second conductive track 8.2, and the part 22y of the second pole 22 is completely covered by the first conductive track 8.1.
  • the figure 12 represents signals S11, S21 of the first poles 11, 21 of the coupler illustrated on figure 10 .
  • the bandwidth at 1dB extends here from 0.7 to 3 GHz (GigaHertz).
  • the figure 13 represents signals S11, S21 of the first poles, 11, 21 of the coupler illustrated on figure 11 .
  • the bandwidth at 1dB extends here from 0.7 to 2 GHz (GigaHertz).
  • the covering of the second poles 12, 22 by the first and second conductive tracks 8.1, 8.2 thus has the effect of reducing the passband of the coupler.
  • Tests have shown that more generally, the greater the overlap of the second parts 12y, 22y of the second poles 12, 22, the smaller the width of the passband of the coupler.
  • the width of the passband is optimum when the free edges 12a, 22a are substantially at the limit of overlap with the first and second conductive tracks 8.1, 8.2 respectively.
  • the coupler comprises a matching capacitor 31 mounted between the first section 8.11 of the first conductive track 8.1 and the second pole 11 of the circuit transmission 4 and a matching capacitor 32 mounted between the first section 8.21 of the second conductive track 8.2 and the second pole 21 of the external connection 6.
  • the function of the matching capacitors 31, 32 is to compensate for the inductive behavior of the low frequency coupler impedance: they therefore make it possible to increase the bandwidth of the coupler by allowing the transmission of signals having frequencies between 600 MHz and 3100 MHz.
  • the matching capacitors 31, 32 are simply, in this first variant, passive components soldered to the poles 11, 21 and the sections 8.11, 8.21 concerned.
  • the first section 8.11 of the first conductive track 8.1 is connected to the first pole 11 of the transmission circuit 4 via the capacitor 31 and by the core of a coaxial cable 41 extending over the ground of the transmission circuit 4 and the first section 8.21 of the second conductive track 8.2 is connected to the first pole 21 by the capacitor 32 and the core of a coaxial cable 42 extending over the ground of the external connection 6.
  • the first section 8.11 of the first conductive track 8.1 is connected to the first pole 11 of the transmission circuit 4 by a coplanar conductive track 51 in the ground plane forming the mass of the transmission circuit 4 and the first section 8.21 of the second conductive track 8.2 is connected to the first pole 21 by a coplanar conductive track 52 in the ground plane forming the ground of the external connection 6.
  • the matching capacitors 31, 32 respectively mounted between the first section 8.11 of the first conductive track 8.1 and the first pole 11 of the transmission circuit 4 and between the first section 8.21 of the second conductive track 8.2 and the first pole 21 of the external connection 6 are formed by conductive pads extending in planes parallel to the conductive tracks 8.1, 8.2.
  • the first end of the first section 8.11 of the first conductive track 8.1 is covered with a dielectric layer itself covered with a pad 61 so as to form a capacitor between said first end and said pad 61.
  • the first end of the first section 8.21 of the second conductive track 8.2 is covered with a dielectric layer itself covered with a pad so as to form a capacitor between said first end and said pad.
  • Said pad 61 is then connected to the first pole 11, 21 here by a conductive track, or alternatively by a cable or the like.
  • the intermediate sections can be replaced by cables.
  • One of the matching capacitors can be a passive component and the other a capacitor formed by conductive pads separated from each other by a dielectric.
  • the conductive tracks can be connected to the poles directly or indirectly.
  • the coupler 5 can be produced on the printed circuit board 2 or on a daughter board attached to the printed circuit board 2 for example to extend parallel or perpendicular thereto.
  • the electronic circuit of the device may be different from that described.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Near-Field Transmission Systems (AREA)
  • Transmitters (AREA)
  • Details Of Aerials (AREA)

Claims (10)

  1. Elektronisches Gerät, umfassend ein Gehäuse (1), das einen Schaltkreis (4) zur Übertragung von Funkfrequenzsignalen einschließt, und eine äußere Verbindung (6), die dazu bestimmt ist, mit einer äußeren Antenne (7) verbunden zu werden, wobei der Übertragungsschaltkreis mit der äußeren Verbindung über einen Koppler (5) verbunden ist, der mindestens ein Paar aus einer ersten Leiterbahn (8.1) und einer zweiten Leiterbahn (8.2) umfasst, die sich zu beiden Seiten eines Dielektrikums (9) erstrecken und dabei Hauptflächen haben, die zumindest teilweise einander gegenüberliegen, um zwischen sich eine Kopplung mittels transversalelektromagnetischer Welle herzustellen, wobei die erste Leiterbahn einen ersten Pol (11) des Übertragungsschaltkreises mit einem zweiten Pol (12) des Übertragungsschaltkreises verbindet, wobei die zweite Leiterbahn einen ersten Pol (21) der äußeren Verbindung mit einem zweiten Pol (22) der äußeren Verbindung verbindet, dadurch gekennzeichnet, dass mindestens einer der zweiten Pole (12, 22) in Bezug auf die diesem Pol gegenüberliegende Leiterbahn (8.1, 8.2) derart versetzt ist, dass er sich nicht gegenüber der genannten gegenüberliegenden Leiterbahn erstreckt, und dass ein freier Rand des genannten mindestens einen der zweiten Pole (12, 22) an der Überdeckungsgrenze mit der genannten Leiterbahn (8.1, 8.2) ist, die dem Pol gegenüberliegt.
  2. Gerät nach einem der vorhergehenden Ansprüche, bei dem der zweite Pol (12) des Übertragungsschaltkreises (5) mit einer Masse des Übertragungsschaltkreises verbunden ist, und der zweite Pol (22) der äußeren Verbindung (6) mit einer Masse der äußeren Verbindung verbunden ist.
  3. Gerät nach einem der vorhergehenden Ansprüche, bei dem die erste Leiterbahn (8.1) mindestens einen ersten Abschnitt (8.11) und einen zweiten Abschnitt (8.12) umfasst, die parallel zu einem ersten Abschnitt (8.21) und einem zweiten Abschnitt (8.22) der zweiten Leiterbahn (8.2) sind, wobei jeder erste Abschnitt ein Ende hat, das mit dem entsprechenden ersten Pol (11, 21) verbunden ist, sowie ein Ende, das mit dem zweiten Abschnitt verbunden ist, der mit dem entsprechenden zweiten Pol (12, 22) verbunden ist.
  4. Gerät nach Anspruch 3, bei dem der erste Abschnitt (8.11, 8.21) und der zweite Abschnitt (8.12, 8.22) mindestens einer der Leiterbahnen (8.1, 8.2) miteinander über einen Zwischenabschnitt (8.13, 8.23) der Leiterbahn verbunden sind, der sich nicht gegenüber dem zweiten Pol (12, 22) der anderen Leiterbahn erstreckt.
  5. Gerät nach einem der Ansprüche 1 bis 2, bei dem die erste Leiterbahn (8.1) mindestens einen ersten Abschnitt (8.11) und zwei zweite Abschnitte (8.12) umfasst, die parallel zu einem ersten Abschnitt (8.21) und zu zwei zweiten Abschnitten (8.22) der zweiten Leiterbahn (8.2) sind, wobei jeder erste Abschnitt ein Ende hat, das mit dem entsprechenden ersten Pol (11, 21) verbunden ist, sowie ein Ende, das mit den zweiten Abschnitten verbunden ist, die parallel zu dem entsprechenden zweiten Pol (12, 22) angeschlossen sind.
  6. Gerät nach Anspruch 5, bei dem der erste Abschnitt (8.11, 8.21) und die zweiten Abschnitte (8.12, 8.22) mindestens einer der Leiterbahnen (8.1, 8.2) miteinander über einen Zwischenabschnitt (8.13, 8.23) der Leiterbahn verbunden sind, der sich nicht gegenüber dem zweiten Pol (12, 22) der anderen Leiterbahn erstreckt.
  7. Gerät nach einem der vorhergehenden Ansprüche, bei dem der Koppler (5) einen Anpassungskondensator (31) umfasst, der zwischen dem ersten Pol (11) des Übertragungsschaltkreises (4) und der ersten Bahn (8.1) geschaltet ist, und einen Anpassungskondensator (32), der zwischen dem ersten Pol (21) der äußeren Verbindung (6) und der zweiten Bahn (8.2) geschaltet ist.
  8. Gerät nach Anspruch 5, bei dem mindestens einer der Anpassungskondensatoren (31, 32) durch leitende Bereiche (61) gebildet ist, die sich in Ebenen erstrecken, die parallel zu den Leiterbahnen sind.
  9. Gerät nach einem der vorhergehenden Ansprüche, bei dem die erste Leiterbahn (8.1) mit dem ersten Pol (11) des Übertragungsschaltkreises (4) durch die Seele eines Koaxialkabels (41) verbunden ist, das sich über einer Masseebene erstreckt, die die Masse des Übertragungsschaltkreises bildet, und/oder die zweite Leiterbahn (8.2) mit dem ersten Pol (21) der äußeren Verbindung (6) durch die Seele eines Koaxialkabels (42) verbunden ist, das sich über einer Masseebene erstreckt, die die Masse der äußeren Verbindung bildet.
  10. Gerät nach einem der vorhergehenden Ansprüche 1 bis 8, bei dem die erste Leiterbahn (8.1) mit dem ersten Pol (11) des Übertragungsschaltkreises (4) über eine Leiterbahn (51) verbunden ist, die sich durch eine Masseebene erstreckt, die die Masse des Übertragungsschaltkreises bildet, und/oder die zweite Leiterbahn (8.2) mit dem ersten Pol (21) der äußeren Verbindung (6) über eine Leiterbahn (52) verbunden ist, die sich durch eine Masseebene erstreckt, die die Masse der äußeren Verbindung bildet.
EP17194574.4A 2016-10-03 2017-10-03 Elektronische vorrichtung mit isolierter antenne Active EP3301751B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1659527A FR3057111B1 (fr) 2016-10-03 2016-10-03 Dispositif electronique a antenne isolee

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EP3301751A1 EP3301751A1 (de) 2018-04-04
EP3301751B1 true EP3301751B1 (de) 2020-08-19

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI103614B (fi) * 1997-03-20 1999-07-30 Nokia Mobile Phones Ltd Vaiheistus- ja balansointielin
US20070229368A1 (en) * 2004-08-27 2007-10-04 Hiroshi Hata Planar coupler and integrated antenna system
US7421265B1 (en) * 2005-03-04 2008-09-02 Cisco Technology, Inc. Selectable network antenna systems and methods
JP4236663B2 (ja) * 2005-07-28 2009-03-11 Ｔｄｋ株式会社 電子デバイスおよびフィルタ

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* Cited by examiner, † Cited by third party
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EP3301751A1 (de) 2018-04-04
FR3057111A1 (fr) 2018-04-06
FR3057111B1 (fr) 2020-10-30

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