FR2852743A1 - Electronic plates connecting arrangement for portable radio-telephone, has matching section modifying direction of EM field between microstrip line and contact zone, in parallel to direction of field in connector - Google Patents

Electronic plates connecting arrangement for portable radio-telephone, has matching section modifying direction of EM field between microstrip line and contact zone, in parallel to direction of field in connector Download PDF

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Publication number
FR2852743A1
FR2852743A1 FR0303458A FR0303458A FR2852743A1 FR 2852743 A1 FR2852743 A1 FR 2852743A1 FR 0303458 A FR0303458 A FR 0303458A FR 0303458 A FR0303458 A FR 0303458A FR 2852743 A1 FR2852743 A1 FR 2852743A1
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France
Prior art keywords
printed
plate
characterized
comprises
connector
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Granted
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FR0303458A
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French (fr)
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FR2852743B1 (en
Inventor
Gwenael Guillois
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CELLON FRANCE Sas
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CELLON FRANCE SAS
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Priority to FR0303458A priority Critical patent/FR2852743B1/en
Publication of FR2852743A1 publication Critical patent/FR2852743A1/en
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Publication of FR2852743B1 publication Critical patent/FR2852743B1/en
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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/14Structural association of two or more printed circuits
    • H05K1/142Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/04Fixed joints
    • H01P1/047Strip line joints
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/0213Electrical arrangements not otherwise provided for
    • H05K1/0216Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0218Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
    • H05K1/0219Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/0213Electrical arrangements not otherwise provided for
    • H05K1/0237High frequency adaptations
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/07Electric details
    • H05K2201/0707Shielding
    • H05K2201/0715Shielding provided by an outer layer of PCB
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09Shape and layout
    • H05K2201/09209Shape and layout details of conductors
    • H05K2201/0929Conductive planes
    • H05K2201/09336Signal conductors in same plane as power plane
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09Shape and layout
    • H05K2201/09209Shape and layout details of conductors
    • H05K2201/09654Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09727Varying width along a single conductor; Conductors or pads having different widths

Abstract

<P> The invention provides an arrangement for electrically connecting two electronic boards (10, 14), in which a transmission line for electromagnetic waves (12, 16) is printed on each board, at least the transmission line (12 ) of the first plate (10) being printed according to a microstrip structure, and of the type which comprises a connector (36) comprising a transverse alignment of pins (52) longitudinal which connects the transmission lines (12, 16) of the two plates (10, 12), characterized in that the first plate (10) comprises a contact zone (50) arranged in line with the connector (36) and an adaptation section (54) which connects the microstrip line (48) to the contact area (50), in particular to modify the orientation of the electromagnetic field between the microstrip line (48) and the contact area (50) .Application to one or more antennas of a portable radiotelephone. </P>

Description

"Arrangement for connecting two electronic printed circuit boards by a connector

  ZIF or LIF, a section in coplanar structure

  and a section in microstrip structure. "The invention proposes an arrangement for the connection of two electronic modules via a connector of the type with zero insertion force or of the type with low insertion force.

  The invention more particularly proposes an arrangement 10 for electrically connecting two electronic printed circuit boards, of the type in which a transmission line of electromagnetic waves is printed on each plate, at least the transmission line of the first plate being printed according to a structure with microstrip, and of the type which comprises a connector comprising a transverse alignment of longitudinal pins which connects the transmission lines of the two plates.

  The current trend in portable radiotelephones is to reduce the external dimensions of the device. Thus, the dimensions of the various printed circuits are also reduced.

  The efficiency of the emitting / receiving antenna of electromagnetic waves depends in part on the area of a ground circuit of all the printed circuits. Thus, the reduction in the dimensions of the various printed circuits implies the reduction of the area of the ground circuit, including a decrease in the efficiency of the antenna.

  To overcome this effect, it has been proposed to use an additional printed circuit on which an additional ground circuit 30 is printed to extend the ground circuit.

  The electronic part of the radiotelephone then consists of an arrangement of several modules which can be chosen according to the characteristics of the radiotelephone which it is desired to obtain, and which can be connected together by suitable conventional means.

  There is shown in Figure 1 an arrangement consisting of a first module 10 which comprises the printed circuit 12 connected to the 5 electronic components, and consisting of a second module 14 which comprises the extension 16 of the printed circuit.

  This arrangement is a part of the radiotelephone antenna and it has the functions of transmitting the electromagnetic waves between electronic components (radio) and a radiating element of the antenna, which transmits / receives the electromagnetic waves to / from other electronic devices.

  Thus, the antenna successively comprises the electronic component, the first module 10, the second module 14 and 15 the radiating element.

  The printed circuit 12 of the first module 10 forms a line for transmitting electromagnetic waves which comprises a supply conductive element 18, or line 50 ohms, by which the waves emitted / received by the antenna are transmitted from / to the electronic component, and a second conductive element 20 forming a so-called "ground" circuit.

  The additional printed circuit 16 also includes a supply conductive element 22 and a second ground conductive element 24.

  According to a known embodiment, the two modules 10, 14 are connected to each other by means of a coaxial cable 26 consisting mainly of a central conductor 28, which connects the two supply conductive elements 18, 22 to each other , a peripheral conductor 30, which connects the two elements 30 ground conductors 20, 24 together, and insulating material 32 separating the two conductors 28, 30.

  The connection of the two modules 10, 14 also requires an adaptation connector 34 arranged on each module 10, 14.

  The use of a coaxial cable 26 and the associated adapter connectors 34 proves to be particularly expensive.

  In order to solve the problems linked to the use of a coaxial cable to connect the two modules 10, 14, it has been proposed to use a connector of the type with zero insertion force, called "ZIF" connector (for Zero Insertion Force), or a connector of the low insertion force type, called LIF connector (for Low Insertion Force).

  However, although such a type of connector is of reduced bulk and cost compared to a coaxial cable, the link using this type of connector can cause a loss of the transmitted power.

  Indeed, the printed circuit of the first module 10 generally has a so-called microstrip structure, that is to say 15 comprising a ribbon of conductive material printed on a first face of the module 10, forming the supply conductor 18, a layer of conductive material forming the ground conductor 20, distributed on the two faces of the module 10.

  These two conductors 18, 20 are printed on two different parallel planes 20, so that the orientation of the electromagnetic field formed by the electromagnetic waves transmitted by the printed circuit 12 is generally perpendicular to the planes of the two conductors 18, 20.

  The ZIF or LIF connector mainly consists of 25 longitudinal pins of conductive material, which are aligned in a transverse direction. The electromagnetic field which crosses this connector is oriented generally transversely.

  Thus, the transition between the printed circuit 12 and the ZIF or LIF connector is characterized by a sudden modification of the orientation of the electromagnetic waves, of the order of 900, which has the effect of causing a reflection of the waves to be transmitted. and therefore transmission losses, we then speak of "reflection losses".

  The object of the invention is to propose an arrangement for connecting a printed circuit according to a microstrip structure to a ZIF or LIF connector, which does not cause transmission losses of electromagnetic waves.

  To this end, the invention provides an arrangement of the type described above, characterized in that the first plate comprises a contact area arranged in line with the connector and an adaptation section which connects the microstrip line to the contact area, in particular to modify the orientation of the electromagnetic field between the microstrip line and the contact zone.

  According to other characteristics of the invention: - the adaptation section is printed according to a coplanar structure; - The second plate comprises a contact zone 15 arranged in line with the connector and the transmission line of the second plate comprises at least one section printed according to a coplanar structure which is connected to the contact zone; the transmission line of the second plate comprises a single section in coplanar structure which is printed on a single face of the second plate.

  - The transmission line of the second plate comprises a section printed in a microstrip structure which extends by extending the coplanar section; the microstrip line comprises two layers of conductive material which are printed on the upper face of the plate, on either side of the ribbon, and which are electrically connected to the fore ground plane by needles of conductive material which pass through the platinum, so as to form additional ground planes which extend the first ground plane; - the adaptation section is printed on the upper face of the plate; each part of the second ground plane is electrically connected to an additional ground plane of the microstrip line; the ribbon of the first section and the track of the second section are two zones of the same layer of conductive material and each part of the second ground plane and the associated additional ground plane are two zones of the same layer of conductive material ; the edge of a part of the second ground plane, extending opposite the track, comprises a first segment which extends the associated edge of the associated additional ground plane, approaching the opposite edge - opposite the runway.

  The invention also provides a portable electronic device, in particular a portable radiotelephone, comprising at least two electronic boards connected in an arrangement according to any one of the preceding claims, characterized in that the boards are elements of an antenna for the emission and / or reception of electromagnetic waves, and the plates are interposed between: - at least one electronic element for processing electromagnetic waves which is connected to the wave transmission line of the first plate; and a generally planar radiating element for transmitting and / or receiving electromagnetic waves which is connected to the wave transmission line of the second plate.

  According to other characteristics of the invention: the electronic device comprises at least one electronic circuit which is printed in two parts, each part being printed on one of the plates, and the two parts of the printed circuit being connected to each other through the connector; - The radiating element and the wave transmission line of the second plate form layers of conductive material printed on the same support; - The antenna comprises several electronic elements for its operation according to different transmission and / or reception modes, and in that each plate comprises a transmission line associated with each of the electronic elements; - the support of the second plate is a flexible support.

  Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended figures 1o among which: - Figure 1 is a schematic representation from above of two electronic modules which are interconnected via a coaxial cable, in accordance with the teachings of the prior art; - Figure 2 is a view similar to that of Figure 1, showing two electronic circuits connected together via a ZIF or LIF connector in an arrangement according to the teachings of the invention; FIG. 2a is a detail on a larger scale of the adaptation section of the first module; - Figure 3 is a bottom view of the arrangement shown in Figure 2; - Figure 4 is a vertical longitudinal section along line 4-4 of the arrangement shown in Figure 2; and - Figure 5 is a view similar to that of Figure 2, in which the two electronic circuits comprise several wave transmission lines arranged in parallel.

  For the description of the invention, the vertical, longitudinal and transverse orientations 30 will be adopted, without limitation, according to the reference V, L, T indicated in the figures.

  We will also adopt the orientation from upstream to downstream as being the longitudinal direction and from left to right, referring to FIG. 2.

  In the description which follows, identical, similar or analogous elements will be designated by the same reference numbers.

  FIG. 2 shows an arrangement of two electronic modules, or electronic plates, 10, 14 which are interconnected by means of a connector 36 of the type which comprises a transverse alignment of longitudinal pins 52.

  According to a preferred embodiment, the connector 36 is a connector of the type with zero insertion force, commonly called the ZIF connector, however, the connector 36 can be of any other type such as for example a connector with low insertion force. , commonly called LIF connector (for Low Insertion Force).

  The two modules 10, 14 are two elements of the antenna 15 of a portable radiotelephone which has the function of transmitting and receiving electromagnetic waves.

  This antenna further comprises several electronic components (not shown) for processing electromagnetic waves, which are connected to the upstream end 10a of the first module 10, and a generally planar radiating element (not shown) by which the electromagnetic waves are emitted. or received, which is connected to the downstream end 14b of the second module.

  The first module 10 comprises a support made of insulating material 38 which carries a printed circuit 12 forming a line for transmitting electromagnetic waves, which comprises a first section 48 which extends from the upstream end 10a of the first module 10.

  All of the electronic components are arranged on an upper face of the associated electronic circuit. This is why the first section 48 is printed according to a so-called microstrip structure.

  As shown in FIGS. 2 to 4, the microstrip section 48 comprises a ribbon 40 of conductive material which is printed on the upper face 38s of the support 38, and a layer of conductive material 42 forming a first ground plane, which is printed on the underside 38i of the support 38.

  The microstrip section 48 also comprises two layers 5 of conductive material 44 which are printed on the upper face 38s of the support 38, on either side of the ribbon 40, so as to form two additional ground planes, which are connected to the first ground plane 42, to extend it, by means of needles 46 of conductive material which pass through the insulating support 38.

  The two additional ground planes 44 are printed on the upper face 38s of the support 38 so that the microstrip section 48 has the properties of a microstrip line, in particular an impedance of 50 ohms, this is why the line of transmission is commonly called "50 ohm line". For this, the distance "dl" between the two additional ground planes 44 and the ribbon 40 is greater than the distance "d2" between the ribbon 40 and the first ground plane 42.

  The printed circuit 12 also includes a contact area 20 which is printed on the upper face 38s of the support 38, at the level of the downstream end 10b of the first module 10, and it comprises several longitudinal strips of conductive material (not shown). electrically isolated from each other, which are transversely aligned, and which are electrically connected either to the ribbon 40 or to the additional ground planes 44. It is via this contact zone 50 that the printed circuit 12 is connected to connector 36.

  The connector 36 is of known structure, and it mainly comprises an alignment of longitudinal pins 52. The connector 36 is connected to the printed circuit 12 via the contact zone 50, so that each pin 52 is connected to a single longitudinal strip of conductive material of the contact area 50, thus a pin 52 is connected either to the ribbon 40 or to one of the additional ground planes 44.

  As mentioned above, the electromagnetic field formed in the connector 36 is of generally transverse orientation, while the electromagnetic field formed in the microstrip section 48 is of generally vertical orientation. This difference in orientation between the two electromagnetic fields causes a significant loss of the power of the transmitted electromagnetic waves.

  To reduce these transmitted power losses due to the difference in orientation of the two electromagnetic fields, and in accordance with the invention, the printed circuit 12 includes an adaptation section 54 which is arranged between the microstrip section 48 and the area of contact 50.

  The purpose of this adaptation section 54 is to modify the orientation of the electromagnetic field transmitted by the printed circuit 12 so that at the contact area 50, it is parallel to the orientation of the electromagnetic field in the connector 36 , that is to say generally transverse orientation, without causing power losses during this modification.

  According to a preferred embodiment of the invention, the adaptation section 54 is printed on the upper face 38i of the support 38 according to a structure called "coplanar". According to this structure, the adaptation section 54 comprises a central track 56 of conductive material and two layers 58 of conductive material each forming a part of a second ground plane, which are arranged on either side of the track central 56, on the upper face 38s of the support 38.

  The adaptation section 54 also includes two layers of conductive material 60 printed on the underside 38i of the support 38, which also form an extension of the ground circuit.

  So that the adaptation section 54 has the properties of the coplanar structure, the extensions 60 of the second ground plane 58 are printed on the underside 38i of the support 38 so that no layer of conductive material 5 is present below of the central track 56. in addition, the extensions 60 are electrically connected to the layers of conductive material forming the second ground plane 58 by means of needles of conductive material 46 which pass through the support 38.

  Each layer of conductive material forming the first and the second ground plane of the printed circuit 12, and their respective extensions, which are printed on the same face 38s, 38i of the support are electrically connected to each other.

  Thus, the first ground plane 42 is electrically connected 15 to the two extensions 60 of the second ground plane 58, and each additional ground plane 44 of the microstrip section 48, which is arranged on one side of the ribbon 40, is electrically connected to the part of the second ground plane 58 arranged on the same side with respect to the central strip 56.

  In addition, according to a preferred embodiment of the invention, the first ground plane 42 and the two extensions 60 are zones of the same layer of conductive material which is printed on the underside 38i of the support 38, and each additional ground plane 44 and the part of the second associated ground plane 58 are two zones of the same layer of conductive material printed on the upper face 38s of the support 38.

  Likewise, the tape 40 and the central track 56 are electrically connected together, and according to a preferred embodiment of the invention, the tape 40 and the central track 56 are two zones of the same layer of material. driver.

  It is known that the relative dimensions between a circuit 54 printed in a coplanar structure and a circuit 48 printed in a microstrip structure are such that the distance "d3" between each part 60 of the second ground plane and the central track 56 is very less than the distance "dl" between the ribbon 40 and the additional ground planes 44.

  It is also known that the width of the central track 56 is greater than the width of the tape 40.

  These dimensions "dl", "d3", and the widths of the tape 40 and of the central track 56 are calculated as a function of the thickness of the support 38, and of the thickness of the layers of conductive material on the upper and lower faces. 38s and 38i of the support 38 so as to obtain, for each of the microstrip and coplanar structures, a characteristic impedance as close as possible to 50 Ohms.

  The significant difference between the two distances "dl" and "d3" can also be the source of losses in the transmitted power 15, at the level of the transition between the microstrip section 48 and the coplanar adaptation section 54.

  This is why, according to another aspect of the invention, the coplanar adaptation section 54 comprises a transition section 62 in which the distance "d", between the edge 58a of a part of the second ground plane 58 , which is facing the central track 56, and the edge 56a facing the central track 56, decreases from the transition zone between the microstrip section 48 and the adaptation section 54 , for which the distance "d" is equal to the distance "dl", to an intermediate zone 25 of the adaptation section 54 for which the distance "d" is equal to the distance "d3".

  There is shown in the figures an embodiment of this transition section 62 according to which the distance "d" varies continuously and proportionally as a function of the longitudinal dimension with respect to the transition zone between the microstrip section 48 and the section d adaptation 54, that is to say that the edges 58a of each part of the second ground plane 58 and the edges 56a facing the central track 56 are rectilinear, and inclined relative to the longitudinal direction .

  However, it will be understood that the invention is not limited to this embodiment, and that the variation of the distance "d" may be different, and / or that the edges 58a and 56a may not be straight.

  The second module 14 includes an additional printed circuit 16 which extends the printed circuit 12 of the first module 10, in particular to extend its ground circuit, in order to increase the performance of the antenna.

  Thus, the additional printed circuit 16 includes a supply conductive element 22 which is electrically connected to the supply conductive element of the printed circuit 12 of the first module 10 formed by the central track 56 and the ribbon 40, via associated pins 52 of the connector 36, and a conductive element 24 forming the extension of the ground plane of the printed circuit 12, which is electrically connected to the ground plane of the printed circuit 12 by means of associated pins 52 of the connector 36.

  The additional printed circuit 16 includes a contact area 20 which extends in line with the connector 36, and which is of similar structure to that of the contact area 50 of the first module 10, that is to say that it comprises an alignment of longitudinal strips of conductive material, so that each pin 52 of the connector 36 is connected to a strip of material.

  In addition, the longitudinal strips of the contact zone 64 of the second module 14 are arranged transversely so that the same pin 52 of the connector 36 is connected at each of its ends to the ground plane of the first module 30 10 or to the power supply element.

  According to a first aspect of the second module 14, the additional printed circuit 16 comprises a single section 66 which is printed only on the upper face 68s of the support 68 of the second module 14, and according to a coplanar structure and which extends from the area of contact 64 to the downstream end 14b of the second module 14. Thus, this section does not cause any modification of the orientation of the electromagnetic field and therefore it does not cause any loss of the transmitted power, in particular at the level of the transition with the connector 36.

  In addition, printing the additional printed circuit 16 only on the upper face 64s of the support 64 makes it possible to considerably reduce the production costs of the second module 14, in particular because the support 68 does not include 10 needles of conductive material. which are relatively expensive to make.

  According to another aspect of the second module 14, and as shown in FIGS. 2 and 3, the additional printed circuit 16 is produced according to the same structure as the printed circuit 12 is first module 10, that is to say say that it successively comprises a transition section 62, an intermediate section 66 printed in a coplanar structure, and a section 68 printed in a microstrip structure, as described above.

  The structure of the second module 14 can thus be determined as a function of the desired characteristics of the antenna, and it is possible to vary its dimensions as a function of the space available inside the radiotelephone housing, or else as a function of the transmit and / or receive power of the antenna.

  The support 38 of the first module 10 is generally a section of a support on which a large number of electronic components are arranged. Thus, the support 38 is a rigid support which may in particular comprise several layers of conductive material.

  The support 68 of the second module 14 can also be a rigid support, comprising one or more layers of conductive material. However, according to a preferred embodiment of the invention, the support 68 is made of a flexible material, so that it is possible to bend the second module 14 at will, in particular as a function of the space available to the inside the radiotelephone.

  Thus, when the support 68 of the second module is a flexible support and the additional printed circuit 16 is printed only on the upper face of the support, the constraints for determining the support to be used are reduced, in particular as regards the thickness support 68.

  It is then possible to use a support 68 of small thickness, and the mechanical properties of which allow greater deformation.

  In addition, when the portable radiotelephone is of the type comprising two elements articulated with respect to each other, the flexible support 14 can be arranged partly at the level of the articulation between these two elements, all of the electronic elements then being grouped in a single element, generally that which the user holds in his hand, and the radiating element being arranged in the other element.

  Also, according to another embodiment of the invention, the additional printed circuit 16 and the radiating element of the antenna form layers of conductive material which are printed on the same support 64. Thus, it is not necessary to use connection means between the additional printed circuit 16 and the radiating element, which considerably reduces the manufacturing cost of the second module 14.

  FIG. 5 shows an alternative embodiment of the invention according to which the arrangement comprises several wave transmission lines, which here are three in number, and which each comprise a first printed circuit 12a, 12b, 12c and an electronic component 70a, 70b, 70c, arranged on the first module, and an additional printed circuit 16a, 16b, 16c arranged on the second module 14. This arrangement also includes a single connector 36 of the ZIF or LIF type which connects each from the first printed circuits 12a, 12b, 12c to the second associated printed circuit 16a, 16b, 16c.

  The first circuits 12a, 12b, 12c, additional printed circuits 16a, 16b, 16c are produced according to any one of the embodiments described above.

  In addition, depending on the use of the associated wave transmission line, each additional printed circuit 16a, 16b, 16c can be connected either to a radiating element, in which case the transmission line is part of an antenna of the 10 radiotelephone, or the additional printed circuit 16a, 16b, 16c can be connected to another type of electronic component, in which case the transmission line is a part of another radiotelephone circuit.

  The additional printed circuits 16a, 16b, 16c, and the associated electronic components, of each wave transmission line, can be associated with radiating elements which are each capable of operating according to a particular transmission / reception standard, among which may mention the “GSM” standard, the “Bluetooth” standard, the “GPS” standard, the “DECT” standard, etc. Furthermore, according to yet another alternative embodiment of the invention, the radiating element or elements can be produced by printing a layer of conductive material on the support 68 of the second module 14.

  The invention has been described as being applied to the antenna of a portable radio telephone. However, it will be understood that the invention is not limited to this application, and that it can be applied to any other electronic device which comprises two printed circuits connected together by the intermediary of a connector 36 such as described above, and of which at least one of the electronic circuits comprises a transmission line printed in a microstrip structure.

  We can clearly see here the advantage of using a connector 36, since for different printed circuits, only one connector 36 is used, while the coaxial cable technology requires the use of as many cables 26 and pairs of connectors 34 that the radiotelephone comprises antennas operating in different modes.

Claims (15)

  1. Arrangement for electrically connecting two electronic printed circuit boards (10, 14), of the type in which a transmission line for electromagnetic waves (12, 16) is printed on each printed circuit board, at least the transmission line (12) of the first plate (10) being printed according to a microstrip structure, and of the type which comprises a connector (36) comprising a transverse alignment of pins (52) 1o longitudinal which connects the transmission lines (12, 16) of the two plates (10 , 12), characterized in that the first plate (10) has a contact zone (50) arranged in line with the connector (36) and an adaptation section (54) which connects the microstrip line (48) to the 15 contact zone (50), in particular for modifying the orientation of the electromagnetic field between the microstrip line (48) and the contact zone (50).
  2. Arrangement according to the preceding claim, characterized in that the adaptation section (54) is printed according to a coplanar structure.
  3. Arrangement according to any one of the preceding claims, characterized in that the second plate (14) has a contact zone (64) arranged in line with the connector (36), and in that the transmission line (16 ) of the second plate (14) comprises at least one section (66) printed in a coplanar structure which is connected to the contact zone (64).
  4. Arrangement according to the preceding claim, characterized in that the transmission line (16) of the second plate (14) comprises a single section (66) in coplanar structure which is printed on one side (68s) of the second plate (14).
  5. Arrangement according to claim 3, characterized in that the transmission line (16) of the second plate (14) comprises a section (70) printed according to a microstrip structure which extends by extending the coplanar section (66) .
  6. Arrangement according to any one of the preceding claims, in combination with claim 2, of the type in which the microstrip line (48) comprises a ribbon (40) of conductive material printed on an upper face (38s) of the plate. (10) and a layer of conductive material (42), forming a first ground plane, printed on a lower face (38i) 15 of the plate (10), characterized in that the microstrip line (48) comprises two layers of conductive material (44) which are printed on the upper face (38s) of the plate (10), on either side of the ribbon (40), and which are electrically connected to the first ground plane (42) by needles (46) of conductive material which pass through the plate (10), so as to form additional ground planes which extend the first ground plane (42).
  7. Arrangement according to the preceding claim, in combination with claim 2, characterized in that the adaptation section (54) is printed on the upper face of the plate (10).
  8. Arrangement according to the preceding claim, of the type 30 in which the adaptation section (54) comprises a track of conductive material (56) and two layers of conductive material (58), each forming a part of a second plane of ground, arranged on either side of the track (56), characterized in that each part (58) of the second ground plane is electrically connected to an additional ground plane (60) of the microstrip line (54).
  9. Arrangement according to the preceding claim, 5 characterized in that the strip (40) of the first section (48) and the track (56) of the second section (54) are two zones of the same layer of conductive material and in this that each part (58) of the second ground plane and the associated additional ground plane (60) are two zones of the same layer of conductive material.
  10. Arrangement according to one of claims 8 or 9, characterized in that the edge (58a) of a part (58) of the second ground plane, extending opposite the track (56) , comprises a first segment which extends the associated edge of the associated additional ground plane (46), approaching the edge (56a) facing the track (56).
  11. portable electronic device, in particular a portable radiotelephone, comprising at least two electronic boards (10, 14) connected in an arrangement according to any one of the preceding claims, characterized in that the boards (10, 14) are elements of an antenna for transmitting and / or receiving electromagnetic waves, and in that the plates (10, 14) are interposed between: - at least one electronic element for processing electromagnetic waves which is connected to the wave transmission line (12) of the first plate (10); and - a generally planar radiating element for the emission 30 and / or the reception of electromagnetic waves which is connected to the wave transmission line (16) of the second plate (14).
  12. Electronic device according to the preceding claim, characterized in that it comprises at least one electronic circuit which is printed in two parts, each part being printed on one of the plates (10, 14), and the two parts of the printed circuit. being interconnected via the connector (36).
  13. Electronic device according to one of claims 11 or 12, characterized in that the radiating element and the wave transmission line (16) of the second plate (14) form layers of conductive material printed on a same support.
  14. Electronic device according to any one of claims 11 to 13, characterized in that the antenna comprises several electronic elements (70a, 70b, 70c) for its operation according to different transmission and / or reception modes, and in that each plate (10, 14) comprises a transmission line (12a, 12b, 12c, 16a, 16b, 16c) associated with each of the electronic elements (70a, 70b, 70c).
  15. Electronic device according to the preceding claim, characterized in that the support (68) of the second plate (14) is a flexible support.
FR0303458A 2003-03-21 2003-03-21 Arrangement for connecting two electronic plates with a zif or lif connector, a coplanar structure string and a micro-structure structure Expired - Fee Related FR2852743B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0303458A FR2852743B1 (en) 2003-03-21 2003-03-21 Arrangement for connecting two electronic plates with a zif or lif connector, a coplanar structure string and a micro-structure structure

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0303458A FR2852743B1 (en) 2003-03-21 2003-03-21 Arrangement for connecting two electronic plates with a zif or lif connector, a coplanar structure string and a micro-structure structure
DE200410014380 DE102004014380A1 (en) 2003-03-21 2004-03-17 Arrangement for connecting two electronic boards by means of a ZIF or LIF connector, a section having a coplanar structure and a section having a microstrip structure
CNA2004100301679A CN1538568A (en) 2003-03-21 2004-03-19 Arrangement for connecting two circuit boards by connector, coplanar structural section and microstrip structural section

Publications (2)

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FR2852743A1 true FR2852743A1 (en) 2004-09-24
FR2852743B1 FR2852743B1 (en) 2007-01-12

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FR0303458A Expired - Fee Related FR2852743B1 (en) 2003-03-21 2003-03-21 Arrangement for connecting two electronic plates with a zif or lif connector, a coplanar structure string and a micro-structure structure

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Country Link
CN (1) CN1538568A (en)
DE (1) DE102004014380A1 (en)
FR (1) FR2852743B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005049721A1 (en) * 2005-10-14 2007-04-26 Borg Instruments Ag Display device for a motor vehicle with a first and / or a second light guide region having pivotable pointer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573670A (en) * 1969-03-21 1971-04-06 Ibm High-speed impedance-compensated circuits
US5093640A (en) * 1989-09-29 1992-03-03 Hewlett-Packard Company Microstrip structure having contact pad compensation
US5675302A (en) * 1995-06-02 1997-10-07 Hughes Electronics Microwave compression interconnect using dielectric filled three-wire line with compressible conductors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573670A (en) * 1969-03-21 1971-04-06 Ibm High-speed impedance-compensated circuits
US5093640A (en) * 1989-09-29 1992-03-03 Hewlett-Packard Company Microstrip structure having contact pad compensation
US5675302A (en) * 1995-06-02 1997-10-07 Hughes Electronics Microwave compression interconnect using dielectric filled three-wire line with compressible conductors

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DE102004014380A1 (en) 2004-09-30
FR2852743B1 (en) 2007-01-12
CN1538568A (en) 2004-10-20

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